sybase.php

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    // }}}
    // {{{ affectedRows()

    /**
     * Gets the number of rows affected by the data manipulation
     * query.  For other queries, this function returns 0.
     *
     * @return number of rows affected by the last query
     */
    function affectedRows()
    {
        if (DB::isManip($this->last_query)) {
            $result = @sybase_affected_rows($this->connection);
        } else {
            $result = 0;
        }
        return $result;
     }

    // }}}
    // {{{ nextId()

    /**
     * Returns the next free id in a sequence
     *
     * @param string  $seq_name  name of the sequence
     * @param boolean $ondemand  when true, the seqence is automatically
     *                           created if it does not exist
     *
     * @return int  the next id number in the sequence.  DB_Error if problem.
     *
     * @internal
     * @see DB_common::nextID()
     * @access public
     */
    function nextId($seq_name, $ondemand = true)
    {
        $seqname = $this->getSequenceName($seq_name);
        if (!@sybase_select_db($this->_db, $this->connection)) {
            return $this->sybaseRaiseError(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 @@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 $seq_name  name of the new sequence
     *
     * @return int  DB_OK on success.  A DB_Error object is returned if
     *              problems arise.
     *
     * @internal
     * @see DB_common::createSequence()
     * @access public
     */
    function createSequence($seq_name)
    {
        $seqname = $this->getSequenceName($seq_name);
        return $this->query("CREATE TABLE $seqname ".
                            '(id numeric(10,0) IDENTITY NOT NULL ,' .
                            'vapor int NULL)');
    }

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

    /**
     * Deletes a sequence
     *
     * @param string $seq_name  name of the sequence to be deleted
     *
     * @return int  DB_OK on success.  DB_Error if problems.
     *
     * @internal
     * @see DB_common::dropSequence()
     * @access public
     */
    function dropSequence($seq_name)
    {
        $seqname = $this->getSequenceName($seq_name);
        return $this->query("DROP TABLE $seqname");
    }

    // }}}
    // {{{ getSpecialQuery()

    /**
     * Returns the query needed to get some backend info
     * @param string $type What kind of info you want to retrieve
     * @return string The SQL query string
     */
    function getSpecialQuery($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;
        }
    }

    // }}}
    // {{{ autoCommit()

    /**
     * Enable/disable automatic commits
     */
    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()

    /**
     * Commit the current transaction.
     */
    function commit()
    {
        if ($this->transaction_opcount > 0) {
            if (!@sybase_select_db($this->_db, $this->connection)) {
                return $this->sybaseRaiseError(DB_ERROR_NODBSELECTED);
            }
            $result = @sybase_query('COMMIT', $this->connection);
            $this->transaction_opcount = 0;
            if (!$result) {
                return $this->sybaseRaiseError();
            }
        }
        return DB_OK;
    }

    // }}}
    // {{{ rollback()

    /**
     * Roll back (undo) the current transaction.
     */
    function rollback()
    {
        if ($this->transaction_opcount > 0) {
            if (!@sybase_select_db($this->_db, $this->connection)) {
                return $this->sybaseRaiseError(DB_ERROR_NODBSELECTED);
            }
            $result = @sybase_query('ROLLBACK', $this->connection);
            $this->transaction_opcount = 0;
            if (!$result) {
                return $this->sybaseRaiseError();
            }
        }
        return DB_OK;
    }

    // }}}
    // {{{ 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
     * @param int            $mode    a valid tableInfo mode
     * @return array  an associative array with the information requested
     *                or an error object if something is wrong
     * @access public
     * @internal
     * @since 1.6.0
     * @see DB_common::tableInfo()
     */
    function tableInfo($result, $mode = null)
    {
        if (isset($result->result)) {
            /*
             * Probably received a result object.
             * Extract the result resource identifier.
             */
            $id = $result->result;
            $got_string = false;
        } elseif (is_string($result)) {
            /*
             * Probably received a table name.
             * Create a result resource identifier.
             */
            if (!@sybase_select_db($this->_db, $this->connection)) {
                return $this->sybaseRaiseError(DB_ERROR_NODBSELECTED);
            }
            $id = @sybase_query("SELECT * FROM $result WHERE 1=0",
                                $this->connection);
            $got_string = true;
        } 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->sybaseRaiseError(DB_ERROR_NEED_MORE_DATA);
        }

