ibase.php
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ibase.php
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	<?php

	/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

	/**
	* The PEAR DB driver for PHP's interbase extension
	* for interacting with Interbase and Firebird databases
	*
	* While this class works with PHP 4, PHP's InterBase extension is
	* unstable in PHP 4. Use PHP 5.
	*
	* PHP versions 4 and 5
	*
	* LICENSE: This source file is subject to version 3.0 of the PHP license
	* that is available through the world-wide-web at the following URI:
	* http://www.php.net/license/3_0.txt. If you did not receive a copy of
	* the PHP License and are unable to obtain it through the web, please
	* send a note to license@php.net so we can mail you a copy immediately.
	*
	* @category Database
	* @package DB
	* @author Sterling Hughes <sterling@php.net>
	* @author Daniel Convissor <danielc@php.net>
	* @copyright 1997-2007 The PHP Group
	* @license http://www.php.net/license/3_0.txt PHP License 3.0
	* @version CVS: $Id$
	* @link http://pear.php.net/package/DB
	*/

	/**
	* Obtain the DB_common class so it can be extended from
	*/
	require_once 'DB/common.php';

	/**
	* The methods PEAR DB uses to interact with PHP's interbase extension
	* for interacting with Interbase and Firebird databases
	*
	* These methods overload the ones declared in DB_common.
	*
	* While this class works with PHP 4, PHP's InterBase extension is
	* unstable in PHP 4. Use PHP 5.
	*
	* NOTICE: limitQuery() only works for Firebird.
	*
	* @category Database
	* @package DB
	* @author Sterling Hughes <sterling@php.net>
	* @author Daniel Convissor <danielc@php.net>
	* @copyright 1997-2007 The PHP Group
	* @license http://www.php.net/license/3_0.txt PHP License 3.0
	* @version Release: 1.7.13
	* @link http://pear.php.net/package/DB
	* @since Class became stable in Release 1.7.0
	*/
	class DB_ibase extends DB_common
	{
	// {{{ properties

	/**
	* The DB driver type (mysql, oci8, odbc, etc.)
	* @var string
	*/
	var $phptype = 'ibase';

	/**
	* The database syntax variant to be used (db2, access, etc.), if any
	* @var string
	*/
	var $dbsyntax = 'ibase';

	/**
	* The capabilities of this DB implementation
	*
	* The 'new_link' element contains the PHP version that first provided
	* new_link support for this DBMS. Contains false if it's unsupported.
	*
	* Meaning of the 'limit' element:
	* + 'emulate' = emulate with fetch row by number
	* + 'alter' = alter the query
	* + false = skip rows
	*
	* NOTE: only firebird supports limit.
	*
	* @var array
	*/
	var $features = array(
	'limit' => false,
	'new_link' => false,
	'numrows' => 'emulate',
	'pconnect' => true,
	'prepare' => true,
	'ssl' => false,
	'transactions' => true,
	);

	/**
	* A mapping of native error codes to DB error codes
	* @var array
	*/
	var $errorcode_map = array(
	-104 => DB_ERROR_SYNTAX,
	-150 => DB_ERROR_ACCESS_VIOLATION,
	-151 => DB_ERROR_ACCESS_VIOLATION,
	-155 => DB_ERROR_NOSUCHTABLE,
	-157 => DB_ERROR_NOSUCHFIELD,
	-158 => DB_ERROR_VALUE_COUNT_ON_ROW,
	-170 => DB_ERROR_MISMATCH,
	-171 => DB_ERROR_MISMATCH,
	-172 => DB_ERROR_INVALID,
	// -204 => // Covers too many errors, need to use regex on msg
	-205 => DB_ERROR_NOSUCHFIELD,
	-206 => DB_ERROR_NOSUCHFIELD,
	-208 => DB_ERROR_INVALID,
	-219 => DB_ERROR_NOSUCHTABLE,
	-297 => DB_ERROR_CONSTRAINT,
	-303 => DB_ERROR_INVALID,
	-413 => DB_ERROR_INVALID_NUMBER,
	-530 => DB_ERROR_CONSTRAINT,
	-551 => DB_ERROR_ACCESS_VIOLATION,
	-552 => DB_ERROR_ACCESS_VIOLATION,
	// -607 => // Covers too many errors, need to use regex on msg
	-625 => DB_ERROR_CONSTRAINT_NOT_NULL,
	-803 => DB_ERROR_CONSTRAINT,
	-804 => DB_ERROR_VALUE_COUNT_ON_ROW,
	// -902 => // Covers too many errors, need to use regex on msg
	-904 => DB_ERROR_CONNECT_FAILED,
	-922 => DB_ERROR_NOSUCHDB,
	-923 => DB_ERROR_CONNECT_FAILED,
	-924 => DB_ERROR_CONNECT_FAILED
	);

