rcube_mdb2.php
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	<?php

	/*
	+-----------------------------------------------------------------------+
	\| program/include/rcube_mdb2.php \|
	\| \|
	\| This file is part of the RoundCube Webmail client \|
	\| Copyright (C) 2005-2009, RoundCube Dev. - Switzerland \|
	\| Licensed under the GNU GPL \|
	\| \|
	\| PURPOSE: \|
	\| PEAR:DB wrapper class that implements PEAR MDB2 functions \|
	\| See http://pear.php.net/package/MDB2 \|
	\| \|
	+-----------------------------------------------------------------------+
	\| Author: Lukas Kahwe Smith <smith@pooteeweet.org> \|
	+-----------------------------------------------------------------------+

	$Id$

	*/


	/**
	* Database independent query interface
	*
	* This is a wrapper for the PEAR::MDB2 class
	*
	* @package Database
	* @author David Saez Padros <david@ols.es>
	* @author Thomas Bruederli <roundcube@gmail.com>
	* @author Lukas Kahwe Smith <smith@pooteeweet.org>
	* @version 1.16
	* @link http://pear.php.net/package/MDB2
	*/
	class rcube_mdb2
	{
	var $db_dsnw; // DSN for write operations
	var $db_dsnr; // DSN for read operations
	var $db_connected = false; // Already connected ?
	var $db_mode = ''; // Connection mode
	var $db_handle = 0; // Connection handle
	var $db_error = false;
	var $db_error_msg = '';
	var $debug_mode = false;

	var $a_query_results = array('dummy');
	var $last_res_id = 0;

	private $tables;


	/**
	* Object constructor
	*
	* @param string DSN for read/write operations
	* @param string Optional DSN for read only operations
	*/
	function __construct($db_dsnw, $db_dsnr='', $pconn=false)
	{
	if ($db_dsnr=='')
	$db_dsnr=$db_dsnw;

	$this->db_dsnw = $db_dsnw;
	$this->db_dsnr = $db_dsnr;
	$this->db_pconn = $pconn;

	$dsn_array = MDB2::parseDSN($db_dsnw);
	$this->db_provider = $dsn_array['phptype'];
	}


	/**
	* Connect to specific database
	*
	* @param string DSN for DB connections
	* @return object PEAR database handle
	* @access private
	*/
	function dsn_connect($dsn)
	{
	// Use persistent connections if available
	$db_options = array(
	'persistent' => $this->db_pconn,
	'emulate_prepared' => $this->debug_mode,
	'debug' => $this->debug_mode,
	'debug_handler' => 'mdb2_debug_handler',
	'portability' => MDB2_PORTABILITY_ALL ^ MDB2_PORTABILITY_EMPTY_TO_NULL);

	if ($this->db_provider == 'pgsql') {
	$db_options['disable_smart_seqname'] = true;
	$db_options['seqname_format'] = '%s';
	}

	$dbh = MDB2::connect($dsn, $db_options);

	if (MDB2::isError($dbh))
	{
	$this->db_error = TRUE;
	$this->db_error_msg = $dbh->getMessage();

	raise_error(array('code' => 500, 'type' => 'db', 'line' => __LINE__,
	'file' => __FILE__, 'message' => $dbh->getUserInfo()), TRUE, FALSE);
	}
	else if ($this->db_provider=='sqlite')
	{
	$dsn_array = MDB2::parseDSN($dsn);
	if (!filesize($dsn_array['database']) && !empty($this->sqlite_initials))
	$this->_sqlite_create_database($dbh, $this->sqlite_initials);
	}
	else if ($this->db_provider!='mssql' && $this->db_provider!='sqlsrv')
	$dbh->setCharset('utf8');

	return $dbh;
	}


	/**
	* Connect to appropiate databse
	* depending on the operation
	*
	* @param string Connection mode (r\|w)
	* @access public
	*/
	function db_connect($mode)
	{
	$this->db_mode = $mode;

	// Already connected
	if ($this->db_connected)
	{
	// no replication, current connection is ok
	if ($this->db_dsnw==$this->db_dsnr)
	return;

	// connected to master, current connection is ok
	if ($this->db_mode=='w')
	return;

	// Same mode, current connection is ok
	if ($this->db_mode==$mode)
	return;
	}

	if ($mode=='r')
	$dsn = $this->db_dsnr;
	else
	$dsn = $this->db_dsnw;

