Can't return a result set in the given context

Question

When ever I try to call store procedure in mysql that sends back a result set, it keeps saying me that \"can\'t return a result set in the given context\".

I\'ve goo

Answer 1

I know this question is ancient, but for those still working with 5.2.4 and getting this error, you may consider creating a new mysql PDO object to work around this problem.

I still use 5.2.4 on my dev server to ensure backward compatibility for the WordPress plugins I develop.

Below is a wrapper around procedural calls that I use to successfully call procedures in both 5.2.4 (run on my dev server) , which would normally give me the error, and my production server (which runs a newer version that doesn't give the error) .

Its WordPress specific, but it wouldn't be difficult to modify it using straight php.

/*
* Need to cache connection so we don't keep creating connections till we hit max.
*/

private $_dbhCache=null; 

/**
     * mySQL Call Proc
     *
     * Provides a wrapper around calling a mySQL stored procedure to ensure against a 5.2.4 bug that 
     * causes procedure calls to fail.
     * Error:'can't return a result set in the given context'
     * 
     * references:
     * http://stackoverflow.com/questions/1200193/cant-return-a-result-set-in-the-given-context
     * http://php.net/pdo_mysql#69592  //i got empty result set but pointed me in the right direction
     * http://php.net/pdo_mysql#80306 //this worked, but returned 0-indexed and assoc, i edited it so it only returns assoc mimicking $wpdb->get_results(
     * http://www.php.net/manual/en/pdo.connections.php
     * http://www.php.net/manual/en/pdostatement.fetch.php explains about FETCH_ASSOC
     * 
     * @param string $proc The mySQL stored procedure string, including paramaters, but without the call statement. e.g.: "my_procedure_name('my_paramater')"; 
     * @return string The results of the procedure call
     */
    public function mySQLCallProc( $proc ) {
        global $wpdb;
        $query = "call $proc";

        try {

            /*
             * Attempt to call the procedure normally.
             * 
             */

            $query_result = $wpdb->get_results( $query, ARRAY_A );

            /*
             * Check for a database error
             * and throw an exception if one is found.
             * We can then attempt it again using a workaround.
             */

          if ( $wpdb->last_error !== '' ) { 



                throw new Exception( 'Database Error While Calling Procedure' );
}

        } catch ( Exception $e ) {

            try {

                /*
                 * Create a PDO Object for the connection
                 */
  if ( is_null($this->_dbhCache)) {
                    $dbh = new PDO( 'mysql:host=' . DB_HOST . ';port=' . DB_HOST . ';dbname=' . DB_NAME, DB_USER, DB_PASSWORD, array( PDO::ATTR_PERSISTENT => true ) );
 $this->_dbhCache=$dbh ;            
}else{
     $dbh = $this->_dbhCache;
}
                /*
                 * Prepare and call the procedure.
                 */
                $stmt = $dbh->prepare( "call $proc" );

                $stmt->execute();

                /*
                 *  fetch all rows into an associative array.
                 */

                $query_result = $stmt->fetchAll( PDO::FETCH_ASSOC ); //FETCH_ASSOC gets results as an assoc array. without it, you'll receive both assoc and 0-indexed array





    } catch ( PDOException $e ) {

                    print "Error!: " . $e->getMessage() . "
";
    die();

    }


    }

        return ($query_result);


    }