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<?php

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

/**

 * The PEAR DB driver for PHP's mssql extension

 * for interacting with Microsoft SQL Server databases

 *

 * PHP versions 4 and 5

 *

 * LICENSE: This source file is subject to version 3.0 of the PHP license

 * that is available through the world-wide-web at the following URI:

 * http://www.php.net/license/3_0.txt.  If you did not receive a copy of

 * the PHP License and are unable to obtain it through the web, please

 * send a note to license@php.net so we can mail you a copy immediately.

 *

 * @category   Database

 * @package    DB

 * @author     Sterling Hughes <sterling@php.net>

 * @author     Daniel Convissor <danielc@php.net>

 * @copyright  1997-2007 The PHP Group

 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0

 * @version    CVS: $Id: mssql.php,v 1.1 2008/07/07 18:00:39 mrflos Exp $

 * @link       http://pear.php.net/package/DB

 */

/**

 * Obtain the DB_common class so it can be extended from

 */

require_once 'DB/common.php';

/**

 * The methods PEAR DB uses to interact with PHP's mssql extension

 * for interacting with Microsoft SQL Server databases

 *

 * These methods overload the ones declared in DB_common.

 *

 * DB's mssql driver is only for Microsfoft SQL Server databases.

 *

 * If you're connecting to a Sybase database, you MUST specify "sybase"

 * as the "phptype" in the DSN.

 *

 * This class only works correctly if you have compiled PHP using

 * --with-mssql=[dir_to_FreeTDS].

 *

 * @category   Database

 * @package    DB

 * @author     Sterling Hughes <sterling@php.net>

 * @author     Daniel Convissor <danielc@php.net>

 * @copyright  1997-2007 The PHP Group

 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0

 * @version    Release: 1.7.14RC1

 * @link       http://pear.php.net/package/DB

 */

class DB_mssql extends DB_common

{

    // {{{ properties

    /**

     * The DB driver type (mysql, oci8, odbc, etc.)

     * @var string

     */

    var $phptype = 'mssql';

    /**

     * The database syntax variant to be used (db2, access, etc.), if any

     * @var string

     */

    var $dbsyntax = 'mssql';

    /**

     * The capabilities of this DB implementation

     *

     * The 'new_link' element contains the PHP version that first provided

     * new_link support for this DBMS.  Contains false if it's unsupported.

     *

     * Meaning of the 'limit' element:

     *   + 'emulate' = emulate with fetch row by number

     *   + 'alter'   = alter the query

     *   + false     = skip rows

     *

     * @var array

     */

    var $features = array(

        'limit'         => 'emulate',

        'new_link'      => false,

        'numrows'       => true,

        'pconnect'      => true,

        'prepare'       => false,

        'ssl'           => false,

        'transactions'  => true,

    );

    /**

     * A mapping of native error codes to DB error codes

     * @var array

     */

    // XXX Add here error codes ie: 'S100E' => DB_ERROR_SYNTAX

    var $errorcode_map = array(

        102   => DB_ERROR_SYNTAX,

        110   => DB_ERROR_VALUE_COUNT_ON_ROW,

        155   => DB_ERROR_NOSUCHFIELD,

        156   => DB_ERROR_SYNTAX,

        170   => DB_ERROR_SYNTAX,

        207   => DB_ERROR_NOSUCHFIELD,

        208   => DB_ERROR_NOSUCHTABLE,

        245   => DB_ERROR_INVALID_NUMBER,

        319   => DB_ERROR_SYNTAX,

        321   => DB_ERROR_NOSUCHFIELD,

        325   => DB_ERROR_SYNTAX,

        336   => DB_ERROR_SYNTAX,

        515   => DB_ERROR_CONSTRAINT_NOT_NULL,

        547   => DB_ERROR_CONSTRAINT,

        1018  => DB_ERROR_SYNTAX,

        1035  => DB_ERROR_SYNTAX,

        1913  => DB_ERROR_ALREADY_EXISTS,

        2209  => DB_ERROR_SYNTAX,

        2223  => DB_ERROR_SYNTAX,

        2248  => DB_ERROR_SYNTAX,

        2256  => DB_ERROR_SYNTAX,

        2257  => DB_ERROR_SYNTAX,

        2627  => DB_ERROR_CONSTRAINT,

        2714  => DB_ERROR_ALREADY_EXISTS,

        3607  => DB_ERROR_DIVZERO,

        3701  => DB_ERROR_NOSUCHTABLE,

        7630  => DB_ERROR_SYNTAX,

        8134  => DB_ERROR_DIVZERO,

        9303  => DB_ERROR_SYNTAX,

        9317  => DB_ERROR_SYNTAX,

        9318  => DB_ERROR_SYNTAX,

        9331  => DB_ERROR_SYNTAX,

        9332  => DB_ERROR_SYNTAX,

        15253 => DB_ERROR_SYNTAX,

    );

    /**

     * The raw database connection created by PHP

     * @var resource

     */

    var $connection;

    /**

     * The DSN information for connecting to a database

     * @var array

     */

    var $dsn = array();

    /**

     * Should data manipulation queries be committed automatically?