	/**
	* The raw database connection created by PHP
	* @var resource
	*/
	var $connection;

	/**
	* The DSN information for connecting to a database
	* @var array
	*/
	var $dsn = array();


	/**
	* The number of rows affected by a data manipulation query
	* @var integer
	* @access private
	*/
	var $affected = 0;

	/**
	* Should data manipulation queries be committed automatically?
	* @var bool
	* @access private
	*/
	var $autocommit = true;

	/**
	* The prepared statement handle from the most recently executed statement
	*
	* {@internal Mainly here because the InterBase/Firebird API is only
	* able to retrieve data from result sets if the statemnt handle is
	* still in scope.}}
	*
	* @var resource
	*/
	var $last_stmt;

	/**
	* Is the given prepared statement a data manipulation query?
	* @var array
	* @access private
	*/
	var $manip_query = array();


	// }}}
	// {{{ constructor

	/**
	* This constructor calls <kbd>$this->DB_common()</kbd>
	*
	* @return void
	*/
	function DB_ibase()
	{
	$this->DB_common();
	}

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

	/**
	* Connect to the database server, log in and open the database
	*
	* Don't call this method directly. Use DB::connect() instead.
	*
	* PEAR DB's ibase driver supports the following extra DSN options:
	* + buffers The number of database buffers to allocate for the
	* server-side cache.
	* + charset The default character set for a database.
	* + dialect The default SQL dialect for any statement
	* executed within a connection. Defaults to the
	* highest one supported by client libraries.
	* Functional only with InterBase 6 and up.
	* + role Functional only with InterBase 5 and up.
	*
	* @param array $dsn the data source name
	* @param bool $persistent should the connection be persistent?
	*
	* @return int DB_OK on success. A DB_Error object on failure.
	*/
	function connect($dsn, $persistent = false)
	{
	if (!PEAR::loadExtension('interbase')) {
	return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
	}

	$this->dsn = $dsn;
	if ($dsn['dbsyntax']) {
	$this->dbsyntax = $dsn['dbsyntax'];
	}
	if ($this->dbsyntax == 'firebird') {
	$this->features['limit'] = 'alter';
	}

	$params = array(
	$dsn['hostspec']
	? ($dsn['hostspec'] . ':' . $dsn['database'])
	: $dsn['database'],
	$dsn['username'] ? $dsn['username'] : null,
	$dsn['password'] ? $dsn['password'] : null,
	isset($dsn['charset']) ? $dsn['charset'] : null,
	isset($dsn['buffers']) ? $dsn['buffers'] : null,
	isset($dsn['dialect']) ? $dsn['dialect'] : null,
	isset($dsn['role']) ? $dsn['role'] : null,
	);

	$connect_function = $persistent ? 'ibase_pconnect' : 'ibase_connect';

	$this->connection = @call_user_func_array($connect_function, $params);
	if (!$this->connection) {
	return $this->ibaseRaiseError(DB_ERROR_CONNECT_FAILED);
	}
	return DB_OK;
	}

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

	/**
	* Disconnects from the database server
	*
	* @return bool TRUE on success, FALSE on failure
	*/
	function disconnect()
	{
	$ret = @ibase_close($this->connection);
	$this->connection = null;
	return $ret;
	}

