VIP23/04maven/mybatis/target/classes/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.sf.mapper.UserMapper">
<!--
namespace：关联接口和接口对应的.文件，通过接口的全类名进行关联
id:对应我们接口中的方法名称
parameterType：入参对象全类名
                   引用类型和基本数据类型
                   引用：对象的全类名
                   基本数据类型：int  ->   int
sql ： INSERT into user(user_id,user_name,create_time) VALUES (1,"admin","2021-01-12")
userMapper.xml文件中    insert into user (user_id,user_name,create_time) values (#{userId},#{userName},#{createTime})
#{xxx}:ognl表达式，引用类型 ：通过表达式去获取入参中的属性值。
                   基本数据类型：直接获取的是入参值
-->
    <insert id="addUser" parameterType="user">
        insert into user (user_id,user_name,create_time) values (#{userId},#{userName},#{createTime})
    </insert>

    <update id="updateUser" parameterType="user">
        update user set user_name=#{userName},create_time=#{createTime} where user_id = #{userId}
    </update>

<!--    删除用户根据用户的id-->

    <delete id="deleteUser" parameterType="integer">
        delete from user where user_id = #{userId}
    </delete>


<!--    查询列表
id：查询列表的方法名称
resultType ： 方法的返回值类型
select user_id , user_name ,create_time from user
-->
    <select id="getUserList" resultType="user">
        select user_id  , user_name ,create_time from user
    </select>

<!--    根据用户的id查询详情-->
    <select id="getUserInfo" resultType="user" parameterType="integer">
        select user_id  , user_name ,create_time from user where user_id = #{userId}
    </select>


<!--    批量添加-->
    <insert id="batchAddUsers" parameterType="user">
        insert into user (user_id,user_name,create_time)  VALUES
          <foreach collection="users" item="item" separator=",">
             (#{item.userId},#{item.userName},#{item.createTime})
          </foreach>
    </insert>

<!--    批量添加2  根据类型进行匹配-->

    <insert id="batchAddUsers2" parameterType="user">
        insert into user (user_id,user_name,create_time)  VALUES
          <foreach collection="list" separator="," item="item">
        (#{item.userId},#{item.userName},#{item.createTime})
         </foreach>
    </insert>

<!--    批量删除-->
        <delete id="batchDeleteByIds" parameterType="integer">
            delete from user where user_id in
                             <foreach collection="ids" item="item" open="(" separator="," close=")">
                                 #{item}
                             </foreach>
        </delete>

<!--    批量查询-->
    <select id="batchGetUsers" parameterType="integer" resultType="user">
        select * from user where user_id in
                           <foreach collection="ids" item="item" open="(" separator="," close=")">
                               #{item}
                           </foreach>
    </select>


<!--    批量更新-->
    <update id="batchUpdateUsers" parameterType="user">
        <foreach collection="users" item="item" separator=";">
            update user
                <set>
            <if test="item.userId != null">
                user_name = #{item.userName} ,
            </if>
                <if test="item.createTime != null">
                    create_time = #{item.createTime}
                </if>
                </set>
        where user_id = #{item.userId}
        </foreach>
    </update>

</mapper>