Question

我有数组（[406] =＆gt; 1 [407] =＆gt; 3 [408] =＆gt; 2 [409] =＆gt; 7 [410] =＆gt; 1）

以mysql查询运行

UPDATE counter SET total = 1 WHERE id = 406;
UPDATE counter SET total = 3 WHERE id = 407;
UPDATE counter SET total = 2 WHERE id = 408;
UPDATE counter SET total = 7 WHERE id = 409;
UPDATE counter SET total = 1 WHERE id = 410;

我只能通过将相同的总值分组如下来优化上面的查询：

UPDATE counter
    SET total = 1
    WHERE name IN (406, 410);

有没有办法更好地优化它，而不是逐个执行（循环）更新查询。

Answer 1

你需要这个：

UPDATE counter SET total = CASE 
   WHEN id = 406 THEN 1
   WHEN id = 407 THEN 3
   WHEN id = 408 THEN 2
   WHEN id = 409 THEN 7
   WHEN id = 410 THEN 1
   END

Answer 2

您可以使用键值对进行更新，如下所示

UPDATE counter SET total = '".$value."' WHERE id = '".$key."';

使用多个值更新多行（同一列）

2 个答案: