Django之ORM_语言综合

概述ORM ORM即Object Relational Mapping（对象关系映射）对象关系映射（英语：(Object Relational Mapping，简称ORM，或O/RM，或O/R mappi

<div data-md-url="https://i.cnblogs.com/Editposts.aspx?postID=9911526">
<h1 ID="orm" >ORM
<blockquote >
<p >ORM即Object Relational MapPing（对象关系映射）对象关系映射（英语：(Object Relational MapPing，简称ORM，或O/RM，或O/R mapPing），是一种程序技术，用于实现面向对象编程语言里不同类型系统的数据之间的转换。从效果上说，它其实是创建了一个可在编程语言里使用的—“虚拟对象数据库”。

: {        : ,: os.path.join(BASE_DIR,),}}

: {      : ,:,: ,: ,: ,: ,}}

 pyMysqL pyMysqL.install_as_MysqLdb()

 :    name=models.CharFIEld(max_length=)    num=models.IntegerFIEld()    school=models.ForeignKey(school,on_delete=models.CASCADE)    teacher=models.ManyToManyFIEld(teacher)     :         self.name

 :    name = models.CharFIEld(max_length=)     :         self.name<span ><span  >class <span  >teacher<span  >(models.Model):
name = models.CharFIEld(max_length=<span  >20)
<span  ><span  >def <span  >str<span  >(self):
<span  >return self.name

<p >首先在models.py中简单的创建了三个表，然后需要在当前项目有manage.py文件目录下的cmd或者pycharm中的terminal下执行如下命令来同步数据库：

python manage.py migrate

 blog.models  *

,num=,school=school_obj)或者student.objects.create(**{:,=,=obj

name=<span  >"student1",school=school_obj)
student_obk.save()
或者
student_obj=student()
student_obj.name=<span  >"student1"
student_obj.num=<span  >1
student_obj.school=school_obj


