oci8.php
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	<?php

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

	/**
	* The PEAR DB driver for PHP's oci8 extension
	* for interacting with Oracle databases
	*
	* 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 James L. Pine <jlp@valinux.com>
	* @author Daniel Convissor <danielc@php.net>
	* @copyright 1997-2005 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 oci8 extension
	* for interacting with Oracle databases
	*
	* Definitely works with versions 8 and 9 of Oracle.
	*
	* These methods overload the ones declared in DB_common.
	*
	* Be aware... OCIError() only appears to return anything when given a
	* statement, so functions return the generic DB_ERROR instead of more
	* useful errors that have to do with feedback from the database.
	*
	* @category Database
	* @package DB
	* @author James L. Pine <jlp@valinux.com>
	* @author Daniel Convissor <danielc@php.net>
	* @copyright 1997-2005 The PHP Group
	* @license http://www.php.net/license/3_0.txt PHP License 3.0
	* @version Release: @package_version@
	* @link http://pear.php.net/package/DB
	*/
	class DB_oci8 extends DB_common
	{
	// {{{ properties

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

	/**
	* The database syntax variant to be used (db2, access, etc.), if any
	* @var string
	*/
	var $dbsyntax = 'oci8';

	/**
	* 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
	*
	* @var array
	*/
	var $features = array(
	'limit' => 'alter',
	'new_link' => '5.0.0',
	'numrows' => 'subquery',
	'pconnect' => true,
	'prepare' => true,
	'ssl' => false,
	'transactions' => true,
	);

	/**
	* A mapping of native error codes to DB error codes
	* @var array
	*/
	var $errorcode_map = array(
	1 => DB_ERROR_CONSTRAINT,
	900 => DB_ERROR_SYNTAX,
	904 => DB_ERROR_NOSUCHFIELD,
	913 => DB_ERROR_VALUE_COUNT_ON_ROW,
	921 => DB_ERROR_SYNTAX,
	923 => DB_ERROR_SYNTAX,
	942 => DB_ERROR_NOSUCHTABLE,
	955 => DB_ERROR_ALREADY_EXISTS,
	1400 => DB_ERROR_CONSTRAINT_NOT_NULL,
	1401 => DB_ERROR_INVALID,
	1407 => DB_ERROR_CONSTRAINT_NOT_NULL,
	1418 => DB_ERROR_NOT_FOUND,
	1476 => DB_ERROR_DIVZERO,
	1722 => DB_ERROR_INVALID_NUMBER,
	2289 => DB_ERROR_NOSUCHTABLE,
	2291 => DB_ERROR_CONSTRAINT,
	2292 => DB_ERROR_CONSTRAINT,
	2449 => DB_ERROR_CONSTRAINT,
	);

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

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


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

	/**
	* Stores the $data passed to execute() in the oci8 driver
	*
	* Gets reset to array() when simpleQuery() is run.
	*
	* Needed in case user wants to call numRows() after prepare/execute
	* was used.
	*
	* @var array
	* @access private
	*/
	var $_data = array();

	/**
	* The result or statement handle from the most recently executed query
	* @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_oci8()
	{
	$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.
	*
	* If PHP is at version 5.0.0 or greater:
	* + Generally, oci_connect() or oci_pconnect() are used.
	* + But if the new_link DSN option is set to true, oci_new_connect()
	* is used.
	*
	* When using PHP version 4.x, OCILogon() or OCIPLogon() are used.
	*
	* PEAR DB's oci8 driver supports the following extra DSN options:
	* + charset The character set to be used on the connection.
	* Only used if PHP is at version 5.0.0 or greater
	* and the Oracle server is at 9.2 or greater.
	* Available since PEAR DB 1.7.0.
	* + new_link If set to true, causes subsequent calls to
	* connect() to return a new connection link
	* instead of the existing one. WARNING: this is
	* not portable to other DBMS's.
	* Available since PEAR DB 1.7.0.
	*
	* @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('oci8')) {
	return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
	}

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

	if (function_exists('oci_connect')) {
	if (isset($dsn['new_link'])
	&& ($dsn['new_link'] == 'true' \|\| $dsn['new_link'] === true))
	{
	$connect_function = 'oci_new_connect';
	} else {
	$connect_function = $persistent ? 'oci_pconnect'
	: 'oci_connect';
	}

	// Backwards compatibility with DB < 1.7.0
	if (empty($dsn['database']) && !empty($dsn['hostspec'])) {
	$db = $dsn['hostspec'];
	} else {
	$db = $dsn['database'];
	}

