[Cyan]<CedarChest6.0>Cypress>DBModel.mesa!2

File: DBModel.mesa

Contents: Internal versions of DBModel procs, imported by DBImpl

and exported to DBModel.

Last edited by:

Cattell on: July 21, 1983 2:05 pm

Willie-sue, February 22, 1985 9:21:04 am PST

Donahue, March 10, 1986 8:48:42 am PST

Widom, September 5, 1985 8:50:29 pm PDT

DIRECTORY

DB,

DBCommon,

AlpineEnvironment,

Rope,

DBDefs;

DBModel: CEDAR DEFINITIONS

= BEGIN OPEN DBDefs, DBCommon;

Part 1: Initialization and transaction operations

initialized: READONLY BOOL;

This becomes TRUE when Initialize is called

Initialize: PROC [nCachePages: NAT, cacheFileName: ROPE];

OpenTransaction: PROC [segment: Segment, useTrans: TransactionHandle, eraseAfterOpen: BOOL ← FALSE] RETURNS[trans: TransactionHandle, schemaInvalid: BOOL];

MarkTransaction: PROC [trans: TransactionHandle];

AbortTransaction: PROC [trans: TransactionHandle];

CloseTransaction: PROC [trans: TransactionHandle];

MakeTransHandle: PROC[trans: DBCommon.Transaction] RETURNS[handle: TransactionHandle];

DeclareSegment: PROC [filePath: ROPE, segment: Segment, number: DBCommon.SegmentIndex, lock: AlpineEnvironment.LockOption, readonly: BOOL, createIfNotFound: BOOL, nPagesInitial, nPagesPerExtent: INT];

EraseSegment: PROC [segment: Segment, useTrans: TransactionHandle] RETURNS [trans: TransactionHandle];

GetSegmentInfo: PROC [segment: Segment] RETURNS [filePath: ROPE, readOnly: BOOL];

TransactionForSegment: PROC [segment: Segment] RETURNS [trans: TransactionHandle];

CacheKey: PROC[segment: Segment] RETURNS[key: INT];

The current value of the Model level cache key (which is changed only when the cache must be flushed because it is possibly inconsistent with the database)

Part 2: Domain-definition and -interrogation operations

DeclareDomain: PROC [name: ROPE, segment: Segment] RETURNS [d: Domain];

LookupDomain: PROC[name: ROPE, segment: Segment] RETURNS[d: Domain];

DestroyDomain: PROC [d: Domain];

DomainsByName: PROC [segment: Segment, lowName, highName: ROPE, start: DBCommon.FirstLast] RETURNS[ds: DomainSet];

NextDomain: PROC [ds: DomainSet] RETURNS [Domain];

PrevDomain: PROC [ds: DomainSet] RETURNS [Domain];

ReleaseDomainSet: PROC [ds: DomainSet];

DeclareSubType: PROC [of, is: Domain];

DestroySubType: PROC [of, is: Domain];

SuperType: PROC [d: Domain] RETURNS[super: Domain];

SubTypes: PROC [d: Domain] RETURNS[subs: DomainSet];

TypeForDomain: PROC[d: Domain] RETURNS[type: TypeCode];

Part 3: Relation-definition and -interrogation operations

DeclareRelation: PROC [name: ROPE, segment: Segment, fields: DB.FieldSpec, keys: LIST OF Index] RETURNS[r: Relation];

LookupRelation: PROC[name: ROPE, segment: Segment] RETURNS[r: Relation];

DestroyRelation: PROC [r: Relation];

RelationsByName: PROC [segment: Segment, lowName, highName: ROPE, start: DBCommon.FirstLast] RETURNS[RelationSet];

NextRelation: PROC [rs: RelationSet] RETURNS [Relation];

PrevRelation: PROC [rs: RelationSet] RETURNS [Relation];

ReleaseRelationSet: PROC [rs: RelationSet];

Fields: PROC[r: Relation] RETURNS[fieldSpec: DB.FieldSpec];

NameToField: PROC[r: Relation, name: ROPE] RETURNS[exists: BOOL, pos: CARDINAL];

FieldCount: PROC[r: Relation] RETURNS[count: CARDINAL];

FieldInfo: PROC[r: Relation, pos: CARDINAL] RETURNS[field: DB.Field];

DeclareIndex: PROC [r: Relation, index: Index, isKey: BOOL ← FALSE, doCheck: BOOL ← TRUE];

DestroyIndex: PROC[r: Relation, index: Index];

Keys: PROC[r: Relation] RETURNS[keys: LIST OF Index];

Indices: PROC[r: Relation] RETURNS[indices: LIST OF Index];

Part 4: Primitive operations

DeclareEntity: PROC[d: Domain, name: ROPE] RETURNS [e: Entity];

LookupEntity: PROC[d: Domain, name: ROPE] RETURNS[e: Entity];

CreateRelship: PROC[r: Relation, init: ValueSequence] RETURNS[t: Relship];

LookupRelship: PROC[r: Relation, key: Index, val: ValueSequence] RETURNS[relship: Relship];

DestroyEntity: PROC[e: Entity];

DestroyRelship: PROC[t: Relship];

SetF: PROC[t: Relship, field: CARDINAL, v: Value];

GetF: PROC[t: Relship, field: CARDINAL] RETURNS [Value];

SetP: PROC[e: Entity, r: Relation, field: CARDINAL, v: Value];

GetP: PROC[e: Entity, r: Relation, field: CARDINAL] RETURNS[Value];

EntityInfo: PROC [e: Entity] RETURNS [name: ROPE, domain: Domain];

RelationOf: PROC [t: Relship] RETURNS [Relation];

DomainEq: PROC [d1, d2: Domain] RETURNS[BOOL];

RelationEq: PROC [r1, r2: Relation] RETURNS[BOOL];

AttributeEq: PROC [a1, a2: Attribute] RETURNS[BOOL];

NullDomain: PROC [d: Domain] RETURNS[BOOLEAN];

NullRelation: PROC [r: Relation] RETURNS[BOOLEAN];

NullAttribute: PROC [a: Attribute] RETURNS[BOOLEAN];

Part 5: Aggregate operations

RelationSubset: PROC [r: Relation, index: Index, constraint: Constraint, start: FirstLast] RETURNS [RelshipSet];

RelshipsForEntity: PROC [e: Entity] RETURNS [rs: RelshipSet];

RelshipsWithEntityField: PROC[r: Relation, field: CARDINAL, val: Entity] RETURNS[rs: RelshipSet];

NextRelship: PROC [rs: RelshipSet] RETURNS [rship: Relship];

PrevRelship: PROC [rs: RelshipSet] RETURNS [rship: Relship];

ReleaseRelshipSet: PROC [rs: RelshipSet];

DomainSubset: PROC [d: Domain, lowName, highName: ROPE, start: DBCommon.FirstLast] RETURNS [EntitySet];

NextEntity: PROC [es: EntitySet] RETURNS [Entity];

PrevEntity: PROC [es: EntitySet] RETURNS [Entity];

ReleaseEntitySet: PROC [es: EntitySet];

RelationsOf: PROC [d: Domain] RETURNS[rs: RelationSet];

END.