Question

I have a query that checks a database for a match against the input of a username and password, the corresponding values of this query would be either 0 (no match) or 1 (a match). This would output in a column (itDoesExist) with one value, either the 1 or the 0.

What I would like to know, is how do I get that value in PHP? I guess I am missing something here and I cant quite seem to figure out what that is.

Here is the code:

$stmt = $link->prepare("
    SELECT CASE WHEN
    EXISTS (

    SELECT 1
    FROM user_details
    INNER JOIN user_info 
        ON user_details.id = user_info.id
    WHERE user_info.emailContact = ?
    AND user_details.password = ?
    )
    OR EXISTS (

    SELECT 1
    FROM user_details
    INNER JOIN user_business_info 
        ON user_details.id = user_business_info.id
    WHERE user_business_info.emailContact = ?
    AND user_details.password = ?
    )
    THEN 1
    ELSE 0
    END AS itDoesExist
");

if (!$stmt)
{
    $error = "{$link->errno}  :  {$link->error} (Error Searching For User)";
    include "C:/wamp/www/includes/html/main/error.html.php";
    exit();
}
if (!$stmt->bind_param("ssss", $username, $password, $username, $password))
{
    $error = "{$stmt->errno}  :  {$stmt->error}";
    include "C:/wamp/www/includes/html/main/error.html.php";
    exit();
}
if (!$stmt->execute())
{
    $error = "{$stmt->errno}  :  {$stmt->error} (Cant execute?)";
    include "C:/wamp/www/includes/html/main/error.html.php";
    exit();
}

Thanks in advance for any help or information in this regard!

Answer 1

If you are looking for the result of query you can use bind_result and fetch, see the example on the prepare statement

$stmt->bind_result($itDoesExist);
$stmt->fetch();

if ($itDoesExist == 1)
{
    /* Handle the exists case */
}