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<?php
/**
*
* @package dbal
* @version $Id$
* @copyright (c) 2005 phpBB Group
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
*
*/
/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
exit;
}
include_once($phpbb_root_path . 'includes/db/dbal.' . $phpEx);
/**
* Unified ODBC functions
* Unified ODBC functions support any database having ODBC driver, for example Adabas D, IBM DB2, iODBC, Solid, Sybase SQL Anywhere...
* Here we only support MSSQL Server 2000+ because of the provided schema
*
* @note number of bytes returned for returning data depends on odbc.defaultlrl php.ini setting.
* If it is limited to 4K for example only 4K of data is returned max, resulting in incomplete theme data for example.
* @note odbc.defaultbinmode may affect UTF8 characters
*
* @package dbal
*/
class dbal_mssql_odbc extends dbal
{
var $last_query_text = '';
/**
* Connect to server
*/
function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
{
$this->persistency = $persistency;
$this->user = $sqluser;
$this->dbname = $database;
$port_delimiter = (defined('PHP_OS') && substr(PHP_OS, 0, 3) === 'WIN') ? ',' : ':';
$this->server = $sqlserver . (($port) ? $port_delimiter . $port : '');
$max_size = @ini_get('odbc.defaultlrl');
if (!empty($max_size))
{
$unit = strtolower(substr($max_size, -1, 1));
$max_size = (int) $max_size;
if ($unit == 'k')
{
$max_size = floor($max_size / 1024);
}
else if ($unit == 'g')
{
$max_size *= 1024;
}
else if (is_numeric($unit))
{
$max_size = floor((int) ($max_size . $unit) / 1048576);
}
$max_size = max(8, $max_size) . 'M';
@ini_set('odbc.defaultlrl', $max_size);
}
$this->db_connect_id = ($this->persistency) ? @odbc_pconnect($this->server, $this->user, $sqlpassword) : @odbc_connect($this->server, $this->user, $sqlpassword);
return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error('');
}
/**
* Version information about used database
* @param bool $raw if true, only return the fetched sql_server_version
* @param bool $use_cache If true, it is safe to retrieve the value from the cache
* @return string sql server version
*/
function sql_server_info($raw = false, $use_cache = true)
{
global $cache;
if (!$use_cache || empty($cache) || ($this->sql_server_version = $cache->get('mssqlodbc_version')) === false)
{
$result_id = @odbc_exec($this->db_connect_id, "SELECT SERVERPROPERTY('productversion'), SERVERPROPERTY('productlevel'), SERVERPROPERTY('edition')");
$row = false;
if ($result_id)
{
$row = @odbc_fetch_array($result_id);
@odbc_free_result($result_id);
}
$this->sql_server_version = ($row) ? trim(implode(' ', $row)) : 0;
if (!empty($cache) && $use_cache)
{
$cache->put('mssqlodbc_version', $this->sql_server_version);
}
}
if ($raw)
{
return $this->sql_server_version;
}
return ($this->sql_server_version) ? 'MSSQL (ODBC)<br />' . $this->sql_server_version : 'MSSQL (ODBC)';
}
/**
* SQL Transaction
* @access private
*/
function _sql_transaction($status = 'begin')
{
switch ($status)
{
case 'begin':
return @odbc_exec($this->db_connect_id, 'BEGIN TRANSACTION');
break;
case 'commit':
return @odbc_exec($this->db_connect_id, 'COMMIT TRANSACTION');
break;
case 'rollback':
return @odbc_exec($this->db_connect_id, 'ROLLBACK TRANSACTION');
break;
}
return true;
}
/**
* Base query method
*
* @param string $query Contains the SQL query which shall be executed
* @param int $cache_ttl Either 0 to avoid caching or the time in seconds which the result shall be kept in cache
* @return mixed When casted to bool the returned value returns true on success and false on failure
*
* @access public
*/
function sql_query($query = '', $cache_ttl = 0)
{
if ($query != '')
{
global $cache;
// EXPLAIN only in extra debug mode
if (defined('DEBUG_EXTRA'))
{
$this->sql_report('start', $query);
}
$this->last_query_text = $query;
$this->query_result = ($cache_ttl && method_exists($cache, 'sql_load')) ? $cache->sql_load($query) : false;
$this->sql_add_num_queries($this->query_result);
if ($this->query_result === false)
{
if (($this->query_result = @odbc_exec($this->db_connect_id, $query)) === false)
{
$this->sql_error($query);
}
if (defined('DEBUG_EXTRA'))
{
$this->sql_report('stop', $query);
}
if ($cache_ttl && method_exists($cache, 'sql_save'))
{
