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<?php

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

/**

 * The PEAR DB driver for PHP's interbase extension

 * for interacting with Interbase and Firebird databases

 *

 * While this class works with PHP 4, PHP's InterBase extension is

 * unstable in PHP 4.  Use PHP 5.

 *

 * 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: ibase.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 interbase extension

 * for interacting with Interbase and Firebird databases

 *

 * These methods overload the ones declared in DB_common.

 *

 * While this class works with PHP 4, PHP's InterBase extension is

 * unstable in PHP 4.  Use PHP 5.

 *

 * NOTICE:  limitQuery() only works for Firebird.

 *

 * @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

 * @since      Class became stable in Release 1.7.0

 */

class DB_ibase extends DB_common

{

    // {{{ properties

    /**

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

     * @var string

     */

    var $phptype = 'ibase';

    /**

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

     * @var string

     */

    var $dbsyntax = 'ibase';

    /**

     * 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

     *

     * NOTE: only firebird supports limit.

     *

     * @var array

     */

    var $features = array(

        'limit'         => false,

        'new_link'      => false,

        'numrows'       => 'emulate',

        'pconnect'      => true,

        'prepare'       => true,

        'ssl'           => false,

        'transactions'  => true,

    );

    /**

     * A mapping of native error codes to DB error codes

     * @var array

     */

    var $errorcode_map = array(

        -104 => DB_ERROR_SYNTAX,

        -150 => DB_ERROR_ACCESS_VIOLATION,

        -151 => DB_ERROR_ACCESS_VIOLATION,

        -155 => DB_ERROR_NOSUCHTABLE,

        -157 => DB_ERROR_NOSUCHFIELD,

        -158 => DB_ERROR_VALUE_COUNT_ON_ROW,

        -170 => DB_ERROR_MISMATCH,

        -171 => DB_ERROR_MISMATCH,

        -172 => DB_ERROR_INVALID,

        // -204 =>  // Covers too many errors, need to use regex on msg

        -205 => DB_ERROR_NOSUCHFIELD,

        -206 => DB_ERROR_NOSUCHFIELD,

        -208 => DB_ERROR_INVALID,

        -219 => DB_ERROR_NOSUCHTABLE,

        -297 => DB_ERROR_CONSTRAINT,

        -303 => DB_ERROR_INVALID,

        -413 => DB_ERROR_INVALID_NUMBER,

        -530 => DB_ERROR_CONSTRAINT,

        -551 => DB_ERROR_ACCESS_VIOLATION,

        -552 => DB_ERROR_ACCESS_VIOLATION,

        // -607 =>  // Covers too many errors, need to use regex on msg

        -625 => DB_ERROR_CONSTRAINT_NOT_NULL,

        -803 => DB_ERROR_CONSTRAINT,

        -804 => DB_ERROR_VALUE_COUNT_ON_ROW,

        // -902 =>  // Covers too many errors, need to use regex on msg

        -904 => DB_ERROR_CONNECT_FAILED,

        -922 => DB_ERROR_NOSUCHDB,

        -923 => DB_ERROR_CONNECT_FAILED,

        -924 => DB_ERROR_CONNECT_FAILED

    );

    /**

     * The raw database connection created by PHP

     * @var resource

     */

    var $connection;

    /**

     * The DSN information for connecting to a database

     * @var array

     */

    var $dsn = array();

    /**

     * The number of rows affected by a data manipulation query

     * @var integer

     * @access private

     */

    var $affected = 0;

    /**

     * Should data manipulation queries be committed automatically?

     * @var bool

     * @access private

     */

    var $autocommit = true;

    /**

     * The prepared statement handle from the most recently executed statement

     *

     * {@internal  Mainly here because the InterBase/Firebird API is only

     * able to retrieve data from result sets if the statemnt handle is

     * still in scope.}}

     *

     * @var resource

     */

    var $last_stmt;

    /**

     * Is the given prepared statement a data manipulation query?

     * @var array

     * @access private

     */

    var $manip_query = array();

    // }}}

    // {{{ constructor

    /**

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

     *

     * @return void

     */

    function DB_ibase()

    {

        $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.

     *

     * PEAR DB's ibase driver supports the following extra DSN options:

     *   + buffers    The number of database buffers to allocate for the

     *                 server-side cache.

     *   + charset    The default character set for a database.

