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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.' . $phpEx);
/**
* MSSQL Database Abstraction Layer
* Minimum Requirement is MSSQL 2000+
* @package dbal
*/
class dbal_mssql extends dbal
{
/**
* Connect to server
*/
function sql_connect($sqlserver, $sqluser, $sqlpassword, $database, $port = false, $persistency = false, $new_link = false)
{
$this->persistency = $persistency;
$this->user = $sqluser;
$this->server = $sqlserver . (($port) ? ':' . $port : '');
$this->dbname = $database;
@ini_set('mssql.charset', 'UTF-8');
@ini_set('mssql.textlimit', 2147483647);
@ini_set('mssql.textsize', 2147483647);
$this->db_connect_id = ($this->persistency) ? @mssql_pconnect($this->server, $this->user, $sqlpassword, $new_link) : @mssql_connect($this->server, $this->user, $sqlpassword, $new_link);
if ($this->db_connect_id && $this->dbname != '')
{
if (!@mssql_select_db($this->dbname, $this->db_connect_id))
{
@mssql_close($this->db_connect_id);
return false;
}
}
return ($this->db_connect_id) ? $this->db_connect_id : $this->sql_error('');
}
/**
* Version information about used database
*/
function sql_server_info()
{
$result_id = @mssql_query("SELECT SERVERPROPERTY('productversion'), SERVERPROPERTY('productlevel'), SERVERPROPERTY('edition')", $this->db_connect_id);
$row = false;
if ($result_id)
{
$row = @mssql_fetch_assoc($result_id);
@mssql_free_result($result_id);
}
if ($row)
{
return 'MSSQL<br />' . implode(' ', $row);
}
return 'MSSQL';
}
/**
* SQL Transaction
* @access private
*/
function _sql_transaction($status = 'begin')
{
switch ($status)
{
case 'begin':
return @mssql_query('BEGIN TRANSACTION', $this->db_connect_id);
break;
case 'commit':
return @mssql_query('COMMIT TRANSACTION', $this->db_connect_id);
break;
case 'rollback':
return @mssql_query('ROLLBACK TRANSACTION', $this->db_connect_id);
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);
}
$this->query_result = ($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 = @mssql_query($query, $this->db_connect_id)) === 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) ? $this->query_result : false;
}
/**
* Build LIMIT query
*/
function _sql_query_limit($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) ? @mssql_rows_affected($this->db_connect_id) : false;
}
/**
* Fetch current row
*/
function sql_fetchrow($query_id = 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);
}
if ($query_id === false)
{
return false;
}
$row = @mssql_fetch_assoc($query_id);
// I hope i am able to remove this later... hopefully only a PHP or MSSQL bug
if ($row)
{
foreach ($row as $key => $value)
{
$row[$key] = ($value === ' ' || $value === NULL) ? '' : $value;
}
}
return $row;
}
/**
* Seek to given row number
* rownum is zero-based
*/
function sql_rowseek($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, $query_id);
}
return ($query_id !== false) ? @mssql_data_seek($query_id, $rownum) : false;
}
/**
* Get last inserted id after insert statement
*/
function sql_nextid()
{
$result_id = @mssql_query('SELECT SCOPE_IDENTITY()', $this->db_connect_id);
if ($result_id)
{
if ($row = @mssql_fetch_assoc($result_id))
{
@mssql_free_result($result_id);
return $row['computed'];
}
@mssql_free_result($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($this->open_queries[$query_id]))
{
unset($this->open_queries[$query_id]);
return @mssql_free_result($query_id);
}
return false;
}
/**
* Escape string used in sql query
*/
function sql_escape($msg)
{
return str_replace("'", "''", $msg);
}
/**
* Expose a DBMS specific function
*/
function sql_function($type, $col)
{
switch ($type)
{
case 'length_varchar':
case 'length_text':
return 'DATALENGTH(' . $col . ')';
break;
}
}
/**
* Build LIKE expression
* @access private
*/
function _sql_like_expression($expression)
{
return $expression . " ESCAPE '\\'";
}
/**
* return sql error array
* @access private
*/
function _sql_error()
{
$error = array(
'message' => @mssql_get_last_message(),
'code' => ''
);
// Get error code number
$result_id = @mssql_query('SELECT @@ERROR as code', $this->db_connect_id);
if ($result_id)
{
$row = @mssql_fetch_assoc($result_id);
$error['code'] = $row['code'];
@mssql_free_result($result_id);
}
// Get full error message if possible
$sql = 'SELECT CAST(description as varchar(255)) as message
FROM master.dbo.sysmessages
WHERE error = ' . $error['code'];
$result_id = @mssql_query($sql);
if ($result_id)
{
$row = @mssql_fetch_assoc($result_id);
if (!empty($row['message']))
{
$error['message'] .= '<br />' . $row['message'];
}
@mssql_free_result($result_id);
}
return $error;
}
/**
* Build db-specific query data
* @access private
*/
function _sql_custom_build($stage, $data)
{
return $data;
}
/**
* Close sql connection
* @access private
*/
function _sql_close()
{
return @mssql_close($this->db_connect_id);
}
/**
* Build db-specific report
* @access private
*/
function _sql_report($mode, $query = '')
{
switch ($mode)
{
case 'start':
$html_table = false;
@mssql_query('SET SHOWPLAN_TEXT ON;', $this->db_connect_id);
if ($result = @mssql_query($query, $this->db_connect_id))
{
@mssql_next_result($result);
while ($row = @mssql_fetch_row($result))
{
$html_table = $this->sql_report('add_select_row', $query, $html_table, $row);
}
}
@mssql_query('SET SHOWPLAN_TEXT OFF;', $this->db_connect_id);
@mssql_free_result($result);
if ($html_table)
{
$this->html_hold .= '</table>';
}
break;
case 'fromcache':
$endtime = explode(' ', microtime());
$endtime = $endtime[0] + $endtime[1];
$result = @mssql_query($query, $this->db_connect_id);
while ($void = @mssql_fetch_assoc($result))
{
// Take the time spent on parsing rows into account
}
@mssql_free_result($result);
$splittime = explode(' ', microtime());
$splittime = $splittime[0] + $splittime[1];
$this->sql_report('record_fromcache', $query, $endtime, $splittime);
break;
}
}
}
?>
|
