sqlite.php
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	<?php
	// vim: set et ts=4 sw=4 fdm=marker:
	// +----------------------------------------------------------------------+
	// \| PHP versions 4 and 5 \|
	// +----------------------------------------------------------------------+
	// \| Copyright (c) 1998-2008 Manuel Lemos, Tomas V.V.Cox, \|
	// \| Stig. S. Bakken, Lukas Smith \|
	// \| 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: sqlite.php 295587 2010-02-28 17:16:38Z quipo $
	//

	/**
	* MDB2 SQLite driver
	*
	* @package MDB2
	* @category Database
	* @author Lukas Smith <smith@pooteeweet.org>
	*/
	class MDB2_Driver_sqlite extends MDB2_Driver_Common
	{
	// {{{ properties
	var $string_quoting = array('start' => "'", 'end' => "'", 'escape' => "'", 'escape_pattern' => false);

	var $identifier_quoting = array('start' => '"', 'end' => '"', 'escape' => '"');

	var $_lasterror = '';

	var $fix_assoc_fields_names = false;

	// }}}
	// {{{ constructor

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

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

	$this->supported['sequences'] = 'emulated';
	$this->supported['indexes'] = true;
	$this->supported['affected_rows'] = true;
	$this->supported['summary_functions'] = true;
	$this->supported['order_by_text'] = true;
	$this->supported['current_id'] = 'emulated';
	$this->supported['limit_queries'] = true;
	$this->supported['LOBs'] = true;
	$this->supported['replace'] = true;
	$this->supported['transactions'] = true;
	$this->supported['savepoints'] = false;
	$this->supported['sub_selects'] = true;
	$this->supported['triggers'] = true;
	$this->supported['auto_increment'] = true;
	$this->supported['primary_key'] = false; // requires alter table implementation
	$this->supported['result_introspection'] = false; // not implemented
	$this->supported['prepared_statements'] = 'emulated';
	$this->supported['identifier_quoting'] = true;
	$this->supported['pattern_escaping'] = false;
	$this->supported['new_link'] = false;

	$this->options['DBA_username'] = false;
	$this->options['DBA_password'] = false;
	$this->options['base_transaction_name'] = '___php_MDB2_sqlite_auto_commit_off';
	$this->options['fixed_float'] = 0;
	$this->options['database_path'] = '';
	$this->options['database_extension'] = '';
	$this->options['server_version'] = '';
	$this->options['max_identifiers_length'] = 128; //no real limit
	}

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

	/**
	* This method is used to collect information about an error
	*
	* @param integer $error
	* @return array
	* @access public
	*/
	function errorInfo($error = null)
	{
	$native_code = null;
	if ($this->connection) {
	$native_code = @sqlite_last_error($this->connection);
	}
	$native_msg = $this->_lasterror
	? html_entity_decode($this->_lasterror) : @sqlite_error_string($native_code);

	// PHP 5.2+ prepends the function name to $php_errormsg, so we need
	// this hack to work around it, per bug #9599.
	$native_msg = preg_replace('/^sqlite[a-z_]+[^:]*: /', '', $native_msg);

	if (null === $error) {
	static $error_regexps;
	if (empty($error_regexps)) {
	$error_regexps = array(
	'/^no such table:/' => MDB2_ERROR_NOSUCHTABLE,
	'/^no such index:/' => MDB2_ERROR_NOT_FOUND,
	'/^(table\|index) .* already exists$/' => MDB2_ERROR_ALREADY_EXISTS,
	'/PRIMARY KEY must be unique/i' => MDB2_ERROR_CONSTRAINT,
	'/is not unique/' => MDB2_ERROR_CONSTRAINT,
	'/columns .* are not unique/i' => MDB2_ERROR_CONSTRAINT,
	'/uniqueness constraint failed/' => MDB2_ERROR_CONSTRAINT,
	'/may not be NULL/' => MDB2_ERROR_CONSTRAINT_NOT_NULL,
	'/^no such column:/' => MDB2_ERROR_NOSUCHFIELD,
	'/no column named/' => MDB2_ERROR_NOSUCHFIELD,
	'/column not present in both tables/i' => MDB2_ERROR_NOSUCHFIELD,
	'/^near ".*": syntax error$/' => MDB2_ERROR_SYNTAX,
	'/[0-9]+ values for [0-9]+ columns/i' => MDB2_ERROR_VALUE_COUNT_ON_ROW,
	);
	}
	foreach ($error_regexps as $regexp => $code) {
	if (preg_match($regexp, $native_msg)) {
	$error = $code;
	break;
	}
	}
	}
	return array($error, $native_code, $native_msg);
	}

