With transaction pattern (langage)
De Wiki1000
(Différences entre les versions)
(→withP long transaction do) |
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Ligne 125 : | Ligne 125 : | ||
<source lang="delphi"> | <source lang="delphi"> | ||
+ | // Long transaction with default batch size | ||
+ | var inst:WFClasseB; | ||
begin | begin | ||
+ | withP long(100) Transaction do | ||
+ | for var idx:=1 to 100 do | ||
+ | begin | ||
+ | inst := WFClasseB.Create; | ||
+ | inst.unCode := 'B'+inttostr(index); | ||
+ | inst.Caption := 'Objet B'+inttostr(index); | ||
+ | end; | ||
+ | end; | ||
+ | |||
+ | // Long transaction with a batch size of 100 | ||
+ | var inst:WFClasseB; | ||
+ | begin | ||
+ | withP long(100) Transaction do | ||
+ | for var idx:=1 to 100 do | ||
+ | begin | ||
+ | inst := WFClasseB.Create; | ||
+ | inst.unCode := 'B'+inttostr(index); | ||
+ | inst.Caption := 'Objet B'+inttostr(index); | ||
+ | end; | ||
end; | end; | ||
</source> | </source> |
Version du 16 septembre 2011 à 13:33
Le pattern transaction permet d'encapsuler une transaction.
Sommaire |
withP transaction do
Ce pattern gère une transaction.
Le code généré par ce pattern est le suivant :
begin // with transaction do // ClassManager.BeginTran; try // glbWorkerPool.BeginParallel; try h.RunAnonymous(f.sAEntry); finally glbWorkerPool.EndParallel; end; // ClassManager.Commit([]); except ClassManager.RollBack; raise; end; end;
Exemple d'utilisation :
begin // Create an instance withP transaction do begin inst := MyClass.Create; inst.Caption := 'A new instance'; end; end;
withP private transaction do
Ce pattern gère une transaction privée.
Le code généré par le pattern est le suivant :
begin // withP private transaction do // old := ClassManager.NewTransContext; try ClassManager.BeginTran; try glbWorkerPool.BeginParallel; try h.RunAnonymous(f.sAEntry); finally glbWorkerPool.EndParallel; end; // ClassManager.Commit([]); except ClassManager.RollBack; raise; end; finally ClassManager.ActivateContext(old); end; end;
Exemple d'utilisation :
var inst:WFClasseB; begin withP private Transaction do for var idx:=1 to 100 do begin inst := WFClasseB.Create; inst.unCode := 'B'+inttostr(index); inst.Caption := 'Objet B'+inttostr(index); end; end;
withP long transaction do
Ce pattern gère une transaction longue.
Le code généré par ce pattern est le suivant :
begin // with long(batchSize) transaction do // ClassManager.BeginLongTran(batchSize); if batchSize>0 then begin ClassManager.CurrentTran.AutoBatch := True; ClassManager.CurrentTran.AutoBatchOptions := [coDontShowEngineError]; end; try {$IFDEF PARALLEL} glbWorkerPool.BeginParallel; try {$ENDIF} h.RunAnonymous(f.sAEntry); {$IFDEF PARALLEL} finally if not glbWorkerPool.EndParallel(E) then raise E; end; {$ENDIF} ClassManager.CommitLongTran([coDontShowEngineError,coNoConfirmDialog]); except ClassManager.RollBackLongTran; raise; end; end;
Exemple d'utilisation :
// Long transaction with default batch size var inst:WFClasseB; begin withP long(100) Transaction do for var idx:=1 to 100 do begin inst := WFClasseB.Create; inst.unCode := 'B'+inttostr(index); inst.Caption := 'Objet B'+inttostr(index); end; end; // Long transaction with a batch size of 100 var inst:WFClasseB; begin withP long(100) Transaction do for var idx:=1 to 100 do begin inst := WFClasseB.Create; inst.unCode := 'B'+inttostr(index); inst.Caption := 'Objet B'+inttostr(index); end; end;
withP private long transaction do
Ce pattern gère une transaction longue privé.
Le code généré par ce pattern est le suivant :
begin // with privateP long(batchSize) transaction do // old := ClassManager.NewTransContext; try ClassManager.BeginLongTran(batchSize); if batchSize>0 then begin ClassManager.CurrentTran.AutoBatch := True; ClassManager.CurrentTran.AutoBatchOptions := [coDontShowEngineError]; end; try {$IFDEF PARALLEL} glbWorkerPool.BeginParallel; try {$ENDIF} h.RunAnonymous(f.sAEntry); {$IFDEF PARALLEL} finally if not glbWorkerPool.EndParallel(E) then raise E; end; {$ENDIF} // ClassManager.CommitLongTran([coDontShowEngineError,coNoConfirmDialog]); except ClassManager.RollBackLongTran; raise; end; finally ClassManager.ActivateContext(old); end; end;
Exemple d'utilisation :
begin end;