     * @var bool

     * @access private

     */

    var $autocommit = true;

    /**

     * The quantity of transactions begun

     *

     * {@internal  While this is private, it can't actually be designated

     * private in PHP 5 because it is directly accessed in the test suite.}}

     *

     * @var integer

     * @access private

     */

    var $transaction_opcount = 0;

    /**

     * The database specified in the DSN

     *

     * It's a fix to allow calls to different databases in the same script.

     *

     * @var string

     * @access private

     */

    var $_db = null;

    // }}}

    // {{{ constructor

    /**

     * This constructor calls <kbd>$this->DB_common()</kbd>

     *

     * @return void

     */

    function DB_mssql()

    {

        $this->DB_common();

    }

    // }}}

    // {{{ connect()

    /**

     * Connect to the database server, log in and open the database

     *

     * Don't call this method directly.  Use DB::connect() instead.

     *

     * @param array $dsn         the data source name

     * @param bool  $persistent  should the connection be persistent?

     *

     * @return int  DB_OK on success. A DB_Error object on failure.

     */

    function connect($dsn, $persistent = false)

    {

        if (!PEAR::loadExtension('mssql') && !PEAR::loadExtension('sybase')

            && !PEAR::loadExtension('sybase_ct'))

        {

            return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);

        }

        $this->dsn = $dsn;

        if ($dsn['dbsyntax']) {

            $this->dbsyntax = $dsn['dbsyntax'];

        }

        $params = array(

            $dsn['hostspec'] ? $dsn['hostspec'] : 'localhost',

            $dsn['username'] ? $dsn['username'] : null,

            $dsn['password'] ? $dsn['password'] : null,

        );

        if ($dsn['port']) {

            $params[0] .= ((substr(PHP_OS, 0, 3) == 'WIN') ? ',' : ':')

                        . $dsn['port'];

        }

        $connect_function = $persistent ? 'mssql_pconnect' : 'mssql_connect';

        $this->connection = @call_user_func_array($connect_function, $params);

        if (!$this->connection) {

            return $this->raiseError(DB_ERROR_CONNECT_FAILED,

                                     null, null, null,

                                     @mssql_get_last_message());

        }

        if ($dsn['database']) {

            if (!@mssql_select_db($dsn['database'], $this->connection)) {

                return $this->raiseError(DB_ERROR_NODBSELECTED,

                                         null, null, null,

                                         @mssql_get_last_message());

            }

            $this->_db = $dsn['database'];

        }

        return DB_OK;

    }

    // }}}

    // {{{ disconnect()

    /**

     * Disconnects from the database server

     *

     * @return bool  TRUE on success, FALSE on failure

     */

    function disconnect()

    {

        $ret = @mssql_close($this->connection);

        $this->connection = null;

        return $ret;

    }

    // }}}

    // {{{ simpleQuery()

    /**

     * Sends a query to the database server

     *

     * @param string  the SQL query string

     *

     * @return mixed  + a PHP result resrouce for successful SELECT queries

     *                + the DB_OK constant for other successful queries

     *                + a DB_Error object on failure

     */

    function simpleQuery($query)

    {

        $ismanip = $this->_checkManip($query);

        $this->last_query = $query;

        if (!@mssql_select_db($this->_db, $this->connection)) {

            return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);

        }

        $query = $this->modifyQuery($query);

        if (!$this->autocommit && $ismanip) {

            if ($this->transaction_opcount == 0) {

                $result = @mssql_query('BEGIN TRAN', $this->connection);

                if (!$result) {

                    return $this->mssqlRaiseError();

                }

            }

            $this->transaction_opcount++;

        }

        $result = @mssql_query($query, $this->connection);

        if (!$result) {

            return $this->mssqlRaiseError();

        }

        // Determine which queries that should return data, and which

        // should return an error code only.

        return $ismanip ? DB_OK : $result;

    }

    // }}}

    // {{{ nextResult()

    /**

     * Move the internal mssql result pointer to the next available result

     *

     * @param a valid fbsql result resource

     *

     * @access public

     *

     * @return true if a result is available otherwise return false

     */

    function nextResult($result)

    {

        return @mssql_next_result($result);

    }

    // }}}

    // {{{ fetchInto()

    /**

     * Places a row from the result set into the given array

     *

     * Formating of the array and the data therein are configurable.

