101 lines
3.7 KiB
PHP
101 lines
3.7 KiB
PHP
<?php defined("SYSPATH") or die("No direct script access.");
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/**
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* Gallery - a web based photo album viewer and editor
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* Copyright (C) 2000-2013 Bharat Mediratta
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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abstract class Database extends Database_Core {
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protected $_table_names;
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/**
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* Kohana 2.4 introduces a new connection parameter. If it's not specified, make sure that we
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* define it here to avoid an error later on.
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*
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* @todo: add an upgrade path to modify var/database.php so that we can avoid doing this at
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* runtime.
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*/
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protected function __construct(array $config) {
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if (!isset($config["connection"]["params"])) {
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$config["connection"]["params"] = null;
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}
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parent::__construct($config);
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if (gallery::show_profiler()) {
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$this->config['benchmark'] = true;
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}
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}
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/**
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* Parse the query string and convert any strings of the form `\([a-zA-Z0-9_]*?)\]
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* table prefix . $1
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*/
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public function query($sql) {
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if (!empty($sql)) {
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$sql = $this->add_table_prefixes($sql);
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}
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return parent::query($sql);
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}
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public function add_table_prefixes($sql) {
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$prefix = $this->config["table_prefix"];
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if (strpos($sql, "SHOW TABLES") === 0) {
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/*
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* Don't ignore "show tables", otherwise we could have a infinite
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* @todo this may have to be changed if we support more than mysql
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*/
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return $sql;
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} else if (strpos($sql, "CREATE TABLE") === 0) {
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// Creating a new table; add it to the table cache.
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$open_brace = strpos($sql, "{") + 1;
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$close_brace = strpos($sql, "}", $open_brace);
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$name = substr($sql, $open_brace, $close_brace - $open_brace);
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$this->_table_names["{{$name}}"] = "`{$prefix}$name`";
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} else if (strpos($sql, "RENAME TABLE") === 0) {
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// Renaming a table; add it to the table cache.
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// You must use the form "TO {new_table_name}" exactly for this to work.
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$open_brace = strpos($sql, "TO {") + 4;
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$close_brace = strpos($sql, "}", $open_brace);
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$name = substr($sql, $open_brace, $close_brace - $open_brace);
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$this->_table_names["{{$name}}"] = "`{$prefix}$name`";
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}
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if (!isset($this->_table_names)) {
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// This should only run once on the first query
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$this->_table_names = array();
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foreach($this->list_tables() as $table_name) {
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$this->_table_names["{{$table_name}}"] = "`{$prefix}{$table_name}`";
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}
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}
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return strtr($sql, $this->_table_names);
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}
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/**
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* This is used by the unit test code to switch the active database connection.
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*/
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static function set_default_instance($db) {
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self::$instances["default"] = $db;
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}
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/**
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* Escape LIKE queries, add wildcards. In MySQL queries using LIKE, _ and % characters are
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* treated as wildcards similar to ? and *, respectively. Therefore, we need to escape _, %,
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* and \ (the escape character itself).
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*/
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static function escape_for_like($value) {
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// backslash must go first to avoid double-escaping
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return addcslashes($value, '\_%');
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}
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} |