Re: [PDO] Number of rows found by Select

So would it be possible to write a select() function to handle the wierdness? I'm attempting to write one but I'm getting buffered query errors. This function is part of a Database Manager class and is supposed to return a PDO::Statement with the number of rows being stored in a referenced paramater. Error: 'SQLSTATE[HY000]: General error: 2014 Cannot execute queries while other unbuffered queries are active. Consider using PDOStatement::fetchAll(). Alternatively, if your code is only ever going to run against mysql, you may enable query buffering by setting the PDO::MYSQL_ATTR_USE_BUFFERED_QUERY attribute.' in E:\Server\swi\qpf\mng\data.class.php:64 Stack trace: #0 E:\Server\swi\qpf\mng\data.class.php(64): PDOStatement->execute() #1 E:\Server\swi\www\db.php(13): DM::select('* FROM cdrs WHE...', 20, -1) #2 {main} thrown in E:\Server\swi\qpf\mng\data.class.php on line 64 Function: public static function select($sql, &$count = NULL, $limit = NULL) {

    $db = self::handle(); #Singleton method to create/retrieve db handle
    $buf = array(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE);

    $sql = 'SELECT '.(!is_null($count)?'SQL_CALC_FOUND_ROWS ':'').$sql;

    $stmt = $db->prepare($sql, $buf);
    $stmt->execute();

    if (!is_null($count)) {
        $rows = $db->prepare('SELECT found_rows() AS rows', $buf);
        $rows->execute(); #ERROR HERE
        $rows_array = $rows->fetch(PDO::FETCH_NUM);
        $rows->closeCursor();
        $count = $rows_array[0];

        if (!is_null($limit) && $count > $limit) {
            $count = $limt;
        }
    }

    return $stmt;

} Where am I going wrong here? Rob Micah Stevens wrote:

There's a function called 'found_rows()' function, so you could try issuing a query, then issuing a second one 'SELECT FOUND_ROWS();' and it should give the number of rows returned by the previous select. Here's details: http://dev.mysql.com/doc/refman/4.1/en/information-functions.html On Tuesday 08 November 2005 9:13 am, Micah Stevens wrote:

yeah, it would help if I read the whole post. Sorry. On Tuesday 08 November 2005 9:06 am, Dwight Altman wrote:

I suppose you could use "count( PDOStatement::fetchAll() )", but I understand your amazement. mysql_num_rows() is specific to MySQL. He wants a PDO version. -----Original Message----- From: Micah Stevens [mailto:micah@raincross-tech.com] Sent: Tuesday, November 08, 2005 10:51 AM To: php-db@lists.php.net Subject: Re: [PHP-DB] [PDO] Number of rows found by Select mysql_num_rows() On Tuesday 08 November 2005 5:17 am, Rob C wrote:

What is the recommended way to find the number of rows found by a SELECT query? PDOStatement::rowCount() doesn't work with MySQL and is a bit of a hack anyway. Doing a COUNT(*) before the SELECT is very hackish - the data could have changed and it's an extra query. What is there that's better than either of these? Is there any way to use COUNT(*) without risking data change, such as inside a transaction? I'm amazed that there is no mysql_num_rows() equivilent, I get the feeling that I'm missing something obvious. I can only presume there is some technical limitation that I'm not appreciating, if anyone can shed some light on this, I'd like to know. I'm new to both PDO and this mailing list, so please be gentle with me. I'm using PDO 1.0RC2, PHP 5.0.5 and MySQL 4.1.15. Rob

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