/modules/PNphpBB2/db/mssql.php

<?php

/***************************************************************************

 *                                 mssql.php

 *                            -------------------

 *   begin                : Saturday, Feb 13, 2001

 *   copyright            : (C) 2001 The phpBB Group

 *   email                : supportphpbb.com

 *

 *   $Id: mssql.php,v 1.22.2.4 2006/03/09 19:57:37 grahamje Exp $

 *

 ***************************************************************************/



/***************************************************************************

 *

 *   This program is free software; you can redistribute it and/or modify

 *   it under the terms of the GNU General Public License as published by

 *   the Free Software Foundation; either version 2 of the License, or

 *   (at your option) any later version.

 *

 ***************************************************************************/



if(!defined("SQL_LAYER"))

{



define("SQL_LAYER","mssql");



class sql_db

{



	var $db_connect_id;

	var $result;



	var $next_id;

	var $in_transaction = 0;



	var $row = array();

	var $rowset = array();

	var $limit_offset;

	var $query_limit_success;



	var $num_queries = 0;



	//

	// Constructor

	//

	function sql_db($sqlserver, $sqluser, $sqlpassword, $database, $persistency = true)

	{

		$this->persistency = $persistency;

		$this->user = $sqluser;

		$this->password = $sqlpassword;

		$this->server = $sqlserver;

		$this->dbname = $database;



		$this->db_connect_id = ( $this->persistency ) ? @mssql_pconnect($this->server, $this->user, $this->password) : @mssql_connect($this->server, $this->user, $this->password);



		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;

	}



	//

	// Other base methods

	//

	function sql_close()

	{

		if($this->db_connect_id)

		{

			//

			// Commit any remaining transactions

			//

			if( $this->in_transaction )

			{

				@mssql_query("COMMIT", $this->db_connect_id);

			}



			return @mssql_close($this->db_connect_id);

		}

		else

		{

			return false;

		}

	}





	//

	// Query method

	//

	function sql_query($query = '', $transaction = FALSE)

	{

		//

		// Remove any pre-existing queries

		//

		unset($this->result);

		unset($this->row);



		if ( $query != '' )

		{

			$this->num_queries++;



			if ( $transaction == BEGIN_TRANSACTION && !$this->in_transaction )

			{

				if ( !@mssql_query('BEGIN TRANSACTION', $this->db_connect_id) )

				{

					return false;

				}

				$this->in_transaction = TRUE;

			}



			//

			// Does query contain any LIMIT code? If so pull out relevant start and num_results

			// This isn't terribly easy with MSSQL, whatever you do will potentially impact

			// performance compared to an 'in-built' limit

			//

			// Another issue is the 'lack' of a returned true value when a query is valid but has

			// no result set (as with all the other DB interfaces). It seems though that it's

			// 'fair' to say that if a query returns a false result (ie. no resource id) then the

			// SQL was valid but had no result set. If the query returns nothing but the rowcount

			// returns something then there's a problem. This may well be a false assumption though

			// ... needs checking under Windows itself.

			//

			if( preg_match('#^SELECT(.*?)(LIMIT ([0-9]+)[, ]*([0-9]+)*)?$#s', $query, $limits) )

			{

				$query = $limits[1];



				if( !empty($limits[2]) )

				{

					$row_offset = ( $limits[4] ) ? $limits[3] : "";

					$num_rows = ( $limits[4] ) ? $limits[4] : $limits[3];



					$query = 'TOP ' . ( $row_offset + $num_rows ) . $query;

				}



				$this->result = @mssql_query("SELECT $query", $this->db_connect_id); 



				if( $this->result )

				{

					$this->limit_offset[$this->result] = ( !empty($row_offset) ) ? $row_offset : 0;



					if( $row_offset > 0 )

					{

						@mssql_data_seek($this->result, $row_offset);

					}

				}

			}

			else if( preg_match('#^INSERT #i', $query) )

			{

				if( @mssql_query($query, $this->db_connect_id) )

				{

					$this->result = time() + microtime();



					$result_id = @mssql_query('SELECT @@IDENTITY AS id, @@ROWCOUNT as affected', $this->db_connect_id);

					if( $result_id )

					{

						if( $row = @mssql_fetch_array($result_id) )

						{

							$this->next_id[$this->db_connect_id] = $row['id'];	

							$this->affected_rows[$this->db_connect_id] = $row['affected'];

						}

					}

				}

			}

			else

			{

				if( @mssql_query($query, $this->db_connect_id) )

				{

					$this->result = time() + microtime();



					$result_id = @mssql_query('SELECT @@ROWCOUNT as affected', $this->db_connect_id);

					if( $result_id )

					{

						if( $row = @mssql_fetch_array($result_id) )

						{

							$this->affected_rows[$this->db_connect_id] = $row['affected'];

						}

					}

				}

			}



			if( !$this->result )

