ibase.php

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        }
        $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,
            );
        }

        $errormsg = @ibase_errmsg();
        foreach ($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;
            $got_string = false;
        }

        if (!is_resource($id)) {
            return $this->ibaseRaiseError(DB_ERROR_NEED_MORE_DATA);
        }

        if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
            $case_func = 'strtolower';
        } else {
            $case_func = 'strval';
        }

        $count = @ibase_num_fields($id);
        $res   = array();

        if ($mode) {
            $res['num_fields'] = $count;
        }

        for ($i = 0; $i < $count; $i++) {
            $info = @ibase_field_info($id, $i);
            $res[$i] = array(
                'table' => $got_string ? $case_func($result) : '',
                'name'  => $case_func($info['name']),
                'type'  => $info['type'],
                'len'   => $info['length'],
                'flags' => ($got_string)
                            ? $this->_ibaseFieldFlags($info['name'], $result)
                            : '',
            );
            if ($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 ($got_string) {
            @ibase_free_result($id);
        }
        return $res;
    }

    // }}}
    // {{{ 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 ($type) {
            case 'tables':
                return 'SELECT DISTINCT R.RDB$RELATION_NAME FROM '
                       . 'RDB$RELATION_FIELDS R WHERE R.RDB$SYSTEM_FLAG=0';
            case 'views':
                return 'SELECT DISTINCT RDB$VIEW_NAME from RDB$VIEW_RELATIONS';
            case 'users':
                return 'SELECT DISTINCT RDB$USER FROM RDB$USER_PRIVILEGES';
            default:
                return null;
        }
    }

    // }}}

}

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 */

?>