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[DATABASE] Switch from PEAR DB to MDB2
2020-09-14 20:46:29 +01:00
<?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, 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: Frank M. Kromann <frank@kromann.info> |
// +----------------------------------------------------------------------+
//
// $Id$
//
// {{{ Class MDB2_Driver_mssql
/**
* MDB2 MSSQL Server driver
*
* @package MDB2
* @category Database
* @author Frank M. Kromann <frank@kromann.info>
*/
class MDB2_Driver_mssql extends MDB2_Driver_Common
{
// {{{ properties
var $string_quoting = array('start' => "'", 'end' => "'", 'escape' => "'", 'escape_pattern' => false);
var $identifier_quoting = array('start' => '[', 'end' => ']', 'escape' => ']');
// }}}
// {{{ constructor
/**
* Constructor
*/
function __construct()
{
parent::__construct();
$this->phptype = 'mssql';
$this->dbsyntax = 'mssql';
$this->supported['sequences'] = 'emulated';
$this->supported['indexes'] = true;
$this->supported['affected_rows'] = true;
$this->supported['transactions'] = true;
$this->supported['savepoints'] = false;
$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['triggers'] = true;
$this->supported['auto_increment'] = true;
$this->supported['primary_key'] = true;
$this->supported['result_introspection'] = true;
$this->supported['prepared_statements'] = 'emulated';
$this->supported['pattern_escaping'] = true;
$this->supported['new_link'] = true;
$this->options['DBA_username'] = false;
$this->options['DBA_password'] = false;
$this->options['database_device'] = false;
$this->options['database_size'] = false;
$this->options['max_identifiers_length'] = 128; // MS Access: 64
}
// }}}
// {{{ errorInfo()
/**
* This method is used to collect information about an error
*
* @param integer $error
* @return array
* @access public
*/
function errorInfo($error = null, $connection = null)
{
if (null === $connection) {
$connection = $this->connection;
}
$native_code = null;
if ($connection) {
$result = @mssql_query('select @@ERROR as ErrorCode', $connection);
if ($result) {
$native_code = @mssql_result($result, 0, 0);
@mssql_free_result($result);
}
}
$native_msg = @mssql_get_last_message();
if (null === $error) {
static $ecode_map;
if (empty($ecode_map)) {
$ecode_map = array(
102 => MDB2_ERROR_SYNTAX,
110 => MDB2_ERROR_VALUE_COUNT_ON_ROW,
155 => MDB2_ERROR_NOSUCHFIELD,
156 => MDB2_ERROR_SYNTAX,
170 => MDB2_ERROR_SYNTAX,
207 => MDB2_ERROR_NOSUCHFIELD,
208 => MDB2_ERROR_NOSUCHTABLE,
245 => MDB2_ERROR_INVALID_NUMBER,
319 => MDB2_ERROR_SYNTAX,
321 => MDB2_ERROR_NOSUCHFIELD,
325 => MDB2_ERROR_SYNTAX,
336 => MDB2_ERROR_SYNTAX,
515 => MDB2_ERROR_CONSTRAINT_NOT_NULL,
547 => MDB2_ERROR_CONSTRAINT,
911 => MDB2_ERROR_NOT_FOUND,
1018 => MDB2_ERROR_SYNTAX,
1035 => MDB2_ERROR_SYNTAX,
1801 => MDB2_ERROR_ALREADY_EXISTS,
1913 => MDB2_ERROR_ALREADY_EXISTS,
2209 => MDB2_ERROR_SYNTAX,
2223 => MDB2_ERROR_SYNTAX,
2248 => MDB2_ERROR_SYNTAX,
2256 => MDB2_ERROR_SYNTAX,
2257 => MDB2_ERROR_SYNTAX,
2627 => MDB2_ERROR_CONSTRAINT,
2714 => MDB2_ERROR_ALREADY_EXISTS,
3607 => MDB2_ERROR_DIVZERO,
3701 => MDB2_ERROR_NOSUCHTABLE,
7630 => MDB2_ERROR_SYNTAX,
8134 => MDB2_ERROR_DIVZERO,
9303 => MDB2_ERROR_SYNTAX,
9317 => MDB2_ERROR_SYNTAX,
9318 => MDB2_ERROR_SYNTAX,
9331 => MDB2_ERROR_SYNTAX,
9332 => MDB2_ERROR_SYNTAX,
15253 => MDB2_ERROR_SYNTAX,
);
}
if (isset($ecode_map[$native_code])) {
if ($native_code == 3701
&& preg_match('/Cannot drop the index/i', $native_msg)
) {
$error = MDB2_ERROR_NOT_FOUND;
} else {
$error = $ecode_map[$native_code];
}
}
}
return array($error, $native_code, $native_msg);
}
// }}}
// {{{ function escapePattern($text)
/**
* Quotes pattern (% and _) characters in a string)
*
* @param string the input string to quote
*
* @return string quoted string
*
* @access public
*/
function escapePattern($text)
{
$text = str_replace("[", "[ [ ]", $text);
foreach ($this->wildcards as $wildcard) {