<h6 ID="2-" >2.一对多关系的字段
<p >直接设置外键的ID在student.objects.create中加
)student.objects.create(**{:,:,:obj})
)teacher2=teacher.objects.get(ID=)student1=student.objects.get(ID=)student1.teacher.add(teacher1,teacher2)
,ID__lt=)student1=student.objects.get(ID=)student1.teacher.add(*teacher1)
)[]student1=student.objects.filter(ID__gt=)teacher1.student_set.add(*student1)
)[]student1.teacher.add()
)[].delete()
)[]student1.teacher.clear()student1.teacher.remove()student1.teacher.remove(*List)
)student1.name=student1.save()``
或者
student1=student.objects.filter(<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>=<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;2</span>).update(<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>=<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;"sfencs"</span>)</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;update是<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>set的<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" >方法</a>，可以<a href="https://m.jb51.cc/tag/gengxin/" target="_blank" >更新</a>多行数据。save<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" >方法</a>是将一行的所有字段都重新存储一遍，update<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" >方法</a>只将要改变的字段存储，效率更高。</p><h6 <a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>="2-" https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 20px 0px 10px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-weight: b<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>d; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #777777; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;2.多对多表的字段的<a href="https://www.jb51.cc/tag/xiugai/" target="_blank" >修改</a></h6><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;student_obj.teacher.set([<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;1</span>,<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;2</span>,<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;3</span>])<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-comment" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #766e6b;"&gt;# set里是<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a>列表</span></code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;先<a href="https://www.jb51.cc/tag/shanchu/" target="_blank" >删除</a>，再<a href="https://www.jb51.cc/tag/tianjia/" target="_blank" >添加</a></p><h3 <a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>="4-" https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 20px 0px 10px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-weight: b<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>d; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: black; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 20px; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-b<a href="https://www.jb51.cc/tag/ott/" target="_blank" >ott</a>om: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #aaaaaa;"&gt;4.<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a></h3><h6 <a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>="1-" https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 20px 0px 10px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-weight: b<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>d; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #777777; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;1.<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>的有关<a href="https://www.jb51.cc/tag/hanshu/" target="_blank" >函数</a></h6><<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 1.2em 0px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 2em; <a href="https://m.jb51.cc/tag/List/" target="_blank" >List</a>-style-type: square; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;filter(**<a href="https://www.jb51.cc/tag/kwargs/" target="_blank" >kwargs</a>)筛选</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;all()所有结果</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;get(**<a href="https://www.jb51.cc/tag/kwargs/" target="_blank" >kwargs</a>)得到<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a>结果，如果结果多于<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a>或没有都会<a href="https://m.jb51.cc/tag/baocuo/" target="_blank" >报错</a></li></ul><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;如果<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>结果是<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a>结果集，即<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set对象，那么它还有以下<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" >方法</a></p><<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 1.2em 0px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 2em; <a href="https://m.jb51.cc/tag/List/" target="_blank" >List</a>-style-type: square; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;values(*f<a href="https://m.jb51.cc/tag/IE/" target="_blank" >IE</a>ld): 返回<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a>Value<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set——<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a>特殊的<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set，运行后得到的并不是一系列 model的实例化对象，而是<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a>可迭代的字典序列</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;exclude(**<a href="https://www.jb51.cc/tag/kwargs/" target="_blank" >kwargs</a>): 它包含了与所给筛选<a href="https://m.jb51.cc/tag/tiaojian/" target="_blank" >条件</a>不匹配的对象</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;order_by(*f<a href="https://m.jb51.cc/tag/IE/" target="_blank" >IE</a>ld): 对<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>结果<a href="https://m.jb51.cc/tag/paixu/" target="_blank" >排序</a></li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;reverse(): 对<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>结果反向<a href="https://m.jb51.cc/tag/paixu/" target="_blank" >排序</a></li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>tinct(): 从返回结果中剔除重复纪录</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;values_<a href="https://m.jb51.cc/tag/List/" target="_blank" >List</a>(*f<a href="https://m.jb51.cc/tag/IE/" target="_blank" >IE</a>ld): 它与values()<a href="https://m.jb51.cc/tag/feichang/" target="_blank" >非常</a>相似，它返回的是<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a><a href="https://www.jb51.cc/tag/yuanzu/" target="_blank" >元组</a>序列，values返回的是<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a>字典序列</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;count(): 返回<a href="https://www.jb51.cc/tag/shujuku/" target="_blank" >数据库</a>中匹配<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>(<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set)的对象<a href="https://www.jb51.cc/tag/shuliang/" target="_blank" >数量</a>。</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;f<a href="https://www.jb51.cc/tag/irs/" target="_blank" >irs</a>t(): 返回第一条记录</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;last(): 返回最后一条记录</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;exists(): 如果<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set包含数据，就返回True，否则返回False。