fbsql.php
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	<?php
	// vim: set et ts=4 sw=4 fdm=marker:
	// +----------------------------------------------------------------------+
	// \| PHP versions 4 and 5 \|
	// +----------------------------------------------------------------------+
	// \| Copyright (c) 1998-2004 Manuel Lemos, Tomas V.V.Cox, \|
	// \| Stig. S. Bakken, Lukas Smith, Frank M. Kromann \|
	// \| All rights reserved. \|
	// +----------------------------------------------------------------------+
	// \| MDB2 is a merge of PEAR DB and Metabases that provides a unified DB \|
	// \| API as well as database abstraction for PHP applications. \|
	// \| This LICENSE is in the BSD license style. \|
	// \| \|
	// \| Redistribution and use in source and binary forms, with or without \|
	// \| modification, are permitted provided that the following conditions \|
	// \| are met: \|
	// \| \|
	// \| Redistributions of source code must retain the above copyright \|
	// \| notice, this list of conditions and the following disclaimer. \|
	// \| \|
	// \| Redistributions in binary form must reproduce the above copyright \|
	// \| notice, this list of conditions and the following disclaimer in the \|
	// \| documentation and/or other materials provided with the distribution. \|
	// \| \|
	// \| Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken, \|
	// \| Lukas Smith nor the names of his contributors may be used to endorse \|
	// \| or promote products derived from this software without specific prior\|
	// \| written permission. \|
	// \| \|
	// \| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \|
	// \| "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT \|
	// \| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS \|
	// \| FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE \|
	// \| REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, \|
	// \| INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, \|
	// \| BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS\|
	// \| OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED \|
	// \| AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT \|
	// \| LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY\|
	// \| WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE \|
	// \| POSSIBILITY OF SUCH DAMAGE. \|
	// +----------------------------------------------------------------------+
	// \| Author: Lukas Smith <smith@pooteeweet.org> \|
	// +----------------------------------------------------------------------+
	//
	// $Id$
	//

	/**
	* MDB2 FrontBase driver
	*
	* @package MDB2
	* @category Database
	* @author Lukas Smith <smith@pooteeweet.org>
	* @author Frank M. Kromann <frank@kromann.info>
	*/
	class MDB2_Driver_fbsql extends MDB2_Driver_Common
	{
	// {{{ properties
	var $escape_quotes = "'";

	// }}}
	// {{{ constructor

	/**
	* Constructor
	*/
	function __construct()
	{
	parent::__construct();

	$this->phptype = 'fbsql';
	$this->dbsyntax = 'fbsql';

	$this->supported['sequences'] = 'emulated';
	$this->supported['indexes'] = true;
	$this->supported['affected_rows'] = true;
	$this->supported['transactions'] = true;
	$this->supported['summary_functions'] = true;
	$this->supported['order_by_text'] = true;
	$this->supported['current_id'] = 'emulated';
	$this->supported['limit_queries'] = 'emulated';
	$this->supported['LOBs'] = true;
	$this->supported['replace'] ='emulated';
	$this->supported['sub_selects'] = true;
	$this->supported['auto_increment'] = false; // not implemented
	$this->supported['primary_key'] = false; // not implemented
	}

	// }}}
	// {{{ errorInfo()

