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370 lines
8.0 KiB
PHP
370 lines
8.0 KiB
PHP
<?php
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/**
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*
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* @package dbal
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* @version $Id$
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* @copyright (c) 2005 phpBB Group
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* @license http://opensource.org/licenses/gpl-license.php GNU Public License
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*
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*/
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/**
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* @ignore
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*/
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if (!defined('IN_PHPBB'))
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{
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exit;
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}
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include_once($phpbb_root_path . 'includes/db/dbal.' . $phpEx);
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/**
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* Sqlite Database Abstraction Layer
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* Minimum Requirement: 2.8.2+
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* @package dbal
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*/
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class dbal_sqlite extends dbal
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{
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var $connect_error = '';
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/**
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* Connect to server
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*/
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function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
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{
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$this->persistency = $persistency;
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$this->user = $sqluser;
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$this->server = $sqlserver . (($port) ? ':' . $port : '');
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$this->dbname = $database;
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$error = '';
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if ($this->persistency)
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{
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if (!function_exists('sqlite_popen'))
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{
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$this->connect_error = 'sqlite_popen function does not exist, is sqlite extension installed?';
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return $this->sql_error('');
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}
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$this->db_connect_id = @sqlite_popen($this->server, 0666, $error);
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}
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else
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{
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if (!function_exists('sqlite_open'))
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{
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$this->connect_error = 'sqlite_open function does not exist, is sqlite extension installed?';
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return $this->sql_error('');
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}
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$this->db_connect_id = @sqlite_open($this->server, 0666, $error);
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}
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if ($this->db_connect_id)
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{
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@sqlite_query('PRAGMA short_column_names = 1', $this->db_connect_id);
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// @sqlite_query('PRAGMA encoding = "UTF-8"', $this->db_connect_id);
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}
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return ($this->db_connect_id) ? true : array('message' => $error);
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}
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/**
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* Version information about used database
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* @param bool $raw if true, only return the fetched sql_server_version
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* @param bool $use_cache if true, it is safe to retrieve the stored value from the cache
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* @return string sql server version
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*/
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function sql_server_info($raw = false, $use_cache = true)
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{
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global $cache;
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if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('sqlite_version')) === false)
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{
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$result = @sqlite_query('SELECT sqlite_version() AS version', $this->db_connect_id);
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$row = @sqlite_fetch_array($result, SQLITE_ASSOC);
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$this->sql_server_version = (!empty($row['version'])) ? $row['version'] : 0;
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if (!empty($cache) && $use_cache)
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{
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$cache->put('sqlite_version', $this->sql_server_version);
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}
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}
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return ($raw) ? $this->sql_server_version : 'SQLite ' . $this->sql_server_version;
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}
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/**
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* SQL Transaction
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* @access private
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*/
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function _sql_transaction($status = 'begin')
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{
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switch ($status)
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{
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case 'begin':
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return @sqlite_query('BEGIN', $this->db_connect_id);
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break;
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case 'commit':
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return @sqlite_query('COMMIT', $this->db_connect_id);
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break;
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case 'rollback':
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return @sqlite_query('ROLLBACK', $this->db_connect_id);
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break;
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}
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return true;
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}
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/**
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* Base query method
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*
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* @param string $query Contains the SQL query which shall be executed
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* @param int $cache_ttl Either 0 to avoid caching or the time in seconds which the result shall be kept in cache
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* @return mixed When casted to bool the returned value returns true on success and false on failure
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*
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* @access public
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*/
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function sql_query($query = '', $cache_ttl = 0)
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{
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if ($query != '')
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{
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global $cache;
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// EXPLAIN only in extra debug mode
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if (defined('DEBUG_EXTRA'))
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{
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$this->sql_report('start', $query);
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}
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$this->query_result = ($cache_ttl && method_exists($cache, 'sql_load')) ? $cache->sql_load($query) : false;
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$this->sql_add_num_queries($this->query_result);
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if ($this->query_result === false)
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{
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if (($this->query_result = @sqlite_query($query, $this->db_connect_id)) === false)
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{
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$this->sql_error($query);
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}
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if (defined('DEBUG_EXTRA'))
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{
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$this->sql_report('stop', $query);
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}
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if ($cache_ttl && method_exists($cache, 'sql_save'))
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{
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$this->open_queries[(int) $this->query_result] = $this->query_result;
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$cache->sql_save($query, $this->query_result, $cache_ttl);
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}
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else if (strpos($query, 'SELECT') === 0 && $this->query_result)
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{
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$this->open_queries[(int) $this->query_result] = $this->query_result;
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}
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}
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else if (defined('DEBUG_EXTRA'))
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{
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$this->sql_report('fromcache', $query);
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}
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}
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else
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{
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return false;
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}
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return $this->query_result;
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}
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/**
