数据库ORM框架mybatis 学习篇

数据库ORM框架mybatis 学习篇

1，老套路加载依赖库或者jar

  org.mybatis
  mybatis
  3.4.7
```
 
        
            mysql
            mysql-connector-java
            5.1.18
        

2.配置mybatis-config.xml

3 配置"DemoMapper.xml

	
		select * from demo where id = #{id}
    

4测试 注明（持久化对象，创建数据库略过）这里认为你是 熟悉Java的童鞋

	
@Test*斜体样式*
public void testMybatis() {
	String resource = "mybatis-config.xml";**//注意配置classpath 下**
	InputStream inputStream;
	try {
		inputStream = Resources.getResourceAsStream(resource);
		SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
	   SqlSession s= sqlSessionFactory.openSession();
	  Demo d= (Demo)s.selectOne("bean.Demo.UserMapper.selectUserByID", 3);
	  System.out.println("----"+d.getId());
	  System.out.println("----"+d.getName());
	   
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	
}