mybaties的简单使用

需要下载的jar包：
链接：https://pan.baidu.com/s/1FUtXK_v-oTiV6paTaVcr0A
提取码：r2e9

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mybaties-config.xml（配置文件）：

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UserMapper.java（dao层接口定义）：

public interface UserMapper {
      User getUserByID(String id);
      int addUser(User user);
}

UserMapper.xml（dao层接口实现）：

    
    
    

    
        select * from user where id = #{id}
    
    
        insert into user values (#{id},#{name},#{age})
    

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User.java（实体类）：

public class User{
    private int id;
    private String name;
    private  int  age;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
    public  void  Output(){
        System.out.println("姓名："+getName()+", 年龄："+getAge());
    }
}

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Main方法测试：

public static void test() throws IOException{
        String resource = "mybatis-config.xml";
        Reader reader = Resources.getResourceAsReader(resource);
        SqlSessionFactory factory=new SqlSessionFactoryBuilder().build(reader);
        //加载配置文件
        SqlSession session=factory.openSession();
        String statement="dao.UserMapper.getUserByID";
        //找到对应的接口
        User user=session.selectOne(statement, 123);
        //执行查询
        user.Output();
        User user2 = new User();
        user2.setId(1);
        user2.setName("zhang");
        user2.setAge(22);
        statement = "dao.UserMapper.addUser";
        user2.Output();
        System.out.println(session.insert(statement,user2));
        session.commit();
        //执行完事物操作后要提交才能保存到数据库

    }