	// }}}
	// {{{ escape()

	/**
	* Quotes a string so it can be safely used in a query. It will quote
	* the text so it can safely be used within a query.
	*
	* @param string the input string to quote
	* @param bool escape wildcards
	*
	* @return string quoted string
	*
	* @access public
	*/
	function escape($text, $escape_wildcards = false)
	{
	$text = @sqlite_escape_string($text);
	return $text;
	}

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

	/**
	* Start a transaction or set a savepoint.
	*
	* @param string name of a savepoint to set
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	*
	* @access public
	*/
	function beginTransaction($savepoint = null)
	{
	$this->debug('Starting transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
	if (null !== $savepoint) {
	return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
	'savepoints are not supported', __FUNCTION__);
	}
	if ($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');
	}
	$query = 'BEGIN TRANSACTION '.$this->options['base_transaction_name'];
	$result = $this->_doQuery($query, 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 or release a savepoint. This function may only be called when
	* auto-committing is disabled, otherwise it will fail. Therefore, a new
	* transaction is implicitly started after committing the pending changes.
	*
	* @param string name of a savepoint to release
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	*
	* @access public
	*/
	function commit($savepoint = null)
	{
	$this->debug('Committing transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
	if (!$this->in_transaction) {
	return $this->raiseError(MDB2_ERROR_INVALID, null, null,
	'commit/release savepoint cannot be done changes are auto committed', __FUNCTION__);
	}
	if (null !== $savepoint) {
	return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
	'savepoints are not supported', __FUNCTION__);
	}

	$query = 'COMMIT TRANSACTION '.$this->options['base_transaction_name'];
	$result = $this->_doQuery($query, true);
	if (PEAR::isError($result)) {
	return $result;
	}
	$this->in_transaction = false;
	return MDB2_OK;
	}

	// }}}
	// {{{

	/**
	* Cancel any database changes done during a transaction or since a specific
	* savepoint that is in progress. This function may only be called when
	* auto-committing is disabled, otherwise it will fail. Therefore, a new
	* transaction is implicitly started after canceling the pending changes.
	*
	* @param string name of a savepoint to rollback to
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	*
	* @access public
	*/
	function rollback($savepoint = null)
	{
	$this->debug('Rolling back transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
	if (!$this->in_transaction) {
	return $this->raiseError(MDB2_ERROR_INVALID, null, null,
	'rollback cannot be done changes are auto committed', __FUNCTION__);
	}
	if (null !== $savepoint) {
	return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
	'savepoints are not supported', __FUNCTION__);
	}

	$query = 'ROLLBACK TRANSACTION '.$this->options['base_transaction_name'];
	$result = $this->_doQuery($query, true);
	if (PEAR::isError($result)) {
	return $result;
	}
	$this->in_transaction = false;
	return MDB2_OK;
	}

	// }}}
	// {{{ function setTransactionIsolation()

