mybatis怎么自动生成实体类，Mapper配置文件和Dao接口

Posted 2020-10-21 sunmax

 

1.首先准备好jar包

https://github.com/mybatis/generator/releases 下载MyBatis Generator  

下载压缩包后，打开可以看到lib目录下有我们需要的jar包，添加到项目引用

 

 

 

2.和Hibernate逆向生成一样，这里也需要一个配置文件：

 

generator.xml

<?xml version="1.0" encoding="UTF-8"?>      
<!DOCTYPE generatorConfiguration      
  PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"      
  "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">      
      
<generatorConfiguration>
    <!-- 数据库驱动包的位置，我这里是放到D盘的 -->      
  <classPathEntry location="D:\\mysql-connector-java-5.1.0-bin.jar" />      
      
  <context id="Mysql2Tables" targetRuntime="MyBatis3">    
  <!-- 数据库驱动，连接url，用户名，密码 -->  
    <jdbcConnection driverClass="com.mysql.jdbc.Driver"      
        connectionURL="jdbc:mysql://192.168.144.100:3306/networkdept"      
        userId="root"      
        password="123456">      
    </jdbcConnection>      
      
    <javaTypeResolver >      
      <property name="forceBigDecimals" value="false" />      
    </javaTypeResolver>
          
      <!-- 生成实体类的包名和位置 -->   
    <javaModelGenerator targetPackage="cn.networkdepartment.pojo" targetProject="src">      
      <property name="enableSubPackages" value="true" />      
      <property name="trimStrings" value="true" />      
    </javaModelGenerator>      
      
      <!-- 生成dao接口的包名和位置 -->
    <sqlMapGenerator targetPackage="cn.networkdepartment.dao"  targetProject="src">      
      <property name="enableSubPackages" value="true" />      
    </sqlMapGenerator>   
       
      <!-- 生成的映射文件包名和位置 --> 
    <javaClientGenerator type="XMLMAPPER" targetPackage="cn.networkdepartment.dao"  targetProject="src">      
      <property name="enableSubPackages" value="true" />      
    </javaClientGenerator> 
    
     <!-- 要生成的那些表(更改tableName 和domainObjectName 就可以了) -->    
    <table schema="test" tableName="nd_class" domainObjectName="NClass" enableCountByExample="false" enableUpdateByExample="false"      
           enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">      
    </table>
          
    <table schema="test" tableName="nd_integral" domainObjectName="Integral" enableCountByExample="false" enableUpdateByExample="false"      
       enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">      
   </table>
         
   <table schema="test" tableName="nd_log" domainObjectName="Nlog" enableCountByExample="false" enableUpdateByExample="false"      
       enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">      
   </table>
   
    <table schema="test" tableName="nd_maintain" domainObjectName="Maintain" enableCountByExample="false" enableUpdateByExample="false"      
       enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">      
   </table>
   
      <table schema="test" tableName="nd_member" domainObjectName="Member" enableCountByExample="false" enableUpdateByExample="false"      
       enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">      
   </table> 
      <table schema="test" tableName="nd_post" domainObjectName="Npost" enableCountByExample="false" enableUpdateByExample="false"      
       enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">      
   </table> 
      <table schema="test" tableName="nd_systemset" domainObjectName="Systemset" enableCountByExample="false" enableUpdateByExample="false"      
       enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">      
   </table>   
  </context>      
</generatorConfiguration>  

 

 3.创建一个类通过main方法生成代码，运行这个类

package test;  
import java.io.File;    
import java.io.IOException;    
import java.sql.SQLException;    
import java.util.ArrayList;    
import java.util.List;    
    
import org.mybatis.generator.api.MyBatisGenerator;    
import org.mybatis.generator.config.Configuration;    
import org.mybatis.generator.config.xml.ConfigurationParser;    
import org.mybatis.generator.exception.InvalidConfigurationException;    
import org.mybatis.generator.exception.XMLParserException;    
import org.mybatis.generator.internal.DefaultShellCallback;    

/**
 * 创建测试类，加载配置文件自动生成dao，Mapper文件
 * @author Bryce
 *
 */
public class MybatisGeneratorUtil {    
    
    public static void main(String[] args) {    
        try {    
            System.out.println("start generator ...");    
            List<String> warnings = new ArrayList<String>();    
            boolean overwrite = true;    
            File configFile = new File(MybatisGeneratorUtil.class.getResource("/generator.xml").getFile());    
            ConfigurationParser cp = new ConfigurationParser(warnings);    
            Configuration config = cp.parseConfiguration(configFile);    
            DefaultShellCallback callback = new DefaultShellCallback(overwrite);    
            MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);    
            myBatisGenerator.generate(null);    
            System.out.println("end generator!");    
        } catch (IOException e) {    
            e.printStackTrace();    
        } catch (XMLParserException e) {    
            e.printStackTrace();    
        } catch (InvalidConfigurationException e) {    
            e.printStackTrace();    
        } catch (SQLException e) {    
            e.printStackTrace();    
        } catch (InterruptedException e) {    
            e.printStackTrace();    
        }    
    }    
        
}  

然后就可以看到实体类和dao都生成了