mybatis逆向工程

最新推荐文章于 2024-12-26 15:14:31 发布

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最新推荐文章于 2024-12-26 15:14:31 发布

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分类专栏： mybatis

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通过genrator实现，官网为：

http://www.mybatis.org/generator/configreference/xmlconfig.html

配置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>

  <context id="DB2Tables" targetRuntime="MyBatis3Simple">
  	<!-- 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="1234">
    </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="department" domainObjectName="Department"></table>
    <table tableName="employee" domainObjectName="Employee"></table>
  </context>
</generatorConfiguration>

然后运行测试类：

@org.junit.Test
	public void testMbg() throws Exception {
		List<String> warnings = new ArrayList<String>();
		boolean overwrite = true;
		File configFile = new File("mbg.xml");
		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);
	}

刷新工程，即可逆向生成mapper.xml,实体类和接口

只能生成一些简单的增删改查方法

通过更改配置可以逆向生成更多的方法，如一些带查询条件的方法：

更改

<context id="DB2Tables" targetRuntime="MyBatis3Simple">

<!-- 
		targetRuntime="MyBatis3Simple":生成简单版的CRUD
		MyBatis3:豪华版
	
	 -->

测试逆向工程：

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

SqlSessionFactory sessionFactory=getSqlSessionFactory();
		SqlSession session=sessionFactory.openSession();
		
		EmployeeMapper mapper=session.getMapper(EmployeeMapper.class);
		//查询所有
		/*List<Employee> employee=mapper.selectByExample(null);
		for(Employee e: employee) {
			System.out.println(e.getName());
		}*/
		//查询员工姓名有a,性别++的
		EmployeeExample employeeExample = new EmployeeExample();
		//创建一个criteria,拼装查询条件
		Criteria criteria=employeeExample.createCriteria();
		criteria.andNameLike("a");
		criteria.andGenderEqualTo("aa");
		
		//创建第二个criteria，可以与其他的criteria用or连接在一起查询
		Criteria criteria2=employeeExample.createCriteria();
		criteria2.andEmailEqualTo("aaa");
		
		
		List<Employee> employee=mapper.selectByExample(employeeExample);
		for(Employee e: employee) {
			System.out.println(e.getName());
		}
		session.close();