Mybatis批量操作sql寫法

批量Insert，參數爲List<Object>

mysql的批量新增sql的寫法示例，先看一下mapper的寫法；

    void batchSaveUser(List<SysUser> userList);

接下來看sql如何寫；

   <insert id="batchSaveUser">
       insert into sys_user (ding_user_id, username, nickname, password, email, 
       mobile, avatar, creator_id, create_time, updator_id, update_time, is_delete)
       values
       <foreach collection="list" item="user" separator=",">
           (
           #{user.dingUserId}, #{user.username}, #{user.nickname}, #{user.password}, #{user.email},
           #{user.mobile}, #{user.avatar}, #{user.creatorId}, now(), #{user.updatorId}, now(), 0
           )
       </foreach>
   </insert>

批量Insert，參數爲Map<Long, List<Long>>

void batchSaveGroupAndUser(@Param("map") Map<Long, List<Long>> groupUserMap);

<insert id="batchSaveGroupAndUser" parameterType="java.util.Map">
        insert into sys_group_member (group_id, user_id, creator_id, create_time)
        values
        <foreach collection="map.keys" item="groupId" separator=",">
            <foreach collection="map[groupId]" item="userId" separator=",">
                (
                #{groupId}, #{userId}, 'admin', now()
                )
            </foreach>
        </foreach>
    </insert>

批量Update，參數爲List<Object>

**注意：**在執行批量Update的時候，數據庫的url配置需要添加一項參數：&allowMultiQueries=true

如果沒有這個配置參數的話，執行下面的更新語句會報錯：

	<update id="batchUpdateCorporation" parameterType="java.util.List">
        <foreach collection="list" item="item" index="index" separator=";">
            update sys_corporation set
            <if test="item.name != null and item.name !=''">
                `name` = #{item.name},
            </if>
            <if test="item.code != null and item.code !=''">
                code = #{item.code},
            </if>
            <if test="item.parentCode != null and item.parentCode !=''">
                parent_code = #{item.parentCode},
            </if>
            updater = 'system',
            update_time = now()
            where id = #{item.id}
        </foreach>
    </update>