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rcube_mdb2.inc
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rcube_mdb2.inc
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<?php
/*
+-----------------------------------------------------------------------+
| program/include/rcube_mdb2.inc |
| |
| This file is part of the RoundCube Webmail client |
| Copyright (C) 2005-2007, 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> |
+-----------------------------------------------------------------------+
$Id$
*/
/**
* Obtain the PEAR::DB class that is used for abstraction
*/
require_once('MDB2.php');
/**
* 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 $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 = $dsn_array['phptype'];
}
/**
* PHP 4 object constructor
*
* @see rcube_mdb2::__construct
*/
function rcube_db($db_dsnw,$db_dsnr='')
{
$this->__construct($db_dsnw,$db_dsnr);
}
/**
* Connect to specific database
*
* @param string DSN for DB connections
* @return object PEAR database handle
* @access private
*/
function dsn_connect($dsn)
{
// Use persistent connections if available
$dbh = MDB2::connect($dsn, array('persistent' => $this->db_pconn, 'portability' => MDB2_PORTABILITY_ALL ^ MDB2_PORTABILITY_EMPTY_TO_NULL));
if (PEAR::isError($dbh))
{
$this->db_error = TRUE;
$this->db_error_msg = $dbh->getMessage();
raise_error(array('code' => 500, 'type' => 'db', 'line' => __LINE__, 'file' => __FILE__,
'message' => $dbh->getMessage()), TRUE, FALSE);
}
else if ($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
$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;
}
/**
* Getter for error state
*
* @param boolean True on error
*/
function is_error()
{
return $this->db_error ? $this->db_error_msg : FALSE;
}
/**
* 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()
{
$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, $params)
{
// Read or write ?
if (strtolower(trim(substr($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 $result->numRows();
else
return FALSE;
}
/**
* Get number of affected rows fort he last query
*
* @return mixed Number of rows or FALSE on failure
* @access public
*/
function affected_rows($result = null)
{
if (!$this->db_handle)
return FALSE;
return $this->_get_result($result);
}
/**
* Get last inserted record ID
* For Postgres databases, a sequence name is required
*
* @param string Sequence name for increment
* @return mixed ID or FALSE on failure
* @access public
*/
function insert_id($sequence = '')
{
if (!$this->db_handle || $this->db_mode=='r')
return FALSE;
return $this->db_handle->lastInsertID($sequence);
}
/**
* 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 co 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, $mode)
{
if (PEAR::isError($result))
{
raise_error(array('code' => 500, 'type' => 'db', 'line' => __LINE__, 'file' => __FILE__,
'message' => $this->db_link->getMessage()), TRUE, FALSE);
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);
}
/**
* Return SQL function for current time and date
*
* @return string SQL function to use in query
* @access public
*/
function now()
{
switch($this->db_provider)
{
case 'mssql':
return "getdate()";
default:
return "now()";
}
}
/**
* Return SQL statement to convert a field value into a unix timestamp
*
* @param string Field name
* @return string SQL statement to use in query
* @access public
*/
function unixtimestamp($field)
{
switch($this->db_provider)
{
case 'pgsql':
return "EXTRACT (EPOCH FROM $field)";
break;
case 'mssql':
return "datediff(s, '1970-01-01 00:00:00', $field)";
default:
return "UNIX_TIMESTAMP($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 "FROM_UNIXTIME($timestamp)";
default:
return date("'Y-m-d H:i:s'", $timestamp);
}
}
/**
* Adds a query result and returns a handle ID
*
* @param object Query handle
* @return mixed Handle ID or FALE on failure
* @access private
*/
function _add_result($res)
{
// sql error occured
if (PEAR::isError($res))
{
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);
return FALSE;
}
else
{
$res_id = sizeof($this->a_query_results);
$this->a_query_results[$res_id] = $res;
$this->last_res_id = $res_id;
return $res_id;
}
}
/**
* Resolves a given handle ID and returns the according query handle
* If no ID is specified, the last ressource handle will be returned
*
* @param number Handle ID
* @return mixed Ressource handle or FALE on failure
* @access private
*/
function _get_result($res_id=NULL)
{
if ($res_id==NULL)
$res_id = $this->last_res_id;
if ($res_id && isset($this->a_query_results[$res_id]))
return $this->a_query_results[$res_id];
else
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;
$data = '';
if ($fd = fopen($file_name, 'r'))
{
$data = fread($fd, filesize($file_name));
fclose($fd);
}
if (strlen($data))
sqlite_exec($dbh->connection, $data);
}
/**
* Add some proprietary database functions to the current SQLite handle
* in order to make it MySQL compatible
*
* @access private
*/
function _sqlite_prepare()
{
include_once('include/rcube_sqlite.inc');
// we emulate via callback some missing MySQL function
sqlite_create_function($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
?>

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