     *   + dialect    The default SQL dialect for any statement

     *                 executed within a connection.  Defaults to the

     *                 highest one supported by client libraries.

     *                 Functional only with InterBase 6 and up.

     *   + role       Functional only with InterBase 5 and up.

     *

     * @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('interbase')) {

            return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);

        }

        $this->dsn = $dsn;

        if ($dsn['dbsyntax']) {

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

        }

        if ($this->dbsyntax == 'firebird') {

            $this->features['limit'] = 'alter';

        }

        $params = array(

            $dsn['hostspec']

                    ? ($dsn['hostspec'] . ':' . $dsn['database'])

                    : $dsn['database'],

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

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

            isset($dsn['charset']) ? $dsn['charset'] : null,

            isset($dsn['buffers']) ? $dsn['buffers'] : null,

            isset($dsn['dialect']) ? $dsn['dialect'] : null,

            isset($dsn['role'])    ? $dsn['role'] : null,

        );

        $connect_function = $persistent ? 'ibase_pconnect' : 'ibase_connect';

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

        if (!$this->connection) {

            return $this->ibaseRaiseError(DB_ERROR_CONNECT_FAILED);

        }

        return DB_OK;

    }

    // }}}

    // {{{ disconnect()

    /**

     * Disconnects from the database server

     *

     * @return bool  TRUE on success, FALSE on failure

     */

    function disconnect()

    {

        $ret = @ibase_close($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;

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

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

        if (!$result) {

            return $this->ibaseRaiseError();

        }

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

            @ibase_commit($this->connection);

        }

        if ($ismanip) {

            $this->affected = $result;

            return DB_OK;

        } else {

            $this->affected = 0;

            return $result;

        }

    }

    // }}}

    // {{{ modifyLimitQuery()

    /**

     * Adds LIMIT clauses to a query string according to current DBMS standards

     *

     * Only works with Firebird.

     *

     * @param string $query   the query to modify

     * @param int    $from    the row to start to fetching (0 = the first row)

     * @param int    $count   the numbers of rows to fetch

     * @param mixed  $params  array, string or numeric data to be used in

     *                         execution of the statement.  Quantity of items

     *                         passed must match quantity of placeholders in

     *                         query:  meaning 1 placeholder for non-array

     *                         parameters or 1 placeholder per array element.

     *

     * @return string  the query string with LIMIT clauses added

     *

     * @access protected

     */

    function modifyLimitQuery($query, $from, $count, $params = array())

    {

        if ($this->dsn['dbsyntax'] == 'firebird') {

            $query = preg_replace('/^([\s(])*SELECT/i',

                                  "SELECT FIRST $count SKIP $from", $query);

        }

        return $query;

    }

    // }}}

    // {{{ nextResult()

    /**

     * Move the internal ibase 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 false;

    }

    // }}}

    // {{{ 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) {

            return $this->ibaseRaiseError(DB_ERROR_NOT_CAPABLE);

        }

        if ($fetchmode & DB_FETCHMODE_ASSOC) {

            if (function_exists('ibase_fetch_assoc')) {

                $arr = @ibase_fetch_assoc($result);

            } else {

                $arr = get_object_vars(ibase_fetch_object($result));

            }

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

                $arr = array_change_key_case($arr, CASE_LOWER);

            }

        } else {

            $arr = @ibase_fetch_row($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($result) ? ibase_free_result($result) : false;

    }

    // }}}

    // {{{ freeQuery()

    function freeQuery($query)

    {

        return is_resource($query) ? ibase_free_query($query) : false;

    }

    // }}}

    // {{{ 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 (is_integer($this->affected)) {

            return $this->affected;

        }

        return $this->ibaseRaiseError(DB_ERROR_NOT_CAPABLE);

    }

    // }}}

    // {{{ 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)

    {

        $cols = @ibase_num_fields($result);

        if (!$cols) {

            return $this->ibaseRaiseError();

        }

        return $cols;

    }

    // }}}

    // {{{ prepare()

    /**

     * Prepares a query for multiple execution with execute().

     *

     * prepare() requires a generic query as string like <code>

     *    INSERT INTO numbers VALUES (?, ?, ?)

     * </code>.  The <kbd>?</kbd> characters are placeholders.

