githubFork/roundcubemail.git

			@@ -1,815 +1,1129 @@
			<?php
			// +----------------------------------------------------------------------+
			// \| PHP versions 4 and 5 \|
			// +----------------------------------------------------------------------+
			// \| Copyright (c) 1998-2007 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. \|
			// +----------------------------------------------------------------------+
			// \| Authors: Frank M. Kromann <frank@kromann.info> \|
			// \| David Coallier <davidc@php.net> \|
			// \| Lorenzo Alberton <l.alberton@quipo.it> \|
			// +----------------------------------------------------------------------+
			//
			// $Id: mssql.php,v 1.93 2007/12/03 20:59:15 quipo Exp $
			//

			require_once 'MDB2/Driver/Manager/Common.php';

			// {{{ class MDB2_Driver_Manager_mssql

			/**
			* MDB2 MSSQL driver for the management modules
			*
			* @package MDB2
			* @category Database
			* @author Frank M. Kromann <frank@kromann.info>
			* @author David Coallier <davidc@php.net>
			* @author Lorenzo Alberton <l.alberton@quipo.it>
			*/
			class MDB2_Driver_Manager_mssql extends MDB2_Driver_Manager_Common
			{
			// {{{ createDatabase()
			/**
			* create a new database
			*
			* @param string $name name of the database that should be created
			* @param array $options array with collation info
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createDatabase($name, $options = array())
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$name = $db->quoteIdentifier($name, true);
			$query = "CREATE DATABASE $name";
			if ($db->options['database_device']) {
			$query.= ' ON '.$db->options['database_device'];
			$query.= $db->options['database_size'] ? '=' .
			$db->options['database_size'] : '';
			}
			if (!empty($options['collation'])) {
			$query .= ' COLLATE ' . $options['collation'];
			}
			return $db->standaloneQuery($query, null, true);
			}

			// }}}
			// {{{ dropDatabase()

			/**
			* drop an existing database
			*
			* @param string $name name of the database that should be dropped
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function dropDatabase($name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$name = $db->quoteIdentifier($name, true);
			return $db->standaloneQuery("DROP DATABASE $name", null, true);
			}

			// }}}
			// {{{ _getTemporaryTableQuery()

			/**
			* Override the parent method.
			*
			* @return string The string required to be placed between "CREATE" and "TABLE"
			* to generate a temporary table, if possible.
			*/
			function _getTemporaryTableQuery()
			{
			return '';
			}

			// }}}
			// {{{ _getAdvancedFKOptions()

			/**
			* Return the FOREIGN KEY query section dealing with non-standard options
			* as MATCH, INITIALLY DEFERRED, ON UPDATE, ...
			*
			* @param array $definition
			*
			* @return string
			* @access protected
			*/
			function _getAdvancedFKOptions($definition)
			{
			$query = '';
			if (!empty($definition['onupdate'])) {
			$query .= ' ON UPDATE '.$definition['onupdate'];
			}
			if (!empty($definition['ondelete'])) {
			$query .= ' ON DELETE '.$definition['ondelete'];
			}
			return $query;
			}

			// }}}
			// {{{ createTable()

			/**
			* create a new table
			*
			* @param string $name Name of the database that should be created
			* @param array $fields Associative array that contains the definition of each field of the new table
			* The indexes of the array entries are the names of the fields of the table an
			* the array entry values are associative arrays like those that are meant to be
			* passed with the field definitions to get[Type]Declaration() functions.
			*
			* Example
			* array(
			*
			* 'id' => array(
			* 'type' => 'integer',
			* 'unsigned' => 1,
			* 'notnull' => 1,
			* 'default' => 0,
			* ),
			* 'name' => array(
			* 'type' => 'text',
			* 'length' => 12,
			* ),
			* 'description' => array(
			* 'type' => 'text',
			* 'length' => 12,
			* )
			* );
			* @param array $options An associative array of table options:
			* array(
			* 'comment' => 'Foo',
			* 'temporary' => true\|false,
			* );
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createTable($name, $fields, $options = array())
			{
			if (!empty($options['temporary'])) {
			$name = '#'.$name;
			}
			return parent::createTable($name, $fields, $options);
			}

			// }}}
			// {{{ alterTable()

