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mysql 複数行のupdate

Posted at

大量にUPDATEしたい

場合に


update work_shops set point = 10 where id = 1;
update work_shops set point = 20 where id = 2;
update work_shops set point = 30 where id = 3;
update work_shops set point = 40 where id = 4;
update work_shops set point = 50 where id = 5;
update work_shops set point = 60 where id = 6;
update work_shops set point = 70 where id = 7;

こんなのを何行も書いてやってましたのでまー時間がかかっちゃいますね。

INSERT ... ON DUPLICATE KEY UPDATE 構文

を使ったらいいと。

まずはふつうにINSERT文を作る


INSERT INTO work_shops (id, point) VALUES
(1,10),
(2,20),
(3,30),
(4,40),
(5,50),
(6,60),
(7,70)


ON DUPLICATE KEY UPDATE point = VALUES(`point`);

更新したい値を指定。

でOK。

id はプライマリーキー

work_shops.id に 同じキーが
なければINSERT。
あればUPDATE。

される。

OK。

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