     *

     * Three types of placeholders can be used:

     *   + <kbd>?</kbd>  a quoted scalar value, i.e. strings, integers

     *   + <kbd>!</kbd>  value is inserted 'as is'

     *   + <kbd>&</kbd>  requires a file name.  The file's contents get

     *                     inserted into the query (i.e. saving binary

     *                     data in a db)

     *

     * Use backslashes to escape placeholder characters if you don't want

     * them to be interpreted as placeholders.  Example: <code>

     *    "UPDATE foo SET col=? WHERE col='over \& under'"

     * </code>

     *

     * @param string $query query to be prepared

     * @return mixed DB statement resource on success. DB_Error on failure.

     */

    function prepare($query)

    {

        $tokens   = preg_split('/((?<!\\\)[&?!])/', $query, -1,

                               PREG_SPLIT_DELIM_CAPTURE);

        $token    = 0;

        $types    = array();

        $newquery = '';

        foreach ($tokens as $key => $val) {

            switch ($val) {

                case '?':

                    $types[$token++] = DB_PARAM_SCALAR;

                    break;

                case '&':

                    $types[$token++] = DB_PARAM_OPAQUE;

                    break;

                case '!':

                    $types[$token++] = DB_PARAM_MISC;

                    break;

                default:

                    $tokens[$key] = preg_replace('/\\\([&?!])/', "\\1", $val);

                    $newquery .= $tokens[$key] . '?';

            }

        }

        $newquery = substr($newquery, 0, -1);

        $this->last_query = $query;

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

        $stmt = @ibase_prepare($this->connection, $newquery);

        if ($stmt === false) {

            $stmt = $this->ibaseRaiseError();

        } else {

            $this->prepare_types[(int)$stmt] = $types;

            $this->manip_query[(int)$stmt]   = DB::isManip($query);

        }

        return $stmt;

    }

    // }}}

    // {{{ execute()

    /**

     * Executes a DB statement prepared with prepare().

     *

     * @param resource  $stmt  a DB statement resource returned from prepare()

     * @param mixed  $data  array, string or numeric data to be used in

     *                      execution of the statement.  Quantity of items

     *                      passed must match quantity of placeholders in

     *                      query:  meaning 1 for non-array items or the

     *                      quantity of elements in the array.

     * @return object  a new DB_Result or a DB_Error when fail

     * @see DB_ibase::prepare()

     * @access public

     */

    function &execute($stmt, $data = array())

    {

        $data = (array)$data;

        $this->last_parameters = $data;

        $types = $this->prepare_types[(int)$stmt];

        if (count($types) != count($data)) {

            $tmp = $this->raiseError(DB_ERROR_MISMATCH);

            return $tmp;

        }

        $i = 0;

        foreach ($data as $key => $value) {

            if ($types[$i] == DB_PARAM_MISC) {

                /*

                 * ibase doesn't seem to have the ability to pass a

                 * parameter along unchanged, so strip off quotes from start

                 * and end, plus turn two single quotes to one single quote,

                 * in order to avoid the quotes getting escaped by

                 * ibase and ending up in the database.

                 */

                $data[$key] = preg_replace("/^'(.*)'$/", "\\1", $data[$key]);

                $data[$key] = str_replace("''", "'", $data[$key]);

            } elseif ($types[$i] == DB_PARAM_OPAQUE) {

                $fp = @fopen($data[$key], 'rb');

                if (!$fp) {

                    $tmp = $this->raiseError(DB_ERROR_ACCESS_VIOLATION);

                    return $tmp;

                }

                $data[$key] = fread($fp, filesize($data[$key]));

                fclose($fp);

            }

            $i++;

        }

        array_unshift($data, $stmt);

        $res = call_user_func_array('ibase_execute', $data);

        if (!$res) {

            $tmp = $this->ibaseRaiseError();

            return $tmp;

        }

        /* XXX need this?

        if ($this->autocommit && $this->manip_query[(int)$stmt]) {

            @ibase_commit($this->connection);

        }*/

        $this->last_stmt = $stmt;

        if ($this->manip_query[(int)$stmt] || $this->_next_query_manip) {

            $this->_last_query_manip = true;

            $this->_next_query_manip = false;

            $tmp = DB_OK;

        } else {

            $this->_last_query_manip = false;

            $tmp = new DB_result($this, $res);

        }

        return $tmp;

    }

    /**

     * Frees the internal resources associated with a prepared query

     *

     * @param resource $stmt           the prepared statement's PHP resource

     * @param bool     $free_resource  should the PHP resource be freed too?

