mirror of
https://github.com/Yetangitu/ampache
synced 2025-10-03 17:59:21 +02:00
442 lines
12 KiB
PHP
442 lines
12 KiB
PHP
<?php
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/*
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Copyright (c) Ampache.org
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All rights reserved.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License v2
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as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* Make sure they aren't directly accessing it */
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if (INIT_LOADED != '1') { exit; }
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/**
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* Dba
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* This is the database abstraction class
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* It duplicates the functionality of mysql_???
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* with a few exceptions, the row and assoc will always
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* return an array, simplifying checking on the far end
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* it will also auto-connect as needed, and has a default
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* database simplifying queries in most cases.
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*/
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class Dba {
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public static $stats = array('query'=>0);
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private static $_default_db;
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private static $_sql;
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private static $config;
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/**
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* constructor
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* This does nothing with the DBA class
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*/
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private function __construct() {
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// Rien a faire
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} // construct
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/**
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* query
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* This is the meat of the class this does a query, it emulates
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* The mysql_query function
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*/
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public static function query($sql) {
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// Run the query
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$resource = mysql_query($sql,self::dbh());
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debug_event('Query',$sql,'6');
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// Save the query, to make debug easier
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self::$_sql = $sql;
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self::$stats['query']++;
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// Do a little error checking here and try to recover from some forms of failure
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if (!$resource) {
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switch (mysql_errno(self::dbh())) {
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case '2006':
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case '2013':
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case '2055':
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debug_event('DBH','Lost connection to database server, trying to re-connect and hope nobody noticed','1');
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self::disconnect();
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// Try again
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$resource = mysql_query($sql,self::dbh());
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break;
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default:
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debug_event('DBH',mysql_error(self::dbh()) . ' ['. mysql_errno(self::dbh()) . ']','1');
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break;
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} // end switch on error #
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} // if failed query
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return $resource;
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} // query
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/**
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* read
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* This is a wrapper for query, it's so that in the future if we ever wanted
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* to split reads and writes we could
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*/
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public static function read($sql) {
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return self::query($sql);
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} // read
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/**
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* write
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* This is a wrapper for a write query, it is so that we can split out reads and
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* writes if we want to
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*/
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public static function write($sql) {
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return self::query($sql);
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} // write
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/**
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* escape
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* This runs a escape on a variable so that it can be safely inserted
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* into the sql
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*/
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public static function escape($var) {
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$string = mysql_real_escape_string($var,self::dbh());
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return $string;
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} // escape
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/**
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* fetch_assoc
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* This emulates the mysql_fetch_assoc and takes a resource result
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* we force it to always return an array, albit an empty one
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*/
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public static function fetch_assoc($resource) {
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$result = mysql_fetch_assoc($resource);
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if (!$result) {
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return array();
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}
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return $result;
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} // fetch_assoc
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/**
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* fetch_row
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* This emulates the mysql_fetch_row and takes a resource result
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* we force it to always return an array, albit an empty one
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*/
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public static function fetch_row($resource) {
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$result = mysql_fetch_row($resource);
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if (!$result) {
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return array();
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}
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return $result;
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} // fetch_row
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/**
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* num_rows
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* This emulates the mysql_num_rows function which is really
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* just a count of rows returned by our select statement, this
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* doesn't work for updates or inserts
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*/
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public static function num_rows($resource) {
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$result = mysql_num_rows($resource);
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if (!$result) {
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return '0';
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}
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return $result;
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} // num_rows
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/**
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* finish
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* This closes a result handle and clears the memory assoicated with it
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*/
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public static function finish($resource) {
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// Clear the result memory
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mysql_free_result($resource);
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} // finish
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/**
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* affected_rows
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* This emulates the mysql_affected_rows function
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*/
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public static function affected_rows($resource) {
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$result = mysql_affected_rows($resource);
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if (!$result) {
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return '0';
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}
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return $result;
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} // affected_rows
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/**
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* _connect
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* This connects to the database, used by the DBH function
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*/
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private static function _connect($db_name) {
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if (self::$_default_db == $db_name) {
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$username = Config::get('database_username');
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$hostname = Config::get('database_hostname');
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$password = Config::get('database_password');
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$database = Config::get('database_name');
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}
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else {
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// Do this later
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}
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$dbh = mysql_connect($hostname,$username,$password);
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if (!$dbh) { debug_event('Database','Error unable to connect to database' . mysql_error(),'1'); }
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$data = self::translate_to_mysqlcharset(Config::get('site_charset'));
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if (function_exists('mysql_set_charset')) {
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if (!$charset = mysql_set_charset($data['charset'],$dbh)) {
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debug_event('Database','Error unable to set MySQL Connection charset to ' . $data['charset'] . ' this may cause issues...','1');
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}
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}
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else {
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$sql = "SET NAMES " . mysql_real_escape_string($data['charset']);
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$charset = mysql_query($sql,$dbh);
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if (mysql_error($dbh)) { debug_event('Database','Error unable to set MySQL Connection charset to ' . $data['charset'] . ' using SET NAMES, you may have issues','1'); }
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}
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if (!$charset) { debug_event('Database','Error unable to set connection charset, function missing or set failed','1'); }
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$select_db = mysql_select_db($database,$dbh);
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if (!$select_db) { debug_event('Database','Error unable to select ' . $database . ' error ' . mysql_error(),'1'); }
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if (Config::get('sql_profiling')) {
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mysql_query('set profiling=1', $dbh);
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mysql_query('set profiling_history_size=50', $dbh);
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mysql_query('set query_cache_type=0', $dbh);
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}
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return $dbh;
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} // _connect
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/**
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* show_profile
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* This function is used for debug, helps with profiling
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*/
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public static function show_profile() {
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if (Config::get('sql_profiling')) {
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print '<br/>Profiling data: <br/>';
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$res = Dba::query('show profiles');
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print '<table>';
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while ($r = Dba::fetch_row($res)) {
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print '<tr><td>' . implode('</td><td>', $r) . '</td></tr>';
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}
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print '</table>';
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}
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} // show_profile
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/**
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* dbh
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* This is called by the class to return the database handle
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* for the specified database, if none is found it connects
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*/
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public static function dbh($database='') {
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if (!$database) { $database = self::$_default_db; }
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// Assign the Handle name that we are going to store
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$handle = 'dbh_' . $database;
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if (!is_resource(Config::get($handle))) {
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$dbh = self::_connect($database);
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Config::set($handle,$dbh,1);
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return $dbh;
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}
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else {
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return Config::get($handle);
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}
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} // dbh
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/**
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* disconnect
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* This nukes the dbh connection based, this isn't used very often...
