/**

*

* @package dbal

* @version $Id: firebird.php 8967 2008-10-02 12:04:12Z acydburn $

* @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);

/**

* Firebird/Interbase Database Abstraction Layer

* Minimum Requirement is Firebird 2.0

* @package dbal

*/

class dbal_firebird extends dbal

{

	var $last_query_text = '';

	var $service_handle = false;

	var $affected_rows = 0;

	/**

	* 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 = str_replace('\\', '/', $database);

		// There are three possibilities to connect to an interbase db

		if (!$this->server)

		{

			$use_database = $this->dbname;

		}

		else if (strpos($this->server, '//') === 0)

		{

			$use_database = $this->server . $this->dbname;

		}

		else

		{

			$use_database = $this->server . ':' . $this->dbname;

		}

		$this->db_connect_id = ($this->persistency) ? @ibase_pconnect($use_database, $this->user, $sqlpassword, false, false, 3) : @ibase_connect($use_database, $this->user, $sqlpassword, false, false, 3);

		$this->service_handle = (function_exists('ibase_service_attach') && $this->server) ? @ibase_service_attach($this->server, $this->user, $sqlpassword) : false;

		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

	* @return string sql server version

	*/

	function sql_server_info($raw = false)

	{

		if ($this->service_handle !== false && function_exists('ibase_server_info'))

		{

			return @ibase_server_info($this->service_handle, IBASE_SVC_SERVER_VERSION);

		}

		return ($raw) ? '2.0' : 'Firebird/Interbase';

	}

	/**

	* SQL Transaction

	* @access private

	*/

	function _sql_transaction($status = 'begin')

	{

		switch ($status)

		{

			case 'begin':

				return true;

			break;

			case 'commit':

				return @ibase_commit();

			break;

			case 'rollback':

				return @ibase_rollback();

			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)

			{

				$array = array();

				// We overcome Firebird's 32767 char limit by binding vars

				if (strlen($query) > 32767)

				{

					if (preg_match('/^(INSERT INTO[^(]++)\\(([^()]+)\\) VALUES[^(]++\\((.*?)\\)$/s', $query, $regs))

					{

						if (strlen($regs[3]) > 32767)

						{

							preg_match_all('/\'(?:[^\']++|\'\')*+\'|[\d-.]+/', $regs[3], $vals, PREG_PATTERN_ORDER);

							$inserts = $vals[0];

							unset($vals);

							foreach ($inserts as $key => $value)

							{

								if (!empty($value) && $value[0] === "'" && strlen($value) > 32769) // check to see if this thing is greater than the max + 'x2

								{

									$inserts[$key] = '?';

									$array[] = str_replace("''", "'", substr($value, 1, -1));

								}

							}

							$query = $regs[1] . '(' . $regs[2] . ') VALUES (' . implode(', ', $inserts) . ')';

						}

					}

					else if (preg_match('/^(UPDATE ([\\w_]++)\\s+SET )([\\w_]++\\s*=\\s*(?:\'(?:[^\']++|\'\')*+\'|\\d+)(?:,\\s*[\\w_]++\\s*=\\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+))*+)\\s+(WHERE.*)$/s', $query, $data))

					{

						if (strlen($data[3]) > 32767)

						{

							$update = $data[1];

							$where = $data[4];

							preg_match_all('/(\\w++)\\s*=\\s*(\'(?:[^\']++|\'\')*+\'|[\d-.]++)/', $data[3], $temp, PREG_SET_ORDER);

							unset($data);

							$cols = array();

							foreach ($temp as $value)

							{

								if (!empty($value[2]) && $value[2][0] === "'" && strlen($value[2]) > 32769) // check to see if this thing is greater than the max + 'x2

								{

									$array[] = str_replace("''", "'", substr($value[2], 1, -1));

									$cols[] = $value[1] . '=?';

								}

								else

								{

									$cols[] = $value[1] . '=' . $value[2];

								}

							}

							$query = $update . implode(', ', $cols) . ' ' . $where;

							unset($cols);