</li></ul><h6 <a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>="2-<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>set-" https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 20px 0px 10px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-weight: b<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>d; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #777777; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;2.<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set对象</h6><<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 1.2em 0px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 2em; <a href="https://m.jb51.cc/tag/List/" target="_blank" >List</a>-style-type: square; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>的结果集就是<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a><a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set对象</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set对象就像是<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a>列表，列表存储着<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>出的结果，可以迭代，可以切片</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;Django中<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set对象是惰性的，即你得到<a href="https://m.jb51.cc/tag/zhege/" target="_blank" >这个</a>对象的时候并没有真正的在<a href="https://www.jb51.cc/tag/shujuku/" target="_blank" >数据库</a>中执行<a href="https://m.jb51.cc/tag/SQLyuju/" target="_blank" >SQL语句</a>，只有用到了<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set对象中的数据才会执行<a href="https://m.jb51.cc/tag/SQLyuju/" target="_blank" >SQL语句</a></li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;想判断<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set对象中是否有数据，若写成</li></ul><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-keyword" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #6666ea;"&gt;if</span> obj:</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;仍然会执行<a href="https://m.jb51.cc/tag/SQLyuju/" target="_blank" >SQL语句</a>，若<a href="https://m.jb51.cc/tag/shiyong/" target="_blank" >使用</a></p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-keyword" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #6666ea;"&gt;if</span> obj.exists():</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;就可以避免这种<a href="https://m.jb51.cc/tag/wenti/" target="_blank" >问题</a>。</p><<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 1.2em 0px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 2em; <a href="https://m.jb51.cc/tag/List/" target="_blank" >List</a>-style-type: square; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set对象的<a href="https://m.jb51.cc/tag/shiyong/" target="_blank" >使用</a>是有cache缓存的，即遍历第二次<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set对象的时候数据是从缓存中拿的，不会执行<a href="https://m.jb51.cc/tag/SQLyuju/" target="_blank" >SQL语句</a></li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;如果<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set对象数据量特别大，遍历时为了避免占用大量cache空间，可以将<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set对象转换成<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a>迭代器</li></ul><h6 <a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>="3-" https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 20px 0px 10px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-weight: b<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>d; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #777777; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;3.基础查找</h6><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;得到对象后，查找字段</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;student1=student.objects.filter(scho<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>_<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>=<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;1</span>)[<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;0</span>]print(student1.num)</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;拿时外键对象的字段</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;student1 = student.objects.filter(<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>=<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;2</span>)[<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;0</span>]print(student1.scho<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>.<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>)</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;拿多对多关系的字段因为是多对多关系，得到的会是<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a><a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set对象</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;student1=student.objects.filter(<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>=<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;2</span>)[<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;0</span>]print(student1.teacher.values(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>'</span>))</code></pre><h6 <a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>="4-__-" https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 20px 0px 10px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-weight: b<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>d; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #777777; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;4.<a href="https://m.jb51.cc/tag/shiyong/" target="_blank" >使用</a>’__’<a href="https://m.jb51.cc/tag/jinxing/" target="_blank" >进行</a>的查找</h6><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;一对多scho<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>_<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>为外键对象的字段scho<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>为student表中<a href="https://m.jb51.cc/tag/shezhi/" target="_blank" >设置</a>的外键字段</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;student1=student.objects.filter(<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>=<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;2</span>).values(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'scho<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>__<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>'</span>)print(student1)</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;多对多和一对多的<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>方式一样teacher为student表中<a href="https://m.jb51.cc/tag/shezhi/" target="_blank" >设置</a>的外键字段</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;student1=student.objects.filter(<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>=<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;2</span>).values(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'teacher__<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>'</span>)print(student1)</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;反向一对多student__<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>中的student为表名</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>t=scho<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>.objects.filter(student__<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>=<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'student1'</span>).values(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>'</span>)print(res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>t)</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;反向多对多也和反向多对多一样</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>t=teacher.objects.filter(student__<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>=<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;2</span>).values(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>'</span>)print(res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>t)</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;其他<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a><a