			{

				if( $this->in_transaction )

				{

					@mssql_query('ROLLBACK', $this->db_connect_id);

					$this->in_transaction = FALSE;

				}



				return false;

			}



			if( $transaction == END_TRANSACTION && $this->in_transaction )

			{

				$this->in_transaction = FALSE;



				if( !@mssql_query('COMMIT', $this->db_connect_id) )

				{

					@mssql_query("ROLLBACK", $this->db_connect_id);

					return false;

				}

			}



			return $this->result;

		}

		else

		{

			if( $transaction == END_TRANSACTION && $this->in_transaction  )

			{

				$this->in_transaction = FALSE;



				if( !@mssql_query('COMMIT', $this->db_connect_id) )

				{

					@mssql_query('ROLLBACK', $this->db_connect_id);

					return false;

				}

			}



			return true;

		}

	}



	//

	// Other query methods

	//

	function sql_numrows($query_id = 0)

	{

		if( !$query_id )

		{

			$query_id = $this->result;

		}



		if( $query_id )

		{

			return ( !empty($this->limit_offset[$query_id]) ) ? @mssql_num_rows($query_id) - $this->limit_offset[$query_id] : @mssql_num_rows($query_id);

		}

		else

		{

			return false;

		}

	}



	function sql_numfields($query_id = 0)

	{

		if( !$query_id )

		{

			$query_id = $this->result;

		}



		return ( $query_id ) ? @mssql_num_fields($query_id) : false;

	}



	function sql_fieldname($offset, $query_id = 0)

	{

		if( !$query_id )

		{

			$query_id = $this->result;

		}



		return ( $query_id ) ? @mssql_field_name($query_id, $offset) : false;

	}



	function sql_fieldtype($offset, $query_id = 0)

	{

		if(!$query_id)

		{

			$query_id = $this->result;

		}



		return ( $query_id ) ? @mssql_field_type($query_id, $offset) : false;

	}



	function sql_fetchrow($query_id = 0)

	{

		if( !$query_id )

		{

			$query_id = $this->result;

		}



		if( $query_id )

		{

			empty($row);



			$row = @mssql_fetch_array($query_id);



			while( list($key, $value) = @each($row) )

			{

				$row[$key] = ($value === ' ') ? '' : stripslashes($value);

			}

			@reset($row);



			return $row;

		}

		else

		{

			return false;

		}

	}



	function sql_fetchrowset($query_id = 0)

	{

		if( !$query_id )

		{

			$query_id = $this->result;

		}



		if( $query_id )

		{

			$i = 0;

			empty($rowset);



			while( $row = @mssql_fetch_array($query_id))

			{

				while( list($key, $value) = @each($row) )

				{

					$rowset[$i][$key] = ($value === ' ') ? '' : stripslashes($value);

				}

				$i++;

			}

			@reset($rowset);



			return $rowset;

		}

		else

		{

			return false;

		}

	}



	function sql_fetchfield($field, $row = -1, $query_id)

	{

		if( !$query_id )

		{

			$query_id = $this->result;

		}



		if( $query_id )

		{

			if( $row != -1 )

			{

				if( $this->limit_offset[$query_id] > 0 )

				{

					$result = ( !empty($this->limit_offset[$query_id]) ) ? @mssql_result($this->result, ($this->limit_offset[$query_id] + $row), $field) : false;

				}

				else

				{

					$result = @mssql_result($this->result, $row, $field);

				}

			}

			else

			{

				if( empty($this->row[$query_id]) )

				{

					$this->row[$query_id] = @mssql_fetch_array($query_id);

					$result = ($this->row[$query_id][$field] === ' ') ? '' : stripslashes($this->row[$query_id][$field]);

				}

			}



			return $result;

		}

		else

		{

			return false;

		}

	}



	function sql_rowseek($rownum, $query_id = 0)

	{

		if( !$query_id )

		{

			$query_id = $this->result;

		}



		if( $query_id )

		{

			return ( !empty($this->limit_offset[$query_id]) ) ? @mssql_data_seek($query_id, ($this->limit_offset[$query_id] + $rownum)) : @mssql_data_seek($query_id, $rownum);

		}

		else

		{

			return false;

		}

	}



	function sql_nextid()

	{

		return ( $this->next_id[$this->db_connect_id] ) ? $this->next_id[$this->db_connect_id] : false;

	}



	function sql_affectedrows()

	{

		return ( $this->affected_rows[$this->db_connect_id] ) ? $this->affected_rows[$this->db_connect_id] : false;

	}



	function sql_freeresult($query_id = 0)

	{

		if( !$query_id )

		{

			$query_id = $this->result;

		}



		return ( $query_id ) ? @mssql_free_result($query_id) : false;

	}



	function sql_error($query_id = 0)

	{

		$result['message'] = @mssql_get_last_message();

		return $result;

	}



} // class sql_db



} // if ... define



?>