php - 无法在数据库表中插入值

Question

我正在尝试在数据库中插入值，但无法做到这一点

<?php
if(isset($_POST['submit']))
{
$fullname=$_POST['fullname'];
$contactnumber=$_POST['contactnumber'];
$email=$_POST['email'];
$qualification=$_POST['qualification'];
$postappliedfor=$_POST['postappliedfor'];
$sql_connection=mysql_connect("localhost","root","admin","interview");
mysql_select_db("interview,$sql_connection") or die("cannot select DB");
$sql=mysql_query("INSERT INTO `USERDEATILS`(`id`,`fullname`,`contactnumber`,`email`,`qualification`,`postappliedfor`) VALUES('','$fullname','$contactnumber','$email','$qualification','$postappliedfor')");
if($sql){
        echo "done";
    }
    else{
        echo "There is an error!!"; 
    }
}


?>

Answer 1

换行 mysql_select_db("面试,$sql_connection")

至

mysql_select_db("面试", $sql_connection)