     * See DB_result::fetchInto() for more information.

     *

     * This method is not meant to be called directly.  Use

     * DB_result::fetchInto() instead.  It can't be declared "protected"

     * because DB_result is a separate object.

     *

     * @param resource $result    the query result resource

     * @param array    $arr       the referenced array to put the data in

     * @param int      $fetchmode how the resulting array should be indexed

     * @param int      $rownum    the row number to fetch (0 = first row)

     *

     * @return mixed  DB_OK on success, NULL when the end of a result set is

     *                 reached or on failure

     *

     * @see DB_result::fetchInto()

     */

    function fetchInto($result, &$arr, $fetchmode, $rownum = null)

    {

        if ($rownum !== null) {

            if (!@mssql_data_seek($result, $rownum)) {

                return null;

            }

        }

        if ($fetchmode & DB_FETCHMODE_ASSOC) {

            $arr = @mssql_fetch_assoc($result);

            if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE && $arr) {

                $arr = array_change_key_case($arr, CASE_LOWER);

            }

        } else {

            $arr = @mssql_fetch_row($result);

        }

        if (!$arr) {

            return null;

        }

        if ($this->options['portability'] & DB_PORTABILITY_RTRIM) {

            $this->_rtrimArrayValues($arr);

        }

        if ($this->options['portability'] & DB_PORTABILITY_NULL_TO_EMPTY) {

            $this->_convertNullArrayValuesToEmpty($arr);

        }

        return DB_OK;

    }

    // }}}

    // {{{ freeResult()

    /**

     * Deletes the result set and frees the memory occupied by the result set

     *

     * This method is not meant to be called directly.  Use

     * DB_result::free() instead.  It can't be declared "protected"

     * because DB_result is a separate object.

     *

     * @param resource $result  PHP's query result resource

     *

     * @return bool  TRUE on success, FALSE if $result is invalid

     *

     * @see DB_result::free()

     */

    function freeResult($result)

    {

        return is_resource($result) ? mssql_free_result($result) : false;

    }

    // }}}

    // {{{ numCols()

    /**

     * Gets the number of columns in a result set

     *

     * This method is not meant to be called directly.  Use

     * DB_result::numCols() instead.  It can't be declared "protected"

     * because DB_result is a separate object.

     *

     * @param resource $result  PHP's query result resource

     *

     * @return int  the number of columns.  A DB_Error object on failure.

     *

     * @see DB_result::numCols()

     */

    function numCols($result)

    {

        $cols = @mssql_num_fields($result);

        if (!$cols) {

            return $this->mssqlRaiseError();

        }

        return $cols;

    }

    // }}}

    // {{{ numRows()

    /**

     * Gets the number of rows in a result set

     *

     * This method is not meant to be called directly.  Use

     * DB_result::numRows() instead.  It can't be declared "protected"

     * because DB_result is a separate object.

     *

     * @param resource $result  PHP's query result resource

     *

     * @return int  the number of rows.  A DB_Error object on failure.

     *

     * @see DB_result::numRows()

     */

    function numRows($result)

    {

        $rows = @mssql_num_rows($result);

        if ($rows === false) {

            return $this->mssqlRaiseError();

        }

        return $rows;

    }

    // }}}

    // {{{ autoCommit()

    /**

     * Enables or disables automatic commits

     *

     * @param bool $onoff  true turns it on, false turns it off

     *

     * @return int  DB_OK on success.  A DB_Error object if the driver

     *               doesn't support auto-committing transactions.

     */

    function autoCommit($onoff = false)

    {

        // XXX if $this->transaction_opcount > 0, we should probably

        // issue a warning here.

        $this->autocommit = $onoff ? true : false;

        return DB_OK;

    }

    // }}}

    // {{{ commit()

    /**

     * Commits the current transaction

     *

     * @return int  DB_OK on success.  A DB_Error object on failure.

