File: SquirrelDump.mesa
Implemented by: SquirrelDumpImpl, SquirrelLoadImpl
Last edited by: John Maxwell on: June 3, 1982 9:36 am
Willie-Sue on: February 22, 1983 3:46 pm
Donahue on: January 20, 1983 9:58 am
Cattell, April 28, 1983 2:28 pm
Widom, June 8, 1984 9:08:37 am PDT
Butler on: June 27, 1984 9:54:56 am PDT
DIRECTORY
DB USING [Domain, Entity, Relation, Relship],
IO USING [STREAM],
Rope USING [ROPE];
SquirrelDump:
CEDAR
DEFINITIONS =
BEGIN OPEN DB, IO, Rope;
**************************************************
for gross dumping of the data base
**************************************************
DumpToFile:
PROC[ segment:
ROPE, fileName:
ROPE ←
NIL, dl:
LIST
OF Domain ←
NIL, rl:
LIST
OF Relation ←
NIL, complement:
BOOLEAN ←
FALSE, entityCentric:
BOOLEAN ←
FALSE];
dumps only the domains and relations given. If complement = TRUE, dumps everything but the domains and relations given. If entityCentric = TRUE, dumps entities with relships reffing them in first attribute
DumpAll:
PROC[segment:
ROPE, fileName:
ROPE ←
NIL] =
INLINE {DumpToFile[segment, fileName, NIL, NIL, TRUE]};
LoadFromFile:
PROC[dumpFile:
ROPE ←
NIL, DBFile:
ROPE ←
NIL];
Loads whatever is in the dumpFile into the DBFile; uses same dump format as DumpToFile. The segment name is given in the dumpFile; if the DBFile does not exist, it is created
**************************************************
for selective dumping of the data base
**************************************************
OpenFile: PROC[fileName: ROPE] RETURNS[STREAM];
CloseFile:
PROC[fileStream:
STREAM];
you may use a different type of stream if you choose
WriteSchema: PROC[s: STREAM, dl: LIST OF Domain, rl: LIST OF Relation];
WriteDomain: PROC[s: STREAM, d: Domain, refs: BOOL← FALSE]; -- writes entities in domain
WriteEntity: PROC[s: STREAM, e: Entity]; -- writes a particular entity
WriteRelation: PROC[s: STREAM, r: Relation]; -- writes all the relships of the relation
WriteRelship: PROC[s: STREAM, r: Relship]; -- writes a particular relship
EraseDomains: PROC[dl: LIST OF Domain];
EraseRelations: PROC[rl: LIST OF Relation];
END . . .