			/**
			* alter an existing table
			*
			* @param string $name name of the table that is intended to be changed.
			* @param array $changes associative array that contains the details of each type
			* of change that is intended to be performed. The types of
			* changes that are currently supported are defined as follows:
			*
			* name
			*
			* New name for the table.
			*
			* add
			*
			* Associative array with the names of fields to be added as
			* indexes of the array. The value of each entry of the array
			* should be set to another associative array with the properties
			* of the fields to be added. The properties of the fields should
			* be the same as defined by the MDB2 parser.
			*
			*
			* remove
			*
			* Associative array with the names of fields to be removed as indexes
			* of the array. Currently the values assigned to each entry are ignored.
			* An empty array should be used for future compatibility.
			*
			* rename
			*
			* Associative array with the names of fields to be renamed as indexes
			* of the array. The value of each entry of the array should be set to
			* another associative array with the entry named name with the new
			* field name and the entry named Declaration that is expected to contain
			* the portion of the field declaration already in DBMS specific SQL code
			* as it is used in the CREATE TABLE statement.
			*
			* change
			*
			* Associative array with the names of the fields to be changed as indexes
			* of the array. Keep in mind that if it is intended to change either the
			* name of a field and any other properties, the change array entries
			* should have the new names of the fields as array indexes.
			*
			* The value of each entry of the array should be set to another associative
			* array with the properties of the fields to that are meant to be changed as
			* array entries. These entries should be assigned to the new values of the
			* respective properties. The properties of the fields should be the same
			* as defined by the MDB2 parser.
			*
			* Example
			* array(
			* 'name' => 'userlist',
			* 'add' => array(
			* 'quota' => array(
			* 'type' => 'integer',
			* 'unsigned' => 1
			* )
			* ),
			* 'remove' => array(
			* 'file_limit' => array(),
			* 'time_limit' => array()
			* ),
			* 'change' => array(
			* 'name' => array(
			* 'length' => '20',
			* 'definition' => array(
			* 'type' => 'text',
			* 'length' => 20,
			* ),
			* )
			* ),
			* 'rename' => array(
			* 'sex' => array(
			* 'name' => 'gender',
			* 'definition' => array(
			* 'type' => 'text',
			* 'length' => 1,
			* 'default' => 'M',
			* ),
			* )
			* )
			* )
			*
			* @param boolean $check indicates whether the function should just check if the DBMS driver
			* can perform the requested table alterations if the value is true or
			* actually perform them otherwise.
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function alterTable($name, $changes, $check)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			foreach ($changes as $change_name => $change) {
			switch ($change_name) {
			case 'add':
			break;
			case 'remove':
			break;
			case 'name':
			case 'rename':
			case 'change':
			default:
			return $db->raiseError(MDB2_ERROR_CANNOT_ALTER, null, null,
			'change type "'.$change_name.'" not yet supported', __FUNCTION__);
			}
			}

			if ($check) {
			return MDB2_OK;
			}

			$query = '';
			if (!empty($changes['add']) && is_array($changes['add'])) {
			foreach ($changes['add'] as $field_name => $field) {
			if ($query) {
			$query.= ', ';
			} else {
			$query.= 'ADD COLUMN ';
			}
			$query.= $db->getDeclaration($field['type'], $field_name, $field);
			}
			}

			if (!empty($changes['remove']) && is_array($changes['remove'])) {
			foreach ($changes['remove'] as $field_name => $field) {
			if ($query) {
			$query.= ', ';
			}
			$field_name = $db->quoteIdentifier($field_name, true);
			$query.= 'DROP COLUMN ' . $field_name;
			}
			}

			if (!$query) {
			return MDB2_OK;
			}

			$name = $db->quoteIdentifier($name, true);
			return $db->exec("ALTER TABLE $name $query");
			}

			// }}}
			// {{{ listTables()

			/**
			* list all tables in the current database
			*
			* @return mixed array of table names on success, a MDB2 error on failure
			* @access public
			*/
			function listTables()
			{
			$db =& $this->getDBInstance();

			if (PEAR::isError($db)) {
			return $db;
			}

			$query = 'EXEC sp_tables @table_type = "\'TABLE\'"';
			$table_names = $db->queryCol($query, null, 2);
			if (PEAR::isError($table_names)) {
			return $table_names;
			}
			$result = array();
			foreach ($table_names as $table_name) {
			if (!$this->_fixSequenceName($table_name, true)) {
			$result[] = $table_name;
			}
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ?
			'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ listTableFields()

			/**
			* list all fields in a table in the current database
			*
			* @param string $table name of table that should be used in method
			*
			* @return mixed array of field names on success, a MDB2 error on failure
			* @access public
			*/
			function listTableFields($table)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$table = $db->quoteIdentifier($table, true);
			$columns = $db->queryCol("SELECT c.name
			FROM syscolumns c
			LEFT JOIN sysobjects o ON c.id = o.id
			WHERE o.name = '$table'");
			if (PEAR::isError($columns)) {
			return $columns;
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$columns = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $columns);
			}
			return $columns;
			}

			// }}}
			// {{{ listTableIndexes()

			/**
			* list all indexes in a table
			*
			* @param string $table name of table that should be used in method
			*
			* @return mixed array of index names on success, a MDB2 error on failure
			* @access public
			*/
			function listTableIndexes($table)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$key_name = 'INDEX_NAME';
			$pk_name = 'PK_NAME';
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			if ($db->options['field_case'] == CASE_LOWER) {
			$key_name = strtolower($key_name);
			$pk_name = strtolower($pk_name);
			} else {
			$key_name = strtoupper($key_name);
			$pk_name = strtoupper($pk_name);
			}
			}
			$table = $db->quote($table, 'text');
			$query = "EXEC sp_statistics @table_name=$table";
			$indexes = $db->queryCol($query, 'text', $key_name);
			if (PEAR::isError($indexes)) {
			return $indexes;
			}
			$query = "EXEC sp_pkeys @table_name=$table";
			$pk_all = $db->queryCol($query, 'text', $pk_name);
			$result = array();
			foreach ($indexes as $index) {
			if (!in_array($index, $pk_all) && ($index = $this->_fixIndexName($index))) {
			$result[$index] = true;
			}
			}

			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_change_key_case($result, $db->options['field_case']);
			}
			return array_keys($result);
			}

			// }}}
			// {{{ listDatabases()

			/**
			* list all databases
			*
			* @return mixed array of database names on success, a MDB2 error on failure
			* @access public
			*/
			function listDatabases()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$result = $db->queryCol('SELECT name FROM sys.databases');
			if (PEAR::isError($result)) {
			return $result;
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ listUsers()