	$this->db_handle = $this->dsn_connect($dsn);
	$this->db_connected = true;
	}


	/**
	* Activate/deactivate debug mode
	*
	* @param boolean True if SQL queries should be logged
	*/
	function set_debug($dbg = true)
	{
	$this->debug_mode = $dbg;
	if ($this->db_connected)
	{
	$this->db_handle->setOption('debug', $dbg);
	$this->db_handle->setOption('emulate_prepared', $dbg);
	}
	}


	/**
	* Getter for error state
	*
	* @param boolean True on error
	*/
	function is_error()
	{
	return $this->db_error ? $this->db_error_msg : FALSE;
	}


	/**
	* Connection state checker
	*
	* @param boolean True if in connected state
	*/
	function is_connected()
	{
	return PEAR::isError($this->db_handle) ? false : true;
	}


	/**
	* Execute a SQL query
	*
	* @param string SQL query to execute
	* @param mixed Values to be inserted in query
	* @return number Query handle identifier
	* @access public
	*/
	function query()
	{
	if (!$this->is_connected())
	return NULL;

	$params = func_get_args();
	$query = array_shift($params);

	return $this->_query($query, 0, 0, $params);
	}


	/**
	* Execute a SQL query with limits
	*
	* @param string SQL query to execute
	* @param number Offset for LIMIT statement
	* @param number Number of rows for LIMIT statement
	* @param mixed Values to be inserted in query
	* @return number Query handle identifier
	* @access public
	*/
	function limitquery()
	{
	$params = func_get_args();
	$query = array_shift($params);
	$offset = array_shift($params);
	$numrows = array_shift($params);

	return $this->_query($query, $offset, $numrows, $params);
	}


	/**
	* Execute a SQL query with limits
	*
	* @param string SQL query to execute
	* @param number Offset for LIMIT statement
	* @param number Number of rows for LIMIT statement
	* @param array Values to be inserted in query
	* @return number Query handle identifier
	* @access private
	*/
	function _query($query, $offset, $numrows, $params)
	{
	// Read or write ?
	if (strtolower(substr(trim($query),0,6))=='select')
	$mode='r';
	else
	$mode='w';

	$this->db_connect($mode);

	if ($this->db_provider == 'sqlite')
	$this->_sqlite_prepare();

	if ($numrows \|\| $offset)
	$result = $this->db_handle->setLimit($numrows,$offset);

	if (empty($params))
	$result = $mode=='r' ? $this->db_handle->query($query) : $this->db_handle->exec($query);
	else
	{
	$params = (array)$params;
	$q = $this->db_handle->prepare($query, null, $mode=='w' ? MDB2_PREPARE_MANIP : null);
	if ($this->db_handle->isError($q))
	{
	$this->db_error = TRUE;
	$this->db_error_msg = $q->userinfo;

	raise_error(array('code' => 500, 'type' => 'db',
	'line' => __LINE__, 'file' => __FILE__,
	'message' => $this->db_error_msg), TRUE, TRUE);
	}
	else
	{
	$result = $q->execute($params);
	$q->free();
	}
	}

	// add result, even if it's an error
	return $this->_add_result($result);
	}


	/**
	* Get number of rows for a SQL query
	* If no query handle is specified, the last query will be taken as reference
	*
	* @param number Optional query handle identifier
	* @return mixed Number of rows or FALSE on failure
	* @access public
	*/
	function num_rows($res_id=NULL)
	{
	if (!$this->db_handle)
	return FALSE;

	if ($result = $this->_get_result($res_id))
	return $result->numRows();
	else
	return FALSE;
	}


	/**
	* Get number of affected rows for the last query
	*
	* @param number Optional query handle identifier
	* @return mixed Number of rows or FALSE on failure
	* @access public
	*/
	function affected_rows($res_id = null)
	{
	if (!$this->db_handle)
	return FALSE;

	return (int) $this->_get_result($res_id);
	}


	/**
	* Get last inserted record ID
	* For Postgres databases, a sequence name is required
	*
	* @param string Table name (to find the incremented sequence)
	* @return mixed ID or FALSE on failure
	* @access public
	*/
	function insert_id($table = '')
	{
	if (!$this->db_handle \|\| $this->db_mode=='r')
	return FALSE;

	if ($table) {
	if ($this->db_provider == 'pgsql')
	// find sequence name
	$table = get_sequence_name($table);
	else
	// resolve table name
	$table = get_table_name($table);
	}

	$id = $this->db_handle->lastInsertID($table);

	return $this->db_handle->isError($id) ? null : $id;
	}


	/**
	* Get an associative array for one row
	* If no query handle is specified, the last query will be taken as reference
	*
	* @param number Optional query handle identifier
	* @return mixed Array with col values or FALSE on failure
	* @access public
	*/
	function fetch_assoc($res_id=NULL)
	{
	$result = $this->_get_result($res_id);
	return $this->_fetch_row($result, MDB2_FETCHMODE_ASSOC);
	}