	// }}}
	// {{{ simpleQuery()

	/**
	* Sends a query to the database server
	*
	* @param string the SQL query string
	*
	* @return mixed + a PHP result resrouce for successful SELECT queries
	* + the DB_OK constant for other successful queries
	* + a DB_Error object on failure
	*/
	function simpleQuery($query)
	{
	$ismanip = $this->_checkManip($query);
	$this->last_query = $query;
	$query = $this->modifyQuery($query);
	$result = @ibase_query($this->connection, $query);

	if (!$result) {
	return $this->ibaseRaiseError();
	}
	if ($this->autocommit && $ismanip) {
	@ibase_commit($this->connection);
	}
	if ($ismanip) {
	$this->affected = $result;
	return DB_OK;
	} else {
	$this->affected = 0;
	return $result;
	}
	}

	// }}}
	// {{{ modifyLimitQuery()

	/**
	* Adds LIMIT clauses to a query string according to current DBMS standards
	*
	* Only works with Firebird.
	*
	* @param string $query the query to modify
	* @param int $from the row to start to fetching (0 = the first row)
	* @param int $count the numbers of rows to fetch
	* @param mixed $params array, string or numeric data to be used in
	* execution of the statement. Quantity of items
	* passed must match quantity of placeholders in
	* query: meaning 1 placeholder for non-array
	* parameters or 1 placeholder per array element.
	*
	* @return string the query string with LIMIT clauses added
	*
	* @access protected
	*/
	function modifyLimitQuery($query, $from, $count, $params = array())
	{
	if ($this->dsn['dbsyntax'] == 'firebird') {
	$query = preg_replace('/^([\s(])*SELECT/i',
	"SELECT FIRST $count SKIP $from", $query);
	}
	return $query;
	}

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

	/**
	* Move the internal ibase result pointer to the next available result
	*
	* @param a valid fbsql result resource
	*
	* @access public
	*
	* @return true if a result is available otherwise return false
	*/
	function nextResult($result)
	{
	return false;
	}

	// }}}
	// {{{ fetchInto()

	/**
	* Places a row from the result set into the given array
	*
	* Formating of the array and the data therein are configurable.
	* See DB_result::fetchInto() for more information.
	*
	* This method is not meant to be called directly. Use
	* DB_result::fetchInto() instead. It can't be declared "protected"
	* because DB_result is a separate object.
	*
	* @param resource $result the query result resource
	* @param array $arr the referenced array to put the data in
	* @param int $fetchmode how the resulting array should be indexed
	* @param int $rownum the row number to fetch (0 = first row)
	*
	* @return mixed DB_OK on success, NULL when the end of a result set is
	* reached or on failure
	*
	* @see DB_result::fetchInto()
	*/
	function fetchInto($result, &$arr, $fetchmode, $rownum = null)
	{
	if ($rownum !== null) {
	return $this->ibaseRaiseError(DB_ERROR_NOT_CAPABLE);
	}
	if ($fetchmode & DB_FETCHMODE_ASSOC) {
	if (function_exists('ibase_fetch_assoc')) {
	$arr = @ibase_fetch_assoc($result);
	} else {
	$arr = get_object_vars(ibase_fetch_object($result));
	}
	if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE && $arr) {
	$arr = array_change_key_case($arr, CASE_LOWER);
	}
	} else {
	$arr = @ibase_fetch_row($result);
	}
	if (!$arr) {
	return null;
	}
	if ($this->options['portability'] & DB_PORTABILITY_RTRIM) {
	$this->_rtrimArrayValues($arr);
	}
	if ($this->options['portability'] & DB_PORTABILITY_NULL_TO_EMPTY) {
	$this->_convertNullArrayValuesToEmpty($arr);
	}
	return DB_OK;
	}

	// }}}
	// {{{ freeResult()

