deferred class
	DB_EXPRESSION

General
	cluster: interface

Ancestors
	STRING_HDL

Queries
	ht: HASH_TABLE [ANY, STRING_8]
	ht_order: ARRAYED_LIST [STRING_8]
	is_mapped (key: STRING_8): BOOLEAN
	last_query: STRING_8
	mapped_value (key: STRING_8): ANY

Commands
	clear_all
	execute_query
	set_map_name (n: ANY; key: STRING_8)
	set_query (query: STRING_8)
	unset_map_name (key: STRING_8)