href="https://m.jb51.cc/tag/tiaojian/" target="_blank" >条件</a></p><<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 1.2em 0px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 2em; <a href="https://m.jb51.cc/tag/List/" target="_blank" >List</a>-style-type: square; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>__lt=3 表示<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>小于3</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>__gt=1 表示<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>大于1</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>__in=[1,2,3] 表示<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>在列表中</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>__contains=”fenc” 表示<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>中包含fenc</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>__icontains=”ven” 表示不区分大小写的包含</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>__range=[1,3] 表示<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>在1到3之间，<a href="https://www.jb51.cc/tag/baokuo/" target="_blank" >包括</a>1,3</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>__startswith=’cs’ 表示以cs开头的</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>__endswith=’cs’ 表示以cs结尾的</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>__istartswith 不区分大小写</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>__<a href="https://m.jb51.cc/tag/IE/" target="_blank" >IE</a>ndswith 不区分大小写</li><<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a> https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0.5em 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;等等</li></ul><h6 <a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>="5-aggregate" https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 20px 0px 10px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-weight: b<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>d; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #777777; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;5.聚合<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>aggregate</h6><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;聚合<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>是对<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set对象<a href="https://m.jb51.cc/tag/jinxing/" target="_blank" >进行</a>计算得到<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a>结果值作为字典中的值放到<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a>字典中<a href="https://m.jb51.cc/tag/zheli/" target="_blank" >这里</a>先引入一些聚合<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" >方法</a></p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-keyword" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #6666ea;"&gt;from</span> django.db.models <span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-keyword" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #6666ea;"&gt;<a href="https://m.jb51.cc/tag/import/" target="_blank" >import</a></span> Avg,Min,Sum,Max</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;举例：</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>t=student.objects.all().aggregate(Max(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'num'</span>))print(res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>t)</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;得到的是<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a>字典：{‘num__max’: 3}若你想给<a href="https://m.jb51.cc/tag/zhege/" target="_blank" >这个</a>字典的key换<a href="https://www.jb51.cc/tag/yige/" target="_blank" >一个</a>名字，可以<a href="https://m.jb51.cc/tag/shiyong/" target="_blank" >使用</a>：</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>t=student.objects.all().aggregate(new_<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>=Max(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'num'</span>))</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;<a href="https://www.jb51.cc/tag/shuchu/" target="_blank" >输出</a>：{‘new_<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>’: 3}也可以同时<a href="https://m.jb51.cc/tag/jinxing/" target="_blank" >进行</a>多个聚合<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a></p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>t=student.objects.all().aggregate(Avg(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'num'</span>),Min(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'num'</span>),new_<a href="https://m.jb51.cc/tag/name/" target="_blank" >name</a>=Max(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'num'</span>))</code></pre><h6 <a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>="6-annotate" https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 20px 0px 10px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-weight: b<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>d; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #777777; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;6.分组<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>annotate</h6><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;分组<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>就像是<a href="https://m.jb51.cc/tag/SQLyuju/" target="_blank" >SQL语句</a>中的group by可以如下<a href="https://m.jb51.cc/tag/shiyong/" target="_blank" >使用</a>，即以scho<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>_<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>分组，计算每组的max（num）</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>t=student.objects.values(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'scho<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>_<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>'</span>).annotate(Max(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'num'</span>))</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;也可以对<a href="https://m.jb51.cc/tag/query/" target="_blank" >query</a>Set对象<a href="https://m.jb51.cc/tag/shiyong/" target="_blank" >使用</a>在<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>得出的结果集中<a href="https://m.jb51.cc/tag/jinxing/" target="_blank" >进行</a>分组</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>t=student.objects.filter(scho<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>_<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>__lt=<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;2</span>).values(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'scho<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>_<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>'</span>).annotate(Max(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'num'</span>))</code></pre><h6 <a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>="7-f-" https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 20px 0px 10px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-weight: