從表WHERE UID = x AND CAT = y中刪除

Question

我有一個非常簡單的表-3列ID | UID | 貓

我試圖運行mysql刪除以刪除其中UID =某物和CAT =某物的行。 但這是行不通的。 我該怎么做呢？

$uid = $_POST['UID'];
$cat = $_POST['CAT'];

mysql_query("DELETE FROM Categories WHERE UID = ".$uid." AND CAT=".$cat."");

Answer 1

嘗試這個：

mysql_query("DELETE FROM Categories WHERE UID = $uid AND CAT='$cat'");

Answer 2

$uid = $_POST['UID'];
$cat = $_POST['CAT'];

mysql_query("DELETE FROM Categories WHERE UID = ".$uid." AND CAT=".$cat."");

VARCHAR需要轉義

mysql_query("DELETE FROM Categories WHERE UID = ".$uid." AND CAT='".$cat."'");

另一個提示使用mysql_real_escape_string或另一種檢查用戶輸入的形式

$uid = mysql_real_escape_string($_POST['UID']);
$cat = mysql_real_escape_string($_POST['CAT']);

Answer 3

您有活動的數據庫連接嗎？ 如果不是，則需要在調用mysql_query()之前創建一個。

除此之外，您可能會忘記查詢中的單引號：

mysql_query("DELETE FROM Categories WHERE UID = ".$uid." AND CAT=".$cat."");

應該：

mysql_query("DELETE FROM Categories WHERE UID = ".$uid." AND CAT='".$cat."'");

假設CAT不是數字列。