mysql获取名称的ID

Question

Hello i have a Database like this:

ID Name Password
1  Hans  *****

Now when I login I get the PHP Session of the Name.

Now I want to get the ID of the I entered Name in the Login and saved in the NameSession, and save it to a SESSION too.

I have searched in the Internet because its looks not so hard, but I havent found anything .

This is my Code so far.

$sql = "SELECT * FROM login WHERE Login='".$loginname."' and Password = '".$loginpassword."'";
$result = mysql_query($sql);
if (mysql_num_rows($result)>0) { //...wenn ein Datensatz mit diesem Nicknamen gefunden wurde:
    echo "Willkommen ".$loginname; //Fehlermeldung

    //Session registieren
    $_SESSION['loginname'] = $loginname;
    $_SESSION['UserID'] = $User_ID;

    //Text ausgeben
header('Location: home.php');
exit();  
}

Answer 1

To fetch the corresponding id of the particular record. Assuming that your table structure is ID Name Password as you mentioned in your question. According to which your SQL query should rather be like:

"SELECT * FROM login WHERE Name ='".$loginname."' and Password = '".$loginpassword."'";

Change this:

if (mysql_num_rows($result)>0) { //...wenn ein Datensatz mit diesem Nicknamen gefunden wurde:
    echo "Willkommen ".$loginname;

to this:

if (mysql_num_rows($result)>0) { //...wenn ein Datensatz mit diesem Nicknamen gefunden wurde:
  $row = mysql_fetch_array($result);
    echo $row['ID'];

  //saving the id and username in sessions
  $_SESSION['loginname'] = $loginname;
  $_SESSION['UserID'] = $row['ID'];

Note: This is still bad practice, Kindly study mysqli or PDO .

PHP Manual: MySQL Improved Extension

PHP Manual: PHP Data Objects

Answer 2

change

$_SESSION['UserID'] = $User_ID;

to

$_SESSION['UserID'] = $result['ID'];

or if you had included explode($result) after the sql query, the $ID variable would be available.

This is with the assumption that only 1 row has been returned from your query, you may want to perform a loop the $result array (all returned rows), depending on how far you want to go with the login workflow.