MySQL批量update数据(更新的数据值不同)

(一)纯mysql:

UPDATE my_table SETstatus = CASE idWHEN 1 THEN 3WHEN 2 THEN 4WHEN 3 THEN 5END,title = CASE idWHEN 1 THEN 'New Title 1'WHEN 2 THEN 'New Title 2'WHEN 3 THEN 'New Title 3'END
WHERE id IN (1,2,3)

(二)mybatis写法

1:foreach

<update id="batchUpdate" parameterType="java.util.List">update my_table set  status=<foreach collection="listName" item="item" index="index" separator=" " open="case id" close="end">when #{item.id} then #{item.status}</foreach>where id in<foreach collection="listName" index="index" item="item" separator="," open="(" close=")">#{item.id,jdbcType=BIGINT}</foreach></update>

2:trim

<update id="batchUpdate" parameterType="java.util.List">update my_table<trim prefix="set" suffixOverrides=","><trim prefix="status =case" suffix="end,"><foreach collection="listName" item="item" index="index">when id=#{item.id} then #{item.status}</foreach></trim></trim>where id in<foreach collection="listName" index="index" item="item" separator="," open="(" close=")">#{item.id,jdbcType=BIGINT}</foreach>
</update>

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