	/**
	* This method is used to collect information about an error
	*
	* @param integer $error
	* @return array
	* @access public
	*/
	function errorInfo($error = null)
	{
	if ($this->connection) {
	$native_code = @fbsql_errno($this->connection);
	$native_msg = @fbsql_error($this->connection);
	} else {
	$native_code = @fbsql_errno();
	$native_msg = @fbsql_error();
	}
	if (is_null($error)) {
	static $ecode_map;
	if (empty($ecode_map)) {
	$ecode_map = array(
	22 => MDB2_ERROR_SYNTAX,
	85 => MDB2_ERROR_ALREADY_EXISTS,
	108 => MDB2_ERROR_SYNTAX,
	116 => MDB2_ERROR_NOSUCHTABLE,
	124 => MDB2_ERROR_VALUE_COUNT_ON_ROW,
	215 => MDB2_ERROR_NOSUCHFIELD,
	217 => MDB2_ERROR_INVALID_NUMBER,
	226 => MDB2_ERROR_NOSUCHFIELD,
	231 => MDB2_ERROR_INVALID,
	239 => MDB2_ERROR_TRUNCATED,
	251 => MDB2_ERROR_SYNTAX,
	266 => MDB2_ERROR_NOT_FOUND,
	357 => MDB2_ERROR_CONSTRAINT_NOT_NULL,
	358 => MDB2_ERROR_CONSTRAINT,
	360 => MDB2_ERROR_CONSTRAINT,
	361 => MDB2_ERROR_CONSTRAINT,
	);
	}
	if (isset($ecode_map[$native_code])) {
	$error = $ecode_map[$native_code];
	}
	}
	return array($error, $native_code, $native_msg);
	}

	// }}}
	// {{{ beginTransaction()

	/**
	* Start a transaction.
	*
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function beginTransaction()
	{
	$this->debug('starting transaction', 'beginTransaction');
	if ($this->in_transaction) {
	return MDB2_OK; //nothing to do
	}
	if (!$this->destructor_registered && $this->opened_persistent) {
	$this->destructor_registered = true;
	register_shutdown_function('MDB2_closeOpenTransactions');
	}
	$result = $this->_doQuery('SET COMMIT FALSE;', true);
	if (PEAR::isError($result)) {
	return $result;
	}
	$this->in_transaction = true;
	return MDB2_OK;
	}

	// }}}
	// {{{ commit()

	/**
	* Commit the database changes done during a transaction that is in
	* progress.
	*
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function commit()
	{
	$this->debug('commit transaction', 'commit');
	if (!$this->in_transaction) {
	return $this->raiseError(MDB2_ERROR, null, null,
	'commit: transaction changes are being auto commited');
	}
	$result = $this->_doQuery('COMMIT;', true);
	if (PEAR::isError($result)) {
	return $result;
	}
	$result = $this->_doQuery('SET COMMIT TRUE;', true);
	if (PEAR::isError($result)) {
	return $result;
	}
	$this->in_transaction = false;
	return MDB2_OK;
	}

	// }}}
	// {{{ rollback()

	/**
	* Cancel any database changes done during a transaction that is in
	* progress.
	*
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function rollback()
	{
	$this->debug('rolling back transaction', 'rollback');
	if (!$this->in_transaction) {
	return $this->raiseError(MDB2_ERROR, null, null,
	'rollback: transactions can not be rolled back when changes are auto committed');
	}
	$result = $this->_doQuery('ROLLBACK;', true);
	if (PEAR::isError($result)) {
	return $result;
	}
	$result = $this->_doQuery('SET COMMIT TRUE;', true);
	if (PEAR::isError($result)) {
	return $result;
	}
	$this->in_transaction = false;
	return MDB2_OK;
	}

	// }}}
	// {{{ connect()

	/**
	* Connect to the database
	*
	* @return true on success, MDB2 Error Object on failure
	**/
	function connect()
	{
	if (is_resource($this->connection)) {
	if (count(array_diff($this->connected_dsn, $this->dsn)) == 0
	&& $this->opened_persistent == $this->options['persistent']
	) {
	return MDB2_OK;
	}
	$this->disconnect(false);
	}

	if (!PEAR::loadExtension($this->phptype)) {
	return $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
	'connect: extension '.$this->phptype.' is not compiled into PHP');
	}

	$params = array(
	$this->dsn['hostspec'] ? $this->dsn['hostspec'] : 'localhost',
	$this->dsn['username'] ? $this->dsn['username'] : null,
	$this->dsn['password'] ? $this->dsn['password'] : null,
	);

