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<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2009 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.
*/
class Database extends Database_Core {
protected $_table_names;
public function open_paren() {
$this->where[] = "(";
return $this;
}
public function close_paren() {
// Search backwards for the last opening paren and resolve it
$i = count($this->where) - 1;
$this->where[$i] .= ")";
while (--$i >= 0) {
if ($this->where[$i] == "(") {
// Remove the paren from the where clauses, and add it to the right of the operator of the
// next where clause. If removing the paren makes the next where clause the first element
// in the where list, then the operator shouldn't be there. It's there because we
// calculate whether or not we need an operator based on the number of where clauses, and
// the open paren seems like a where clause even though it isn't.
array_splice($this->where, $i, 1);
$this->where[$i] = preg_replace("/^(AND|OR) /", $i ? "\\1 (" : "(", $this->where[$i]);
return $this;
}
}
throw new Kohana_Database_Exception('database.missing_open_paren');
}
/**
* 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";
}
if (!isset($this->_table_names)) {
// This should only run once on the first query
$this->_table_names =array();
$len = strlen($prefix);
foreach($this->list_tables() as $table_name) {
if ($len > 0) {
$naked_name = strpos($table_name, $prefix) !== 0 ?
$table_name : substr($table_name, $len);
} else {
$naked_name = $table_name;
}
$this->_table_names["{{$naked_name}}"] = $table_name;
}
}
return empty($this->_table_names) ? $sql : strtr($sql, $this->_table_names);
}
}
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