b<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>d; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #777777; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;7.F<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a></h6><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;执行F<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>前还得先引入</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-keyword" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #6666ea;"&gt;from</span> django.db.models <span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-keyword" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #6666ea;"&gt;<a href="https://m.jb51.cc/tag/import/" target="_blank" >import</a></span> F</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;F<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>可以将对象中的值作为变量<a href="https://m.jb51.cc/tag/shiyong/" target="_blank" >使用</a>，例如：</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>t=student.objects.filter(<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>__gt=F(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'scho<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>_<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>'</span>))</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;或者</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;res<a href="https://m.jb51.cc/tag/ul/" target="_blank" >ul</a>t=student.objects.update(num=F(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'scho<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>_<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>'</span>)+<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;1</span>)</code></pre><h6 <a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>="8-q-" https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 20px 0px 10px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-weight: b<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>d; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #777777; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;8.Q<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a></h6><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;惯例先引入</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;  <span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-keyword" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #6666ea;"&gt;from</span> django.db.models <span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-keyword" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #6666ea;"&gt;<a href="https://m.jb51.cc/tag/import/" target="_blank" >import</a></span> Q</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;Q<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>是应用在<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a><a href="https://m.jb51.cc/tag/tiaojian/" target="_blank" >条件</a>上的。在普通的<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>当中，且可以用逗号‘，’表示，可是如果<a href="https://m.jb51.cc/tag/women/" target="_blank" >我们</a>想<a href="https://m.jb51.cc/tag/shiyong/" target="_blank" >使用</a>或的关系怎么办，<a href="https://m.jb51.cc/tag/shiyong/" target="_blank" >使用</a>Q来完成它</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;student1=student.objects.filter(Q(num=<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;1</span>) | Q(scho<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>_<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>=<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;1</span>))</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;相当于用Q将<a href="https://m.jb51.cc/tag/tiaojian/" target="_blank" >条件</a>封装，在Q对象之间<a href="https://m.jb51.cc/tag/shiyong/" target="_blank" >使用</a>&amp;或者|或者~如果想将普通发<a href="https://www.jb51.cc/tag/guanjianzicanshu/" target="_blank" >关键字参数</a><a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>与Q<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>一起<a href="https://m.jb51.cc/tag/shiyong/" target="_blank" >使用</a>，必须将<a href="https://www.jb51.cc/tag/guanjianzicanshu/" target="_blank" >关键字参数</a><a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>放到Q的后边</p><h6 <a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>="9-extra" https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 20px 0px 10px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-weight: b<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>d; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #777777; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;9.扩展<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>extra</h6><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;Django 的<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>语法难以简练地表达复杂的 WHERE 子句，于是<a href="https://m.jb51.cc/tag/shiyong/" target="_blank" >使用</a>扩展<a href="https://www.jb51.cc/tag/chaxun/" target="_blank" >查询</a>extra，其原理相当于给<a href="https://m.jb51.cc/tag/SQLyuju/" target="_blank" >SQL语句</a>中<a href="https://www.jb51.cc/tag/tianjia/" target="_blank" >添加</a>子语句extra(select=None,where=None,p<a href="https://www.jb51.cc/tag/ara/" target="_blank" >ara</a>ms=None,<a href="https://m.jb51.cc/tag/table/" target="_blank" >table</a>s=None,order_by=None,select_p<a href="https://www.jb51.cc/tag/ara/" target="_blank" >ara</a>ms=None)这些<a href="https://m.jb51.cc/tag/canshu/" target="_blank" >参数</a>都是可写可不写的简单举例：直接暴力上<a href="https://www.jb51.cc/tag/zhongwen/" target="_blank" >中文</a>了</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;student1=student.objects.extra(select={<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'是否大于2'</span>:<span  &gt;'num>2'</span>})print(student1.values(<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'是否大于2'</span>)[<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;0</span>][<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'是否大于2'</span>])</code></pre><p &gt;SQL语句其实执行的是SELECT (num>2) AS <code https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px 0.3em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre-wrap; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #eaeaea; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: in<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne;"&gt;是否大于2</code> FROM `blog_student可以为select传递<a href="https://m.jb51.cc/tag/canshu/" target="_blank" >参数</a></p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;student1=student.objects.extra(select=({<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'是否大于2'</span>:<span  &gt;'num><a href="https://www.jb51.cc/tag/s/" target="_blank" >%s</a>'</span>}),select_p<a href="https://www.jb51.cc/tag/ara/" target="_blank" >ara</a>ms = (<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'2'</span>,))</code></pre><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;可以<a href="https://m.jb51.cc/tag/paixu/" target="_blank" >排序</a>加‘-’为从大到小，不加为从小到大</p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,))student1=student1.extra(order_by=[<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'-是否大于2'</span>])</code></pre><p &gt;语句中会添加SELECT (num>’2’) AS <code https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px 