柱未發現：在MySQL

Question

1054的問題，我得到這個錯誤：

Column not found: 1054 

對於下面的代碼：

$username=$_SESSION['username']; 
$status="active"; 
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 
// run query to select records 
$stmt = $db->prepare("SELECT * FROM job INNER JOIN employer ON job.eid= employer.eid WHERE employer.username=$username AND job.status=active "); 
$stmt->execute(); 

我有兩個表，jobs和employer。我加入這兩個表並獲得結果基於username和status

Answer 1

您應該將變量$ username放在引號內。

$stmt = $db->prepare("SELECT * FROM job INNER JOIN employer ON job.eid= employer.eid WHERE employer.username = '".$username."' AND job.status= 'active'"); 

希望這會有所幫助。