Android中对数据库进行条件查询

android读取数据库可以使用sqlite一些api进行读取，实例如下：

/**

*

查找一条数据

*

@param

uid

*/

public

user

find(integer

uid){

sqlitedatabase

db=dbopenhelper.getreadabledatabase()

//创建数据库辅助类

cursor

cursor

=db.rawquery("select

*

from

user

where

uid=?",

new

string[]{uid.tostring()})

//创建一个游标

if(cursor.movetofirst()){

//循环遍历查找数组

int

uid2=cursor.getint(cursor.getcolumnindex("uid"))

string

uname=cursor.getstring(cursor.getcolumnindex("uname"))

string

uaddress=cursor.getstring(cursor.getcolumnindex("uaddress"))

user

user=new

user()

user.setuid(uid2)

user.setuname(uname)

user.setuaddress(uaddress)

return

user

}

cursor.close()

return

null

}

SQLiteDatabase 给我提供的方法很不实用,还是建议楼主自己写sql语句,参数想怎么传都可以\x0d\x0a例如:Cursor c = db.rawQuery("select * from user where username=? and password = ?",\x0d\x0anew Stirng[]{"用户名","密码"})\x0d\x0a\x0d\x0a如果你非要调用SQLiteDatabase的query方法,那可以这样\x0d\x0adb.query("表名", new String[]{"字段1，字段2"}, "条件1=? and 条件2=?", new String[]{"条件1的值，条件2的值"},null,null,null)

SQLiteDatabase db=dbHelper.getWritableDatabase()

db.delete("record","pulse=?and dia_pre=?",new String[]{record.get_pulse(),record.get_dia_pre()})//删除所有pulse等于给定值并且dia_pre等于给定值的记录

Cursor cursor=db.query("record",null,"sys_pre&gt?and dia_pre&lt?",new String[]{"120","85"},null,null,null)//多条件查询记得String是数组

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