	/**
	* Set the transacton isolation level.
	*
	* @param string standard isolation level
	* READ UNCOMMITTED (allows dirty reads)
	* READ COMMITTED (prevents dirty reads)
	* REPEATABLE READ (prevents nonrepeatable reads)
	* SERIALIZABLE (prevents phantom reads)
	* @param array some transaction options:
	* 'wait' => 'WAIT' \| 'NO WAIT'
	* 'rw' => 'READ WRITE' \| 'READ ONLY'
	*
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	*
	* @access public
	* @since 2.1.1
	*/
	function setTransactionIsolation($isolation, $options = array())
	{
	$this->debug('Setting transaction isolation level', __FUNCTION__, array('is_manip' => true));
	switch ($isolation) {
	case 'READ UNCOMMITTED':
	$isolation = 0;
	break;
	case 'READ COMMITTED':
	case 'REPEATABLE READ':
	case 'SERIALIZABLE':
	$isolation = 1;
	break;
	default:
	return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
	'isolation level is not supported: '.$isolation, __FUNCTION__);
	}

	$query = "PRAGMA read_uncommitted=$isolation";
	return $this->_doQuery($query, true);
	}

	// }}}
	// {{{ getDatabaseFile()

	/**
	* Builds the string with path+dbname+extension
	*
	* @return string full database path+file
	* @access protected
	*/
	function _getDatabaseFile($database_name)
	{
	if ($database_name === '' \|\| $database_name === ':memory:') {
	return $database_name;
	}
	return $this->options['database_path'].$database_name.$this->options['database_extension'];
	}

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

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

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

	if (empty($this->database_name)) {
	return $this->raiseError(MDB2_ERROR_CONNECT_FAILED, null, null,
	'unable to establish a connection', __FUNCTION__);
	}

	if ($database_file !== ':memory:') {
	if (!file_exists($database_file)) {
	if (!touch($database_file)) {
	return $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
	'Could not create database file', __FUNCTION__);
	}
	if (!isset($this->dsn['mode'])
	\|\| !is_numeric($this->dsn['mode'])
	) {
	$mode = 0644;
	} else {
	$mode = octdec($this->dsn['mode']);
	}
	if (!chmod($database_file, $mode)) {
	return $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
	'Could not be chmodded database file', __FUNCTION__);
	}
	if (!file_exists($database_file)) {
	return $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
	'Could not be found database file', __FUNCTION__);
	}
	}
	if (!is_file($database_file)) {
	return $this->raiseError(MDB2_ERROR_INVALID, null, null,
	'Database is a directory name', __FUNCTION__);
	}
	if (!is_readable($database_file)) {
	return $this->raiseError(MDB2_ERROR_ACCESS_VIOLATION, null, null,
	'Could not read database file', __FUNCTION__);
	}
	}

	$connect_function = ($this->options['persistent'] ? 'sqlite_popen' : 'sqlite_open');
	$php_errormsg = '';
	if (version_compare('5.1.0', PHP_VERSION, '>')) {
	@ini_set('track_errors', true);
	$connection = @$connect_function($database_file);
	@ini_restore('track_errors');
	} else {
	$connection = @$connect_function($database_file, 0666, $php_errormsg);
	}
	$this->_lasterror = $php_errormsg;
	if (!$connection) {
	return $this->raiseError(MDB2_ERROR_CONNECT_FAILED, null, null,
	'unable to establish a connection', __FUNCTION__);
	}

	if ($this->fix_assoc_fields_names \|\|
	$this->options['portability'] & MDB2_PORTABILITY_FIX_ASSOC_FIELD_NAMES)
	{
	@sqlite_query("PRAGMA short_column_names = 1", $connection);
	$this->fix_assoc_fields_names = true;
	}

	$this->connection = $connection;
	$this->connected_dsn = $this->dsn;
	$this->connected_database_name = $database_file;
	$this->opened_persistent = $this->getoption('persistent');
	$this->dbsyntax = $this->dsn['dbsyntax'] ? $this->dsn['dbsyntax'] : $this->phptype;

	return MDB2_OK;
	}

	// }}}
	// {{{ databaseExists()

