<?php // -*-php-*-
// rcs_id('$Id: PDO_mysql.php 7641 2010-08-11 13:00:46Z vargenau $');

/*
 * Copyright 2005 $ThePhpWikiProgrammingTeam
 *
 * This file is part of PhpWiki.
 *
 * PhpWiki is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * PhpWiki is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with PhpWiki; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/**
 * @author: Reini Urban
 */
require_once('lib/WikiDB/backend/PDO.php');

class WikiDB_backend_PDO_mysql
extends WikiDB_backend_PDO
{
    function WikiDB_backend_PDO_mysql($dbparams) {

        $this->WikiDB_backend_PDO($dbparams);

        if (!empty($this->_serverinfo['version'])) {
            $arr = explode('.', $this->_serverinfo['version']);
            $this->_serverinfo['version'] = (string)(($arr[0] * 100) + $arr[1]) . "." . (integer)$arr[2];
        }
        if ($this->_serverinfo['version'] < 323.0) {
            // Older MySQL's don't have CASE WHEN ... END
            $this->_expressions['maxmajor'] = "MAX(IF(minor_edit=0,version,0))";
            $this->_expressions['maxminor'] = "MAX(IF(minor_edit<>0,version,0))";
        }

        if ($this->_serverinfo['version'] > 401.0) {
            global $charset;
            $aliases = array('iso-8859-1' => 'latin1',
                             'utf-8'      => 'utf8');
            //http://dev.mysql.com/doc/mysql/en/charset-connection.html
            if (isset($aliases[strtolower($charset)])) {
                // mysql needs special unusual names and doesn't resolve aliases
                mysql_query("SET NAMES '". $aliases[$charset] . "'");
            } else {
                mysql_query("SET NAMES '$charset'");
            }
        }
    }

    function backendType() {
        return 'mysql';
    }

    /**
     * Kill timed out processes. ( so far only called on about every 50-th save. )
     */
    function _timeout() {
    	if (empty($this->_dbparams['timeout'])) return;
	$sth = $this->_dbh->prepare("SHOW processlist");
        if ($sth->execute())
	  while ($row = $sth->fetch(PDO_FETCH_ASSOC)) {
	    if ($row["db"] == $this->_dsn['database']
	        and $row["User"] == $this->_dsn['username']
	        and $row["Time"] > $this->_dbparams['timeout']
	        and $row["Command"] == "Sleep")
            {
                $process_id = $row["Id"];
                $this->query("KILL $process_id");
	    }
	}
    }

    /**
     * Pack tables.
     */
    function optimize() {
        $dbh = &$this->_dbh;
        $this->_timeout();
        foreach ($this->_table_names as $table) {
            $this->query("OPTIMIZE TABLE $table");
        }
        return 1;
    }

    function listOfTables() {
        $sth = $this->_dbh->prepare("SHOW TABLES");
        $sth->execute();
        $tables = array();
        while ($row = $sth->fetch(PDO_FETCH_NUM)) { $tables[] = $row[0]; }
        return $tables;
    }

    function listOfFields($database, $table) {
        $old_db = $this->database();
        if ($database != $old_db) {
            try {
                $dsn = preg_replace("/dbname=\w+;/", "dbname=".$database, $this->_dsn);
                $dsn = preg_replace("/database=\w+;/", "database=".$database, $dsn);
                $conn = new PDO($dsn,
                                DBADMIN_USER ? DBADMIN_USER : $this->_parsedDSN['username'],
                                DBADMIN_PASSWD ? DBADMIN_PASSWD : $this->_parsedDSN['password']);
            }
            catch (PDOException $e) {
                echo "<br>\nDB Connection failed: " . $e->getMessage();
                echo "<br>\nDSN: '", $this->_dsn, "'";
                echo "<br>\n_parsedDSN: '", print_r($this->_parsedDSN), "'";
                $conn = $this->_dbh;
            }
        } else {
            $conn = $this->_dbh;
        }
        $sth = $conn->prepare("SHOW COLUMNS FROM $table");
        $sth->execute();
        $field_list = array();
        while ($row = $sth->fetch(PDO_FETCH_NUM)) {
            $field_list[] = $row[0];
        }
        if ($database != $old_db) {
            unset($conn);
        }
        return $field_list;
    }

    /*
     * offset specific syntax within mysql
     * convert from,count to SQL "LIMIT $offset, $count"
     */
    function _limit_sql($limit = false) {
        if ($limit) {
            list($offset, $count) = $this->limit($limit);
            if ($offset)
                // pgsql needs "LIMIT $count OFFSET $from"
                $limit = " LIMIT $offset, $count";
            else
                $limit = " LIMIT $count";
        } else
            $limit = '';
        return $limit;
    }

}

// Local Variables:
// mode: php
// tab-width: 8
// c-basic-offset: 4
// c-hanging-comment-ender-p: nil
// indent-tabs-mode: nil
// End:
?>
