[英]Why is my MySQLi query returning bool(false)?
Why is my MySQLi query returning bool(false)? 为什么我的MySQLi查询返回bool(false)?
require_once("LinkDB.php");
$noCommande = $_POST['noCommande'] ;
$req = "Delete From transactions Where no_Commande = ".$noCommande;
require 'config.php';
$connexion = LinkDB::get();
if (!$connexion)
{
}
if ($connexion)
{
$resultat = mysqli_query($connexion,$req) ;
var_dump($resultat);
var_dump($req);
}
As you can see in the documentation : 正如您在文档中所看到的:
Returns FALSE on failure. 失败时返回FALSE。 For successful SELECT, SHOW, DESCRIBE or EXPLAIN queries mysqli_query() will return a mysqli_result object. 对于成功的SELECT,SHOW,DESCRIBE或EXPLAIN查询,mysqli_query()将返回mysqli_result对象。 For other successful queries mysqli_query() will return TRUE. 对于其他成功的查询,mysqli_query()将返回TRUE。
For
DELETE
queries the return false if the query failed. 对于DELETE
查询,如果查询失败,则返回false。
So that indicates that your query has an error. 因此,这表明您的查询有错误。 Call mysqli_error($connexion));
调用mysqli_error($connexion));
to see the error message. 查看错误消息。
$noCommande
is string, it came from form. $noCommande
是字符串,它来自表单。 You forgot quotes around it. 您忘记了周围的引号。
$req = "Delete From transactions Where no_Commande = '" . $noCommande . "'";
Or, if you send a number in form, you can change variable type. 或者,如果您以表格形式发送数字,则可以更改变量类型。
$req = "Delete From transactions Where no_Commande = " . (int)$noCommande;
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