MySQL进行 批量插入，批量删除，批量更新，批量查询

1、批量插入

ServiceImpl层

List<Person> addPeople = new ArrayList<>(); //addPeople存放多个Person对象
personMapper.insetPeopleReturnIds(addPeople);

Dao层接口（这里的注解param中的list对应xml中的 collection的值， 两者要保持一致！ ）

int insetPeopleReturnIds(@Param("list") List<Person> addPeople);

Mapper.xml

（keyColumn是数据库的字段，keyProperty对应的是实体类的属性，为的是让ID自增长）

<insert id="insetPeopleReturnIds" keyColumn="person_id" keyProperty="personId" parameterType="java.util.List"
            useGeneratedKeys="true">
        insert into person (person_name, id_type,
        id_num, phone,org_id)
        values
        <foreach collection="list" index="index" item="item" separator=",">
            (#{item.personName,jdbcType=VARCHAR}, #{item.idType,jdbcType=INTEGER},
            #{item.idNum,jdbcType=VARCHAR}, #{item.phone,jdbcType=VARCHAR},#{item.orgId,jdbcType=INTEGER})
        </foreach>
</insert>

2、批量删除

ServiceImpl层

List<String> list; //list中作者存放的是字符串,格式["123","456"]
uploadListMapper.deleteByPrimaryUUid(list);

Dao层接口

int deleteByPrimaryUUid(@Param("lists") List<String> list);

Mapper.xml

<delete id="deleteByPrimaryUUid" parameterType="java.util.List">
        delete from upload_list
        where uuid in
        <foreach close=")" collection="lists" index="index" item="item" open="(" separator=",">
            #{item,jdbcType=VARCHAR}
        </foreach>
</delete>

3、批量更新

ServiceImpl层

List<Person> oldPeople = new ArrayList<>();//oldPeople存放多个person对象
personMapper.updateBatch(oldPeople);

Dao层接口

int updateBatch(@Param("list") List<Person> list);

Mapper.xml

 <update id="updateBatch" parameterType="java.util.List">
        update person
        <trim prefix="set" suffixOverrides=",">
            <trim prefix="person_name =case" suffix="end,">
                <foreach collection="list" index="index" item="item">
                    when person_id = #{item.personId} then #{item.personName}
                </foreach>
            </trim>
            <trim prefix="id_type =case" suffix="end,">
                <foreach collection="list" index="index" item="item">
                    when person_id = #{item.personId} then #{item.idType}
                </foreach>
            </trim>
            <trim prefix="id_num =case" suffix="end,">
                <foreach collection="list" index="index" item="item">
                    when person_id = #{item.personId} then #{item.idNum}
                </foreach>
            </trim>
            <trim prefix="phone =case" suffix="end,">
                <foreach collection="list" index="index" item="item">
                    when person_id = #{item.personId} then #{item.phone}
                </foreach>
            </trim>
        </trim>
        where person_id in
        <foreach close=")" collection="list" item="item" open="(" separator=",">
            #{item.personId}
        </foreach>
 </update>

4、批量查询

ServiceImpl层

List<String> list; //list中作者存放的是字符串,格式["123","456"]

List<UploadList> uploadLists = uploadListMapper.selectByPrimaryUUid(list);

Dao层接口

List<UploadList> selectByPrimaryUUid(@Param("lists") List<String> list);

Mapper.xml　

 <select id="selectByPrimaryUUid" resultMap="BaseResultMap">
        select *
        from upload_list
        where uuid in
        <foreach close=")" collection="lists" index="index" item="item" open="(" separator=",">
            #{item,jdbcType=VARCHAR}
        </foreach>
 </select>

参考文章https://www.cnblogs.com/javalanger/p/10899088.html

https://blog.csdn.net/q957967519/article/details/88669552