			/**
			* list all users
			*
			* @return mixed array of user names on success, a MDB2 error on failure
			* @access public
			*/
			function listUsers()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$result = $db->queryCol('SELECT DISTINCT loginame FROM master..sysprocesses');
			if (PEAR::isError($result) \|\| empty($result)) {
			return $result;
			}
			foreach (array_keys($result) as $k) {
			$result[$k] = trim($result[$k]);
			}
			return $result;
			}

			// }}}
			// {{{ listFunctions()

			/**
			* list all functions in the current database
			*
			* @return mixed array of function names on success, a MDB2 error on failure
			* @access public
			*/
			function listFunctions()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = "SELECT name
			FROM sysobjects
			WHERE objectproperty(id, N'IsMSShipped') = 0
			AND (objectproperty(id, N'IsTableFunction') = 1
			OR objectproperty(id, N'IsScalarFunction') = 1)";
			/*
			SELECT ROUTINE_NAME
			FROM INFORMATION_SCHEMA.ROUTINES
			WHERE ROUTINE_TYPE = 'FUNCTION'
			*/
			$result = $db->queryCol($query);
			if (PEAR::isError($result)) {
			return $result;
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ listTableTriggers()

			/**
			* list all triggers in the database that reference a given table
			*
			* @param string table for which all referenced triggers should be found
			*
			* @return mixed array of trigger names on success, otherwise, false which
			* could be a db error if the db is not instantiated or could
			* be the results of the error that occured during the
			* querying of the sysobject module.
			* @access public
			*/
			function listTableTriggers($table = null)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$table = $db->quote($table, 'text');
			$query = "SELECT o.name
			FROM sysobjects o
			WHERE xtype = 'TR'
			AND OBJECTPROPERTY(o.id, 'IsMSShipped') = 0";
			if (!is_null($table)) {
			$query .= " AND object_name(parent_obj) = $table";
			}

			$result = $db->queryCol($query);
			if (PEAR::isError($result)) {
			return $result;
			}

			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE &&
			$db->options['field_case'] == CASE_LOWER)
			{
			$result = array_map(($db->options['field_case'] == CASE_LOWER ?
			'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ listViews()

			/**
			* list all views in the current database
			*
			* @param string database, the current is default
			*
			* @return mixed array of view names on success, a MDB2 error on failure
			* @access public
			*/
			function listViews()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = "SELECT name
			FROM sysobjects
			WHERE xtype = 'V'";
			/*
			SELECT *
			FROM sysobjects
			WHERE objectproperty(id, N'IsMSShipped') = 0
			AND objectproperty(id, N'IsView') = 1
			*/

			$result = $db->queryCol($query);
			if (PEAR::isError($result)) {
			return $result;
			}

			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE &&
			$db->options['field_case'] == CASE_LOWER)
			{
			$result = array_map(($db->options['field_case'] == CASE_LOWER ?
			'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ dropIndex()

			/**
			* drop existing index
			*
			* @param string $table name of table that should be used in method
			* @param string $name name of the index to be dropped
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function dropIndex($table, $name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$table = $db->quoteIdentifier($table, true);
			$name = $db->quoteIdentifier($db->getIndexName($name), true);
			return $db->exec("DROP INDEX $table.$name");
			}

			// }}}
			// {{{ listTableConstraints()

			/**
			* list all constraints in a table
			*
			* @param string $table name of table that should be used in method
			*
			* @return mixed array of constraint names on success, a MDB2 error on failure
			* @access public
			*/
			function listTableConstraints($table)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}
			$table = $db->quoteIdentifier($table, true);

			$query = "SELECT c.constraint_name
			FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS c
			WHERE c.constraint_catalog = DB_NAME()
			AND c.table_name = '$table'";
			$constraints = $db->queryCol($query);
			if (PEAR::isError($constraints)) {
			return $constraints;
			}

			$result = array();
			foreach ($constraints as $constraint) {
			$constraint = $this->_fixIndexName($constraint);
			if (!empty($constraint)) {
			$result[$constraint] = true;
			}
			}

			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_change_key_case($result, $db->options['field_case']);
			}
			return array_keys($result);
			}

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

			/**
			* create sequence
			*
			* @param string $seq_name name of the sequence to be created
			* @param string $start start value of the sequence; default is 1
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createSequence($seq_name, $start = 1)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$sequence_name = $db->quoteIdentifier($db->getSequenceName($seq_name), true);
			$seqcol_name = $db->quoteIdentifier($db->options['seqcol_name'], true);
			$query = "CREATE TABLE $sequence_name ($seqcol_name " .
			"INT PRIMARY KEY CLUSTERED IDENTITY($start,1) NOT NULL)";

			$res = $db->exec($query);
			if (PEAR::isError($res)) {
			return $res;
			}

			$query = "SET IDENTITY_INSERT $sequence_name ON ".
			"INSERT INTO $sequence_name ($seqcol_name) VALUES ($start)";
			$res = $db->exec($query);

			if (!PEAR::isError($res)) {
			return MDB2_OK;
			}

			$result = $db->exec("DROP TABLE $sequence_name");
			if (PEAR::isError($result)) {
			return $db->raiseError($result, null, null,
			'could not drop inconsistent sequence table', __FUNCTION__);
			}

			return $db->raiseError($res, null, null,
			'could not create sequence table', __FUNCTION__);
			}

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

			/**
			* This function drops an existing sequence
			*
			* @param string $seq_name name of the sequence to be dropped
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function dropSequence($seq_name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$sequence_name = $db->quoteIdentifier($db->getSequenceName($seq_name), true);
			return $db->exec("DROP TABLE $sequence_name");
			}

			// }}}
			// {{{ listSequences()

			/**
			* list all sequences in the current database
			*
			* @return mixed array of sequence names on success, a MDB2 error on failure
			* @access public
			*/
			function listSequences()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = "SELECT name FROM sysobjects WHERE xtype = 'U'";
			$table_names = $db->queryCol($query);
			if (PEAR::isError($table_names)) {
			return $table_names;
			}
			$result = array();
			foreach ($table_names as $table_name) {
			if ($sqn = $this->_fixSequenceName($table_name, true)) {
			$result[] = $sqn;
			}
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ?
			'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			}

			// }}}
			<?php
			// +----------------------------------------------------------------------+
			// \| 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. \|
			// +----------------------------------------------------------------------+
			// \| Authors: Frank M. Kromann <frank@kromann.info> \|
			// \| David Coallier <davidc@php.net> \|
			// \| Lorenzo Alberton <l.alberton@quipo.it> \|
			// +----------------------------------------------------------------------+
			//
			// $Id: mssql.php,v 1.109 2008/03/05 12:55:57 afz Exp $
			//

			require_once 'MDB2/Driver/Manager/Common.php';

			// {{{ class MDB2_Driver_Manager_mssql

			/**
			* MDB2 MSSQL driver for the management modules
			*
			* @package MDB2
			* @category Database
			* @author Frank M. Kromann <frank@kromann.info>
			* @author David Coallier <davidc@php.net>
			* @author Lorenzo Alberton <l.alberton@quipo.it>
			*/
			class MDB2_Driver_Manager_mssql extends MDB2_Driver_Manager_Common
			{
			// {{{ createDatabase()
			/**
			* create a new database
			*
			* @param string $name name of the database that should be created
			* @param array $options array with collation info
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createDatabase($name, $options = array())
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$name = $db->quoteIdentifier($name, true);
			$query = "CREATE DATABASE $name";
			if ($db->options['database_device']) {
			$query.= ' ON '.$db->options['database_device'];
			$query.= $db->options['database_size'] ? '=' .
			$db->options['database_size'] : '';
			}
			if (!empty($options['collation'])) {
			$query .= ' COLLATE ' . $options['collation'];
			}
			return $db->standaloneQuery($query, null, true);
			}

			// }}}
			// {{{ alterDatabase()

			/**
			* alter an existing database
			*
			* @param string $name name of the database that is intended to be changed
			* @param array $options array with name, collation info
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function alterDatabase($name, $options = array())
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = '';
			if (!empty($options['name'])) {
			$query .= ' MODIFY NAME = ' .$db->quoteIdentifier($options['name'], true);
			}
			if (!empty($options['collation'])) {
			$query .= ' COLLATE ' . $options['collation'];
			}
			if (!empty($query)) {
			$query = 'ALTER DATABASE '. $db->quoteIdentifier($name, true) . $query;
			return $db->standaloneQuery($query, null, true);
			}
			return MDB2_OK;
			}

			// }}}
			// {{{ dropDatabase()

			/**
			* drop an existing database
			*
			* @param string $name name of the database that should be dropped
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function dropDatabase($name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$name = $db->quoteIdentifier($name, true);
			return $db->standaloneQuery("DROP DATABASE $name", null, true);
			}

			// }}}
			// {{{ _getTemporaryTableQuery()

			/**
			* Override the parent method.
			*
			* @return string The string required to be placed between "CREATE" and "TABLE"
			* to generate a temporary table, if possible.
			*/
			function _getTemporaryTableQuery()
			{
			return '';
			}

			// }}}
			// {{{ _getAdvancedFKOptions()

			/**
			* Return the FOREIGN KEY query section dealing with non-standard options
			* as MATCH, INITIALLY DEFERRED, ON UPDATE, ...
			*
			* @param array $definition
			*
			* @return string
			* @access protected
			*/
			function _getAdvancedFKOptions($definition)
			{
			$query = '';
			if (!empty($definition['onupdate'])) {
			$query .= ' ON UPDATE '.$definition['onupdate'];
			}
			if (!empty($definition['ondelete'])) {
			$query .= ' ON DELETE '.$definition['ondelete'];
			}
			return $query;
			}

			// }}}
			// {{{ createTable()

			/**
			* create a new table
			*
			* @param string $name Name of the database that should be created
			* @param array $fields Associative array that contains the definition of each field of the new table
			* The indexes of the array entries are the names of the fields of the table an
			* the array entry values are associative arrays like those that are meant to be
			* passed with the field definitions to get[Type]Declaration() functions.
			*
			* Example
			* array(
			*
			* 'id' => array(
			* 'type' => 'integer',
			* 'unsigned' => 1,
			* 'notnull' => 1,
			* 'default' => 0,
			* ),
			* 'name' => array(
			* 'type' => 'text',
			* 'length' => 12,
			* ),
			* 'description' => array(
			* 'type' => 'text',
			* 'length' => 12,
			* )
			* );
			* @param array $options An associative array of table options:
			* array(
			* 'comment' => 'Foo',
			* 'temporary' => true\|false,
			* );
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createTable($name, $fields, $options = array())
			{
			if (!empty($options['temporary'])) {
			$name = '#'.$name;
			}
			return parent::createTable($name, $fields, $options);
			}

			// }}}
			// {{{ truncateTable()

			/**
			* Truncate an existing table (if the TRUNCATE TABLE syntax is not supported,
			* it falls back to a DELETE FROM TABLE query)
			*
			* @param string $name name of the table that should be truncated
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function truncateTable($name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$name = $db->quoteIdentifier($name, true);
			return $db->exec("TRUNCATE TABLE $name");
			}

			// }}}
			// {{{ vacuum()

			/**
			* Optimize (vacuum) all the tables in the db (or only the specified table)
			* and optionally run ANALYZE.
			*
			* @param string $table table name (all the tables if empty)
			* @param array $options an array with driver-specific options:
			* - timeout [int] (in seconds) [mssql-only]
			* - analyze [boolean] [pgsql and mysql]
			* - full [boolean] [pgsql-only]
			* - freeze [boolean] [pgsql-only]
			*
			* NB: you have to run the NSControl Create utility to enable VACUUM
			*
			* @return mixed MDB2_OK success, a MDB2 error on failure
			* @access public
			*/
			function vacuum($table = null, $options = array())
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}
			$timeout = isset($options['timeout']) ? (int)$options['timeout'] : 300;

			$query = 'NSControl Create';
			$result = $db->exec($query);
			if (PEAR::isError($result)) {
			return $result;
			}

			return $db->exec('EXEC NSVacuum '.$timeout);
			}

			// }}}
			// {{{ alterTable()

			/**
			* alter an existing table
			*
			* @param string $name name of the table that is intended to be changed.
			* @param array $changes associative array that contains the details of each type
			* of change that is intended to be performed. The types of
			* changes that are currently supported are defined as follows:
			*
			* name
			*
			* New name for the table.
			*
			* add
			*
			* Associative array with the names of fields to be added as
			* indexes of the array. The value of each entry of the array
			* should be set to another associative array with the properties
			* of the fields to be added. The properties of the fields should
			* be the same as defined by the MDB2 parser.
			*
			*
			* remove
			*
			* Associative array with the names of fields to be removed as indexes
			* of the array. Currently the values assigned to each entry are ignored.
			* An empty array should be used for future compatibility.
			*
			* rename
			*
			* Associative array with the names of fields to be renamed as indexes
			* of the array. The value of each entry of the array should be set to
			* another associative array with the entry named name with the new
			* field name and the entry named Declaration that is expected to contain
			* the portion of the field declaration already in DBMS specific SQL code
			* as it is used in the CREATE TABLE statement.
			*
			* change
			*
			* Associative array with the names of the fields to be changed as indexes
			* of the array. Keep in mind that if it is intended to change either the
			* name of a field and any other properties, the change array entries
			* should have the new names of the fields as array indexes.
			*
			* The value of each entry of the array should be set to another associative
			* array with the properties of the fields to that are meant to be changed as
			* array entries. These entries should be assigned to the new values of the
			* respective properties. The properties of the fields should be the same
			* as defined by the MDB2 parser.
			*
			* Example
			* array(
			* 'name' => 'userlist',
			* 'add' => array(
			* 'quota' => array(
			* 'type' => 'integer',
			* 'unsigned' => 1
			* )
			* ),
			* 'remove' => array(
			* 'file_limit' => array(),
			* 'time_limit' => array()
			* ),
			* 'change' => array(
			* 'name' => array(
			* 'length' => '20',
			* 'definition' => array(
			* 'type' => 'text',
			* 'length' => 20,
			* ),
			* )
			* ),
			* 'rename' => array(
			* 'sex' => array(
			* 'name' => 'gender',
			* 'definition' => array(
			* 'type' => 'text',
			* 'length' => 1,
			* 'default' => 'M',
			* ),
			* )
			* )
			* )
			*
			* @param boolean $check indicates whether the function should just check if the DBMS driver
			* can perform the requested table alterations if the value is true or
			* actually perform them otherwise.
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function alterTable($name, $changes, $check)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}
			$name_quoted = $db->quoteIdentifier($name, true);

			foreach ($changes as $change_name => $change) {
			switch ($change_name) {
			case 'remove':
			case 'rename':
			case 'add':
			case 'change':
			case 'name':
			break;
			default:
			return $db->raiseError(MDB2_ERROR_CANNOT_ALTER, null, null,
			'change type "'.$change_name.'" not yet supported', __FUNCTION__);
			}
			}

			if ($check) {
			return MDB2_OK;
			}

			$idxname_format = $db->getOption('idxname_format');
			$db->setOption('idxname_format', '%s');

			if (!empty($changes['remove']) && is_array($changes['remove'])) {
			$result = $this->_dropConflictingIndices($name, array_keys($changes['remove']));
			if (PEAR::isError($result)) {
			$db->setOption('idxname_format', $idxname_format);
			return $result;
			}
			$result = $this->_dropConflictingConstraints($name, array_keys($changes['remove']));
			if (PEAR::isError($result)) {
			$db->setOption('idxname_format', $idxname_format);
			return $result;
			}

			$query = '';
			foreach ($changes['remove'] as $field_name => $field) {
			if ($query) {
			$query.= ', ';
			}
			$field_name = $db->quoteIdentifier($field_name, true);
			$query.= 'COLUMN ' . $field_name;
			}

			$result = $db->exec("ALTER TABLE $name_quoted DROP $query");
			if (PEAR::isError($result)) {
			$db->setOption('idxname_format', $idxname_format);
			return $result;
			}
			}

			if (!empty($changes['rename']) && is_array($changes['rename'])) {
			foreach ($changes['rename'] as $field_name => $field) {
			$field_name = $db->quoteIdentifier($field_name, true);
			$result = $db->exec("sp_rename '$name_quoted.$field_name', '".$field['name']."', 'COLUMN'");
			if (PEAR::isError($result)) {
			$db->setOption('idxname_format', $idxname_format);
			return $result;
			}
			}
			}

			if (!empty($changes['add']) && is_array($changes['add'])) {
			$query = '';
			foreach ($changes['add'] as $field_name => $field) {
			if ($query) {
			$query.= ', ';
			} else {
			$query.= 'ADD ';
			}
			$query.= $db->getDeclaration($field['type'], $field_name, $field);
			}

			$result = $db->exec("ALTER TABLE $name_quoted $query");
			if (PEAR::isError($result)) {
			$db->setOption('idxname_format', $idxname_format);
			return $result;
			}
			}

			$dropped_indices = array();
			$dropped_constraints = array();

			if (!empty($changes['change']) && is_array($changes['change'])) {
			$dropped = $this->_dropConflictingIndices($name, array_keys($changes['change']));
			if (PEAR::isError($dropped)) {
			$db->setOption('idxname_format', $idxname_format);
			return $dropped;
			}
			$dropped_indices = array_merge($dropped_indices, $dropped);
			$dropped = $this->_dropConflictingConstraints($name, array_keys($changes['change']));
			if (PEAR::isError($dropped)) {
			$db->setOption('idxname_format', $idxname_format);
			return $dropped;
			}
			$dropped_constraints = array_merge($dropped_constraints, $dropped);

			foreach ($changes['change'] as $field_name => $field) {
			//MSSQL doesn't allow multiple ALTER COLUMNs in one query
			$query = 'ALTER COLUMN ';

			//MSSQL doesn't allow changing the DEFAULT value of a field in altering mode
			if (array_key_exists('default', $field['definition'])) {
			unset($field['definition']['default']);
			}

			$query .= $db->getDeclaration($field['definition']['type'], $field_name, $field['definition']);
			$result = $db->exec("ALTER TABLE $name_quoted $query");
			if (PEAR::isError($result)) {
			$db->setOption('idxname_format', $idxname_format);
			return $result;
			}
			}
			}

			// restore the dropped conflicting indices and constraints
			foreach ($dropped_indices as $index_name => $index) {
			$result = $this->createIndex($name, $index_name, $index);
			if (PEAR::isError($result)) {
			$db->setOption('idxname_format', $idxname_format);
			return $result;
			}
			}
			foreach ($dropped_constraints as $constraint_name => $constraint) {
			$result = $this->createConstraint($name, $constraint_name, $constraint);
			if (PEAR::isError($result)) {
			$db->setOption('idxname_format', $idxname_format);
			return $result;
			}
			}

			$db->setOption('idxname_format', $idxname_format);

			if (!empty($changes['name'])) {
			$new_name = $db->quoteIdentifier($changes['name'], true);
			$result = $db->exec("sp_rename '$name_quoted', '$new_name'");
			if (PEAR::isError($result)) {
			return $result;
			}
			}

			return MDB2_OK;
			}

			// }}}
			// {{{ _dropConflictingIndices()

			/**
			* Drop the indices that prevent a successful ALTER TABLE action
			*
			* @param string $table table name
			* @param array $fields array of names of the fields affected by the change
			*
			* @return array dropped indices definitions
			*/
			function _dropConflictingIndices($table, $fields)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$dropped = array();
			$index_names = $this->listTableIndexes($table);
			if (PEAR::isError($index_names)) {
			return $index_names;
			}
			$db->loadModule('Reverse');
			$indexes = array();
			foreach ($index_names as $index_name) {
			$idx_def = $db->reverse->getTableIndexDefinition($table, $index_name);
			if (!PEAR::isError($idx_def)) {
			$indexes[$index_name] = $idx_def;
			}
			}
			foreach ($fields as $field_name) {
			foreach ($indexes as $index_name => $index) {
			if (!isset($dropped[$index_name]) && array_key_exists($field_name, $index['fields'])) {
			$dropped[$index_name] = $index;
			$result = $this->dropIndex($table, $index_name);
			if (PEAR::isError($result)) {
			return $result;
			}
			}
			}
			}

			return $dropped;
			}

			// }}}
			// {{{ _dropConflictingConstraints()

