MySQL Error - Commands out of sync; you can't run this command now

Question

I am using MySQL with PHP, Codeigniter. I had a question which was answered by bluefeet in the post here

I created a stored procedure for the second solution by blue

Answer 1

Got the Answer! It seems like codeigniter's mysql driver has bugs handling stored procedures.

I changed the drivers from mysql to mysqli in the config/database file by changing

$db['default']['dbdriver'] = 'mysql';

to

$db['default']['dbdriver'] = 'mysqli';

Post that i modified the system/database/drivers/mysqli/mysqli_result.php file and added the below function

function next_result()
{
  if (is_object($this->conn_id))
  {
      return mysqli_next_result($this->conn_id);
  }
}

and modified the model as below

$db = $this->load->database('mailbox',TRUE);
$qry_res = $db->query('Call circle_pending_p()');

echo $db->_error_message();
$res = $qry_res->result_array();

$qry_res->next_result();
$qry_res->free_result();

if (count($res) > 0) {
      return $res;
} else {
      return 0;
}

This solved the problem!

Answer 2

I faced similary problem when I was running stored procedure in a loop. The below code I was using:

foreach ($month_list as $month_row) 
{

  $start_date = $month_row->adate;
  $end_date = date("Y-m-d", strtotime("last day of " . date("F", strtotime($start_date)) . " " . date("Y", strtotime($start_date))));

  $qry_res = $this->db->query("call staff_attendance('$start_date', '$end_date')");

  $res = $qry_res->result();

  $qry_res->next_result();
  $qry_res->free_result();

  $compiled_months[] = $res;

}

In this case the temporary table I created was being complained as table already exists.

So, used this approach instead:

foreach ($month_list as $month_row) 
{

  $start_date = $month_row->adate;
  $end_date = date("Y-m-d", strtotime("last day of " . date("F", strtotime($start_date)) . " " . date("Y", strtotime($start_date))));

  $compiled_months[] = $this->db->query("call staff_attendance('$start_date', '$end_date')")->result();
  $this->db->close();
  $this->db->initialize();

}

Now execution was perfect

Answer 3

Try:

<?php
while($dbms->more_results() && $dbms->next_result())
    {
        $result = $dbms->store_result();

        if(is_object($result)){ $result->free(); }

        unset($result);
    }
?>

After procedure call. MySQLi can't call another procedure, while has previous results. You should use free() for each of them before any further procedure call or query execution.

Source: http://php.net/manual/en/mysqli.query.php

Answer 4

In file

system/database/drivers/mysqli/mysqli_result.php

Add:

function next_result()
{
    if (is_object($this->conn_id))
    {
        return mysqli_next_result($this->conn_id);
    }
}

function result($type = 'object')
{
    $result = array();

    if ($type == 'array') $result = $this->result_array();
    else if ($type == 'object') $result = $this->result_object();
    else $result = $this->custom_result_object($type);

    $this->next_result();

    return $result;
}