我知道这个问题在这些论坛上可能会被问到太多次,但我真的找不到可靠的答案.他们都给出了不同的方法.
$sql = "UPDATE $userName SET P1 = '$p1MON' WHERE day = 'MON1'";
是否可以在同一查询中更新多行?像这样的东西:
$sql = "UPDATE $userName SET P1 = '$p1MON' WHERE day = 'MON1',
UPDATE $userName SET P1 = '$p1TUE' WHERE day = 'TUE1',
UPDATE $userName SET P1 = '$p1WED' WHERE day = 'WED1'";
谢谢.
编辑:评论中的建议似乎不起作用……
$sql = "UPDATE $userName SET P1 = '$p1MON' WHERE day = 'MON1';
UPDATE $userName SET P1 = '$p1TUE' WHERE day = 'TUE1';
UPDATE $userName SET P1 = '$p1WED' WHERE day = 'WED1'";
解决方法:
使用案例表达式:
UPDATE $userName
SET P1 = case day
when 'MON1' then '$p1MON'
when 'TUE1' then '$p1TUE'
when 'WED1' then '$p1WED'
end
where day IN ('MON1', 'TUE1', 'WED1')