     */

    function commit()

    {

        if ($this->transaction_opcount > 0) {

            if (!@mssql_select_db($this->_db, $this->connection)) {

                return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);

            }

            $result = @mssql_query('COMMIT TRAN', $this->connection);

            $this->transaction_opcount = 0;

            if (!$result) {

                return $this->mssqlRaiseError();

            }

        }

        return DB_OK;

    }

    // }}}

    // {{{ rollback()

    /**

     * Reverts the current transaction

     *

     * @return int  DB_OK on success.  A DB_Error object on failure.

     */

    function rollback()

    {

        if ($this->transaction_opcount > 0) {

            if (!@mssql_select_db($this->_db, $this->connection)) {

                return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);

            }

            $result = @mssql_query('ROLLBACK TRAN', $this->connection);

            $this->transaction_opcount = 0;

            if (!$result) {

                return $this->mssqlRaiseError();

            }

        }

        return DB_OK;

    }

    // }}}

    // {{{ affectedRows()

    /**

     * Determines the number of rows affected by a data maniuplation query

     *

     * 0 is returned for queries that don't manipulate data.

     *

     * @return int  the number of rows.  A DB_Error object on failure.

     */

    function affectedRows()

    {

        if ($this->_last_query_manip) {

            $res = @mssql_query('select @@rowcount', $this->connection);

            if (!$res) {

                return $this->mssqlRaiseError();

            }

            $ar = @mssql_fetch_row($res);

            if (!$ar) {

                $result = 0;

            } else {

                @mssql_free_result($res);

                $result = $ar[0];

            }

        } else {

            $result = 0;

        }

        return $result;

    }

    // }}}

    // {{{ nextId()

    /**

     * Returns the next free id in a sequence

     *

     * @param string  $seq_name  name of the sequence

     * @param boolean $ondemand  when true, the seqence is automatically

     *                            created if it does not exist

     *

     * @return int  the next id number in the sequence.

     *               A DB_Error object on failure.

     *

     * @see DB_common::nextID(), DB_common::getSequenceName(),

     *      DB_mssql::createSequence(), DB_mssql::dropSequence()

     */

    function nextId($seq_name, $ondemand = true)

    {

        $seqname = $this->getSequenceName($seq_name);

        if (!@mssql_select_db($this->_db, $this->connection)) {

            return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);

        }

        $repeat = 0;

        do {

            $this->pushErrorHandling(PEAR_ERROR_RETURN);

            $result = $this->query("INSERT INTO $seqname (vapor) VALUES (0)");

            $this->popErrorHandling();

            if ($ondemand && DB::isError($result) &&

                ($result->getCode() == DB_ERROR || $result->getCode() == DB_ERROR_NOSUCHTABLE))

            {

                $repeat = 1;

                $result = $this->createSequence($seq_name);

                if (DB::isError($result)) {

                    return $this->raiseError($result);

                }

            } elseif (!DB::isError($result)) {

                $result = $this->query("SELECT IDENT_CURRENT('$seqname')");

                if (DB::isError($result)) {

                    /* Fallback code for MS SQL Server 7.0, which doesn't have

                     * IDENT_CURRENT. This is *not* safe for concurrent

                     * requests, and really, if you're using it, you're in a

                     * world of hurt. Nevertheless, it's here to ensure BC. See

                     * bug #181 for the gory details.*/

                    $result = $this->query("SELECT @@IDENTITY FROM $seqname");

                }

                $repeat = 0;

            } else {

                $repeat = false;

            }

        } while ($repeat);

        if (DB::isError($result)) {

            return $this->raiseError($result);

        }

        $result = $result->fetchRow(DB_FETCHMODE_ORDERED);

        return $result[0];

    }

    /**

     * Creates a new sequence

     *

     * @param string $seq_name  name of the new sequence

     *

     * @return int  DB_OK on success.  A DB_Error object on failure.

     *

     * @see DB_common::createSequence(), DB_common::getSequenceName(),

     *      DB_mssql::nextID(), DB_mssql::dropSequence()

     */

    function createSequence($seq_name)

    {

        return $this->query('CREATE TABLE '

                            . $this->getSequenceName($seq_name)

                            . ' ([id] [int] IDENTITY (1, 1) NOT NULL,'

                            . ' [vapor] [int] NULL)');

    }

    // }}}

    // {{{ dropSequence()

    /**

     * Deletes a sequence

     *

     * @param string $seq_name  name of the sequence to be deleted

     *

     * @return int  DB_OK on success.  A DB_Error object on failure.