	$char = empty($dsn['charset']) ? null : $dsn['charset'];
	$this->connection = @$connect_function($dsn['username'],
	$dsn['password'],
	$db,
	$char);
	$error = OCIError();
	if (!empty($error) && $error['code'] == 12541) {
	// Couldn't find TNS listener. Try direct connection.
	$this->connection = @$connect_function($dsn['username'],
	$dsn['password'],
	null,
	$char);
	}
	} else {
	$connect_function = $persistent ? 'OCIPLogon' : 'OCILogon';
	if ($dsn['hostspec']) {
	$this->connection = @$connect_function($dsn['username'],
	$dsn['password'],
	$dsn['hostspec']);
	} elseif ($dsn['username'] \|\| $dsn['password']) {
	$this->connection = @$connect_function($dsn['username'],
	$dsn['password']);
	}
	}

	if (!$this->connection) {
	$error = OCIError();
	$error = (is_array($error)) ? $error['message'] : null;
	return $this->raiseError(DB_ERROR_CONNECT_FAILED,
	null, null, null,
	$error);
	}
	return DB_OK;
	}

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

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

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

	/**
	* Sends a query to the database server
	*
	* To determine how many rows of a result set get buffered using
	* ocisetprefetch(), see the "result_buffering" option in setOptions().
	* This option was added in Release 1.7.0.
	*
	* @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)
	{
	$this->_data = array();
	$this->last_parameters = array();
	$this->last_query = $query;
	$query = $this->modifyQuery($query);
	$result = @OCIParse($this->connection, $query);
	if (!$result) {
	return $this->oci8RaiseError();
	}
	if ($this->autocommit) {
	$success = @OCIExecute($result,OCI_COMMIT_ON_SUCCESS);
	} else {
	$success = @OCIExecute($result,OCI_DEFAULT);
	}
	if (!$success) {
	return $this->oci8RaiseError($result);
	}
	$this->last_stmt = $result;
	if (DB::isManip($query)) {
	return DB_OK;
	} else {
	@ocisetprefetch($result, $this->options['result_buffering']);
	return $result;
	}
	}

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

	/**
	* Move the internal oracle result pointer to the next available result
	*
	* @param a valid oci8 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 $this->raiseError(DB_ERROR_NOT_CAPABLE);
	}
	if ($fetchmode & DB_FETCHMODE_ASSOC) {
	$moredata = @OCIFetchInto($result,$arr,OCI_ASSOC+OCI_RETURN_NULLS+OCI_RETURN_LOBS);
	if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE &&
	$moredata)
	{
	$arr = array_change_key_case($arr, CASE_LOWER);
	}
	} else {
	$moredata = OCIFetchInto($result,$arr,OCI_RETURN_NULLS+OCI_RETURN_LOBS);
	}
	if (!$moredata) {
	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 @OCIFreeStatement($result);
	}

	/**
	* Frees the internal resources associated with a prepared query
	*
	* @param resource $stmt the prepared statement's 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 $result is invalid
	*
	* @see DB_oci8::prepare()
	*/
	function freePrepared($stmt, $free_resource = true)
	{
	if (!is_resource($stmt)) {
	return false;
	}
	if ($free_resource) {
	@ocifreestatement($stmt);
	}
	if (isset($this->prepare_types[(int)$stmt])) {
	unset($this->prepare_types[(int)$stmt]);
	unset($this->manip_query[(int)$stmt]);
	} else {
	return false;
	}
	return true;
	}

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

	/**
	* Gets the number of rows in a result set
	*
	* Only works if the DB_PORTABILITY_NUMROWS portability option
	* is turned on.
	*
	* This method is not meant to be called directly. Use
	* DB_result::numRows() instead. It can't be declared "protected"
	* because DB_result is a separate object.
	*
	* @param resource $result PHP's query result resource
	*
	* @return int the number of rows. A DB_Error object on failure.
	*
	* @see DB_result::numRows(), DB_common::setOption()
	*/
	function numRows($result)
	{
	// emulate numRows for Oracle. yuck.
	if ($this->options['portability'] & DB_PORTABILITY_NUMROWS &&
	$result === $this->last_stmt)
	{
	$countquery = 'SELECT COUNT(*) FROM ('.$this->last_query.')';
	$save_query = $this->last_query;
	$save_stmt = $this->last_stmt;