	/**
	* Get an index array for one row
	* If no query handle is specified, the last query will be taken as reference
	*
	* @param number Optional query handle identifier
	* @return mixed Array with col values or FALSE on failure
	* @access public
	*/
	function fetch_array($res_id=NULL)
	{
	$result = $this->_get_result($res_id);
	return $this->_fetch_row($result, MDB2_FETCHMODE_ORDERED);
	}


	/**
	* Get col values for a result row
	*
	* @param object Query result handle
	* @param number Fetch mode identifier
	* @return mixed Array with col values or FALSE on failure
	* @access private
	*/
	function _fetch_row($result, $mode)
	{
	if ($result === FALSE \|\| PEAR::isError($result) \|\| !$this->is_connected())
	return FALSE;

	return $result->fetchRow($mode);
	}


	/**
	* Wrapper for the SHOW TABLES command
	*
	* @return array List of all tables of the current database
	*/
	function list_tables()
	{
	// get tables if not cached
	if (!$this->tables) {
	$this->db_handle->loadModule('Manager');
	if (!PEAR::isError($result = $this->db_handle->listTables()))
	$this->tables = $result;
	else
	$this->tables = array();
	}

	return $this->tables;
	}


	/**
	* Formats input so it can be safely used in a query
	*
	* @param mixed Value to quote
	* @return string Quoted/converted string for use in query
	* @access public
	*/
	function quote($input, $type = null)
	{
	// create DB handle if not available
	if (!$this->db_handle)
	$this->db_connect('r');

	// escape pear identifier chars
	$rep_chars = array('?' => '\?',
	'!' => '\!',
	'&' => '\&');

	return $this->db_handle->quote($input, $type);
	}


	/**
	* Quotes a string so it can be safely used as a table or column name
	*
	* @param string Value to quote
	* @return string Quoted string for use in query
	* @deprecated Replaced by rcube_MDB2::quote_identifier
	* @see rcube_mdb2::quote_identifier
	* @access public
	*/
	function quoteIdentifier($str)
	{
	return $this->quote_identifier($str);
	}


	/**
	* Quotes a string so it can be safely used as a table or column name
	*
	* @param string Value to quote
	* @return string Quoted string for use in query
	* @access public
	*/
	function quote_identifier($str)
	{
	if (!$this->db_handle)
	$this->db_connect('r');

	return $this->db_handle->quoteIdentifier($str);
	}

	/**
	* Escapes a string
	*
	* @param string The string to be escaped
	* @return string The escaped string
	* @access public
	* @since 0.1.1
	*/
	function escapeSimple($str)
	{
	if (!$this->db_handle)
	$this->db_connect('r');

	return $this->db_handle->escape($str);
	}


	/**
	* Return SQL function for current time and date
	*
	* @return string SQL function to use in query
	* @access public
	*/
	function now()
	{
	switch($this->db_provider)
	{
	case 'mssql':
	case 'sqlsrv':
	return "getdate()";

	default:
	return "now()";
	}
	}


	/**
	* Return list of elements for use with SQL's IN clause
	*
	* @param string Input array
	* @return string Elements list string
	* @access public
	*/
	function array2list($arr, $type=null)
	{
	if (!is_array($arr))
	return $this->quote($arr, $type);

	$res = array();
	foreach ($arr as $item)
	$res[] = $this->quote($item, $type);

	return implode(',', $res);
	}


	/**
	* Return SQL statement to convert a field value into a unix timestamp
	*
	* @param string Field name
	* @return string SQL statement to use in query
	* @access public
	*/
	function unixtimestamp($field)
	{
	switch($this->db_provider)
	{
	case 'pgsql':
	return "EXTRACT (EPOCH FROM $field)";
	break;

	case 'mssql':
	case 'sqlsrv':
	return "DATEDIFF(second, '19700101', $field) + DATEDIFF(second, GETDATE(), GETUTCDATE())";

	default:
	return "UNIX_TIMESTAMP($field)";
	}
	}


	/**
	* Return SQL statement to convert from a unix timestamp
	*
	* @param string Field name
	* @return string SQL statement to use in query
	* @access public
	*/
	function fromunixtime($timestamp)
	{
	switch($this->db_provider)
	{
	case 'mysqli':
	case 'mysql':
	case 'sqlite':
	return sprintf("FROM_UNIXTIME(%d)", $timestamp);

	default:
	return date("'Y-m-d H:i:s'", $timestamp);
	}
	}


	/**
	* Return SQL statement for case insensitive LIKE
	*
	* @param string Field name
	* @param string Search value
	* @return string SQL statement to use in query
	* @access public
	*/
	function ilike($column, $value)
	{
	// TODO: use MDB2's matchPattern() function
	switch($this->db_provider)
	{
	case 'pgsql':
	return $this->quote_identifier($column).' ILIKE '.$this->quote($value);
	default:
	return $this->quote_identifier($column).' LIKE '.$this->quote($value);
	}
	}


