源代码下载

http://git.oschina.net/youlixishi/demo-world/

db准备

http://git.oschina.net/youlixishi/demo-world/blob/master/src/mybatis/basic-demo/sql/init-2017-06-25.sql

新建实体类和数据库访问dao接口

//字段和数据库表字段保持一致， 不然就得使用表字段和类字段映射， 个人强烈不推荐
public class User {
    private String id;
    private String name;
    private String sex;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
}
//注意这里只是申请interface
public interface IUserDao {
    User getById(String id);
    void add(User user);
    void updateName(User user);注意参数传递
}

添加db配置文件和sql配置文件.全部放在resource中或者任何classpath下都行

mybatis-conf.xml




    
        
            
            
                
                
                
                
            
        
    
    
        
    


mappers/user.maper.xml



        select id, name, sex from tb_user
        where id=#{id}
    
    
        insert into tb_user values(#{id}, #{name}, #{sex})
    
    
        update tb_user set name=#{name} where id=#{id}
    

访问测试

@Test
public void add() throws IOException {
    //配置文件的名称
    String resource = "mybatis-conf.xml";
    //通过Mybatis包中的Resources对象很轻松的获取到配置文件
    Reader reader = Resources.getResourceAsReader(resource);//因为配置文件都在resource中或者classpath中，这里可以直接访问
    //通过SqlSessionFactoryBuilder创建
    SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
    //获得session实例
    SqlSession session = sqlSessionFactory.openSession();
    User user = new User();
    user.setId(UUID.randomUUID().toString());
    user.setName("francis");
    user.setSex("男");

    IUserDao mapper = session.getMapper(IUserDao.class);
    mapper.add(user);

    session.commit();
    session.close();
}