MyBtis(七)逆向工程

MyBtis(七)逆向工程 逆向工程

MyBatis Generator
简称MBG，是一个专门为MyBatis框架使用者定制的代码生成器，可以快速的根据表生成对应的映射文件，接口，以及bean类。支持基本的增删改查，以及QBC风格的条件查询。但是表连接、存储过程等这些复杂sql的定义需要我们手工编写。
官方文档地址
http://www.mybatis.org/generator/
官方工程地址
https://github.com/mybatis/generator/releases

MBG使用实 *** ：
创建工程

• 1、添加依赖

    
    
        org.mybatis.generator
        mybatis-generator-core
        1.3.6
    
    
        org.mybatis.generator
        mybatis-generator-maven-plugin
        1.4.0
    

    
    
        log4j
        log4j
        1.2.17
    
    
    
        org.mybatis
        mybatis
        3.4.1
    

    
    
        org.mybatis.generator
        mybatis-generator-core
        1.3.2
    
    
    
        mysql
        mysql-connector-java
        8.0.23
    
    
    
        com.oracle.database.jdbc
        ojdbc6
        11.2.0.4
    
    
    
        org.slf4j
        slf4j-api
        1.7.32
    
    
    
        org.slf4j
        slf4j-log4j12
        1.7.32
        test
    



    
        
            src/main/java
            
                ***.xml
            
            false
        
    

• 2、配置mybatis文件

• 3、编写MBG的配置文件（重要几处配置）

• jdbcConnection配置数据库连接信息
• javaModelGenerator配置javaBean的生成策略
• sqlMapGenerator 配置sql映射文件生成策略
• javaClientGenerator配置Mapper接口的生成策略
• table 配置要逆向解析的数据表
   tableName：表名
   domainObjectName：对应的javaBean名

mbg.xml

注意：
Context标签
targetRuntime=“MyBatis3“可以生成带条件的增删改查
targetRuntime=“MyBatis3Simple“可以生成基本的增删改查
如果再次生成，建议将之前生成的数据删除，避免xml向后追加内容出现的问题。

• 4、运行代码生成器生成代码

public class MBGTest {
    public static void main(String[] args) {

        try {
            List warnings = new ArrayList();
            File configFile = new File("mbg.xml");
            ConfigurationParser cp = new ConfigurationParser(warnings);
            Configuration config = cp.parseConfiguration(configFile);
            DefaultShellCallback callback = new DefaultShellCallback(true);
            MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,callback, warnings);
            myBatisGenerator.generate(null);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (XMLParserException e) {
            e.printStackTrace();
        } catch (InvalidConfigurationException e) {
            e.printStackTrace();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

运行结果：

DEBUG 10-18 16:25:46,593 Retrieving column information for table "tbl_dept"  (Log4jImpl.java:46) 
DEBUG 10-18 16:25:46,744 Found column "id", data type 4, in table "test..tbl_dept"  (Log4jImpl.java:46) 
DEBUG 10-18 16:25:46,745 Found column "dept_name", data type 12, in table "test..tbl_dept"  (Log4jImpl.java:46) 
DEBUG 10-18 16:25:46,794 Retrieving column information for table "tbl_employee"  (Log4jImpl.java:46) 
DEBUG 10-18 16:25:46,828 Found column "id", data type 4, in table "test..tbl_employee"  (Log4jImpl.java:46) 
DEBUG 10-18 16:25:46,828 Found column "last_name", data type 12, in table "test..tbl_employee"  (Log4jImpl.java:46) 
DEBUG 10-18 16:25:46,828 Found column "gender", data type 1, in table "test..tbl_employee"  (Log4jImpl.java:46) 
DEBUG 10-18 16:25:46,829 Found column "email", data type 12, in table "test..tbl_employee"  (Log4jImpl.java:46) 
DEBUG 10-18 16:25:46,829 Found column "d_id", data type 4, in table "test..tbl_employee"  (Log4jImpl.java:46) 

Process finished with exit code 0

• 5、测试生成的代码
  为了测试效果，给生成的Employee示例添加toString方法

@Override
    public String toString() {
        return "Employee{" +
                "id=" + id +
                ", lastName='" + lastName + ''' +
                ", gender='" + gender + ''' +
                ", email='" + email + ''' +
                ", dId=" + dId +
                '}';
    }

测试代码1：

public class Test {
    public static void main(String[] args) throws IOException, XMLParserException, InvalidConfigurationException, SQLException, InterruptedException {
        SqlSession sqlSession = getSqlSessionFactory().openSession();
        EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);
        //查询所有
        List employees = mapper.selectByExample(null);
        employees.forEach(System.out::println);

    }
    public static SqlSessionFactory getSqlSessionFactory() throws IOException {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        return new SqlSessionFactoryBuilder().build(inputStream);
    }
}

运行结果：

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Employee{id=1, lastName='张三', gender='1', email='zhangsan@qq.com', dId=1001}
Employee{id=2, lastName='tom', gender='1', email='tom002@qq.com', dId=1002}
Employee{id=3, lastName='jerry', gender='0', email='jerry@qq.com', dId=1003}
Employee{id=4, lastName='jeck', gender='1', email='jeck004@qq.com', dId=1004}
Employee{id=5, lastName='tom', gender='1', email='tom@qq.com', dId=1005}
Employee{id=7, lastName='lucy', gender='0', email='lucy@qq.com', dId=1001}
Employee{id=10, lastName='李四', gender='1', email='lisi@qq.com', dId=1002}
Employee{id=11, lastName='王五', gender='1', email='wangwu@qq.com', dId=1003}
Employee{id=12, lastName='妍丽', gender='0', email='yanli@qq.com', dId=1004}
Employee{id=13, lastName='静娈', gender='0', email='jingluan@qq.com', dId=1003}
Employee{id=14, lastName='上官思伯', gender='1', email='shangguansibo@qq.com', dId=1004}
Employee{id=15, lastName='式微', gender='0', email='shiwei@qq.com', dId=1003}
Employee{id=16, lastName='琼琚', gender='0', email='qiongju@qq.com', dId=1004}
Employee{id=17, lastName='维曦', gender='1', email='weixi@qq.com', dId=1004}
Employee{id=18, lastName='维曦', gender='1', email='weixi@qq.com', dId=1004}

Process finished with exit code 0

测试代码2：

public class Test {
    public static void main(String[] args) throws IOException, XMLParserException, InvalidConfigurationException, SQLException, InterruptedException {
        SqlSession sqlSession = getSqlSessionFactory().openSession();
        EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);

        //xxxExample就是封装查询条件的
        EmployeeExample employeeExample = new EmployeeExample();
        //创建一个Criteria，这个Criteria就是拼装查询条件
        EmployeeExample.Criteria criteria = employeeExample.createCriteria();
        criteria.andLastNameLike("%j%");
        List employees = mapper.selectByExample(employeeExample);
        employees.forEach(System.out::println);
    }
    public static SqlSessionFactory getSqlSessionFactory() throws IOException {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        return new SqlSessionFactoryBuilder().build(inputStream);
    }
}

运行结果：

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Employee{id=3, lastName='jerry', gender='0', email='jerry@qq.com', dId=1003}
Employee{id=4, lastName='jeck', gender='1', email='jeck004@qq.com', dId=1004}

Process finished with exit code 0