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* Build LIMIT query
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*/
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function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
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{
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$this->query_result = false;
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// if $total is set to 0 we do not want to limit the number of rows
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if ($total == 0)
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{
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$total = -1;
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}
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$query .= "\n LIMIT " . ((!empty($offset)) ? $offset . ', ' . $total : $total);
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return $this->sql_query($query, $cache_ttl);
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}
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/**
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* Return number of affected rows
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*/
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function sql_affectedrows()
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{
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return ($this->db_connect_id) ? @sqlite_changes($this->db_connect_id) : false;
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}
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/**
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* Fetch current row
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*/
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function sql_fetchrow($query_id = false)
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{
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global $cache;
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if ($query_id === false)
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{
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$query_id = $this->query_result;
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}
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if (isset($cache->sql_rowset[$query_id]))
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{
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return $cache->sql_fetchrow($query_id);
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}
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return ($query_id !== false) ? @sqlite_fetch_array($query_id, SQLITE_ASSOC) : false;
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}
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/**
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* Seek to given row number
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* rownum is zero-based
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*/
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function sql_rowseek($rownum, &$query_id)
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{
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global $cache;
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if ($query_id === false)
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{
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$query_id = $this->query_result;
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}
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if (isset($cache->sql_rowset[$query_id]))
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{
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return $cache->sql_rowseek($rownum, $query_id);
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}
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return ($query_id !== false) ? @sqlite_seek($query_id, $rownum) : false;
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}
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/**
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* Get last inserted id after insert statement
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*/
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function sql_nextid()
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{
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return ($this->db_connect_id) ? @sqlite_last_insert_rowid($this->db_connect_id) : false;
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}
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/**
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* Free sql result
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*/
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function sql_freeresult($query_id = false)
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{
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global $cache;
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if ($query_id === false)
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{
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$query_id = $this->query_result;
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}
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if (isset($cache->sql_rowset[$query_id]))
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{
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return $cache->sql_freeresult($query_id);
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}
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return true;
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}
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/**
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* Escape string used in sql query
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*/
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function sql_escape($msg)
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{
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return @sqlite_escape_string($msg);
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}
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/**
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* Correctly adjust LIKE expression for special characters
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* For SQLite an underscore is a not-known character... this may change with SQLite3
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*/
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function sql_like_expression($expression)
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{
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// Unlike LIKE, GLOB is case sensitive (unfortunatly). SQLite users need to live with it!
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// We only catch * and ? here, not the character map possible on file globbing.
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$expression = str_replace(array(chr(0) . '_', chr(0) . '%'), array(chr(0) . '?', chr(0) . '*'), $expression);
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$expression = str_replace(array('?', '*'), array("\?", "\*"), $expression);
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$expression = str_replace(array(chr(0) . "\?", chr(0) . "\*"), array('?', '*'), $expression);
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return 'GLOB \'' . $this->sql_escape($expression) . '\'';
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}
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/**
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* return sql error array
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* @access private
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*/
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function _sql_error()
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{
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if (function_exists('sqlite_error_string'))
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{
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$error = array(
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'message' => @sqlite_error_string(@sqlite_last_error($this->db_connect_id)),
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'code' => @sqlite_last_error($this->db_connect_id),
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);
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}
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else
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{
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$error = array(
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'message' => $this->connect_error,
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'code' => '',
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);
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}
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return $error;
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}
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/**
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* Build db-specific query data
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* @access private
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*/
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function _sql_custom_build($stage, $data)
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{
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return $data;
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}
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/**
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* Close sql connection
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* @access private
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*/
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function _sql_close()
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{
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return @sqlite_close($this->db_connect_id);
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}
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/**
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* Build db-specific report
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* @access private
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*/
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function _sql_report($mode, $query = '')
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{
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switch ($mode)
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{
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case 'start':
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break;
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case 'fromcache':
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$endtime = explode(' ', microtime());
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$endtime = $endtime[0] + $endtime[1];
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$result = @sqlite_query($query, $this->db_connect_id);
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while ($void = @sqlite_fetch_array($result, SQLITE_ASSOC))
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{
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// Take the time spent on parsing rows into account
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}
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$splittime = explode(' ', microtime());
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$splittime = $splittime[0] + $splittime[1];
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$this->sql_report('record_fromcache', $query, $endtime, $splittime);
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break;
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}
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}
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}
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?>
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