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<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2013 Bharat Mediratta
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*/
abstract class Database extends Database_Core {
protected $_table_names;
/**
* Kohana 2.4 introduces a new connection parameter. If it's not specified, make sure that we
* define it here to avoid an error later on.
*
* @todo: add an upgrade path to modify var/database.php so that we can avoid doing this at
* runtime.
*/
protected function __construct(array $config) {
if (!isset($config["connection"]["params"])) {
$config["connection"]["params"] = null;
}
parent::__construct($config);
if (gallery::show_profiler()) {
$this->config['benchmark'] = true;
}
}
/**
* Parse the query string and convert any strings of the form `\([a-zA-Z0-9_]*?)\]
* table prefix . $1
*/
public function query($sql) {
if (!empty($sql)) {
$sql = $this->add_table_prefixes($sql);
}
return parent::query($sql);
}
public function add_table_prefixes($sql) {
$prefix = $this->config["table_prefix"];
if (strpos($sql, "SHOW TABLES") === 0) {
/*
* Don't ignore "show tables", otherwise we could have a infinite
* @todo this may have to be changed if we support more than mysql
*/
return $sql;
} else if (strpos($sql, "CREATE TABLE") === 0) {
// Creating a new table; add it to the table cache.
$open_brace = strpos($sql, "{") + 1;
$close_brace = strpos($sql, "}", $open_brace);
$name = substr($sql, $open_brace, $close_brace - $open_brace);
$this->_table_names["{{$name}}"] = "`{$prefix}$name`";
} else if (strpos($sql, "RENAME TABLE") === 0) {
// Renaming a table; add it to the table cache.
// You must use the form "TO {new_table_name}" exactly for this to work.
$open_brace = strpos($sql, "TO {") + 4;
$close_brace = strpos($sql, "}", $open_brace);
$name = substr($sql, $open_brace, $close_brace - $open_brace);
$this->_table_names["{{$name}}"] = "`{$prefix}$name`";
}
if (!isset($this->_table_names)) {
// This should only run once on the first query
$this->_table_names = array();
foreach($this->list_tables() as $table_name) {
$this->_table_names["{{$table_name}}"] = "`{$prefix}{$table_name}`";
}
}
return strtr($sql, $this->_table_names);
}
/**
* This is used by the unit test code to switch the active database connection.
*/
static function set_default_instance($db) {
self::$instances["default"] = $db;
}
}
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