FireDACQuery FDQuery New

FDQuery

 FDQuery1->ChangeCount;也有UpdatesPending属性
 FDQuery1->ApplyUpdates()

ExecSQL('select * from t where id=:?',[100]);

 FDQuery1->Table->Rows[2].Free();
 FDQuery1->UpdateCursorPos();
 FDQuery1->Resync(TResyncMode());

 FDQuery1->FetchAll();

 FDQuery1->Open("select * from t")

 FDQuery1->Open("select * from t where id=?",[100]);

 FDQuery1->OpenOrExecute()

FDQuery.Constraints.Add.CustomConstraint := 'FIELD_NAME > 1';
FDQuery.UpdateConstraints;
FDQuery.Table.Constraints.Check(FDQuery.GetRow(), rsModified, ctAtEditEnd);

隐藏当前行

 FDQuery1->UpdateCursorPos();
 FDQuery1->GetRow()->Free();
 FDQuery1->Resync(TResyncMode());
 FDQuery1->UpdateCursorPos();

增强的Locate功能LocateEx、LookupEx函数

lxoCheckOnly  If included, then LocateEx does not:

Change the current position. Fire BeforeScroll / AfterScroll events. Finish editing mode.  

 

FDQuery1.Data;

FDMemTable2.Data := FDQuery1.Data;

Delta

ADMemTable1.FilterChanges := [rtModified, rtInserted, rtDeleted];
ADMemTable1.Data := ADQuery1.Delta;

 

FilteredData

Represents the currently visible dataset data.

 

FDQuery1.SavePoint 还原点

var
  iSavePoint: Integer;
....
  // remember changes log state
  iSavePoint := FDMemTable1.SavePoint;
  try
    FDMemTable1.AppendRecord(....);
    FDMemTable1.AppendRecord(....);
    FDMemTable1.AppendRecord(....);
    ...
    FDMemTable1.Delete;
    // mark changes as persistent and clear change log
    FDMemTable1.CommitUpdates;
  except
    // in case of exception, undo changes
    FDMemTable1.SavePoint := iSavePoint;
    raise;
  end;

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