增删改查的实现

UserMapper

public interface UserMapper {
    // 查询全部用户
    List<User> getUserList();

    // 根据id查询用户
    User getUserById(int id);

    // 添加用户
    int addUser(User user);
    
    // 修改用户
    int updateUser(User user);

    // 删除一个用户
    int deleteUser(int id);


}

UserMapper.xml文件

<insert id="addUser" parameterType="com.mine.pojo.User"  >
        insert into mybatis.user(id, name, pwd) values (#{id},#{name},#{pwd});
    </insert>



    <update id="updateUser" parameterType="com.mine.pojo.User">
       update mybatis.user set name = #{name},pwd = #{pwd}  where id = #{id};
    </update>

    <delete id="deleteUser" parameterType="int">
       delete from mybatis.user where id = #{id};
    </delete>

注意事项：操作要和标签一一对应  update 对应update   delete对应delete