我知道你可以一次插入多行,是否有一种方法可以一次更新多行(如在,在一个查询)在MySQL?

编辑: 例如,我有以下内容

Name   id  Col1  Col2
Row1   1    6     1
Row2   2    2     3
Row3   3    9     5
Row4   4    16    8

我想将以下所有更新组合成一个查询

UPDATE table SET Col1 = 1 WHERE id = 1;
UPDATE table SET Col1 = 2 WHERE id = 2;
UPDATE table SET Col2 = 3 WHERE id = 3;
UPDATE table SET Col1 = 10 WHERE id = 4;
UPDATE table SET Col2 = 12 WHERE id = 4;

当前回答

是的. .可以使用INSERT ON DUPLICATE KEY UPDATE sql语句.. 语法: INSERT INTO table_name (a,b,c) VALUES (1,2,3),(4,5,6) 重复键更新a=VALUES(a),b=VALUES(b),c=VALUES(c)

其他回答

UPDATE table1, table2 SET table1.col1='value', table2.col1='value' WHERE table1.col3='567' AND table2.col6='567'

这应该对你有用。

MySQL手册中有关于多个表的参考。

是的. .可以使用INSERT ON DUPLICATE KEY UPDATE sql语句.. 语法: INSERT INTO table_name (a,b,c) VALUES (1,2,3),(4,5,6) 重复键更新a=VALUES(a),b=VALUES(b),c=VALUES(c)

use

REPLACE INTO`table` VALUES (`id`,`col1`,`col2`) VALUES
(1,6,1),(2,2,3),(3,9,5),(4,16,8);

请注意:

Id必须是一个主唯一键 如果使用外键来 引用表,REPLACE删除然后插入,所以这可能 造成错误

下面的操作将更新一个表中的所有行

Update Table Set
Column1 = 'New Value'

下一个将更新Column2值大于5的所有行

Update Table Set
Column1 = 'New Value'
Where
Column2 > 5

Unkwntech有一个更新多个表的例子

UPDATE table1, table2 SET
table1.col1 = 'value',
table2.col1 = 'value'
WHERE
table1.col3 = '567'
AND table2.col6='567'
UPDATE `your_table` SET 

`something` = IF(`id`="1","new_value1",`something`), `smth2` = IF(`id`="1", "nv1",`smth2`),
`something` = IF(`id`="2","new_value2",`something`), `smth2` = IF(`id`="2", "nv2",`smth2`),
`something` = IF(`id`="4","new_value3",`something`), `smth2` = IF(`id`="4", "nv3",`smth2`),
`something` = IF(`id`="6","new_value4",`something`), `smth2` = IF(`id`="6", "nv4",`smth2`),
`something` = IF(`id`="3","new_value5",`something`), `smth2` = IF(`id`="3", "nv5",`smth2`),
`something` = IF(`id`="5","new_value6",`something`), `smth2` = IF(`id`="5", "nv6",`smth2`) 

//你只是在php中构建它

$q = 'UPDATE `your_table` SET ';

foreach($data as $dat){

  $q .= '

       `something` = IF(`id`="'.$dat->id.'","'.$dat->value.'",`something`), 
       `smth2` = IF(`id`="'.$dat->id.'", "'.$dat->value2.'",`smth2`),';

}

$q = substr($q,0,-1);

所以你可以用一个查询更新孔表