Mybatis批量操作sql写法示例(批量新增、更新)
在使用foreach时,collection属性值的三种情况:
如果传入的参数类型为List时,collection的默认属性值为list,同样可以使用@Param注解自定义keyName;
如果传入的参数类型为array时,collection的默认属性值为array,同样可以使用@Param注解自定义keyName;
如果传入的参数类型为Map时,collection的属性值可为三种情况:
1.遍历map.keys;
2.遍历map.values;
3.遍历map.entrySet()
批量Insert,参数为List<Object>
mysql的批量新增sql的写法示例,先看一下mapper的写法;
void batchSaveUser(List<SysUser> userList);
接下来看sql如何写:
<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,参数为Map<Long, List<Long>>
void batchSaveGroupAndUser(@Param("map") Map<Long, List<Long>> groupUserMap);
接下来看sql如何写:
<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Insert,参数为Map<String, String>
void batchInsert(@Param("map") Map<String, String> map);
<insert id="batchInsert" parameterType="java.util.Map"> insert into brand_info (code, `name`, is_delete, create_time) values <foreach collection="map.entrySet()" index="key" item="value" open="(" close=")" separator=","> #{key}, #{value}, 0, now() </foreach> </insert>
如果是只需要遍历key,写法则是collection=“map.keys”
<insert id="batchSave" parameterType="java.util.Map"> insert into brand_info (code, is_delete, create_time) values <foreach collection="map.keys" item="key" open="(" close=")" separator=","> #{key}, 0, now() </foreach> </insert>
同理,如果是只需要遍历value,写法则是collection=“map.values”
<insert id="batchSave" parameterType="java.util.Map"> insert into brand_info (code, is_delete, create_time) values <foreach collection="map.values" item="value" open="(" close=")" separator=","> #{value}, 0, now() </foreach> </insert>
批量Update,参数为List<Object>
**注意:**在执行批量Update的时候,数据库的url配置需要添加一项参数:&allowMultiQueries=true
如果没有这个配置参数的话,执行下面的更新语句会报错:
正确的sql写法如下:
<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>
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