PHP调用MySQL存储过程并返回值的方法

mysql_query("set @mysqlvar=$pbpvar");

mysql> delimiter //
mysql> CREATE PROCEDURE employee_list (OUT param1 INT)
    -> BEGIN
    ->   SELECT COUNT() INTO param1 FROM t;
    -> END
    -> //
Query OK, 0 rows affected (0.00 sec)

<h1>Employee listing</h1>
<form method="post" >
<p>Enter Department ID:
<input type="text" name="dept_id" size="4">
<input type="submit" name="submit" value="submit"><p>
</form>
<?php
$hostname = "localhost";
$username = "root";
$password = "secret";
$database = "prod";
if (IsSet ($_POST['submit'])) {
     $dbh = new mysqli($hostname, $username, $password, $database);
     / check connection /
     if (mysqli_connect_errno()) {
          printf("Connect failed: %sn", mysqli_connect_error());
          exit ();
     }
     $dept_id = $_POST['dept_id'];
     if ($result_set = $dbh->query("call employee_list( $dept_id )")) {
          print ('<table border="1" width="30%"> <tr> '.
               '<td>Employee_id</td><td>Surname</td><td>Firstname</td></tr>');
          while ($row = $result_set->fetch_object()) {
               printf("<tr><td>%s</td><td>%s</td><td>%s</td></tr>n", 
                      $row->employee_id, $row->surname, $row->firstname);
          }
     } else {
          printf("<p>Error:%d (%s) %sn", mysqli_errno($dbh), 
                 mysqli_sqlstate($dbh), mysqli_error($dbh));
     }
     print ("</table> ");
     $dbh->close();
}
?>

$result_set = $dbh->query("call employee_list( $dept_id )")