	/**
	* check if given database name is exists?
	*
	* @param string $name name of the database that should be checked
	*
	* @return mixed true/false on success, a MDB2 error on failure
	* @access public
	*/
	function databaseExists($name)
	{
	$database_file = $this->_getDatabaseFile($name);
	$result = file_exists($database_file);
	return $result;
	}

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

	/**
	* Log out and disconnect from the database.
	*
	* @param boolean $force if the disconnect should be forced even if the
	* connection is opened persistently
	* @return mixed true on success, false if not connected and error
	* object on error
	* @access public
	*/
	function disconnect($force = true)
	{
	if (is_resource($this->connection)) {
	if ($this->in_transaction) {
	$dsn = $this->dsn;
	$database_name = $this->database_name;
	$persistent = $this->options['persistent'];
	$this->dsn = $this->connected_dsn;
	$this->database_name = $this->connected_database_name;
	$this->options['persistent'] = $this->opened_persistent;
	$this->rollback();
	$this->dsn = $dsn;
	$this->database_name = $database_name;
	$this->options['persistent'] = $persistent;
	}

	if (!$this->opened_persistent \|\| $force) {
	@sqlite_close($this->connection);
	}
	} else {
	return false;
	}
	return parent::disconnect($force);
	}

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

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

	if (null === $connection) {
	$connection = $this->getConnection();
	if (PEAR::isError($connection)) {
	return $connection;
	}
	}

	$function = $this->options['result_buffering']
	? 'sqlite_query' : 'sqlite_unbuffered_query';
	$php_errormsg = '';
	if (version_compare('5.1.0', PHP_VERSION, '>')) {
	@ini_set('track_errors', true);
	do {
	$result = @$function($query.';', $connection);
	} while (sqlite_last_error($connection) == SQLITE_SCHEMA);
	@ini_restore('track_errors');
	} else {
	do {
	$result = @$function($query.';', $connection, SQLITE_BOTH, $php_errormsg);
	} while (sqlite_last_error($connection) == SQLITE_SCHEMA);
	}
	$this->_lasterror = $php_errormsg;

	if (!$result) {
	$code = null;
	if (0 === strpos($this->_lasterror, 'no such table')) {
	$code = MDB2_ERROR_NOSUCHTABLE;
	}
	$err = $this->raiseError($code, null, null,
	'Could not execute statement', __FUNCTION__);
	return $err;
	}

	$this->debug($query, 'query', array('is_manip' => $is_manip, 'when' => 'post', 'result' => $result));
	return $result;
	}

	// }}}
	// {{{ _affectedRows()

	/**
	* Returns the number of rows affected
	*
	* @param resource $result
	* @param resource $connection
	* @return mixed MDB2 Error Object or the number of rows affected
	* @access private
	*/
	function _affectedRows($connection, $result = null)
	{
	if (null === $connection) {
	$connection = $this->getConnection();
	if (PEAR::isError($connection)) {
	return $connection;
	}
	}
	return @sqlite_changes($connection);
	}

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

	/**
	* Changes a query string for various DBMS specific reasons
	*
	* @param string $query query to modify
	* @param boolean $is_manip if it is a DML query
	* @param integer $limit limit the number of rows
	* @param integer $offset start reading from given offset
	* @return string modified query
	* @access protected
	*/
	function _modifyQuery($query, $is_manip, $limit, $offset)
	{
	if ($this->options['portability'] & MDB2_PORTABILITY_DELETE_COUNT) {
	if (preg_match('/^\sDELETE\s+FROM\s+(\S+)\s$/i', $query)) {
	$query = preg_replace('/^\sDELETE\s+FROM\s+(\S+)\s$/',
	'DELETE FROM \1 WHERE 1=1', $query);
	}
	}
	if ($limit > 0
	&& !preg_match('/LIMIT\s\d(?:\s(?:,\|OFFSET)\s\d+)?(?:[^\)])?$/i', $query)
	) {
	$query = rtrim($query);
	if (substr($query, -1) == ';') {
	$query = substr($query, 0, -1);
	}
	if ($is_manip) {
	$query.= " LIMIT $limit";
	} else {
	$query.= " LIMIT $offset,$limit";
	}
	}
	return $query;
	}