	/**
	* Deletes the result set and frees the memory occupied by the result set
	*
	* This method is not meant to be called directly. Use
	* DB_result::free() instead. It can't be declared "protected"
	* because DB_result is a separate object.
	*
	* @param resource $result PHP's query result resource
	*
	* @return bool TRUE on success, FALSE if $result is invalid
	*
	* @see DB_result::free()
	*/
	function freeResult($result)
	{
	return is_resource($result) ? ibase_free_result($result) : false;
	}

	// }}}
	// {{{ freeQuery()

	function freeQuery($query)
	{
	return is_resource($query) ? ibase_free_query($query) : false;
	}

	// }}}
	// {{{ affectedRows()

	/**
	* Determines the number of rows affected by a data maniuplation query
	*
	* 0 is returned for queries that don't manipulate data.
	*
	* @return int the number of rows. A DB_Error object on failure.
	*/
	function affectedRows()
	{
	if (is_integer($this->affected)) {
	return $this->affected;
	}
	return $this->ibaseRaiseError(DB_ERROR_NOT_CAPABLE);
	}

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

	/**
	* Gets the number of columns in a result set
	*
	* This method is not meant to be called directly. Use
	* DB_result::numCols() instead. It can't be declared "protected"
	* because DB_result is a separate object.
	*
	* @param resource $result PHP's query result resource
	*
	* @return int the number of columns. A DB_Error object on failure.
	*
	* @see DB_result::numCols()
	*/
	function numCols($result)
	{
	$cols = @ibase_num_fields($result);
	if (!$cols) {
	return $this->ibaseRaiseError();
	}
	return $cols;
	}

	// }}}
	// {{{ prepare()

	/**
	* Prepares a query for multiple execution with execute().
	*
	* prepare() requires a generic query as string like <code>
	* INSERT INTO numbers VALUES (?, ?, ?)
	* </code>. The <kbd>?</kbd> characters are placeholders.
	*
	* Three types of placeholders can be used:
	* + <kbd>?</kbd> a quoted scalar value, i.e. strings, integers
	* + <kbd>!</kbd> value is inserted 'as is'
	* + <kbd>&</kbd> requires a file name. The file's contents get
	* inserted into the query (i.e. saving binary
	* data in a db)
	*
	* Use backslashes to escape placeholder characters if you don't want
	* them to be interpreted as placeholders. Example: <code>
	* "UPDATE foo SET col=? WHERE col='over \& under'"
	* </code>
	*
	* @param string $query query to be prepared
	* @return mixed DB statement resource on success. DB_Error on failure.
	*/
	function prepare($query)
	{
	$tokens = preg_split('/((?<!\\\)[&?!])/', $query, -1,
	PREG_SPLIT_DELIM_CAPTURE);
	$token = 0;
	$types = array();
	$newquery = '';

	foreach ($tokens as $key => $val) {
	switch ($val) {
	case '?':
	$types[$token++] = DB_PARAM_SCALAR;
	break;
	case '&':
	$types[$token++] = DB_PARAM_OPAQUE;
	break;
	case '!':
	$types[$token++] = DB_PARAM_MISC;
	break;
	default:
	$tokens[$key] = preg_replace('/\\\([&?!])/', "\\1", $val);
	$newquery .= $tokens[$key] . '?';
	}
	}

	$newquery = substr($newquery, 0, -1);
	$this->last_query = $query;
	$newquery = $this->modifyQuery($newquery);
	$stmt = @ibase_prepare($this->connection, $newquery);

	if ($stmt === false) {
	$stmt = $this->ibaseRaiseError();
	} else {
	$this->prepare_types[(int)$stmt] = $types;
	$this->manip_query[(int)$stmt] = DB::isManip($query);
	}

	return $stmt;
	}

	// }}}
	// {{{ execute()

	/**
	* Executes a DB statement prepared with prepare().
	*
	* @param resource $stmt a DB statement resource returned from prepare()
	* @param mixed $data array, string or numeric data to be used in
	* execution of the statement. Quantity of items
	* passed must match quantity of placeholders in
	* query: meaning 1 for non-array items or the
	* quantity of elements in the array.
	* @return object a new DB_Result or a DB_Error when fail
	* @see DB_ibase::prepare()
	* @access public
	*/
	function &execute($stmt, $data = array())
	{
	$data = (array)$data;
	$this->last_parameters = $data;