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

        $count = @sybase_num_fields($id);

        // made this IF due to performance (one if is faster than $count if's)
        if (!$mode) {

            for ($i=0; $i<$count; $i++) {
                $f = @sybase_fetch_field($id, $i);

                // column_source is often blank
                if ($got_string) {
                    $res[$i]['table'] = $case_func($result);
                } else {
                    $res[$i]['table'] = $case_func($f->column_source);
                }
                $res[$i]['name']  = $case_func($f->name);
                $res[$i]['type']  = $f->type;
                $res[$i]['len']   = $f->max_length;
                if ($res[$i]['table']) {
                    $res[$i]['flags'] = $this->_sybase_field_flags(
                            $res[$i]['table'], $res[$i]['name']);
                } else {
                    $res[$i]['flags'] = '';
                }
            }

        } else {
            // get full info

            $res['num_fields'] = $count;

            for ($i=0; $i<$count; $i++) {
                $f = @sybase_fetch_field($id, $i);

                // column_source is often blank
                if ($got_string) {
                    $res[$i]['table'] = $case_func($result);
                } else {
                    $res[$i]['table'] = $case_func($f->column_source);
                }
                $res[$i]['name']  = $case_func($f->name);
                $res[$i]['type']  = $f->type;
                $res[$i]['len']   = $f->max_length;
                if ($res[$i]['table']) {
                    $res[$i]['flags'] = $this->_sybase_field_flags(
                            $res[$i]['table'], $res[$i]['name']);
                } else {
                    $res[$i]['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 ($got_string) {
            @sybase_free_result($id);
        }
        return $res;
    }

    // }}}
    // {{{ _sybase_field_flags()

    /**
     * Get the flags for a field.
     *
     * Currently supports:
     *  + <samp>unique_key</samp>    (unique index, unique check or primary_key)
     *  + <samp>multiple_key</samp>  (multi-key index)
     *
     * @param string  $table   table name
     * @param string  $column  field name
     * @return string  space delimited string of flags.  Empty string if none.
     * @access private
     */
    function _sybase_field_flags($table, $column)
    {
        static $tableName = null;
        static $flags = array();

        if ($table != $tableName) {
            $flags = array();
            $tableName = $table;

            // get unique/primary keys
            $res = $this->getAll("sp_helpindex $table", DB_FETCHMODE_ASSOC);

            if (!isset($res[0]['index_description'])) {
                return '';
            }

            foreach ($res as $val) {
                $keys = explode(', ', trim($val['index_keys']));

                if (sizeof($keys) > 1) {
                    foreach ($keys as $key) {
                        $this->_add_flag($flags[$key], 'multiple_key');
                    }
                }

                if (strpos($val['index_description'], 'unique')) {
                    foreach ($keys as $key) {
                        $this->_add_flag($flags[$key], 'unique_key');
                    }
                }
            }

        }

        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  reference of flags array to add a value to
     * @param mixed  $value  value to add to the flag array
     * @access private
     */
    function _add_flag(&$array, $value)
    {
        if (!is_array($array)) {
            $array = array($value);
        } elseif (!in_array($value, $array)) {
            array_push($array, $value);
        }
    }

    // }}}
    // {{{ quoteIdentifier()

    /**
     * Quote a string so it can be safely used as a table / column name
     *
     * Quoting style depends on which database driver is being used.
     *
     * @param string $str  identifier name to be quoted
     *
     * @return string  quoted identifier string
     *
     * @since 1.6.0
     * @access public
     */
    function quoteIdentifier($str)
    {
        return '[' . str_replace(']', ']]', $str) . ']';
    }

    // }}}

}

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

?>