	// }}}
	// {{{ getServerVersion()

	/**
	* return version information about the server
	*
	* @param bool $native determines if the raw version string should be returned
	* @return mixed array/string with version information or MDB2 error object
	* @access public
	*/
	function getServerVersion($native = false)
	{
	$server_info = false;
	if ($this->connected_server_info) {
	$server_info = $this->connected_server_info;
	} elseif ($this->options['server_version']) {
	$server_info = $this->options['server_version'];
	} elseif (function_exists('sqlite_libversion')) {
	$server_info = @sqlite_libversion();
	}
	if (!$server_info) {
	return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
	'Requires either the "server_version" option or the sqlite_libversion() function', __FUNCTION__);
	}
	// cache server_info
	$this->connected_server_info = $server_info;
	if (!$native) {
	$tmp = explode('.', $server_info, 3);
	$server_info = array(
	'major' => isset($tmp[0]) ? $tmp[0] : null,
	'minor' => isset($tmp[1]) ? $tmp[1] : null,
	'patch' => isset($tmp[2]) ? $tmp[2] : null,
	'extra' => null,
	'native' => $server_info,
	);
	}
	return $server_info;
	}

	// }}}
	// {{{ replace()

	/**
	* Execute a SQL REPLACE query. A REPLACE query is identical to a INSERT
	* query, except that if there is already a row in the table with the same
	* key field values, the old row is deleted before the new row is inserted.
	*
	* The REPLACE type of query does not make part of the SQL standards. Since
	* practically only SQLite implements it natively, this type of query is
	* emulated through this method for other DBMS using standard types of
	* queries inside a transaction to assure the atomicity of the operation.
	*
	* @access public
	*
	* @param string $table name of the table on which the REPLACE query will
	* be executed.
	* @param array $fields associative array that describes the fields and the
	* values that will be inserted or updated in the specified table. The
	* indexes of the array are the names of all the fields of the table. The
	* values of the array are also associative arrays that describe the
	* values and other properties of the table fields.
	*
	* Here follows a list of field properties that need to be specified:
	*
	* value:
	* Value to be assigned to the specified field. This value may be
	* of specified in database independent type format as this
	* function can perform the necessary datatype conversions.
	*
	* Default:
	* this property is required unless the Null property
	* is set to 1.
	*
	* type
	* Name of the type of the field. Currently, all types Metabase
	* are supported except for clob and blob.
	*
	* Default: no type conversion
	*
	* null
	* Boolean property that indicates that the value for this field
	* should be set to null.
	*
	* The default value for fields missing in INSERT queries may be
	* specified the definition of a table. Often, the default value
	* is already null, but since the REPLACE may be emulated using
	* an UPDATE query, make sure that all fields of the table are
	* listed in this function argument array.
	*
	* Default: 0
	*
	* key
	* Boolean property that indicates that this field should be
	* handled as a primary key or at least as part of the compound
	* unique index of the table that will determine the row that will
	* updated if it exists or inserted a new row otherwise.
	*
	* This function will fail if no key field is specified or if the
	* value of a key field is set to null because fields that are
	* part of unique index they may not be null.
	*
	* Default: 0
	*
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	*/
	function replace($table, $fields)
	{
	$count = count($fields);
	$query = $values = '';
	$keys = $colnum = 0;
	for (reset($fields); $colnum < $count; next($fields), $colnum++) {
	$name = key($fields);
	if ($colnum > 0) {
	$query .= ',';
	$values.= ',';
	}
	$query.= $this->quoteIdentifier($name, true);
	if (isset($fields[$name]['null']) && $fields[$name]['null']) {
	$value = 'NULL';
	} else {
	$type = isset($fields[$name]['type']) ? $fields[$name]['type'] : null;
	$value = $this->quote($fields[$name]['value'], $type);
	if (PEAR::isError($value)) {
	return $value;
	}
	}
	$values.= $value;
	if (isset($fields[$name]['key']) && $fields[$name]['key']) {
	if ($value === 'NULL') {
	return $this->raiseError(MDB2_ERROR_CANNOT_REPLACE, null, null,
	'key value '.$name.' may not be NULL', __FUNCTION__);
	}
	$keys++;
	}
	}
	if ($keys == 0) {
	return $this->raiseError(MDB2_ERROR_CANNOT_REPLACE, null, null,
	'not specified which fields are keys', __FUNCTION__);
	}

