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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: rcube_mdb2.php 2834 2009-08-04 08:22:41Z alec $
*/
/**
* 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 $last_res_id = 0;
/**
* Object constructor
*
* @param string DSN for read/write operations
* @param string Optional DSN for read only operations
*/
function __construct($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')
$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 = $this->db_handle->query($query);
else
{
$params = (array)$params;
$q = $this->db_handle->prepare($query);
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 || $this->db_mode=='r')
return FALSE;
// find sequence name
if ($table && $this->db_provider == 'pgsql')
$table = get_sequence_name($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);
}
/**
* 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($this->db_provider)
{
case 'mssql':
return "getdate()";
default:
return "now()";
}
}
/**
* Return list of elements for use with SQL's IN clause
*
* @param string Input array
* @return string Elements list string
* @access public
*/
function array2list($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':
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.'): ';
$debug_output .= $message . $db->getOption('log_line_break');
write_log('sql', $debug_output);
}
}
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