	$connect_function = $this->options['persistent'] ? 'fbsql_pconnect' : 'fbsql_connect';

	@ini_set('track_errors', true);
	$php_errormsg = '';
	$connection = @call_user_func_array($connect_function, $params);
	@ini_restore('track_errors');
	if ($connection <= 0) {
	return $this->raiseError(MDB2_ERROR_CONNECT_FAILED);
	}

	$this->connection = $connection;
	$this->connected_dsn = $this->dsn;
	$this->connected_database_name = '';
	$this->opened_persistent = $this->options['persistent'];
	$this->dbsyntax = $this->dsn['dbsyntax'] ? $this->dsn['dbsyntax'] : $this->phptype;

	return MDB2_OK;
	}

	// }}}
	// {{{ disconnect()

	/**
	* Log out and disconnect from the database.
	*
	* @return mixed true on success, false if not connected and error
	* object on error
	* @access public
	*/
	function disconnect($force = true)
	{
	if (is_resource($this->connection)) {
	if (!$this->opened_persistent \|\| $force) {
	@fbsql_close($this->connection);
	}
	$this->connection = 0;
	}
	return MDB2_OK;
	}

	// }}}
	// {{{ _doQuery()

	/**
	* Execute a query
	* @param string $query query
	* @param boolean $isManip if the query is a manipulation query
	* @param resource $connection
	* @param string $database_name
	* @return result or error object
	* @access protected
	*/
	function _doQuery($query, $isManip = false, $connection = null, $database_name = null)
	{
	$this->last_query = $query;
	$this->debug($query, 'query');
	if ($this->options['disable_query']) {
	if ($isManip) {
	return 0;
	}
	return null;
	}

	if (is_null($connection)) {
	$err = $this->connect();
	if (PEAR::isError($err)) {
	return $err;
	}
	$connection = $this->connection;
	}
	if (is_null($database_name)) {
	$database_name = $this->database_name;
	}

	if ($database_name) {
	if ($database_name != $this->connected_database_name) {
	if (!@fbsql_select_db($database_name, $connection)) {
	return $this->raiseError();
	}
	$this->connected_database_name = $database_name;
	}
	}

	$result = @fbsql_query($query, $connection);
	if (!$result) {
	return $this->raiseError();
	}

	if ($isManip) {
	return @fbsql_affected_rows($connection);
	}
	return $result;
	}

	// }}}
	// {{{ _modifyQuery()

	/**
	* Changes a query string for various DBMS specific reasons
	*
	* @param string $query query to modify
	* @return the new (modified) query
	* @access protected
	*/
	function _modifyQuery($query, $isManip, $limit, $offset)
	{
	if ($limit > 0) {
	if ($isManip) {
	return preg_replace('/^([\s(])SELECT(?!\sTOP\s*\()/i',
	"\\1SELECT TOP($limit)", $query);
	} else {
	return preg_replace('/([\s(])SELECT(?!\sTOP\s*\()/i',
	"\\1SELECT TOP($offset,$limit)", $query);
	}
	}
	// Add ; to the end of the query. This is required by FrontBase
	return $query.';';
	}

	// }}}
	// {{{ nextID()

	/**
	* returns the next free id of a sequence
	*
	* @param string $seq_name name of the sequence
	* @param boolean $ondemand when true the seqence is
	* automatic created, if it
	* not exists
	*
	* @return mixed MDB2 Error Object or id
	* @access public
	*/
	function nextID($seq_name, $ondemand = true)
	{
	$sequence_name = $this->getSequenceName($seq_name);
	$query = "INSERT INTO $sequence_name (".$this->options['seqcol_name'].") VALUES (NULL);";
	$this->expectError(MDB2_ERROR_NOSUCHTABLE);
	$result = $this->_doQuery($query, true);
	$this->popExpect();
	if (PEAR::isError($result)) {
	if ($ondemand && $result->getCode() == MDB2_ERROR_NOSUCHTABLE) {
	$this->loadModule('Manager');
	// Since we are creating the sequence on demand
	// we know the first id = 1 so initialize the
	// sequence at 2
	$result = $this->manager->createSequence($seq_name, 2);
	if (PEAR::isError($result)) {
	return $this->raiseError(MDB2_ERROR, null, null,
	'nextID: on demand sequence '.$seq_name.' could not be created');
	} else {
	// First ID of a newly created sequence is 1
	return 1;
	}
	}
	return $result;
	}
	$value = $this->queryOne("SELECT UNIQUE FROM $sequence_name", 'integer');
	if (is_numeric($value)) {
	$query = "DELETE FROM $sequence_name WHERE ".$this->options['seqcol_name']." < $value;";
	$result = $this->_doQuery($query, true);
	if (PEAR::isError($result)) {
	$this->warnings[] = 'nextID: could not delete previous sequence table values from '.$seq_name;
	}
	}
	return $value;
	}

	// }}}
	// {{{ lastInsertID()

	/**
	* returns the autoincrement ID if supported or $id
	*
	* @param mixed $id value as returned by getBeforeId()
	* @param string $table name of the table into which a new row was inserted
	* @return mixed MDB2 Error Object or id
	* @access public
	*/
	function lastInsertID($table = null, $field = null)
	{
	$value = @fbsql_insert_id($this->connection);
	if (!$value) {
	return $this->raiseError();
	}
	return $value;
	}

	// }}}
	// {{{ currID()

	/**
	* returns the current id of a sequence
	*
	* @param string $seq_name name of the sequence
	* @return mixed MDB2 Error Object or id
	* @access public
	*/
	function currID($seq_name)
	{
	$sequence_name = $this->getSequenceName($seq_name);
	$query = "SELECT MAX(".$this->options['seqcol_name'].") FROM $sequence_name";
	return $this->queryOne($query, 'integer');
	}
	}

	class MDB2_Result_fbsql extends MDB2_Result_Common
	{
	// }}}
	// {{{ fetchRow()

	/**
	* Fetch a row and insert the data into an existing array.
	*
	* @param int $fetchmode how the array data should be indexed
	* @param int $rownum number of the row where the data can be found
	* @return int data array on success, a MDB2 error on failure
	* @access public
	*/
	function &fetchRow($fetchmode = MDB2_FETCHMODE_DEFAULT, $rownum = null)
	{
	if (!is_null($rownum)) {
	$seek = $this->seek($rownum);
	if (PEAR::isError($seek)) {
	return $seek;
	}
	}
	if ($fetchmode == MDB2_FETCHMODE_DEFAULT) {
	$fetchmode = $this->db->fetchmode;
	}
	if ($fetchmode & MDB2_FETCHMODE_ASSOC) {
	$row = @fbsql_fetch_assoc($this->result);
	if (is_array($row)
	&& $this->db->options['portability'] & MDB2_PORTABILITY_FIX_CASE
	) {
	$row = array_change_key_case($row, $this->db->options['field_case']);
	}
	} else {
	$row = @fbsql_fetch_row($this->result);
	}
	if (!$row) {
	if (is_null($this->result)) {
	$err =& $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'fetchRow: resultset has already been freed');
	return $err;
	}
	$null = null;
	return $null;
	}
	if ($this->db->options['portability'] & MDB2_PORTABILITY_EMPTY_TO_NULL) {
	$this->db->_fixResultArrayValues($row, MDB2_PORTABILITY_EMPTY_TO_NULL);
	}
	if (!empty($this->values)) {
	$this->_assignBindColumns($row);
	}
	if (!empty($this->types)) {
	$row = $this->db->datatype->convertResultRow($this->types, $row);
	}
	if ($fetchmode === MDB2_FETCHMODE_OBJECT) {
	$object_class = $this->db->options['fetch_class'];
	if ($object_class == 'stdClass') {
	$row = (object) $row;
	} else {
	$row = &new $object_class($row);
	}
	}
	++$this->rownum;
	return $row;
	}