	$types = $this->prepare_types[(int)$stmt];
	if (count($types) != count($data)) {
	$tmp = $this->raiseError(DB_ERROR_MISMATCH);
	return $tmp;
	}

	$i = 0;
	foreach ($data as $key => $value) {
	if ($types[$i] == DB_PARAM_MISC) {
	/*
	* ibase doesn't seem to have the ability to pass a
	* parameter along unchanged, so strip off quotes from start
	* and end, plus turn two single quotes to one single quote,
	* in order to avoid the quotes getting escaped by
	* ibase and ending up in the database.
	*/
	$data[$key] = preg_replace("/^'(.*)'$/", "\\1", $data[$key]);
	$data[$key] = str_replace("''", "'", $data[$key]);
	} elseif ($types[$i] == DB_PARAM_OPAQUE) {
	$fp = @fopen($data[$key], 'rb');
	if (!$fp) {
	$tmp = $this->raiseError(DB_ERROR_ACCESS_VIOLATION);
	return $tmp;
	}
	$data[$key] = fread($fp, filesize($data[$key]));
	fclose($fp);
	}
	$i++;
	}

	array_unshift($data, $stmt);

	$res = call_user_func_array('ibase_execute', $data);
	if (!$res) {
	$tmp = $this->ibaseRaiseError();
	return $tmp;
	}
	/* XXX need this?
	if ($this->autocommit && $this->manip_query[(int)$stmt]) {
	@ibase_commit($this->connection);
	}*/
	$this->last_stmt = $stmt;
	if ($this->manip_query[(int)$stmt] \|\| $this->_next_query_manip) {
	$this->_last_query_manip = true;
	$this->_next_query_manip = false;
	$tmp = DB_OK;
	} else {
	$this->_last_query_manip = false;
	$tmp = new DB_result($this, $res);
	}
	return $tmp;
	}

	/**
	* Frees the internal resources associated with a prepared query
	*
	* @param resource $stmt the prepared statement's PHP resource
	* @param bool $free_resource should the PHP resource be freed too?
	* Use false if you need to get data
	* from the result set later.
	*
	* @return bool TRUE on success, FALSE if $result is invalid
	*
	* @see DB_ibase::prepare()
	*/
	function freePrepared($stmt, $free_resource = true)
	{
	if (!is_resource($stmt)) {
	return false;
	}
	if ($free_resource) {
	@ibase_free_query($stmt);
	}
	unset($this->prepare_tokens[(int)$stmt]);
	unset($this->prepare_types[(int)$stmt]);
	unset($this->manip_query[(int)$stmt]);
	return true;
	}

	// }}}
	// {{{ autoCommit()

	/**
	* Enables or disables automatic commits
	*
	* @param bool $onoff true turns it on, false turns it off
	*
	* @return int DB_OK on success. A DB_Error object if the driver
	* doesn't support auto-committing transactions.
	*/
	function autoCommit($onoff = false)
	{
	$this->autocommit = $onoff ? 1 : 0;
	return DB_OK;
	}

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

	/**
	* Commits the current transaction
	*
	* @return int DB_OK on success. A DB_Error object on failure.
	*/
	function commit()
	{
	return @ibase_commit($this->connection);
	}

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

	/**
	* Reverts the current transaction
	*
	* @return int DB_OK on success. A DB_Error object on failure.
	*/
	function rollback()
	{
	return @ibase_rollback($this->connection);
	}

	// }}}
	// {{{ transactionInit()

	function transactionInit($trans_args = 0)
	{
	return $trans_args
	? @ibase_trans($trans_args, $this->connection)
	: @ibase_trans();
	}

	// }}}
	// {{{ nextId()