$text = str_replace($wildcard, '[' . $wildcard . ']', $text);
}
return $text;
}
// }}}
// {{{ 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 $text the input string to quote
* @param bool $escape_wildcards flag
*
* @return string quoted string
* @access public
*/
function escape($text, $escape_wildcards = false)
{
$text = parent::escape($text, $escape_wildcards);
// http://pear.php.net/bugs/bug.php?id=16118
// http://support.microsoft.com/kb/164291
return preg_replace("/\\\\(\r\n|\r|\n)/", '\\\\$1', $text);
}
// }}}
// {{{ beginTransaction()
/**
* Start a transaction or set a savepoint.
*
* @param string $savepoint name of a savepoint to set
*
* @return mixed MDB2_OK on success, a MDB2 error on failure
* @access public
*/
function beginTransaction($savepoint = null)
{
$this->debug('Starting transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
if (null !== $savepoint) {
if (!$this->in_transaction) {
return $this->raiseError(MDB2_ERROR_INVALID, null, null,
'savepoint cannot be released when changes are auto committed', __FUNCTION__);
}
$query = 'SAVE TRANSACTION '.$savepoint;
return $this->_doQuery($query, true);
}
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 =& $this->_doQuery('BEGIN TRANSACTION', true);
if (MDB2::isError($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 $savepoint name of a savepoint to release
*
* @return mixed MDB2_OK on success, a MDB2 error on failure
* @access public
*/
function commit($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 MDB2_OK;
}
$result =& $this->_doQuery('COMMIT TRANSACTION', true);
if (MDB2::isError($result)) {
return $result;
}
$this->in_transaction = false;
return MDB2_OK;
}
// }}}
// {{{ rollback()
/**
* 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 $savepoint name of a savepoint to rollback to
*
* @return mixed MDB2_OK on success, a MDB2 error on failure
* @access public
*/
function rollback($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) {
$query = 'ROLLBACK TRANSACTION '.$savepoint;
return $this->_doQuery($query, true);
}
$result =& $this->_doQuery('ROLLBACK TRANSACTION', true);
if (MDB2::isError($result)) {
return $result;
}
$this->in_transaction = false;
return MDB2_OK;
}
// }}}
// {{{ _doConnect()
/**
* do the grunt work of the connect
*
* @param string $username
* @param string $password
* @param boolean $persistent
*
* @return connection on success or MDB2 Error Object on failure
* @access protected
*/
function _doConnect($username, $password, $persistent = false)
{
if ( !extension_loaded($this->phptype)
&& !extension_loaded('sybase_ct')
&& !extension_loaded('odbtp')
&& !function_exists('mssql_connect')
) {
return $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
'extension '.$this->phptype.' is not compiled into PHP', __FUNCTION__);
}
$params = array(
$this->dsn['hostspec'] ? $this->dsn['hostspec'] : 'localhost',
$username ? $username : null,
$password ? $password : null,
);
if ($this->dsn['port']) {
$params[0].= ((substr(PHP_OS, 0, 3) == 'WIN') ? ',' : ':').$this->dsn['port'];
}
if (!$persistent) {
if ($this->_isNewLinkSet()) {
$params[] = true;
} else {
$params[] = false;
}
}
$connect_function = $persistent ? 'mssql_pconnect' : 'mssql_connect';
$connection = @call_user_func_array($connect_function, $params);
if ($connection <= 0) {
return $this->raiseError(MDB2_ERROR_CONNECT_FAILED, null, null,
'unable to establish a connection', __FUNCTION__, __FUNCTION__);
}
@mssql_query('SET ANSI_NULL_DFLT_ON ON', $connection);
/*
if (!empty($this->dsn['charset'])) {
$result = $this->setCharset($this->dsn['charset'], $connection);
if (MDB2::isError($result)) {
return $result;
}
}
*/
if ((bool)ini_get('mssql.datetimeconvert')) {
// his isn't the most elegant way of doing it but it prevents from
// breaking anything thus preserves BC. Bug #11849
if (isset($this->options['datetimeconvert']) && (bool)$this->options['datetimeconvert'] !== false) {