	$connection = $this->getConnection();
	if (PEAR::isError($connection)) {
	return $connection;
	}

	$table = $this->quoteIdentifier($table, true);
	$query = "REPLACE INTO $table ($query) VALUES ($values)";
	$result = $this->_doQuery($query, true, $connection);
	if (PEAR::isError($result)) {
	return $result;
	}
	return $this->_affectedRows($connection, $result);
	}

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

	/**
	* Returns the next free id of a sequence
	*
	* @param string $seq_name name of the sequence
	* @param boolean $ondemand when true the sequence is
	* automatic created, if it
	* not exists
	*
	* @return mixed MDB2 Error Object or id
	* @access public
	*/
	function nextID($seq_name, $ondemand = true)
	{
	$sequence_name = $this->quoteIdentifier($this->getSequenceName($seq_name), true);
	$seqcol_name = $this->options['seqcol_name'];
	$query = "INSERT INTO $sequence_name ($seqcol_name) VALUES (NULL)";
	$this->pushErrorHandling(PEAR_ERROR_RETURN);
	$this->expectError(MDB2_ERROR_NOSUCHTABLE);
	$result = $this->_doQuery($query, true);
	$this->popExpect();
	$this->popErrorHandling();
	if (PEAR::isError($result)) {
	if ($ondemand && $result->getCode() == MDB2_ERROR_NOSUCHTABLE) {
	$this->loadModule('Manager', null, true);
	$result = $this->manager->createSequence($seq_name);
	if (PEAR::isError($result)) {
	return $this->raiseError($result, null, null,
	'on demand sequence '.$seq_name.' could not be created', __FUNCTION__);
	} else {
	return $this->nextID($seq_name, false);
	}
	}
	return $result;
	}
	$value = $this->lastInsertID();
	if (is_numeric($value)) {
	$query = "DELETE FROM $sequence_name WHERE $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 or fetches the current
	* ID in a sequence called: $table.(empty($field) ? '' : '_'.$field)
	*
	* @param string $table name of the table into which a new row was inserted
	* @param string $field name of the field into which a new row was inserted
	* @return mixed MDB2 Error Object or id
	* @access public
	*/
	function lastInsertID($table = null, $field = null)
	{
	$connection = $this->getConnection();
	if (PEAR::isError($connection)) {
	return $connection;
	}
	$value = @sqlite_last_insert_rowid($connection);
	if (!$value) {
	return $this->raiseError(null, null, null,
	'Could not get last insert ID', __FUNCTION__);
	}
	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 = $this->quoteIdentifier($this->getSequenceName($seq_name), true);
	$seqcol_name = $this->quoteIdentifier($this->options['seqcol_name'], true);
	$query = "SELECT MAX($seqcol_name) FROM $sequence_name";
	return $this->queryOne($query, 'integer');
	}
	}