	if (count($this->_data)) {
	$smt = $this->prepare('SELECT COUNT(*) FROM ('.$this->last_query.')');
	$count = $this->execute($smt, $this->_data);
	} else {
	$count =& $this->query($countquery);
	}

	if (DB::isError($count) \|\|
	DB::isError($row = $count->fetchRow(DB_FETCHMODE_ORDERED)))
	{
	$this->last_query = $save_query;
	$this->last_stmt = $save_stmt;
	return $this->raiseError(DB_ERROR_NOT_CAPABLE);
	}
	return $row[0];
	}
	return $this->raiseError(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)
	{
	$cols = @OCINumCols($result);
	if (!$cols) {
	return $this->oci8RaiseError($result);
	}
	return $cols;
	}

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

	/**
	* Prepares a query for multiple execution with execute().
	*
	* With oci8, this is emulated.
	*
	* 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 $query the query to be prepared
	*
	* @return mixed DB statement resource on success. DB_Error on failure.
	*
	* @see DB_oci8::execute()
	*/
	function prepare($query)
	{
	$tokens = preg_split('/((?<!\\\)[&?!])/', $query, -1,
	PREG_SPLIT_DELIM_CAPTURE);
	$binds = count($tokens) - 1;
	$token = 0;
	$types = array();
	$newquery = '';

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

	$this->last_query = $query;
	$newquery = $this->modifyQuery($newquery);
	if (!$stmt = @OCIParse($this->connection, $newquery)) {
	return $this->oci8RaiseError();
	}
	$this->prepare_types[(int)$stmt] = $types;
	$this->manip_query[(int)$stmt] = DB::isManip($query);
	return $stmt;
	}

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

	/**
	* Executes a DB statement prepared with prepare().
	*
	* To determine how many rows of a result set get buffered using
	* ocisetprefetch(), see the "result_buffering" option in setOptions().
	* This option was added in Release 1.7.0.
	*
	* @param resource $stmt a DB statement resource returned from prepare()
	* @param mixed $data array, string or numeric data to be used in
	* execution of the statement. Quantity of items
	* passed must match quantity of placeholders in
	* query: meaning 1 for non-array items or the
	* quantity of elements in the array.
	*
	* @return mixed returns an oic8 result resource for successful SELECT
	* queries, DB_OK for other successful queries.
	* A DB error object is returned on failure.
	*
	* @see DB_oci8::prepare()
	*/
	function &execute($stmt, $data = array())
	{
	$data = (array)$data;
	$this->last_parameters = $data;
	$this->_data = $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) {
	/*
	* Oracle 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
	* Oracle 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);
	}
	if (!@OCIBindByName($stmt, ':bind' . $i, $data[$key], -1)) {
	$tmp = $this->oci8RaiseError($stmt);
	return $tmp;
	}
	$i++;
	}
	if ($this->autocommit) {
	$success = @OCIExecute($stmt, OCI_COMMIT_ON_SUCCESS);
	} else {
	$success = @OCIExecute($stmt, OCI_DEFAULT);
	}
	if (!$success) {
	$tmp = $this->oci8RaiseError($stmt);
	return $tmp;
	}
	$this->last_stmt = $stmt;
	if ($this->manip_query[(int)$stmt]) {
	$tmp = DB_OK;
	} else {
	@ocisetprefetch($stmt, $this->options['result_buffering']);
	$tmp =& new DB_result($this, $stmt);
	}
	return $tmp;
	}

	// }}}
	// {{{ 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)
	{
	$this->autocommit = (bool)$onoff;;
	return DB_OK;
	}

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

	/**
	* Commits the current transaction
	*
	* @return int DB_OK on success. A DB_Error object on failure.
	*/
	function commit()
	{
	$result = @OCICommit($this->connection);
	if (!$result) {
	return $this->oci8RaiseError();
	}
	return DB_OK;
	}

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

	/**
	* Reverts the current transaction
	*
	* @return int DB_OK on success. A DB_Error object on failure.
	*/
	function rollback()
	{
	$result = @OCIRollback($this->connection);
	if (!$result) {
	return $this->oci8RaiseError();
	}
	return DB_OK;
	}

	// }}}
	// {{{ 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 ($this->last_stmt === false) {
	return $this->oci8RaiseError();
	}
	$result = @OCIRowCount($this->last_stmt);
	if ($result === false) {
	return $this->oci8RaiseError($this->last_stmt);
	}
	return $result;
	}