			/**
			* Drop the constraints that prevent a successful ALTER TABLE action
			*
			* @param string $table table name
			* @param array $fields array of names of the fields affected by the change
			*
			* @return array dropped constraints definitions
			*/
			function _dropConflictingConstraints($table, $fields)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$dropped = array();
			$constraint_names = $this->listTableConstraints($table);
			if (PEAR::isError($constraint_names)) {
			return $constraint_names;
			}
			$db->loadModule('Reverse');
			$constraints = array();
			foreach ($constraint_names as $constraint_name) {
			$cons_def = $db->reverse->getTableConstraintDefinition($table, $constraint_name);
			if (!PEAR::isError($cons_def)) {
			$constraints[$constraint_name] = $cons_def;
			}
			}
			foreach ($fields as $field_name) {
			foreach ($constraints as $constraint_name => $constraint) {
			if (!isset($dropped[$constraint_name]) && array_key_exists($field_name, $constraint['fields'])) {
			$dropped[$constraint_name] = $constraint;
			$result = $this->dropConstraint($table, $constraint_name);
			if (PEAR::isError($result)) {
			return $result;
			}
			}
			}
			// also drop implicit DEFAULT constraints
			$default = $this->_getTableFieldDefaultConstraint($table, $field_name);
			if (!PEAR::isError($default) && !empty($default)) {
			$result = $this->dropConstraint($table, $default);
			if (PEAR::isError($result)) {
			return $result;
			}
			}
			}

			return $dropped;
			}

			// }}}
			// {{{ _getTableFieldDefaultConstraint()

			/**
			* Get the default constraint for a table field
			*
			* @param string $table name of table that should be used in method
			* @param string $field name of field that should be used in method
			*
			* @return mixed name of default constraint on success, a MDB2 error on failure
			* @access private
			*/
			function _getTableFieldDefaultConstraint($table, $field)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$table = $db->quoteIdentifier($table, true);
			$field = $db->quote($field, 'text');
			$query = "SELECT OBJECT_NAME(syscolumns.cdefault)
			FROM syscolumns
			WHERE syscolumns.id = object_id('$table')
			AND syscolumns.name = $field
			AND syscolumns.cdefault <> 0";
			return $db->queryOne($query);
			}

			// }}}
			// {{{ listTables()

			/**
			* list all tables in the current database
			*
			* @return mixed array of table names on success, a MDB2 error on failure
			* @access public
			*/
			function listTables()
			{
			$db =& $this->getDBInstance();

			if (PEAR::isError($db)) {
			return $db;
			}

			$query = 'EXEC sp_tables @table_type = "\'TABLE\'"';
			$table_names = $db->queryCol($query, null, 2);
			if (PEAR::isError($table_names)) {
			return $table_names;
			}
			$result = array();
			foreach ($table_names as $table_name) {
			if (!$this->_fixSequenceName($table_name, true)) {
			$result[] = $table_name;
			}
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ?
			'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ listTableFields()

			/**
			* list all fields in a table in the current database
			*
			* @param string $table name of table that should be used in method
			*
			* @return mixed array of field names on success, a MDB2 error on failure
			* @access public
			*/
			function listTableFields($table)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$table = $db->quoteIdentifier($table, true);
			$columns = $db->queryCol("SELECT c.name
			FROM syscolumns c
			LEFT JOIN sysobjects o ON c.id = o.id
			WHERE o.name = '$table'");
			if (PEAR::isError($columns)) {
			return $columns;
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$columns = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $columns);
			}
			return $columns;
			}

			// }}}
			// {{{ listTableIndexes()

			/**
			* list all indexes in a table
			*
			* @param string $table name of table that should be used in method
			*
			* @return mixed array of index names on success, a MDB2 error on failure
			* @access public
			*/
			function listTableIndexes($table)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$key_name = 'INDEX_NAME';
			$pk_name = 'PK_NAME';
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			if ($db->options['field_case'] == CASE_LOWER) {
			$key_name = strtolower($key_name);
			$pk_name = strtolower($pk_name);
			} else {
			$key_name = strtoupper($key_name);
			$pk_name = strtoupper($pk_name);
			}
			}
			$table = $db->quote($table, 'text');
			$query = "EXEC sp_statistics @table_name=$table";
			$indexes = $db->queryCol($query, 'text', $key_name);
			if (PEAR::isError($indexes)) {
			return $indexes;
			}
			$query = "EXEC sp_pkeys @table_name=$table";
			$pk_all = $db->queryCol($query, 'text', $pk_name);
			$result = array();
			foreach ($indexes as $index) {
			if (!in_array($index, $pk_all) && ($index = $this->_fixIndexName($index))) {
			$result[$index] = true;
			}
			}

			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_change_key_case($result, $db->options['field_case']);
			}
			return array_keys($result);
			}

			// }}}
			// {{{ listDatabases()

			/**
			* list all databases
			*
			* @return mixed array of database names on success, a MDB2 error on failure
			* @access public
			*/
			function listDatabases()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$result = $db->queryCol('SELECT name FROM sys.databases');
			if (PEAR::isError($result)) {
			return $result;
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ listUsers()

			/**
			* list all users
			*
			* @return mixed array of user names on success, a MDB2 error on failure
			* @access public
			*/
			function listUsers()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$result = $db->queryCol('SELECT DISTINCT loginame FROM master..sysprocesses');
			if (PEAR::isError($result) \|\| empty($result)) {
			return $result;
			}
			foreach (array_keys($result) as $k) {
			$result[$k] = trim($result[$k]);
			}
			return $result;
			}

			// }}}
			// {{{ listFunctions()

			/**
			* list all functions in the current database
			*
			* @return mixed array of function names on success, a MDB2 error on failure
			* @access public
			*/
			function listFunctions()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = "SELECT name
			FROM sysobjects
			WHERE objectproperty(id, N'IsMSShipped') = 0
			AND (objectproperty(id, N'IsTableFunction') = 1
			OR objectproperty(id, N'IsScalarFunction') = 1)";
			/*
			SELECT ROUTINE_NAME
			FROM INFORMATION_SCHEMA.ROUTINES
			WHERE ROUTINE_TYPE = 'FUNCTION'
			*/
			$result = $db->queryCol($query);
			if (PEAR::isError($result)) {
			return $result;
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ listTableTriggers()

