2019-04-02 随笔 MyBatis-逆向工程（MBG）

mbg.xml 文件            

 <?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>

    <!-- 
        targetRuntime="MyBatis3Simple":生成简单版的CRUD
        MyBatis3:豪华版
    
     -->
  <context id="DB2Tables" targetRuntime="MyBatis3">
      <!-- jdbcConnection：指定如何连接到目标数据库 -->
    <jdbcConnection driverClass="com.mysql.jdbc.Driver"
        connectionURL="jdbc:mysql://localhost:3306/mybatis?allowMultiQueries=true"
        userId="root"
        password="123456">
    </jdbcConnection>

    <!--  -->
    <javaTypeResolver >
      <property name="forceBigDecimals" value="false" />
    </javaTypeResolver>

    <!-- javaModelGenerator：指定javaBean的生成策略 
    targetPackage="test.model"：目标包名
    targetProject="\MBGTestProject\src"：目标工程
    -->
    <javaModelGenerator targetPackage="com.atguigu.mybatis.bean" 
            targetProject=".\src">
      <property name="enableSubPackages" value="true" />
      <property name="trimStrings" value="true" />
    </javaModelGenerator>

    <!-- sqlMapGenerator：sql映射生成策略： -->
    <sqlMapGenerator targetPackage="com.atguigu.mybatis.dao"  
        targetProject=".\conf">
      <property name="enableSubPackages" value="true" />
    </sqlMapGenerator>

    <!-- javaClientGenerator:指定mapper接口所在的位置 -->
    <javaClientGenerator type="XMLMAPPER" targetPackage="com.atguigu.mybatis.dao"  
        targetProject=".\src">
      <property name="enableSubPackages" value="true" />
    </javaClientGenerator>

    <!-- 指定要逆向分析哪些表：根据表要创建javaBean -->
    <table tableName="tbl_dept" domainObjectName="Department"></table>
    <table tableName="tbl_employee" domainObjectName="Employee"></table>
  </context>
</generatorConfiguration>

生成文件配置和测验

 1 public SqlSessionFactory getSqlSessionFactory() throws IOException {
 2         String resource = "mybatis-config.xml";
 3         InputStream inputStream = Resources.getResourceAsStream(resource);
 4         return new SqlSessionFactoryBuilder().build(inputStream);
 5     }
 6 
 7     @Test
 8     public void testMbg() throws Exception {
 9         List<String> warnings = new ArrayList<String>();
10         boolean overwrite = true;
11         File configFile = new File("mbg.xml");
12         ConfigurationParser cp = new ConfigurationParser(warnings);
13         Configuration config = cp.parseConfiguration(configFile);
14         DefaultShellCallback callback = new DefaultShellCallback(overwrite);
15         MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,
16                 callback, warnings);
17         myBatisGenerator.generate(null);
18     }
19     
20     @Test
21     public void testMyBatis3Simple() throws IOException{
22         SqlSessionFactory sqlSessionFactory = getSqlSessionFactory();
23         SqlSession openSession = sqlSessionFactory.openSession();
24         try{
25             EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.class);
26             List<Employee> list = mapper.selectByExample(null);
27             for (Employee employee : list) {
28                 System.out.println(employee.getId());
29             }
30         }finally{
31             openSession.close();
32         }
33     }
34