	/**
	* Returns the next free id in a sequence
	*
	* @param string $seq_name name of the sequence
	* @param boolean $ondemand when true, the seqence is automatically
	* created if it does not exist
	*
	* @return int the next id number in the sequence.
	* A DB_Error object on failure.
	*
	* @see DB_common::nextID(), DB_common::getSequenceName(),
	* DB_ibase::createSequence(), DB_ibase::dropSequence()
	*/
	function nextId($seq_name, $ondemand = true)
	{
	$sqn = strtoupper($this->getSequenceName($seq_name));
	$repeat = 0;
	do {
	$this->pushErrorHandling(PEAR_ERROR_RETURN);
	$result = $this->query("SELECT GEN_ID(${sqn}, 1) "
	. 'FROM RDB$GENERATORS '
	. "WHERE RDB\$GENERATOR_NAME='${sqn}'");
	$this->popErrorHandling();
	if ($ondemand && DB::isError($result)) {
	$repeat = 1;
	$result = $this->createSequence($seq_name);
	if (DB::isError($result)) {
	return $result;
	}
	} else {
	$repeat = 0;
	}
	} while ($repeat);
	if (DB::isError($result)) {
	return $this->raiseError($result);
	}
	$arr = $result->fetchRow(DB_FETCHMODE_ORDERED);
	$result->free();
	return $arr[0];
	}

	// }}}
	// {{{ createSequence()

	/**
	* Creates a new sequence
	*
	* @param string $seq_name name of the new sequence
	*
	* @return int DB_OK on success. A DB_Error object on failure.
	*
	* @see DB_common::createSequence(), DB_common::getSequenceName(),
	* DB_ibase::nextID(), DB_ibase::dropSequence()
	*/
	function createSequence($seq_name)
	{
	$sqn = strtoupper($this->getSequenceName($seq_name));
	$this->pushErrorHandling(PEAR_ERROR_RETURN);
	$result = $this->query("CREATE GENERATOR ${sqn}");
	$this->popErrorHandling();

	return $result;
	}

	// }}}
	// {{{ dropSequence()

	/**
	* Deletes a sequence
	*
	* @param string $seq_name name of the sequence to be deleted
	*
	* @return int DB_OK on success. A DB_Error object on failure.
	*
	* @see DB_common::dropSequence(), DB_common::getSequenceName(),
	* DB_ibase::nextID(), DB_ibase::createSequence()
	*/
	function dropSequence($seq_name)
	{
	return $this->query('DELETE FROM RDB$GENERATORS '
	. "WHERE RDB\$GENERATOR_NAME='"
	. strtoupper($this->getSequenceName($seq_name))
	. "'");
	}

	// }}}
	// {{{ _ibaseFieldFlags()

	/**
	* Get the column's flags
	*
	* Supports "primary_key", "unique_key", "not_null", "default",
	* "computed" and "blob".
	*
	* @param string $field_name the name of the field
	* @param string $table_name the name of the table
	*
	* @return string the flags
	*
	* @access private
	*/
	function _ibaseFieldFlags($field_name, $table_name)
	{
	$sql = 'SELECT R.RDB$CONSTRAINT_TYPE CTYPE'
	.' FROM RDB$INDEX_SEGMENTS I'
	.' JOIN RDB$RELATION_CONSTRAINTS R ON I.RDB$INDEX_NAME=R.RDB$INDEX_NAME'
	.' WHERE I.RDB$FIELD_NAME=\'' . $field_name . '\''
	.' AND UPPER(R.RDB$RELATION_NAME)=\'' . strtoupper($table_name) . '\'';

	$result = @ibase_query($this->connection, $sql);
	if (!$result) {
	return $this->ibaseRaiseError();
	}

	$flags = '';
	if ($obj = @ibase_fetch_object($result)) {
	@ibase_free_result($result);
	if (isset($obj->CTYPE) && trim($obj->CTYPE) == 'PRIMARY KEY') {
	$flags .= 'primary_key ';
	}
	if (isset($obj->CTYPE) && trim($obj->CTYPE) == 'UNIQUE') {
	$flags .= 'unique_key ';
	}
	}

