Question

我试图用多更新语句更新mysql表。
我尝试了我做多选的方式，但它给出了错误。

  UPDATE  (
    UPDATE resources SET resources.resourcecount = resources.resourcecount - '100'
    WHERE resourcetype = '1'
    ),
    (
        UPDATE resources SET resources.resourcecount = resources.resourcecount - '250'
    WHERE resourcetype = '2'
    ),
    (
        UPDATE resources SET resources.resourcecount = resources.resourcecount - '300'
    WHERE resourcetype = '3'
    ),
        (
        UPDATE resources SET resources.resourcecount = resources.resourcecount - '600'
    WHERE resourcetype = '4'
    )

我不知道是否有可能通过查询本身或者我应该使用PHP循环吗？

Answer 1

如果您只是在resourcetype为1,2,3或4时减去100，则可以执行以下操作：

UPDATE resources
  SET resources.resourcecount = resources.resourcecount - 100
  WHERE resourcetype IN ('1', '2', '3', '4')

Answer 2

$updateSql = "UPDATE resources SET resources.resourcecount = resources.resourcecount - '100'
    WHERE resourcetype = '1';";

$updateSql .= "UPDATE resources SET resources.resourcecount = resources.resourcecount - '100'
    WHERE resourcetype = '2';";

mysqli_multi_query($link,$updateSql);

用单个mysql表的多语句更新多条记录？

2 个答案: