lemon.external.gadfly.store.Relation0

Package lemon :: Package external :: Package gadfly :: Module store :: Class Relation0

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Class Relation0

Known Subclasses:: View

quick and dirty in core relation representation.
  self.tuples contains tuples or 0 if erased.
tuples must not move (to preserve indices)
unless indices regenerate.

Method Summary
	`__init__(self, attribute_names, tuples, filter)`
	`__repr__(self)`
	`add_index(self, index, recordtuples)` unset recordtuples if the index is initialized already.
	`add_tuples(self, tuples)`
	`attributes(self)`
	`choose_index(self, attributes)` choose an index including subset of attributes or None...
	`drop_index(self, index)`
	`drop_indices(self, db)`
	`dump(self, file)`
	`erase_tuples(self, seqnums)`
	`irepr(self)`
	`load(self, file)` checksum must succeed.
	`regenerate_indices(self)`
	`reset_tuples(self, tups, seqnums)`
	`rows(self, andseqnums)`
	`set_empty(self)`
	`shadow(self, otherrelation, log, name, inshadowdb)` return structural replica of otherrelation (as self)...
	`unshadow(self)` make self into a replacement for shadowed, return self.

Class Variable Summary
`int`	`is_view` = 0

Method Details

add_index(self, index, recordtuples=1)

unset recordtuples if the index is initialized already.

choose_index(self, attributes)

choose an index including subset of attributes or None

load(self, file)

checksum must succeed.

shadow(self, otherrelation, log, name, inshadowdb)

return structural replica of otherrelation (as self)

for non-updatable relation (eg, view) may return otherrelation

unshadow(self)

make self into a replacement for shadowed, return self.

Class Variable Details

is_view

Type:: int
Value:: 0

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