	$sql = 'SELECT R.RDB$NULL_FLAG AS NFLAG,'
	.' R.RDB$DEFAULT_SOURCE AS DSOURCE,'
	.' F.RDB$FIELD_TYPE AS FTYPE,'
	.' F.RDB$COMPUTED_SOURCE AS CSOURCE'
	.' FROM RDB$RELATION_FIELDS R '
	.' JOIN RDB$FIELDS F ON R.RDB$FIELD_SOURCE=F.RDB$FIELD_NAME'
	.' WHERE UPPER(R.RDB$RELATION_NAME)=\'' . strtoupper($table_name) . '\''
	.' AND R.RDB$FIELD_NAME=\'' . $field_name . '\'';

	$result = @ibase_query($this->connection, $sql);
	if (!$result) {
	return $this->ibaseRaiseError();
	}
	if ($obj = @ibase_fetch_object($result)) {
	@ibase_free_result($result);
	if (isset($obj->NFLAG)) {
	$flags .= 'not_null ';
	}
	if (isset($obj->DSOURCE)) {
	$flags .= 'default ';
	}
	if (isset($obj->CSOURCE)) {
	$flags .= 'computed ';
	}
	if (isset($obj->FTYPE) && $obj->FTYPE == 261) {
	$flags .= 'blob ';
	}
	}

	return trim($flags);
	}

	// }}}
	// {{{ ibaseRaiseError()

	/**
	* Produces a DB_Error object regarding the current problem
	*
	* @param int $errno if the error is being manually raised pass a
	* DB_ERROR* constant here. If this isn't passed
	* the error information gathered from the DBMS.
	*
	* @return object the DB_Error object
	*
	* @see DB_common::raiseError(),
	* DB_ibase::errorNative(), DB_ibase::errorCode()
	*/
	function &ibaseRaiseError($errno = null)
	{
	if ($errno === null) {
	$errno = $this->errorCode($this->errorNative());
	}
	$tmp = $this->raiseError($errno, null, null, null, @ibase_errmsg());
	return $tmp;
	}

	// }}}
	// {{{ errorNative()

	/**
	* Gets the DBMS' native error code produced by the last query
	*
	* @return int the DBMS' error code. NULL if there is no error code.
	*
	* @since Method available since Release 1.7.0
	*/
	function errorNative()
	{
	if (function_exists('ibase_errcode')) {
	return @ibase_errcode();
	}
	if (preg_match('/^Dynamic SQL Error SQL error code = ([0-9-]+)/i',
	@ibase_errmsg(), $m)) {
	return (int)$m[1];
	}
	return null;
	}

	// }}}
	// {{{ errorCode()

	/**
	* Maps native error codes to DB's portable ones
	*
	* @param int $nativecode the error code returned by the DBMS
	*
	* @return int the portable DB error code. Return DB_ERROR if the
	* current driver doesn't have a mapping for the
	* $nativecode submitted.
	*
	* @since Method available since Release 1.7.0
	*/
	function errorCode($nativecode = null)
	{
	if (isset($this->errorcode_map[$nativecode])) {
	return $this->errorcode_map[$nativecode];
	}

	static $error_regexps;
	if (!isset($error_regexps)) {
	$error_regexps = array(
	'/generator .* is not defined/'
	=> DB_ERROR_SYNTAX, // for compat. w ibase_errcode()
	'/table.*(not exist\|not found\|unknown)/i'
	=> DB_ERROR_NOSUCHTABLE,
	'/table .* already exists/i'
	=> DB_ERROR_ALREADY_EXISTS,
	'/unsuccessful metadata update .* failed attempt to store duplicate value/i'
	=> DB_ERROR_ALREADY_EXISTS,
	'/unsuccessful metadata update .* not found/i'
	=> DB_ERROR_NOT_FOUND,
	'/validation error for column .* value "\\\* null/i'
	=> DB_ERROR_CONSTRAINT_NOT_NULL,
	'/violation of [\w ]+ constraint/i'
	=> DB_ERROR_CONSTRAINT,
	'/conversion error from string/i'
	=> DB_ERROR_INVALID_NUMBER,
	'/no permission for/i'
	=> DB_ERROR_ACCESS_VIOLATION,
	'/arithmetic exception, numeric overflow, or string truncation/i'
	=> DB_ERROR_INVALID,
	'/feature is not supported/i'
	=> DB_ERROR_NOT_CAPABLE,
	);
	}

