INSERTING values from one table into another table

Question

I have this code to select all the fields from the \'jobseeker\' table and with it it\'s supposed to update the \'user\' table by setting the userType to \'admin\' where the

Answer 1

Firstly, never use SELECT * in some code: it will bite you (or whoever has to maintain this application) if the table structure changes (never say never).

You could consider using an INSERT that takes its values from a SELECT directly:

"INSERT INTO admin(userID, forename, ..., `password`, ...)
    SELECT userID, forename, ..., `password`, ...
    FROM jobseeker WHERE userID = ..."

You don't have to go via PHP to do this.

(Apologies for using an example above that relied on mysql_real_escape_string in an earlier version of this answer. Using mysql_real_escape_string is not a good idea, although it's probably marginally better than putting the parameter directly into the query string.)

I'm not sure which MySQL engine you're using, but your should consider doing those statements within a single transaction too (you would need InnoDB instead of MyISAM).

In addition, I would suggest using mysqli and prepared statements to be able to bind parameters: this is a much cleaner way not to have to escape the input values (so as to avoid SQL injection attacks).

EDIT 2:

(You might want to turn off the magic quotes if they're on.)

$userID = $_GET['userID'];

// Put the right connection parameters
$mysqli = new mysqli("localhost", "user", "password", "db");

if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

// Use InnoDB for your MySQL DB for this, not MyISAM.
$mysqli->autocommit(FALSE);

$query = "INSERT INTO admin(`userID`, `forename`, `surname`, `salt`, `password`, `profilePicture`)"
    ." SELECT `userID`, `forename`, `surname`, `salt`, `password`, `profilePicture` "
    ." FROM jobseeker WHERE userID=?";

if ($stmt = $mysqli->prepare($query)) {
    $stmt->bind_param('i', (int) $userID);
    $stmt->execute();
    $stmt->close();
} else {
    die($mysqli->error);
}

$query = "UPDATE user SET userType = 'admin' WHERE userID=?";

if ($stmt = $mysqli->prepare($query)) {
    $stmt->bind_param('i', (int) $userID);
    $stmt->execute();
    $stmt->close();
} else {
    die($mysqli->error);
}

$query = "DELETE FROM jobseeker WHERE userID=?";

if ($stmt = $mysqli->prepare($query)) {
    $stmt->bind_param('i', (int) $userID);
    $stmt->execute();
    $stmt->close();
} else {
    die($mysqli->error);
}

$mysqli->commit();

$mysqli->close();

EDIT 3: I hadn't realised your userID was an int (but that's probably what it is since you've said it's auto-incremented in a comment): cast it to an int and/or don't use it as a string (i.e. with quotes) in WHERE userID = '$userID' (but again, don't ever insert your variable directly in a query, whether read from the DB or a request parameter).