Mybatis执行批量更新的sql(mysql中)
2021/11/11 2:10:26
本文主要是介绍Mybatis执行批量更新的sql(mysql中),对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
方式一
<update id="batchUpdate"> <foreach collection="list" item="item" index="index" open="" close="" separator=";"> update tableA set full_pinyin = #{item.fullPinyin}, first_letters = #{item.firstLetters} where id = #{item.id} </foreach> </update>
此种方式数据库连接必须配置:&allowMultiQueries=true,如:jdbc:mysql://i.cnblogs.com:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
否则会报错:
会生成多条sql,一次事务
方式二
<update id="batchUpdate"> update tableA set full_pinyin = <foreach collection="list" item="item" index="index" separator=" " open="case id" close="end"> when #{item.id} then #{item.fullPinyin} </foreach> ,first_letters = <foreach collection="list" item="item" index="index" separator=" " open="case id" close="end"> when #{item.id} then #{item.firstLetters} </foreach> where id in <foreach collection="list" item="item" index="index" separator="," open="(" close=")"> #{item.id} </foreach> </update>
此种方式会生成一条sql,一次事务
如:
update tableA set full_pinyin = case id when 570421480220418048 then 'huangmenji' when 570451322303307776 then 'fenjianceshikehu' end , first_letters = case id when 570421480220418048 then 'hmj' when 570451322303307776 then 'fjcskh' end where id in ( 570421480220418048 , 570451322303307776 );
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