[英]How to insert a php variable in an sql query? Mistake in my query?
我寫了這個簡單的代碼來從sql表中刪除一個博客。 但它給出了一個錯誤
Could not delete data: Unknown column '$qid' in 'where clause'
不明白為什么。 $qid
是變量,而qid
是列名,它給我這個錯誤。
<?php
$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = '';
$conn = mysql_connect($dbhost, $dbuser, $dbpass);
mysql_select_db('trial1');
if(! $conn )
{
die('Could not connect: ' . mysql_error());
}
function check_login(){
return 12;
}
$return_array = array();
if( check_login()!=NULL){
$qid =1;
$sql='DELETE FROM blog_post WHERE qid = $qid';
$retval = mysql_query($sql, $conn);
if (!$retval){
die('Could not delete data: ' . mysql_error());
$return_array["success"] = 0; //If deletion unsuccessful
echo json_encode($return_array);
}
else{
$return_array["success"]=1; //If deletion successful
echo json_encode($return_array);
}
}
?>
您應該使用單引號將輸入包裝在sql中:
$sql="DELETE FROM `blog_post` WHERE `qid` = '$qid'";
首先,您需要確保表中有列名qid 。
然后嘗試:
$sql='DELETE FROM blog_post WHERE qid ='.$qid;
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