     *

     * @see DB_common::dropSequence(), DB_common::getSequenceName(),

     *      DB_mssql::nextID(), DB_mssql::createSequence()

     */

    function dropSequence($seq_name)

    {

        return $this->query('DROP TABLE ' . $this->getSequenceName($seq_name));

    }

    // }}}

    // {{{ quoteIdentifier()

    /**

     * Quotes a string so it can be safely used as a table or column name

     *

     * @param string $str  identifier name to be quoted

     *

     * @return string  quoted identifier string

     *

     * @see DB_common::quoteIdentifier()

     * @since Method available since Release 1.6.0

     */

    function quoteIdentifier($str)

    {

        return '[' . str_replace(']', ']]', $str) . ']';

    }

    // }}}

    // {{{ mssqlRaiseError()

    /**

     * Produces a DB_Error object regarding the current problem

     *

     * @param int $errno  if the error is being manually raised pass a

     *                     DB_ERROR* constant here.  If this isn't passed

     *                     the error information gathered from the DBMS.

     *

     * @return object  the DB_Error object

     *

     * @see DB_common::raiseError(),

     *      DB_mssql::errorNative(), DB_mssql::errorCode()

     */

    function mssqlRaiseError($code = null)

    {

        $message = @mssql_get_last_message();

        if (!$code) {

            $code = $this->errorNative();

        }

        return $this->raiseError($this->errorCode($code, $message),

                                 null, null, null, "$code - $message");

    }

    // }}}

    // {{{ errorNative()

    /**

     * Gets the DBMS' native error code produced by the last query

     *

     * @return int  the DBMS' error code

     */

    function errorNative()

    {

        $res = @mssql_query('select @@ERROR as ErrorCode', $this->connection);

        if (!$res) {

            return DB_ERROR;

        }

        $row = @mssql_fetch_row($res);

        return $row[0];

    }

    // }}}

    // {{{ errorCode()

    /**

     * Determines PEAR::DB error code from mssql's native codes.

     *

     * If <var>$nativecode</var> isn't known yet, it will be looked up.

     *

     * @param  mixed  $nativecode  mssql error code, if known

     * @return integer  an error number from a DB error constant

     * @see errorNative()

     */

    function errorCode($nativecode = null, $msg = '')

    {

        if (!$nativecode) {

            $nativecode = $this->errorNative();

        }

        if (isset($this->errorcode_map[$nativecode])) {

            if ($nativecode == 3701

                && preg_match('/Cannot drop the index/i', $msg))

            {

                return DB_ERROR_NOT_FOUND;

            }

            return $this->errorcode_map[$nativecode];

        } else {

            return DB_ERROR;

        }

    }

    // }}}

    // {{{ tableInfo()

    /**

     * Returns information about a table or a result set

     *

     * NOTE: only supports 'table' and 'flags' if <var>$result</var>

     * is a table name.

     *

     * @param object|string  $result  DB_result object from a query or a

     *                                 string containing the name of a table.

     *                                 While this also accepts a query result

     *                                 resource identifier, this behavior is

     *                                 deprecated.

     * @param int            $mode    a valid tableInfo mode

     *

     * @return array  an associative array with the information requested.

     *                 A DB_Error object on failure.

     *

     * @see DB_common::tableInfo()

     */

    function tableInfo($result, $mode = null)

    {

        if (is_string($result)) {

            /*

             * Probably received a table name.

             * Create a result resource identifier.

             */

            if (!@mssql_select_db($this->_db, $this->connection)) {

                return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);

            }

            $id = @mssql_query("SELECT * FROM $result WHERE 1=0",

                               $this->connection);

            $got_string = true;

        } elseif (isset($result->result)) {

            /*

             * Probably received a result object.

             * Extract the result resource identifier.

             */

            $id = $result->result;

            $got_string = false;

        } else {

            /*

             * Probably received a result resource identifier.

             * Copy it.

             * Deprecated.  Here for compatibility only.

             */

            $id = $result;

            $got_string = false;

        }

        if (!is_resource($id)) {

            return $this->mssqlRaiseError(DB_ERROR_NEED_MORE_DATA);

        }

        if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {

            $case_func = 'strtolower';

        } else {

            $case_func = 'strval';

        }

        $count = @mssql_num_fields($id);

        $res   = array();

        if ($mode) {

            $res['num_fields'] = $count;

        }

        for ($i = 0; $i < $count; $i++) {

            if ($got_string) {

                $flags = $this->_mssql_field_flags($result,

                        @mssql_field_name($id, $i));

                if (DB::isError($flags)) {

                    return $flags;

                }

            } else {

                $flags = '';

