mybatis的特殊情景语句操作

最新推荐文章于 2024-08-08 14:00:00 发布

原创最新推荐文章于 2024-08-08 14:00:00 发布 · 354 阅读

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本文介绍了使用MyBatis进行批量插入与更新的XML配置方法，并展示了如何利用find_in_set函数进行特定数值的查找，提高了数据库操作效率。

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