			/**
			* list all triggers in the database that reference a given table
			*
			* @param string table for which all referenced triggers should be found
			*
			* @return mixed array of trigger names on success, otherwise, false which
			* could be a db error if the db is not instantiated or could
			* be the results of the error that occured during the
			* querying of the sysobject module.
			* @access public
			*/
			function listTableTriggers($table = null)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$table = $db->quote($table, 'text');
			$query = "SELECT o.name
			FROM sysobjects o
			WHERE xtype = 'TR'
			AND OBJECTPROPERTY(o.id, 'IsMSShipped') = 0";
			if (!is_null($table)) {
			$query .= " AND object_name(parent_obj) = $table";
			}

			$result = $db->queryCol($query);
			if (PEAR::isError($result)) {
			return $result;
			}

			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE &&
			$db->options['field_case'] == CASE_LOWER)
			{
			$result = array_map(($db->options['field_case'] == CASE_LOWER ?
			'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ listViews()

			/**
			* list all views in the current database
			*
			* @param string database, the current is default
			*
			* @return mixed array of view names on success, a MDB2 error on failure
			* @access public
			*/
			function listViews()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = "SELECT name
			FROM sysobjects
			WHERE xtype = 'V'";
			/*
			SELECT *
			FROM sysobjects
			WHERE objectproperty(id, N'IsMSShipped') = 0
			AND objectproperty(id, N'IsView') = 1
			*/

			$result = $db->queryCol($query);
			if (PEAR::isError($result)) {
			return $result;
			}

			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE &&
			$db->options['field_case'] == CASE_LOWER)
			{
			$result = array_map(($db->options['field_case'] == CASE_LOWER ?
			'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ dropIndex()

			/**
			* drop existing index
			*
			* @param string $table name of table that should be used in method
			* @param string $name name of the index to be dropped
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function dropIndex($table, $name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$table = $db->quoteIdentifier($table, true);
			$name = $db->quoteIdentifier($db->getIndexName($name), true);
			return $db->exec("DROP INDEX $table.$name");
			}

			// }}}
			// {{{ listTableConstraints()

			/**
			* list all constraints in a table
			*
			* @param string $table name of table that should be used in method
			*
			* @return mixed array of constraint names on success, a MDB2 error on failure
			* @access public
			*/
			function listTableConstraints($table)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}
			$table = $db->quoteIdentifier($table, true);

			$query = "SELECT c.constraint_name
			FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS c
			WHERE c.constraint_catalog = DB_NAME()
			AND c.table_name = '$table'";
			$constraints = $db->queryCol($query);
			if (PEAR::isError($constraints)) {
			return $constraints;
			}

			$result = array();
			foreach ($constraints as $constraint) {
			$constraint = $this->_fixIndexName($constraint);
			if (!empty($constraint)) {
			$result[$constraint] = true;
			}
			}

			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_change_key_case($result, $db->options['field_case']);
			}
			return array_keys($result);
			}

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

			/**
			* create sequence
			*
			* @param string $seq_name name of the sequence to be created
			* @param string $start start value of the sequence; default is 1
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createSequence($seq_name, $start = 1)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$sequence_name = $db->quoteIdentifier($db->getSequenceName($seq_name), true);
			$seqcol_name = $db->quoteIdentifier($db->options['seqcol_name'], true);
			$query = "CREATE TABLE $sequence_name ($seqcol_name " .
			"INT PRIMARY KEY CLUSTERED IDENTITY($start,1) NOT NULL)";

			$res = $db->exec($query);
			if (PEAR::isError($res)) {
			return $res;
			}

			$query = "SET IDENTITY_INSERT $sequence_name ON ".
			"INSERT INTO $sequence_name ($seqcol_name) VALUES ($start)";
			$res = $db->exec($query);

			if (!PEAR::isError($res)) {
			return MDB2_OK;
			}

			$result = $db->exec("DROP TABLE $sequence_name");
			if (PEAR::isError($result)) {
			return $db->raiseError($result, null, null,
			'could not drop inconsistent sequence table', __FUNCTION__);
			}

			return $db->raiseError($res, null, null,
			'could not create sequence table', __FUNCTION__);
			}

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

			/**
			* This function drops an existing sequence
			*
			* @param string $seq_name name of the sequence to be dropped
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function dropSequence($seq_name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$sequence_name = $db->quoteIdentifier($db->getSequenceName($seq_name), true);
			return $db->exec("DROP TABLE $sequence_name");
			}

			// }}}
			// {{{ listSequences()

			/**
			* list all sequences in the current database
			*
			* @return mixed array of sequence names on success, a MDB2 error on failure
			* @access public
			*/
			function listSequences()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = "SELECT name FROM sysobjects WHERE xtype = 'U'";
			$table_names = $db->queryCol($query);
			if (PEAR::isError($table_names)) {
			return $table_names;
			}
			$result = array();
			foreach ($table_names as $table_name) {
			if ($sqn = $this->_fixSequenceName($table_name, true)) {
			$result[] = $sqn;
			}
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ?
			'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			}

			// }}}
			?>