	/**
	* MDB2 SQLite result driver
	*
	* @package MDB2
	* @category Database
	* @author Lukas Smith <smith@pooteeweet.org>
	*/
	class MDB2_Result_sqlite 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 (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) {
	$row = @sqlite_fetch_array($this->result, SQLITE_ASSOC);
	if (is_array($row)
	&& $this->db->options['portability'] & MDB2_PORTABILITY_FIX_CASE
	) {
	$row = array_change_key_case($row, $this->db->options['field_case']);
	}
	} else {
	$row = @sqlite_fetch_array($this->result, SQLITE_NUM);
	}
	if (!$row) {
	if (false === $this->result) {
	$err = $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'resultset has already been freed', __FUNCTION__);
	return $err;
	}
	return null;
	}
	$mode = $this->db->options['portability'] & MDB2_PORTABILITY_EMPTY_TO_NULL;
	$rtrim = false;
	if ($this->db->options['portability'] & MDB2_PORTABILITY_RTRIM) {
	if (empty($this->types)) {
	$mode += MDB2_PORTABILITY_RTRIM;
	} else {
	$rtrim = true;
	}
	}
	if ($mode) {
	$this->db->_fixResultArrayValues($row, $mode);
	}
	if (!empty($this->types)) {
	$row = $this->db->datatype->convertResultRow($this->types, $row, $rtrim);
	}
	if (!empty($this->values)) {
	$this->_assignBindColumns($row);
	}
	if ($fetchmode === MDB2_FETCHMODE_OBJECT) {
	$object_class = $this->db->options['fetch_class'];
	if ($object_class == 'stdClass') {
	$row = (object) $row;
	} else {
	$rowObj = new $object_class($row);
	$row = $rowObj;
	}
	}
	++$this->rownum;
	return $row;
	}

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

	/**
	* Retrieve the names of columns returned by the DBMS in a query result.
	*
	* @return mixed Array variable that holds the names of columns as keys
	* or an MDB2 error on failure.
	* Some DBMS may not return any columns when the result set
	* does not contain any rows.
	* @access private
	*/
	function _getColumnNames()
	{
	$columns = array();
	$numcols = $this->numCols();
	if (PEAR::isError($numcols)) {
	return $numcols;
	}
	for ($column = 0; $column < $numcols; $column++) {
	$column_name = @sqlite_field_name($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.
	*
	* @access public
	* @return mixed integer value with the number of columns, a MDB2 error
	* on failure
	*/
	function numCols()
	{
	$cols = @sqlite_num_fields($this->result);
	if (null === $cols) {
	if (false === $this->result) {
	return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'resultset has already been freed', __FUNCTION__);
	}
	if (null === $this->result) {
	return count($this->types);
	}
	return $this->db->raiseError(null, null, null,
	'Could not get column count', __FUNCTION__);
	}
	return $cols;
	}
	}

	/**
	* MDB2 SQLite buffered result driver
	*
	* @package MDB2
	* @category Database
	* @author Lukas Smith <smith@pooteeweet.org>
	*/
	class MDB2_BufferedResult_sqlite extends MDB2_Result_sqlite
	{
	// {{{ 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 (!@sqlite_seek($this->result, $rownum)) {
	if (false === $this->result) {
	return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'resultset has already been freed', __FUNCTION__);
	}
	if (null === $this->result) {
	return MDB2_OK;
	}
	return $this->db->raiseError(MDB2_ERROR_INVALID, null, null,
	'tried to seek to an invalid row number ('.$rownum.')', __FUNCTION__);
	}
	$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()
	{
	$rows = @sqlite_num_rows($this->result);
	if (null === $rows) {
	if (false === $this->result) {
	return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'resultset has already been freed', __FUNCTION__);
	}
	if (null === $this->result) {
	return 0;
	}
	return $this->db->raiseError(null, null, null,
	'Could not get row count', __FUNCTION__);
	}
	return $rows;
	}
	}

	/**
	* MDB2 SQLite statement driver
	*
	* @package MDB2
	* @category Database
	* @author Lukas Smith <smith@pooteeweet.org>
	*/
	class MDB2_Statement_sqlite extends MDB2_Statement_Common
	{

	}
	?>

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