VIPJAVA/02_JavaWeb/day06_mybatis/target/classes/com/lc/mapper/UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.lc.mapper.UserMapper">
    <!--
        - 映射文件名与接口名一致
        - 映射文件namespace与接口全类名路径一致
        - 映射文件SQL的Id与接口的方法名一致   -->
    
    <select id="getUserList" resultType="user" >
        select * from t_user;
    </select>

    <!--
        根据id查询
        id = 接口种的方法  唯一
        parameterType 输入参数 id int
        resultType 返回结果
        获取参数 #{id}

        注意:
            resultType = 接扣中方法的返回值类型 是集合List<User> 单个 User
            parameterType = 接口中方法参数 类型一直

            获取参数 #{id} 就是接口中的形参
     -->
    <select id="getUserById" parameterType="int" resultType="user"  >
        select * from t_user where id = #{id};
    </select>


    <!--
        insert
        当传入的参数是对象 bean
        直接#{属性} 获取
     -->
    <insert id="addUser" parameterType="user" >
        INSERT INTO
            `t_user` (`id`, `username`, `password`, `gender`, `address`, `dept_id`)
        VALUES
            (#{id}, #{username}, #{password}, #{gender}, #{address}, #{deptId});
    </insert>

    <!--
        insert
            useGeneratedKeys 调用 getGeneratedKeys 方法来取出由数据库内部生成的主键
            keyProperty 指定接收的属性 getGeneratedKeys的返回值
     -->
    <insert id="addUserKey"
            useGeneratedKeys="true"
            keyProperty="id"
            parameterType="user" >
        INSERT INTO
            `t_user` ( `username`, `password`, `gender`, `address`, `dept_id`)
        VALUES
            ( #{username}, #{password}, #{gender}, #{address}, #{deptId});
    </insert>

    <!--
        update 标签
      -->
    <update id="udpateUserById">
        UPDATE
            `t_user`
        SET
            `username` = #{username},
            `password` = #{password},
            `gender` = #{gender},
            `address` = #{address},
            `dept_id` = #{deptId}
        WHERE `id` = #{id};
    </update>

    <!-- 删除 -->
    <delete id="delUserById" >
        DELETE FROM t_user WHERE id = #{id};
    </delete>
    
</mapper>