     *                                  Use false if you need to get data

     *                                  from the result set later.

     *

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

     *

     * @see DB_ibase::prepare()

     */

    function freePrepared($stmt, $free_resource = true)

    {

        if (!is_resource($stmt)) {

            return false;

        }

        if ($free_resource) {

            @ibase_free_query($stmt);

        }

        unset($this->prepare_tokens[(int)$stmt]);

        unset($this->prepare_types[(int)$stmt]);

        unset($this->manip_query[(int)$stmt]);

        return true;

    }

    // }}}

    // {{{ 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)

    {

        $this->autocommit = $onoff ? 1 : 0;

        return DB_OK;

    }

    // }}}

    // {{{ commit()

    /**

     * Commits the current transaction

     *

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

     */

    function commit()

    {

        return @ibase_commit($this->connection);

    }

    // }}}

    // {{{ rollback()

    /**

     * Reverts the current transaction

     *

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

     */

    function rollback()

    {

        return @ibase_rollback($this->connection);

    }

    // }}}

    // {{{ transactionInit()

    function transactionInit($trans_args = 0)

    {

        return $trans_args

                ? @ibase_trans($trans_args, $this->connection)

                : @ibase_trans();

    }

    // }}}

    // {{{ 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_ibase::createSequence(), DB_ibase::dropSequence()

     */

    function nextId($seq_name, $ondemand = true)

    {

        $sqn = strtoupper($this->getSequenceName($seq_name));

        $repeat = 0;

        do {

            $this->pushErrorHandling(PEAR_ERROR_RETURN);

            $result = $this->query("SELECT GEN_ID(${sqn}, 1) "

                                   . 'FROM RDB$GENERATORS '

                                   . "WHERE RDB\$GENERATOR_NAME='${sqn}'");

            $this->popErrorHandling();

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

                $repeat = 1;

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

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

                    return $result;

                }

            } else {

                $repeat = 0;

            }

        } while ($repeat);

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

            return $this->raiseError($result);

        }

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

        $result->free();

        return $arr[0];

    }

    // }}}

    // {{{ createSequence()

    /**

     * 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_ibase::nextID(), DB_ibase::dropSequence()

     */

    function createSequence($seq_name)

    {

        $sqn = strtoupper($this->getSequenceName($seq_name));

        $this->pushErrorHandling(PEAR_ERROR_RETURN);

        $result = $this->query("CREATE GENERATOR ${sqn}");

        $this->popErrorHandling();

        return $result;

    }

    // }}}

    // {{{ 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_ibase::nextID(), DB_ibase::createSequence()

     */

    function dropSequence($seq_name)

    {

        return $this->query('DELETE FROM RDB$GENERATORS '

                            . "WHERE RDB\$GENERATOR_NAME='"

                            . strtoupper($this->getSequenceName($seq_name))

                            . "'");

    }

    // }}}

    // {{{ _ibaseFieldFlags()

    /**

     * Get the column's flags

     *

     * Supports "primary_key", "unique_key", "not_null", "default",

     * "computed" and "blob".

     *

     * @param string $field_name  the name of the field

     * @param string $table_name  the name of the table

     *

     * @return string  the flags

     *

     * @access private

     */

    function _ibaseFieldFlags($field_name, $table_name)

    {

        $sql = 'SELECT R.RDB$CONSTRAINT_TYPE CTYPE'

               .' FROM RDB$INDEX_SEGMENTS I'

               .'  JOIN RDB$RELATION_CONSTRAINTS R ON I.RDB$INDEX_NAME=R.RDB$INDEX_NAME'

               .' WHERE I.RDB$FIELD_NAME=\'' . $field_name . '\''

               .'  AND UPPER(R.RDB$RELATION_NAME)=\'' . strtoupper($table_name) . '\'';

        $result = @ibase_query($this->connection, $sql);

        if (!$result) {

            return $this->ibaseRaiseError();

        }

        $flags = '';

        if ($obj = @ibase_fetch_object($result)) {

            @ibase_free_result($result);

            if (isset($obj->CTYPE)  && trim($obj->CTYPE) == 'PRIMARY KEY') {

                $flags .= 'primary_key ';

            }

            if (isset($obj->CTYPE)  && trim($obj->CTYPE) == 'UNIQUE') {

                $flags .= 'unique_key ';