@ini_set('mssql.datetimeconvert', '1');
} else {
@ini_set('mssql.datetimeconvert', '0');
}
}
if (empty($this->dsn['disable_iso_date'])) {
@mssql_query('SET DATEFORMAT ymd', $connection);
}
return $connection;
}
// }}}
// {{{ connect()
/**
* Connect to the database
*
* @return true on success, MDB2 Error Object on failure
*/
function connect()
{
if (is_resource($this->connection)) {
//if (count(array_diff($this->connected_dsn, $this->dsn)) == 0
if (MDB2::areEquals($this->connected_dsn, $this->dsn)
&& $this->opened_persistent == $this->options['persistent']
) {
return MDB2_OK;
}
$this->disconnect(false);
}
$connection = $this->_doConnect(
$this->dsn['username'],
$this->dsn['password'],
$this->options['persistent']
);
if (MDB2::isError($connection)) {
return $connection;
}
$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'] : $this->phptype;
if ($this->database_name) {
if ($this->database_name != $this->connected_database_name) {
if (!@mssql_select_db($this->database_name, $connection)) {
$err = $this->raiseError(null, null, null,
'Could not select the database: '.$this->database_name, __FUNCTION__);
return $err;
}
$this->connected_database_name = $this->database_name;
}
}
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)
{
$connection = $this->_doConnect($this->dsn['username'],
$this->dsn['password'],
$this->options['persistent']);
if (MDB2::isError($connection)) {
return $connection;
}
$result = @mssql_select_db($name, $connection);
$errorInfo = $this->errorInfo(null, $connection);
@mssql_close($connection);
if (!$result) {
if ($errorInfo[0] != MDB2_ERROR_NOT_FOUND) {
exit;
$result = $this->raiseError($errorInfo[0], null, null, $errorInfo[2], __FUNCTION__);
return $result;
}
$result = false;
}
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) {
$ok = @mssql_close($this->connection);
if (!$ok) {
return $this->raiseError(MDB2_ERROR_DISCONNECT_FAILED,
null, null, null, __FUNCTION__);
}
}
} else {
return false;
}
return parent::disconnect($force);
}
// }}}
// {{{ standaloneQuery()
/**
* execute a query as DBA
*
* @param string $query the SQL query
* @param mixed $types array that contains the types of the columns in
* the result set
* @param boolean $is_manip if the query is a manipulation query
* @return mixed MDB2_OK on success, a MDB2 error on failure
* @access public
*/
function standaloneQuery($query, $types = null, $is_manip = false)
{
$user = $this->options['DBA_username']? $this->options['DBA_username'] : $this->dsn['username'];
$pass = $this->options['DBA_password']? $this->options['DBA_password'] : $this->dsn['password'];
$connection = $this->_doConnect($user, $pass, $this->options['persistent']);
if (MDB2::isError($connection)) {
return $connection;
}
$offset = $this->offset;
$limit = $this->limit;
$this->offset = $this->limit = 0;
$query = $this->_modifyQuery($query, $is_manip, $limit, $offset);
$result = $this->_doQuery($query, $is_manip, $connection, $this->database_name);
if (!MDB2::isError($result)) {
$result = $this->_affectedRows($connection, $result);
}
@mssql_close($connection);
return $result;
}
// }}}
// {{{ _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 (MDB2::isError($result)) {
return $result;
}
$query = $result;
}
if ($this->options['disable_query']) {
$result = $is_manip ? 0 : null;
return $result;
}
if (null === $connection) {
$connection = $this->getConnection();
if (MDB2::isError($connection)) {
return $connection;
}
}
if (null === $database_name) {
$database_name = $this->database_name;
}
if ($database_name) {
if ($database_name != $this->connected_database_name) {
if (!@mssql_select_db($database_name, $connection)) {
$err = $this->raiseError(null, null, null,
'Could not select the database: '.$database_name, __FUNCTION__);
return $err;
}
$this->connected_database_name = $database_name;
}
}
$result = @mssql_query($query, $connection);
if (!$result) {
$err = $this->raiseError(null, 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 = $this->getConnection();