            }

            $res[$i] = array(

                'table' => $got_string ? $case_func($result) : '',

                'name'  => $case_func(@mssql_field_name($id, $i)),

                'type'  => @mssql_field_type($id, $i),

                'len'   => @mssql_field_length($id, $i),

                'flags' => $flags,

            );

            if ($mode & DB_TABLEINFO_ORDER) {

                $res['order'][$res[$i]['name']] = $i;

            }

            if ($mode & DB_TABLEINFO_ORDERTABLE) {

                $res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;

            }

        }

        // free the result only if we were called on a table

        if ($got_string) {

            @mssql_free_result($id);

        }

        return $res;

    }

    // }}}

    // {{{ _mssql_field_flags()

    /**

     * Get a column's flags

     *

     * Supports "not_null", "primary_key",

     * "auto_increment" (mssql identity), "timestamp" (mssql timestamp),

     * "unique_key" (mssql unique index, unique check or primary_key) and

     * "multiple_key" (multikey index)

     *

     * mssql timestamp is NOT similar to the mysql timestamp so this is maybe

     * not useful at all - is the behaviour of mysql_field_flags that primary

     * keys are alway unique? is the interpretation of multiple_key correct?

     *

     * @param string $table   the table name

     * @param string $column  the field name

     *

     * @return string  the flags

     *

     * @access private

     * @author Joern Barthel <j_barthel@web.de>

     */

    function _mssql_field_flags($table, $column)

    {

        static $tableName = null;

        static $flags = array();

        if ($table != $tableName) {

            $flags = array();

            $tableName = $table;

            // get unique and primary keys

            $res = $this->getAll("EXEC SP_HELPINDEX $table", DB_FETCHMODE_ASSOC);

            if (DB::isError($res)) {

                return $res;

            }

            foreach ($res as $val) {

                $keys = explode(', ', $val['index_keys']);

                if (sizeof($keys) > 1) {

                    foreach ($keys as $key) {

                        $this->_add_flag($flags[$key], 'multiple_key');

                    }

                }

                if (strpos($val['index_description'], 'primary key')) {

                    foreach ($keys as $key) {

                        $this->_add_flag($flags[$key], 'primary_key');

                    }

                } elseif (strpos($val['index_description'], 'unique')) {

                    foreach ($keys as $key) {

                        $this->_add_flag($flags[$key], 'unique_key');

                    }

                }

            }

            // get auto_increment, not_null and timestamp

            $res = $this->getAll("EXEC SP_COLUMNS $table", DB_FETCHMODE_ASSOC);

            if (DB::isError($res)) {

                return $res;

            }

            foreach ($res as $val) {

                $val = array_change_key_case($val, CASE_LOWER);

                if ($val['nullable'] == '0') {

                    $this->_add_flag($flags[$val['column_name']], 'not_null');

                }

                if (strpos($val['type_name'], 'identity')) {

                    $this->_add_flag($flags[$val['column_name']], 'auto_increment');

                }

                if (strpos($val['type_name'], 'timestamp')) {

                    $this->_add_flag($flags[$val['column_name']], 'timestamp');

                }

            }

        }

        if (array_key_exists($column, $flags)) {

            return(implode(' ', $flags[$column]));

        }

        return '';

    }

    // }}}

    // {{{ _add_flag()

    /**

     * Adds a string to the flags array if the flag is not yet in there

     * - if there is no flag present the array is created

     *

     * @param array  &$array  the reference to the flag-array

     * @param string $value   the flag value

     *

     * @return void

     *

     * @access private

     * @author Joern Barthel <j_barthel@web.de>

     */

    function _add_flag(&$array, $value)

    {

        if (!is_array($array)) {

            $array = array($value);

        } elseif (!in_array($value, $array)) {

            array_push($array, $value);

        }

    }

    // }}}

    // {{{ getSpecialQuery()

    /**

     * Obtains the query string needed for listing a given type of objects

     *

     * @param string $type  the kind of objects you want to retrieve

     *

     * @return string  the SQL query string or null if the driver doesn't

     *                  support the object type requested

     *

     * @access protected

     * @see DB_common::getListOf()

     */

    function getSpecialQuery($type)

    {

        switch ($type) {

            case 'tables':

                return "SELECT name FROM sysobjects WHERE type = 'U'"

                       . ' ORDER BY name';

            case 'views':

                return "SELECT name FROM sysobjects WHERE type = 'V'";

            default:

                return null;

        }

    }

    // }}}

}

/*

 * Local variables:

 * tab-width: 4

 * c-basic-offset: 4

 * End:

 */

?>