    class
    	DB_CONTROL

    General
    	cluster: interface
    	create: make

    Ancestors
    	DB_EXEC_USE
    	DB_STATUS_USE
    	NUMERIC_NULL_VALUE

    Queries
    	error_code: INTEGER_32
    	error_message: STRING_8
    	exhausted: BOOLEAN
    	immediate_execution: BOOLEAN
    	is_connected: BOOLEAN
    	is_ok: BOOLEAN
    	is_tracing: BOOLEAN
    	numeric_null_value: REAL_64
    	trace_output: FILE
    	transaction_count: INTEGER_32
    	warning_message: STRING_8

    Commands
    	begin
    	commit
    	connect
    	disconnect
    	raise_error
    	reset
    	rollback
    	set_immediate
    	set_numeric_null_value (a_value: REAL_64)
    	set_trace
    	unset_immediate
    	unset_trace