mybatis的特殊情景语句操作

本文主要是介绍mybatis的特殊情景语句操作，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

一、批量插入或者更新：减少与数据库交互

<insert id="betchInsertMallItemPrice" parameterType="java.util.List">  <![CDATA[ insert into mall_item_price (mall_item_id, price,discout_price,limit_num,level,create_user_id,type,status,gmt_create,gmt_modify,attribute,comm_only_key) values ]]><foreach collection="list" item="mallItemPrice" index="index" separator=","> <![CDATA[ (#{mallItemPrice.mallItemId}, #{mallItemPrice.price}, #{mallItemPrice.discoutPrice}, #{mallItemPrice.limitNum}, #{mallItemPrice.level}, #{mallItemPrice.createUserId}, #{mallItemPrice.type}, #{mallItemPrice.status}, #{mallItemPrice.gmtCreate},#{mallItemPrice.gmtModify}, #{mallItemPrice.attribute}, #{mallItemPrice.commOnlyKey}) ]]></foreach><selectKey resultType="long" keyProperty="id">SELECT @@IDENTITY AS id</selectKey></insert>

二、批量更新以及插入：

<insert id="replaceMallItemPrice" parameterType="java.util.List">  <![CDATA[ replace into mall_item_price (id,mall_item_id, price,discout_price,limit_num,level,create_user_id,type,status,gmt_create,gmt_modify,attribute,comm_only_key) values ]]><foreach collection="list" item="mallItemPrice" index="index" separator=","> <![CDATA[ (#{mallItemPrice.id},#{mallItemPrice.mallItemId}, #{mallItemPrice.price}, #{mallItemPrice.discoutPrice}, #{mallItemPrice.limitNum}, #{mallItemPrice.level}, #{mallItemPrice.createUserId}, #{mallItemPrice.type}, #{mallItemPrice.status}, #{mallItemPrice.gmtCreate},#{mallItemPrice.gmtModify}, #{mallItemPrice.attribute}, #{mallItemPrice.commOnlyKey}) ]]></foreach><selectKey resultType="int" keyProperty="id">SELECT @@IDENTITY AS id</selectKey></insert>

三、数据库存   1,2,3,13    判断1是否在其中

<select id="getMallActivityListByLevel" resultType="com.mall.pojo.MallActivity"  parameterType="java.lang.Integer">select *from mall_activity where status = 1 and comm_only_key = #{1} and find_in_set(#{0},activity_rull) order by id DESC</select>

此处用的是find_in_set()函数

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