0.3em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre-wrap; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #eaeaea; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: in<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne;"&gt;是否大于2</code> FROM <code https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px 0.3em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre-wrap; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #eaeaea; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: in<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne;"&gt;blog_student</code> ORDER BY <code https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px 0.3em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre-wrap; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #eaeaea; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: in<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne;"&gt;是否大于2</code> DESC也可以<a href="https://m.jb51.cc/tag/shezhi/" target="_blank" >设置</a>where<a href="https://m.jb51.cc/tag/tiaojian/" target="_blank" >条件</a>,并且给where<a href="https://m.jb51.cc/tag/shezhi/" target="_blank" >设置</a><a href="https://m.jb51.cc/tag/canshu/" target="_blank" >参数</a></p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,),where=[<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a><<a href="https://www.jb51.cc/tag/s/" target="_blank" >%s</a>'</span>],p<a href="https://www.jb51.cc/tag/ara/" target="_blank" >ara</a>ms=[<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'4'</span>])</code></pre><p &gt;SQL语句为SELECT (num>’2’) AS <code https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px 0.3em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre-wrap; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #eaeaea; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: in<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne;"&gt;blog_student</code> WHERE (<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a><’4’) ORDER BY <code https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px 0.3em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre-wrap; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #eaeaea; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: in<a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne;"&gt;是否大于2</code> DESC</p><h6 <a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>="10-<a href="https://www.jb51.cc/tag/sql/" target="_blank" >sql</a>-" https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 20px 0px 10px; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0px; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-weight: b<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>d; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #777777; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px;"&gt;10.日志查看对应执行的<a href="https://m.jb51.cc/tag/SQLyuju/" target="_blank" >SQL语句</a></h6><p https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0px 1.2em !<a href="https://m.jb51.cc/tag/important/" target="_blank" >important</a>; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 16px; <a href="https://m.jb51.cc/tag/li/" target="_blank" >li</a>ne-height: 1.75em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-right: 0.5em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>-@R_<a href="https://www.jb51.cc/tag/502/" target="_blank" >502</a>_6823@: 0.5em;"&gt;在setting.py中<a href="https://www.jb51.cc/tag/jiashang/" target="_blank" >加上</a>下边的<a href="https://www.jb51.cc/tag/daima/" target="_blank" >代码</a></p><pre><code https://m.jb51.cc/tag/Js/" target="_blank" >Js</a> language-python" https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-size: 0.85em; <a href="https://m.jb51.cc/tag/Font/" target="_blank" >Font</a>-family: Cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>as,monospace; <a href="https://m.jb51.cc/tag/margin/" target="_blank" >margin</a>: 0px 0.15em; <a href="https://m.jb51.cc/tag/padding/" target="_blank" >padding</a>: 0.5em; <a href="https://m.jb51.cc/tag/whitespace/" target="_blank" >white-space</a>: pre; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>: <a href="https://m.jb51.cc/tag/1px/" target="_blank" >1px</a> s<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a><a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a> #cccccc; background-<a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #f8f8f8; <a href="https://m.jb51.cc/tag/border/" target="_blank" >border</a>-radius: 3px; <a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>play: block; overflow: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; overflow-x: <a href="https://m.jb51.cc/tag/auto/" target="_blank" >auto</a>; background: #f1efee; <a href="https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #68615e; text-size-adjust: none;"&gt;LOGGING = {    <span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'version'</span>: <span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-number" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #df5320;"&gt;1</span>,<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'<a href="https://www.jb51.cc/tag/dis/" target="_blank" >dis</a>able_existing_loggers'</span>: <span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-keyword" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #6666ea;"&gt;False</span>,<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'handlers'</span>: {        <span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>e'</span>:{            <span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'level'</span>:<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'DE<a href="https://m.jb51.cc/tag/BUG/" target="_blank" >BUG</a>'</span>,<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'class'</span>:<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'logging.StreamHandler'</span>,},<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'loggers'</span>: {        <span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'django.db.backends'</span>: {            <span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'handlers'</span>: [<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'cons<a href="https://m.jb51.cc/tag/ol/" target="_blank" >ol</a>e'</span>],<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'propagate'</span>: <span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-keyword" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #6666ea;"&gt;True</span>,<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'level'</span>:<span https://m.jb51.cc/tag/Js/" target="_blank" >Js</a>-string" https://m.jb51.cc/tag/color/" target="_blank" >color</a>: #5ab738;"&gt;'DE<a href="https://m.jb51.cc/tag/BUG/" target="_blank" >BUG</a>'</span>,}}LOGGING</code></pre><<a href="https://m.jb51.cc/tag/div/" target="_blank" >div</a> https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>th: 0; max-height: 0; max-w<a href="https://m.jb51.cc/tag/ID/" target="_blank" >ID</a>th: 0; overflow: h<a href="https://m.jb51.cc/tag/ID/" target="_blank" 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          总结       以上是内存溢出为你收集整理的Django之ORM全部内容，希望文章能够帮你解决Django之ORM所遇到的程序开发问题。
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Django之ORM

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