if (MDB2::isError($connection)) {
return $connection;
}
}
return @mssql_rows_affected($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, $offset)
{
if ($limit > 0) {
$fetch = $offset + $limit;
if (!$is_manip) {
return preg_replace('/^([\s(])*SELECT( DISTINCT)?(?!\s*TOP\s*\()/i',
"\\1SELECT\\2 TOP $fetch", $query);
}
}
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)
{
if ($this->connected_server_info) {
$server_info = $this->connected_server_info;
} else {
$query = 'SELECT @@VERSION';
$server_info = $this->queryOne($query, 'text');
if (MDB2::isError($server_info)) {
return $server_info;
}
}
// cache server_info
$this->connected_server_info = $server_info;
if (!$native && !MDB2::isError($server_info)) {
if (preg_match('/(\d+)\.(\d+)\.(\d+)/', $server_info, $tmp)) {
$server_info = array(
'major' => $tmp[1],
'minor' => $tmp[2],
'patch' => $tmp[3],
'extra' => null,
'native' => $server_info,
);
} else {
$server_info = array(
'major' => null,
'minor' => null,
'patch' => null,
'extra' => null,
'native' => $server_info,
);
}
}
return $server_info;
}
// }}}
// {{{ _checkSequence
/**
* Checks if there's a sequence that exists.
*
* @param string $seq_name The sequence name to verify.
* @return bool $tableExists The value if the table exists or not
* @access private
*/
function _checkSequence($seq_name)
{
$query = "SELECT * FROM $seq_name";
$tableExists = $this->_doQuery($query, true);
if (MDB2::isError($tableExists)) {
if ($tableExists->getCode() == MDB2_ERROR_NOSUCHTABLE) {
return false;
}
//return $tableExists;
return false;
}
return mssql_result($tableExists, 0, 0);
}
// }}}
// {{{ 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 = $this->quoteIdentifier($this->options['seqcol_name'], true);
$this->pushErrorHandling(PEAR_ERROR_RETURN);
$this->expectError(MDB2_ERROR_NOSUCHTABLE);
$seq_val = $this->_checkSequence($sequence_name);
if ($seq_val) {
$query = "SET IDENTITY_INSERT $sequence_name OFF ".
"INSERT INTO $sequence_name DEFAULT VALUES";
} else {
$query = "INSERT INTO $sequence_name ($seqcol_name) VALUES (0)";
}
$result = $this->_doQuery($query, true);
$this->popExpect();
$this->popErrorHandling();
if (MDB2::isError($result)) {
if ($ondemand && !$this->_checkSequence($sequence_name)) {
$this->loadModule('Manager', null, true);
$result = $this->manager->createSequence($seq_name);
if (MDB2::isError($result)) {
return $this->raiseError($result, null, null,
'on demand sequence '.$seq_name.' could not be created', __FUNCTION__);
} else {
/**
* Little off-by-one problem with the sequence emulation
* here being fixed, that instead of re-calling nextID
* and forcing an increment by one, we simply check if it
* exists, then we get the last inserted id if it does.
*
* In theory, $seq_name should be created otherwise there would
* have been an error thrown somewhere up there..
*
* @todo confirm
*/
if ($this->_checkSequence($seq_name)) {
return $this->lastInsertID($seq_name);
}
return $this->nextID($seq_name, false);
}
}
return $result;
}
$value = $this->lastInsertID($sequence_name);
if (is_numeric($value)) {
$query = "DELETE FROM $sequence_name WHERE $seqcol_name < $value";
$result = $this->_doQuery($query, true);
if (MDB2::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)
{
$server_info = $this->getServerVersion();
if (is_array($server_info) && (null !== $server_info['major'])
&& $server_info['major'] >= 8
) {
$query = "SELECT IDENT_CURRENT('$table')";
} else {
$query = "SELECT @@IDENTITY";
if (null !== $table) {
$query .= ' FROM '.$this->quoteIdentifier($table, true);
}
}
return $this->queryOne($query, 'integer');
}
// }}}
}
// }}}
// {{{ Class MDB2_Result_mssql
/**
* MDB2 MSSQL Server result driver
*
* @package MDB2
* @category Database
* @author Frank M. Kromann <frank@kromann.info>
*/
class MDB2_Result_mssql extends MDB2_Result_Common
{
// {{{ _skipLimitOffset()
/**
* Skip the first row of a result set.