	// }}}
	// {{{ modifyQuery()

	/**
	* Changes a query string for various DBMS specific reasons
	*
	* "SELECT 2+2" must be "SELECT 2+2 FROM dual" in Oracle.
	*
	* @param string $query the query string to modify
	*
	* @return string the modified query string
	*
	* @access protected
	*/
	function modifyQuery($query)
	{
	if (preg_match('/^\s*SELECT/i', $query) &&
	!preg_match('/\sFROM\s/i', $query)) {
	$query .= ' FROM dual';
	}
	return $query;
	}

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

	/**
	* Adds LIMIT clauses to a query string according to current DBMS standards
	*
	* @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())
	{
	// Let Oracle return the name of the columns instead of
	// coding a "home" SQL parser

	if (count($params)) {
	$result = $this->prepare("SELECT * FROM ($query) "
	. 'WHERE NULL = NULL');
	$tmp =& $this->execute($result, $params);
	} else {
	$q_fields = "SELECT * FROM ($query) WHERE NULL = NULL";

	if (!$result = @OCIParse($this->connection, $q_fields)) {
	$this->last_query = $q_fields;
	return $this->oci8RaiseError();
	}
	if (!@OCIExecute($result, OCI_DEFAULT)) {
	$this->last_query = $q_fields;
	return $this->oci8RaiseError($result);
	}
	}

	$ncols = OCINumCols($result);
	$cols = array();
	for ( $i = 1; $i <= $ncols; $i++ ) {
	$cols[] = '"' . OCIColumnName($result, $i) . '"';
	}
	$fields = implode(', ', $cols);
	// XXX Test that (tip by John Lim)
	//if (preg_match('/^\s*SELECT\s+/is', $query, $match)) {
	// // Introduce the FIRST_ROWS Oracle query optimizer
	// $query = substr($query, strlen($match[0]), strlen($query));
	// $query = "SELECT /* +FIRST_ROWS */ " . $query;
	//}

	// Construct the query
	// more at: http://marc.theaimsgroup.com/?l=php-db&m=99831958101212&w=2
	// Perhaps this could be optimized with the use of Unions
	$query = "SELECT $fields FROM".
	" (SELECT rownum as linenum, $fields FROM".
	" ($query)".
	' WHERE rownum <= '. ($from + $count) .
	') WHERE linenum >= ' . ++$from;
	return $query;
	}

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

	/**
	* Returns the next free id in a sequence
	*
	* @param string $seq_name name of the sequence
	* @param boolean $ondemand when true, the seqence is automatically
	* created if it does not exist
	*
	* @return int the next id number in the sequence.
	* A DB_Error object on failure.
	*
	* @see DB_common::nextID(), DB_common::getSequenceName(),
	* DB_oci8::createSequence(), DB_oci8::dropSequence()
	*/
	function nextId($seq_name, $ondemand = true)
	{
	$seqname = $this->getSequenceName($seq_name);
	$repeat = 0;
	do {
	$this->expectError(DB_ERROR_NOSUCHTABLE);
	$result =& $this->query("SELECT ${seqname}.nextval FROM dual");
	$this->popExpect();
	if ($ondemand && DB::isError($result) &&
	$result->getCode() == DB_ERROR_NOSUCHTABLE) {
	$repeat = 1;
	$result = $this->createSequence($seq_name);
	if (DB::isError($result)) {
	return $this->raiseError($result);
	}
	} else {
	$repeat = 0;
	}
	} while ($repeat);
	if (DB::isError($result)) {
	return $this->raiseError($result);
	}
	$arr = $result->fetchRow(DB_FETCHMODE_ORDERED);
	return $arr[0];
	}

	/**
	* Creates a new sequence
	*
	* @param string $seq_name name of the new sequence
	*
	* @return int DB_OK on success. A DB_Error object on failure.
	*
	* @see DB_common::createSequence(), DB_common::getSequenceName(),
	* DB_oci8::nextID(), DB_oci8::dropSequence()
	*/
	function createSequence($seq_name)
	{
	return $this->query('CREATE SEQUENCE '
	. $this->getSequenceName($seq_name));
	}

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

	/**
	* Deletes a sequence
	*
	* @param string $seq_name name of the sequence to be deleted
	*
	* @return int DB_OK on success. A DB_Error object on failure.
	*
	* @see DB_common::dropSequence(), DB_common::getSequenceName(),
	* DB_oci8::nextID(), DB_oci8::createSequence()
	*/
	function dropSequence($seq_name)
	{
	return $this->query('DROP SEQUENCE '
	. $this->getSequenceName($seq_name));
	}