            }

        }

        $sql = 'SELECT R.RDB$NULL_FLAG AS NFLAG,'

               .'  R.RDB$DEFAULT_SOURCE AS DSOURCE,'

               .'  F.RDB$FIELD_TYPE AS FTYPE,'

               .'  F.RDB$COMPUTED_SOURCE AS CSOURCE'

               .' FROM RDB$RELATION_FIELDS R '

               .'  JOIN RDB$FIELDS F ON R.RDB$FIELD_SOURCE=F.RDB$FIELD_NAME'

               .' WHERE UPPER(R.RDB$RELATION_NAME)=\'' . strtoupper($table_name) . '\''

               .'  AND R.RDB$FIELD_NAME=\'' . $field_name . '\'';

        $result = @ibase_query($this->connection, $sql);

        if (!$result) {

            return $this->ibaseRaiseError();

        }

        if ($obj = @ibase_fetch_object($result)) {

            @ibase_free_result($result);

            if (isset($obj->NFLAG)) {

                $flags .= 'not_null ';

            }

            if (isset($obj->DSOURCE)) {

                $flags .= 'default ';

            }

            if (isset($obj->CSOURCE)) {

                $flags .= 'computed ';

            }

            if (isset($obj->FTYPE)  && $obj->FTYPE == 261) {

                $flags .= 'blob ';

            }

        }

        return trim($flags);

    }

    // }}}

    // {{{ ibaseRaiseError()

    /**

     * 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_ibase::errorNative(), DB_ibase::errorCode()

     */

    function &ibaseRaiseError($errno = null)

    {

        if ($errno === null) {

            $errno = $this->errorCode($this->errorNative());

        }

        $tmp = $this->raiseError($errno, null, null, null, @ibase_errmsg());

        return $tmp;

    }

    // }}}

    // {{{ errorNative()

    /**

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

     *

     * @return int  the DBMS' error code.  NULL if there is no error code.

     *

     * @since Method available since Release 1.7.0

     */

    function errorNative()

    {

        if (function_exists('ibase_errcode')) {

            return @ibase_errcode();

        }

        if (preg_match('/^Dynamic SQL Error SQL error code = ([0-9-]+)/i',

                       @ibase_errmsg(), $m)) {

            return (int)$m[1];

        }

        return null;

    }

    // }}}

    // {{{ errorCode()

    /**

     * Maps native error codes to DB's portable ones

     *

     * @param int $nativecode  the error code returned by the DBMS

     *

     * @return int  the portable DB error code.  Return DB_ERROR if the

     *               current driver doesn't have a mapping for the

     *               $nativecode submitted.

     *

     * @since Method available since Release 1.7.0

     */

    function errorCode($nativecode = null)

    {

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

            return $this->errorcode_map[$nativecode];

        }

        static $error_regexps;

        if (!isset($error_regexps)) {

            $error_regexps = array(

                '/generator .* is not defined/'

                    => DB_ERROR_SYNTAX,  // for compat. w ibase_errcode()

                '/table.*(not exist|not found|unknown)/i'

                    => DB_ERROR_NOSUCHTABLE,

                '/table .* already exists/i'

                    => DB_ERROR_ALREADY_EXISTS,

                '/unsuccessful metadata update .* failed attempt to store duplicate value/i'

                    => DB_ERROR_ALREADY_EXISTS,

                '/unsuccessful metadata update .* not found/i'

                    => DB_ERROR_NOT_FOUND,

                '/validation error for column .* value "\*\*\* null/i'

                    => DB_ERROR_CONSTRAINT_NOT_NULL,

                '/violation of [\w ]+ constraint/i'

                    => DB_ERROR_CONSTRAINT,

                '/conversion error from string/i'

                    => DB_ERROR_INVALID_NUMBER,

                '/no permission for/i'

                    => DB_ERROR_ACCESS_VIOLATION,

                '/arithmetic exception, numeric overflow, or string truncation/i'

                    => DB_ERROR_INVALID,

                '/feature is not supported/i'

                    => DB_ERROR_NOT_CAPABLE,

            );

        }

        $errormsg = @ibase_errmsg();

        foreach ($error_regexps as $regexp => $code) {

            if (preg_match($regexp, $errormsg)) {

                return $code;

            }

        }

        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.

             */

            $id = @ibase_query($this->connection,

                               "SELECT * FROM $result WHERE 1=0");

            $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;