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*/
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public static function disconnect($database='') {
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if (!$database) { $database = self::$_default_db; }
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$handle = 'dbh_' . $database;
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// Try to close it correctly
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mysql_close(Config::get($handle));
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// Nuke it
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Config::set($handle,false,1);
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return true;
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} // disconnect
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/**
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* insert_id
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* This emulates the mysql_insert_id function, it takes
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* an optional database target
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*/
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public static function insert_id() {
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$id = mysql_insert_id(self::dbh());
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return $id;
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} // insert_id
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/**
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* error
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* this returns the error of the db
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*/
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public static function error() {
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return mysql_error();
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} // error
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/**
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* auto_init
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* This is the auto init function it sets up the config class
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* and also sets the default database
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*/
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public static function _auto_init() {
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self::$_default_db = Config::get('database_name');
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return true;
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} // auto_init
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/**
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* translate_to_mysqlcharset
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* This translates the specified charset to a mysqlcharset, stupid ass mysql
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* demands that it's charset list is different!
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*/
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public static function translate_to_mysqlcharset($charset) {
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// MySQL translte real charset names into fancy smancy MySQL land names
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switch (strtoupper($charset)) {
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case 'CP1250':
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case 'WINDOWS-1250':
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$target_charset = 'cp1250';
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$target_collation = 'cp1250_general_ci';
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break;
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case 'ISO-8859':
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case 'ISO-8859-2':
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$target_charset = 'latin2';
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$target_collation = 'latin2_general_ci';
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break;
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case 'ISO-8859-1':
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case 'CP1252':
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case 'WINDOWS-1252':
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$target_charset = 'latin1';
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$target_collation = 'latin1_general_ci';
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break;
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case 'EUC-KR':
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$target_charset = 'euckr';
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$target_collation = 'euckr_korean_ci';
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break;
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case 'CP932':
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$target_charset = 'sjis';
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$target_collation = 'sjis_japanese_ci';
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break;
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case 'KOI8-U':
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$target_charset = 'koi8u';
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$target_collation = 'koi8u_general_ci';
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break;
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case 'KOI8-R':
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$target_charset = 'koi8r';
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$target_collation = 'koi8r_general_ci';
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break;
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default;
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case 'UTF-8':
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$target_charset = 'utf8';
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$target_collation = 'utf8_unicode_ci';
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break;
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} // end mysql charset translation
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return array('charset'=>$target_charset,'collation'=>$target_collation);
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} // translate_to_mysqlcharset
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/**
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* reset_db_charset
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* This cruises through the database and trys to set the charset to the current
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* site charset, this is an admin function that can be run by an administrator
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* this can mess up data if you switch between charsets that are not overlapping
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* a catalog verify must be re-run to correct them
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*/
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public static function reset_db_charset() {
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$translated_charset = self::translate_to_mysqlcharset(Config::get('site_charset'));
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$target_charset = $translated_charset['charset'];
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$target_collation = $translated_charset['collation'];
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// Alter the charset for the entire database
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$sql = "ALTER DATABASE `" . Config::get('database_name') . "` DEFAULT CHARACTER SET $target_charset COLLATE $target_collation";
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$db_results = Dba::query($sql);
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$sql = "SHOW TABLES";
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$db_results = Dba::query($sql);
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// Go through the tables!
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while ($row = Dba::fetch_row($db_results)) {
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$sql = "DESCRIBE `" . $row['0'] . "`";
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$describe_results = Dba::query($sql);
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// Change the tables default charset and colliation
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$sql = "ALTER TABLE `" . $row['0'] . "` DEFAULT CHARACTER SET $target_charset COLLATE $target_collation";
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$alter_table = Dba::query($sql);
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// Itterate through the columns of the table
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while ($table = Dba::fetch_assoc($describe_results)) {
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if (strstr($table['Type'],'varchar') OR strstr($table['Type'],'enum') OR strstr($table['Table'],'text')) {
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$sql = "ALTER TABLE `" . $row['0'] . "` MODIFY `" . $table['Field'] . "` " . $table['Type'] . " CHARACTER SET " . $target_charset;
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$charset_results = Dba::query($sql);
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if (!$charset_results) {
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debug_event('CHARSET','Unable to update the charset of ' . $table['Field'] . '.' . $table['Type'] . ' to ' . $target_charset,'3');
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} // if it fails
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} // if its a varchar
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} // end columns
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} // end tables
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} // reset_db_charset
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} // dba class
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?>
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