	// }}}
	// {{{ oci8RaiseError()

	/**
	* Produces a DB_Error object regarding the current problem
	*
	* @param int $errno if the error is being manually raised pass a
	* DB_ERROR* constant here. If this isn't passed
	* the error information gathered from the DBMS.
	*
	* @return object the DB_Error object
	*
	* @see DB_common::raiseError(),
	* DB_oci8::errorNative(), DB_oci8::errorCode()
	*/
	function oci8RaiseError($errno = null)
	{
	if ($errno === null) {
	$error = @OCIError($this->connection);
	return $this->raiseError($this->errorCode($error['code']),
	null, null, null, $error['message']);
	} elseif (is_resource($errno)) {
	$error = @OCIError($errno);
	return $this->raiseError($this->errorCode($error['code']),
	null, null, null, $error['message']);
	}
	return $this->raiseError($this->errorCode($errno));
	}

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

	/**
	* Gets the DBMS' native error code produced by the last query
	*
	* @return int the DBMS' error code. FALSE if the code could not be
	* determined
	*/
	function errorNative()
	{
	if (is_resource($this->last_stmt)) {
	$error = @OCIError($this->last_stmt);
	} else {
	$error = @OCIError($this->connection);
	}
	if (is_array($error)) {
	return $error['code'];
	}
	return false;
	}

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

	/**
	* Returns information about a table or a result set
	*
	* NOTE: only supports 'table' and 'flags' if <var>$result</var>
	* is a table name.
	*
	* NOTE: flags won't contain index information.
	*
	* @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, $mode = null)
	{
	if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
	$case_func = 'strtolower';
	} else {
	$case_func = 'strval';
	}

	$res = array();

	if (is_string($result)) {
	/*
	* Probably received a table name.
	* Create a result resource identifier.
	*/
	$result = strtoupper($result);
	$q_fields = 'SELECT column_name, data_type, data_length, '
	. 'nullable '
	. 'FROM user_tab_columns '
	. "WHERE table_name='$result' ORDER BY column_id";

	$this->last_query = $q_fields;

	if (!$stmt = @OCIParse($this->connection, $q_fields)) {
	return $this->oci8RaiseError(DB_ERROR_NEED_MORE_DATA);
	}
	if (!@OCIExecute($stmt, OCI_DEFAULT)) {
	return $this->oci8RaiseError($stmt);
	}

	$i = 0;
	while (@OCIFetch($stmt)) {
	$res[$i] = array(
	'table' => $case_func($result),
	'name' => $case_func(@OCIResult($stmt, 1)),
	'type' => @OCIResult($stmt, 2),
	'len' => @OCIResult($stmt, 3),
	'flags' => (@OCIResult($stmt, 4) == 'N') ? 'not_null' : '',
	);
	if ($mode & DB_TABLEINFO_ORDER) {
	$res['order'][$res[$i]['name']] = $i;
	}
	if ($mode & DB_TABLEINFO_ORDERTABLE) {
	$res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
	}
	$i++;
	}

	if ($mode) {
	$res['num_fields'] = $i;
	}
	@OCIFreeStatement($stmt);

	} else {
	if (isset($result->result)) {
	/*
	* Probably received a result object.
	* Extract the result resource identifier.
	*/
	$result = $result->result;
	}

	$res = array();

	if ($result === $this->last_stmt) {
	$count = @OCINumCols($result);
	if ($mode) {
	$res['num_fields'] = $count;
	}
	for ($i = 0; $i < $count; $i++) {
	$res[$i] = array(
	'table' => '',
	'name' => $case_func(@OCIColumnName($result, $i+1)),
	'type' => @OCIColumnType($result, $i+1),
	'len' => @OCIColumnSize($result, $i+1),
	'flags' => '',
	);
	if ($mode & DB_TABLEINFO_ORDER) {
	$res['order'][$res[$i]['name']] = $i;
	}
	if ($mode & DB_TABLEINFO_ORDERTABLE) {
	$res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
	}
	}
	} else {
	return $this->raiseError(DB_ERROR_NOT_CAPABLE);
	}
	}
	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 table_name FROM user_tables';
	case 'synonyms':
	return 'SELECT synonym_name FROM user_synonyms';
	default:
	return null;
	}
	}

	// }}}

	}

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

	?>

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