1.复杂条件批量删除
建议增加联合索引
<!--通过条件删除数据--> <delete id="batchDeleteByCondition"> delete from test where <foreach collection="list" item="item" separator=" or " index="index"> (name = #{item.name} and code= #{item.code} and type = #{item.type}) </foreach> </delete> 讯享网
2. 复杂条件批量删除 IN操作
讯享网<delete id="deleteBatch" parameterType="java.util.List"> delete from test where (NAME, CODE) in <foreach item="item" index="index" collection="list" separator="," open="(" close=")"> (#{item.name},#{item.code}) </foreach> </delete>
3. 批量删除常规
<delete id="batchDelete"> delete from test where id in ( <foreach collection="list" item="id" separator=","> #{id} </foreach> ) </delete> 4.Oracle IN超过1000删除
讯享网//方案1: DELETE FROM test WHERE id IN <!-- 处理in的集合超过1000条时Oracle不支持的情况 --> <trim suffixOverrides=" OR id IN()"> <foreach collection="list" item="item" index="index" open="(" close=")"> <if test="index != 0"> <choose> <when test="index % 1000 == 999">) OR id IN (</when> <otherwise>,</otherwise> </choose> </if> #{item} </foreach> </trim> 方案2: DELETE FROM test WHERE org_id IN <foreach collection="list" item="item" index="index" open="(" close=")"> <choose> <!--第一项--> <when test="index == 0">#{item}</when> <!--OR语句中的第一项--> <when test="index != 0 and index % 500 == 0">) OR org_id IN ( #{item}</when> <!--非第一项--> <otherwise>,#{item}</otherwise> </choose> </foreach>
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