Purpose: To provide an interface for customary parameters' types
used by DatabasePlatform to append parameter to DatabaseCall:
descendants of DatabasePlatform may create instances of implementers of this class
of this interface in customModifyInDatabaseCall method.
Purpose: To provide a base type for customary parameters' types
used for binding by DatabaseCall:
descendants of DatabasePlatform may create instances of descendants of this class
in customModifyInDatabaseCall method.
INTERNAL:
DatasourceAccessor is an abstract implementation
of the Accessor interface providing common functionality to the concrete database and EIS accessors.