	/**
	* Encodes non-UTF-8 characters in string/array/object (recursive)
	*
	* @param mixed Data to fix
	* @return mixed Properly UTF-8 encoded data
	* @access public
	*/
	function encode($input)
	{
	if (is_object($input)) {
	foreach (get_object_vars($input) as $idx => $value)
	$input->$idx = $this->encode($value);
	return $input;
	}
	else if (is_array($input)) {
	foreach ($input as $idx => $value)
	$input[$idx] = $this->encode($value);
	return $input;
	}

	return utf8_encode($input);
	}


	/**
	* Decodes encoded UTF-8 string/object/array (recursive)
	*
	* @param mixed Input data
	* @return mixed Decoded data
	* @access public
	*/
	function decode($input)
	{
	if (is_object($input)) {
	foreach (get_object_vars($input) as $idx => $value)
	$input->$idx = $this->decode($value);
	return $input;
	}
	else if (is_array($input)) {
	foreach ($input as $idx => $value)
	$input[$idx] = $this->decode($value);
	return $input;
	}

	return utf8_decode($input);
	}


	/**
	* Adds a query result and returns a handle ID
	*
	* @param object Query handle
	* @return mixed Handle ID
	* @access private
	*/
	function _add_result($res)
	{
	// sql error occured
	if (PEAR::isError($res))
	{
	$this->db_error = TRUE;
	$this->db_error_msg = $res->getMessage();
	raise_error(array('code' => 500, 'type' => 'db',
	'line' => __LINE__, 'file' => __FILE__,
	'message' => $res->getMessage() . " Query: "
	. substr(preg_replace('/[\r\n]+\s*/', ' ', $res->userinfo), 0, 512)),
	TRUE, FALSE);
	}

	$res_id = sizeof($this->a_query_results);
	$this->last_res_id = $res_id;
	$this->a_query_results[$res_id] = $res;
	return $res_id;
	}


	/**
	* Resolves a given handle ID and returns the according query handle
	* If no ID is specified, the last resource handle will be returned
	*
	* @param number Handle ID
	* @return mixed Resource handle or FALSE on failure
	* @access private
	*/
	function _get_result($res_id=NULL)
	{
	if ($res_id==NULL)
	$res_id = $this->last_res_id;

	if (isset($this->a_query_results[$res_id]))
	if (!PEAR::isError($this->a_query_results[$res_id]))
	return $this->a_query_results[$res_id];

	return FALSE;
	}


	/**
	* Create a sqlite database from a file
	*
	* @param object SQLite database handle
	* @param string File path to use for DB creation
	* @access private
	*/
	function _sqlite_create_database($dbh, $file_name)
	{
	if (empty($file_name) \|\| !is_string($file_name))
	return;

	$data = file_get_contents($file_name);

	if (strlen($data))
	if (!sqlite_exec($dbh->connection, $data, $error) \|\| MDB2::isError($dbh))
	raise_error(array('code' => 500, 'type' => 'db',
	'line' => __LINE__, 'file' => __FILE__, 'message' => $error), TRUE, FALSE);
	}


	/**
	* Add some proprietary database functions to the current SQLite handle
	* in order to make it MySQL compatible
	*
	* @access private
	*/
	function _sqlite_prepare()
	{
	include_once('include/rcube_sqlite.inc');

	// we emulate via callback some missing MySQL function
	sqlite_create_function($this->db_handle->connection, "from_unixtime", "rcube_sqlite_from_unixtime");
	sqlite_create_function($this->db_handle->connection, "unix_timestamp", "rcube_sqlite_unix_timestamp");
	sqlite_create_function($this->db_handle->connection, "now", "rcube_sqlite_now");
	sqlite_create_function($this->db_handle->connection, "md5", "rcube_sqlite_md5");
	}


	} // end class rcube_db


	/* this is our own debug handler for the MDB2 connection */
	function mdb2_debug_handler(&$db, $scope, $message, $context = array())
	{
	if ($scope != 'prepare')
	{
	$debug_output = $scope . '('.$db->db_index.'): ' . $message;
	write_log('sql', $debug_output);
	}
	}

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