mybatis 里 mysql高效率批量插入

1，单条

UPDATE ho_house
SET cn_name = CASE id
WHEN 16 THEN 7.6
WHEN 19 THEN 8.86
WHEN 20 THEN 9
END
WHERE id IN (16,19,20)

2，多条

UPDATE ho_house
SET cn_name = CASE cid
WHEN 1 THEN 'Name 1'
WHEN 2 THEN 'Name 1'
WHEN 3 THEN 'Name 1'
END,
en_name = CASE cid
WHEN 1 THEN 'Name 1'
WHEN 2 THEN 'Name 2'
WHEN 3 THEN 'Name 3'
END

WHERE cid IN (1,2,3) and pcate in (24,27,26) and ccate in (277,271,207)...[多条件时直接: and 字段 in()]

3，mybatis 的多条 5000条用时 2分钟
   
   <update id="updateList" parameterType="java.util.List">
   UPDATE ho_house
   SET code = CASE id
   <foreach collection="list" item="item">
   WHEN #{item.id} THEN #{item.code}
   </foreach>
   END,
            cn_name = CASE id
   <foreach collection="list" item="item">
   WHEN #{item.id} THEN #{item.cnName}
   </foreach>
   END,
            en_name = CASE id
   <foreach collection="list" item="item">
   WHEN #{item.id} THEN #{item.enName}
   </foreach>
   END,
            actual_name = CASE id
   <foreach collection="list" item="item">
   WHEN #{item.id} THEN #{item.actualName}
   </foreach>
   END,
            update_date = CASE id
   <foreach collection="list" item="item">
   WHEN #{item.id} THEN #{item.updateDate}
   </foreach>
   END,
            update_by = CASE id
   <foreach collection="list" item="item">
   WHEN #{item.id} THEN #{item.updateBy.id}
   </foreach>
   END
   WHERE
   id in
   <foreach collection="list" item="item" open="(" separator="," close=")">
   #{item.id}
   </foreach>
   </update>

4，对比另一种批量，实际还是生成单个sql一条一条更新的 5000条用时20分钟

、 <update id="updateList" parameterType="java.util.List">
   <foreach collection="list" index="index" item="e" >
           UPDATE ho_house SET
               code = #{e.code},
               cn_name = #{e.cnName},
               en_name = #{e.enName},
               actual_name = #{e.actualName},
               update_date = #{e.updateDate},
               update_by = #{e.updateBy.id}
           WHERE id = #{e.id} ;
       </foreach>
   </update>

5，创建临时表，先更新临时表，然后从临时表中update

create tem table tmp(id int(4) primary key,dr varchar(50));
insert into tmp values (0,’gone’), (1,’xx’),…(m,’yy’);
update test_tbl, tmp set test_tbl.dr=tmp.dr where test_tbl.id=tmp.id;

参考： https://blog.csdn.net/zl570932980/article/details/72468875

mybatis 里 mysql高效率批量插入

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