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Diffstat (limited to 'program/lib/MDB2/Driver/Manager/mssql.php')
| -rw-r--r-- | program/lib/MDB2/Driver/Manager/mssql.php | 815 | 
1 files changed, 815 insertions, 0 deletions
diff --git a/program/lib/MDB2/Driver/Manager/mssql.php b/program/lib/MDB2/Driver/Manager/mssql.php new file mode 100644 index 000000000..9cc66f3b7 --- /dev/null +++ b/program/lib/MDB2/Driver/Manager/mssql.php @@ -0,0 +1,815 @@ +<?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;
 +    }
 +
 +    // }}}
 +}
 +
 +// }}}
 +?>
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