						}

					}

				}

				if (!function_exists('ibase_affected_rows') && (preg_match('/^UPDATE ([\w_]++)\s+SET [\w_]++\s*=\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+)(?:,\s*[\w_]++\s*=\s*(?:\'(?:[^\']++|\'\')*+\'|[\d-.]+))*+\s+(WHERE.*)?$/s', $query, $regs) || preg_match('/^DELETE FROM ([\w_]++)\s*(WHERE\s*.*)?$/s', $query, $regs)))

				{

					$affected_sql = 'SELECT COUNT(*) as num_rows_affected FROM ' . $regs[1];

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

					{

						$affected_sql .= ' ' . $regs[2];

					}

					if (!($temp_q_id = @ibase_query($this->db_connect_id, $affected_sql)))

					{

						return false;

					}

					$temp_result = @ibase_fetch_assoc($temp_q_id);

					@ibase_free_result($temp_q_id);

					$this->affected_rows = ($temp_result) ? $temp_result['NUM_ROWS_AFFECTED'] : false;

				}

				if (sizeof($array))

				{

					$p_query = @ibase_prepare($this->db_connect_id, $query);

					array_unshift($array, $p_query);

					$this->query_result = call_user_func_array('ibase_execute', $array);

					unset($array);

					if ($this->query_result === false)

					{

						$this->sql_error($query);

					}

				}

				else if (($this->query_result = @ibase_query($this->db_connect_id, $query)) === false)

				{

					$this->sql_error($query);

				}

				if (defined('DEBUG_EXTRA'))

				{

					$this->sql_report('stop', $query);

				}

				if (!$this->transaction)

				{

					if (function_exists('ibase_commit_ret'))

					{

						@ibase_commit_ret();

					}

					else

					{

						// way cooler than ibase_commit_ret :D

						@ibase_query('COMMIT RETAIN;');

					}

				}

				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;

		$query = 'SELECT FIRST ' . $total . ((!empty($offset)) ? ' SKIP ' . $offset : '') . substr($query, 6);

		return $this->sql_query($query, $cache_ttl);

	}

	/**

	* Return number of affected rows

	*/

	function sql_affectedrows()

	{

		// PHP 5+ function

		if (function_exists('ibase_affected_rows'))

		{

			return ($this->db_connect_id) ? @ibase_affected_rows($this->db_connect_id) : false;

		}

		else

		{

			return $this->affected_rows;

		}

	}

	/**

	* 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 = array();

		$cur_row = @ibase_fetch_object($query_id, IBASE_TEXT);

		if (!$cur_row)

		{

			return false;

		}

		foreach (get_object_vars($cur_row) as $key => $value)

		{

			$row[strtolower($key)] = (is_string($value)) ? trim(str_replace(array("\\0", "\\n"), array("\0", "\n"), $value)) : $value;

		}

		return (sizeof($row)) ? $row : 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;

		}

		$this->sql_freeresult($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()

	{

		$query_id = $this->query_result;

		if ($query_id !== false && $this->last_query_text != '')

		{

			if ($this->query_result && preg_match('#^INSERT[\t\n ]+INTO[\t\n ]+([a-z0-9\_\-]+)#i', $this->last_query_text, $tablename))

			{

				$sql = 'SELECT GEN_ID(' . $tablename[1] . '_gen, 0) AS new_id FROM RDB$DATABASE';

				if (!($temp_q_id = @ibase_query($this->db_connect_id, $sql)))

				{

					return false;

				}

				$temp_result = @ibase_fetch_assoc($temp_q_id);

				@ibase_free_result($temp_q_id);

				return ($temp_result) ? $temp_result['NEW_ID'] : false;

			}

		}

		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 @ibase_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'	=> @ibase_errmsg(),

			'code'		=> (@function_exists('ibase_errcode') ? @ibase_errcode() : '')

		);

	}

	/**

	* Close sql connection

	* @access private

	*/

	function _sql_close()

	{

		if ($this->service_handle !== false)

		{

			@ibase_service_detach($this->service_handle);

		}

		return @ibase_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];

				$result = @ibase_query($this->db_connect_id, $query);

				while ($void = @ibase_fetch_object($result, IBASE_TEXT))

				{

					// Take the time spent on parsing rows into account

				}

				@ibase_free_result($result);

				$splittime = explode(' ', microtime());

				$splittime = $splittime[0] + $splittime[1];

				$this->sql_report('record_fromcache', $query, $endtime, $splittime);

			break;

		}

	}

}

?>