$this->open_queries[(int) $this->query_result] = $this->query_result;
$cache->sql_save($query, $this->query_result, $cache_ttl);
}
else if (strpos($query, 'SELECT') === 0 && $this->query_result)
{
$this->open_queries[(int) $this->query_result] = $this->query_result;
}
}
else if (defined('DEBUG_EXTRA'))
{
$this->sql_report('fromcache', $query);
}
}
else
{
return false;
}
return $this->query_result;
}
/**
* Build LIMIT query
*/
function _sql_query_limit($query, $total, $offset = 0, $cache_ttl = 0)
{
$this->query_result = false;
// Since TOP is only returning a set number of rows we won't need it if total is set to 0 (return all rows)
if ($total)
{
// We need to grab the total number of rows + the offset number of rows to get the correct result
if (strpos($query, 'SELECT DISTINCT') === 0)
{
$query = 'SELECT DISTINCT TOP ' . ($total + $offset) . ' ' . substr($query, 15);
}
else
{
$query = 'SELECT TOP ' . ($total + $offset) . ' ' . substr($query, 6);
}
}
$result = $this->sql_query($query, $cache_ttl);
// Seek by $offset rows
if ($offset)
{
$this->sql_rowseek($offset, $result);
}
return $result;
}
/**
* Return number of affected rows
*/
function sql_affectedrows()
{
return ($this->db_connect_id) ? @odbc_num_rows($this->query_result) : false;
}
/**
* Fetch current row
* @note number of bytes returned depends on odbc.defaultlrl php.ini setting. If it is limited to 4K for example only 4K of data is returned max.
*/
function sql_fetchrow($query_id = false, $debug = false)
{
global $cache;
if ($query_id === false)
{
$query_id = $this->query_result;
}
if (isset($cache->sql_rowset[$query_id]))
{
return $cache->sql_fetchrow($query_id);
}
return ($query_id !== false) ? @odbc_fetch_array($query_id) : false;
}
/**
* Seek to given row number
* rownum is zero-based
*/
function sql_rowseek($rownum, &$query_id)
{
global $cache;
if ($query_id === false)
{
$query_id = $this->query_result;
}
if (isset($cache->sql_rowset[$query_id]))
{
return $cache->sql_rowseek($rownum, $query_id);
}
if ($query_id === false)
{
return false;
}
$this->sql_freeresult($query_id);
$query_id = $this->sql_query($this->last_query_text);
if ($query_id === false)
{
return false;
}
// We do not fetch the row for rownum == 0 because then the next resultset would be the second row
for ($i = 0; $i < $rownum; $i++)
{
if (!$this->sql_fetchrow($query_id))
{
return false;
}
}
return true;
}
/**
* Get last inserted id after insert statement
*/
function sql_nextid()
{
$result_id = @odbc_exec($this->db_connect_id, 'SELECT @@IDENTITY');
if ($result_id)
{
if (@odbc_fetch_array($result_id))
{
$id = @odbc_result($result_id, 1);
@odbc_free_result($result_id);
return $id;
}
@odbc_free_result($result_id);
}
return false;
}
/**
* Free sql result
*/
function sql_freeresult($query_id = false)
{
global $cache;
if ($query_id === false)
{
$query_id = $this->query_result;
}
if (isset($cache->sql_rowset[$query_id]))
{
return $cache->sql_freeresult($query_id);
}
if (isset($this->open_queries[(int) $query_id]))
{
unset($this->open_queries[(int) $query_id]);
return @odbc_free_result($query_id);
}
return false;
}
/**
* Escape string used in sql query
*/
function sql_escape($msg)
{
return str_replace(array("'", "\0"), array("''", ''), $msg);
}
/**
* Build LIKE expression
* @access private
*/
function _sql_like_expression($expression)
{
return $expression . " ESCAPE '\\'";
}
/**
* Build db-specific query data
* @access private
*/
function _sql_custom_build($stage, $data)
{
return $data;
}
/**
* return sql error array
* @access private
*/
function _sql_error()
{
return array(
'message' => @odbc_errormsg(),
'code' => @odbc_error()
);
}
/**
* Close sql connection
* @access private
*/
function _sql_close()
{
return @odbc_close($this->db_connect_id);
}
/**
* Build db-specific report
* @access private
*/
function _sql_report($mode, $query = '')
{
switch ($mode)
{
case 'start':
break;
case 'fromcache':
$endtime = explode(' ', microtime());
$endtime = $endtime[0] + $endtime[1];
$result = @odbc_exec($this->db_connect_id, $query);
while ($void = @odbc_fetch_array($result))
{
// Take the time spent on parsing rows into account
}
@odbc_free_result($result);
$splittime = explode(' ', microtime());
$splittime = $splittime[0] + $splittime[1];
$this->sql_report('record_fromcache', $query, $endtime, $splittime);
break;
}
}
}
|