	// }}}
	// {{{ _getColumnNames()

	/**
	* Retrieve the names of columns returned by the DBMS in a query result.
	*
	* @return mixed an associative array variable
	* that will hold the names of columns. The
	* indexes of the array are the column names
	* mapped to lower case and the values are the
	* respective numbers of the columns starting
	* from 0. Some DBMS may not return any
	* columns when the result set does not
	* contain any rows.
	*
	* a MDB2 error on failure
	* @access private
	*/
	function _getColumnNames()
	{
	$columns = array();
	$numcols = $this->numCols();
	if (PEAR::isError($numcols)) {
	return $numcols;
	}
	for ($column = 0; $column < $numcols; $column++) {
	$column_name = @fbsql_field_name($this->result, $column);
	$columns[$column_name] = $column;
	}
	if ($this->db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
	$columns = array_change_key_case($columns, $this->db->options['field_case']);
	}
	return $columns;
	}

	// }}}
	// {{{ numCols()

	/**
	* Count the number of columns returned by the DBMS in a query result.
	*
	* @return mixed integer value with the number of columns, a MDB2 error
	* on failure
	* @access public
	*/
	function numCols()
	{
	$cols = @fbsql_num_fields($this->result);
	if (is_null($cols)) {
	if (is_null($this->result)) {
	return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'numCols: resultset has already been freed');
	}
	return $this->db->raiseError();
	}
	return $cols;
	}

	// }}}
	// {{{ nextResult()

	/**
	* Move the internal result pointer to the next available result
	* Currently not supported
	*
	* @return true if a result is available otherwise return false
	* @access public
	*/
	function nextResult()
	{
	if (is_null($this->result)) {
	return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'nextResult: resultset has already been freed');
	}
	return @fbsql_next_result($this->result);
	}

	// }}}
	// {{{ free()

	/**
	* Free the internal resources associated with result.
	*
	* @return boolean true on success, false if result is invalid
	* @access public
	*/
	function free()
	{
	$free = @fbsql_free_result($this->result);
	if (!$free) {
	if (is_null($this->result)) {
	return MDB2_OK;
	}
	return $this->db->raiseError();
	}
	$this->result = null;
	return MDB2_OK;
	}
	}

	class MDB2_BufferedResult_fbsql extends MDB2_Result_fbsql
	{
	// }}}
	// {{{ seek()

	/**
	* seek to a specific row in a result set
	*
	* @param int $rownum number of the row where the data can be found
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function seek($rownum = 0)
	{
	if ($this->rownum != ($rownum - 1) && !@fbsql_data_seek($this->result, $rownum)) {
	if (is_null($this->result)) {
	return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'seek: resultset has already been freed');
	}
	return $this->db->raiseError(MDB2_ERROR_INVALID, null, null,
	'seek: tried to seek to an invalid row number ('.$rownum.')');
	}
	$this->rownum = $rownum - 1;
	return MDB2_OK;
	}

	// }}}
	// {{{ valid()

	/**
	* check if the end of the result set has been reached
	*
	* @return mixed true or false on sucess, a MDB2 error on failure
	* @access public
	*/
	function valid()
	{
	$numrows = $this->numRows();
	if (PEAR::isError($numrows)) {
	return $numrows;
	}
	return $this->rownum < ($numrows - 1);
	}

	// }}}
	// {{{ numRows()

	/**
	* returns the number of rows in a result object
	*
	* @return mixed MDB2 Error Object or the number of rows
	* @access public
	*/
	function numRows()
	{
	$rows = @fbsql_num_rows($this->result);
	if (is_null($rows)) {
	if (is_null($this->result)) {
	return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'numRows: resultset has already been freed');
	}
	return $this->raiseError();
	}
	return $rows;
	}
	}

	class MDB2_Statement_fbsql extends MDB2_Statement_Common
	{

	}

	?>

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