	$errormsg = @ibase_errmsg();
	foreach ($error_regexps as $regexp => $code) {
	if (preg_match($regexp, $errormsg)) {
	return $code;
	}
	}
	return DB_ERROR;
	}

	// }}}
	// {{{ tableInfo()

	/**
	* Returns information about a table or a result set
	*
	* NOTE: only supports 'table' and 'flags' if <var>$result</var>
	* is a table name.
	*
	* @param object\|string $result DB_result object from a query or a
	* string containing the name of a table.
	* While this also accepts a query result
	* resource identifier, this behavior is
	* deprecated.
	* @param int $mode a valid tableInfo mode
	*
	* @return array an associative array with the information requested.
	* A DB_Error object on failure.
	*
	* @see DB_common::tableInfo()
	*/
	function tableInfo($result, $mode = null)
	{
	if (is_string($result)) {
	/*
	* Probably received a table name.
	* Create a result resource identifier.
	*/
	$id = @ibase_query($this->connection,
	"SELECT * FROM $result WHERE 1=0");
	$got_string = true;
	} elseif (isset($result->result)) {
	/*
	* Probably received a result object.
	* Extract the result resource identifier.
	*/
	$id = $result->result;
	$got_string = false;
	} else {
	/*
	* Probably received a result resource identifier.
	* Copy it.
	* Deprecated. Here for compatibility only.
	*/
	$id = $result;
	$got_string = false;
	}

	if (!is_resource($id)) {
	return $this->ibaseRaiseError(DB_ERROR_NEED_MORE_DATA);
	}

	if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
	$case_func = 'strtolower';
	} else {
	$case_func = 'strval';
	}

	$count = @ibase_num_fields($id);
	$res = array();

	if ($mode) {
	$res['num_fields'] = $count;
	}

	for ($i = 0; $i < $count; $i++) {
	$info = @ibase_field_info($id, $i);
	$res[$i] = array(
	'table' => $got_string ? $case_func($result) : '',
	'name' => $case_func($info['name']),
	'type' => $info['type'],
	'len' => $info['length'],
	'flags' => ($got_string)
	? $this->_ibaseFieldFlags($info['name'], $result)
	: '',
	);
	if ($mode & DB_TABLEINFO_ORDER) {
	$res['order'][$res[$i]['name']] = $i;
	}
	if ($mode & DB_TABLEINFO_ORDERTABLE) {
	$res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
	}
	}

	// free the result only if we were called on a table
	if ($got_string) {
	@ibase_free_result($id);
	}
	return $res;
	}

	// }}}
	// {{{ getSpecialQuery()

	/**
	* Obtains the query string needed for listing a given type of objects
	*
	* @param string $type the kind of objects you want to retrieve
	*
	* @return string the SQL query string or null if the driver doesn't
	* support the object type requested
	*
	* @access protected
	* @see DB_common::getListOf()
	*/
	function getSpecialQuery($type)
	{
	switch ($type) {
	case 'tables':
	return 'SELECT DISTINCT R.RDB$RELATION_NAME FROM '
	. 'RDB$RELATION_FIELDS R WHERE R.RDB$SYSTEM_FLAG=0';
	case 'views':
	return 'SELECT DISTINCT RDB$VIEW_NAME from RDB$VIEW_RELATIONS';
	case 'users':
	return 'SELECT DISTINCT RDB$USER FROM RDB$USER_PRIVILEGES';
	default:
	return null;
	}
	}

	// }}}

	}

	/*
	* Local variables:
	* tab-width: 4
	* c-basic-offset: 4
	* End:
	*/

	?>

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