*
* @param resource $result
* @return mixed a result handle or MDB2_OK on success, a MDB2 error on failure
* @access protected
*/
function _skipLimitOffset()
{
if ($this->limit) {
if ($this->rownum >= $this->limit) {
return false;
}
}
if ($this->offset) {
while ($this->offset_count < $this->offset) {
++$this->offset_count;
if (!is_array(@mssql_fetch_row($this->result))) {
$this->offset_count = $this->limit;
return false;
}
}
}
return MDB2_OK;
}
// }}}
// {{{ 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, $rownum = null)
{
if (!$this->_skipLimitOffset()) {
return null;
}
if (null !== $rownum) {
$seek = $this->seek($rownum);
if (MDB2::isError($seek)) {
return $seek;
}
}
if ($fetchmode == MDB2_FETCHMODE_DEFAULT) {
$fetchmode = $this->db->fetchmode;
}
if ( $fetchmode == MDB2_FETCHMODE_ASSOC
|| $fetchmode == MDB2_FETCHMODE_OBJECT
) {
$row = @mssql_fetch_assoc($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 {
$row = @mssql_fetch_row($this->result);
}
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 ( ( $fetchmode != MDB2_FETCHMODE_ASSOC
&& $fetchmode != MDB2_FETCHMODE_OBJECT)
&& !empty($this->types)
) {
$row = $this->db->datatype->convertResultRow($this->types, $row, $rtrim);
} elseif (($fetchmode == MDB2_FETCHMODE_ASSOC
|| $fetchmode == MDB2_FETCHMODE_OBJECT)
&& !empty($this->types_assoc)
) {
$row = $this->db->datatype->convertResultRow($this->types_assoc, $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 = $this->numCols();
if (MDB2::isError($numcols)) {
return $numcols;
}
for ($column = 0; $column < $numcols; $column++) {
$column_name = @mssql_field_name($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()
{
$cols = @mssql_num_fields($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;
}
// }}}
// {{{ nextResult()
/**
* Move the internal result pointer to the next available result
*
* @return true on success, false if there is no more result set or an error object on failure
* @access public
*/
function nextResult()
{
if (false === $this->result) {
return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
'resultset has already been freed', __FUNCTION__);
}
if (null === $this->result) {
return false;
}
return @mssql_next_result($this->result);
}
// }}}
// {{{ free()
/**
* Free the internal resources associated with $result.
*
* @return boolean true on success, false if $result is invalid
* @access public
*/
function free()
{
if (is_resource($this->result) && $this->db->connection) {
$free = @mssql_free_result($this->result);
if (false === $free) {
return $this->db->raiseError(null, null, null,
'Could not free result', __FUNCTION__);
}
}
$this->result = false;
return MDB2_OK;
}
// }}}
}
// }}}
// {{{ class MDB2_BufferedResult_mssql
/**
* MDB2 MSSQL Server buffered result driver
*
* @package MDB2
* @category Database
* @author Frank M. Kromann <frank@kromann.info>
*/
class MDB2_BufferedResult_mssql extends MDB2_Result_mssql
{
// {{{ 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) && !@mssql_data_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 = $this->numRows();
if (MDB2::isError($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()
{
$rows = @mssql_num_rows($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 $this->db->raiseError(null, null, null,
'Could not get row count', __FUNCTION__);
}
if ($this->limit) {
$rows -= $this->offset;
if ($rows > $this->limit + 1) {
$rows = $this->limit + 1;
}
if ($rows < 0) {
$rows = 0;
}
}
return $rows;
}
}
// }}}
// {{{ MDB2_Statement_mssql
/**
* MDB2 MSSQL Server statement driver
*
* @package MDB2
* @category Database
* @author Frank M. Kromann <frank@kromann.info>
*/
class MDB2_Statement_mssql extends MDB2_Statement_Common
{
}
// }}}
?>
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