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{************************************************************************}
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{ }
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{ Borland Delphi Visual Component Library }
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{ InterBase Express core components }
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{ }
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{ Copyright (c) 1998-2000 Inprise Corporation }
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{ }
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{ InterBase Express is based in part on the product }
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{ Free IB Components, written by Gregory H. Deatz for }
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{ Hoagland, Longo, Moran, Dunst & Doukas Company. }
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{ Free IB Components is used under license. }
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{ }
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{ The contents of this file are subject to the InterBase }
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{ Public License Version 1.0 (the "License"); you may not }
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{ use this file except in compliance with the License. You }
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{ may obtain a copy of the License at http://www.Inprise.com/IPL.html }
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{ Software distributed under the License is distributed on }
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{ an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either }
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{ express or implied. See the License for the specific language }
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{ governing rights and limitations under the License. }
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{ The Original Code was created by InterBase Software Corporation }
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{ and its successors. }
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{ Portions created by Inprise Corporation are Copyright (C) Inprise }
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{ Corporation. All Rights Reserved. }
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{ Contributor(s): Jeff Overcash }
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{ }
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{************************************************************************}
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unit IBUpdateSQL;
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interface
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uses Windows, SysUtils, Graphics, Classes, Controls, Db, StdVCL,
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IB, IBCustomDataSet, IBQuery;
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type
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{ TIBUpdateSQL }
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TIBUpdateSQL = class(TIBDataSetUpdateObject)
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private
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FDataSet: TIBCustomDataSet;
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FQueries: array[TUpdateKind] of TIBQuery;
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FSQLText: array[TUpdateKind] of TStrings;
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function GetQuery(UpdateKind: TUpdateKind): TIBQuery;
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function GetSQLIndex(Index: Integer): TStrings;
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procedure SetSQL(UpdateKind: TUpdateKind; Value: TStrings);
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procedure SetSQLIndex(Index: Integer; Value: TStrings);
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protected
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function GetSQL(UpdateKind: TUpdateKind): TStrings; override;
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function GetDataSet: TIBCustomDataSet; override;
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procedure SetDataSet(ADataSet: TIBCustomDataSet); override;
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procedure SQLChanged(Sender: TObject);
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public
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constructor Create(AOwner: TComponent); override;
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destructor Destroy; override;
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procedure Apply(UpdateKind: TUpdateKind); override;
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procedure ExecSQL(UpdateKind: TUpdateKind);
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procedure SetParams(UpdateKind: TUpdateKind);
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property DataSet;
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property Query[UpdateKind: TUpdateKind]: TIBQuery read GetQuery;
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property SQL[UpdateKind: TUpdateKind]: TStrings read GetSQL write SetSQL;
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published
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property ModifySQL: TStrings index 0 read GetSQLIndex write SetSQLIndex;
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property InsertSQL: TStrings index 1 read GetSQLIndex write SetSQLIndex;
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property DeleteSQL: TStrings index 2 read GetSQLIndex write SetSQLIndex;
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end;
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implementation
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{ TIBUpdateSQL }
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constructor TIBUpdateSQL.Create(AOwner: TComponent);
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var
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UpdateKind: TUpdateKind;
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begin
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inherited Create(AOwner);
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for UpdateKind := Low(TUpdateKind) to High(TUpdateKind) do
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begin
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FSQLText[UpdateKind] := TStringList.Create;
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TStringList(FSQLText[UpdateKind]).OnChange := SQLChanged;
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end;
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end;
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destructor TIBUpdateSQL.Destroy;
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var
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UpdateKind: TUpdateKind;
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begin
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if Assigned(FDataSet) and (FDataSet.UpdateObject = Self) then
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FDataSet.UpdateObject := nil;
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for UpdateKind := Low(TUpdateKind) to High(TUpdateKind) do
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FSQLText[UpdateKind].Free;
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inherited Destroy;
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end;
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procedure TIBUpdateSQL.ExecSQL(UpdateKind: TUpdateKind);
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begin
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with Query[UpdateKind] do
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begin
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Prepare;
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ExecSQL;
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if RowsAffected <> 1 then IBError(ibxeUpdateFailed, [nil]);
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end;
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end;
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function TIBUpdateSQL.GetQuery(UpdateKind: TUpdateKind): TIBQuery;
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begin
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if not Assigned(FQueries[UpdateKind]) then
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begin
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FQueries[UpdateKind] := TIBQuery.Create(Self);
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FQueries[UpdateKind].SQL.Assign(FSQLText[UpdateKind]);
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if (FDataSet is TIBCustomDataSet) then
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begin
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FQueries[UpdateKind].Database := TIBCustomDataSet(FDataSet).DataBase;
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FQueries[UpdateKind].Transaction := TIBCustomDataSet(FDataSet).Transaction;
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end;
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end;
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Result := FQueries[UpdateKind];
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end;
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function TIBUpdateSQL.GetSQL(UpdateKind: TUpdateKind): TStrings;
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begin
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Result := FSQLText[UpdateKind];
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end;
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function TIBUpdateSQL.GetSQLIndex(Index: Integer): TStrings;
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begin
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Result := FSQLText[TUpdateKind(Index)];
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end;
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function TIBUpdateSQL.GetDataSet: TIBCustomDataSet;
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begin
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Result := FDataSet;
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end;
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procedure TIBUpdateSQL.SetDataSet(ADataSet: TIBCustomDataSet);
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begin
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FDataSet := ADataSet;
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end;
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procedure TIBUpdateSQL.SetSQL(UpdateKind: TUpdateKind; Value: TStrings);
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begin
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FSQLText[UpdateKind].Assign(Value);
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end;
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procedure TIBUpdateSQL.SetSQLIndex(Index: Integer; Value: TStrings);
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begin
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SetSQL(TUpdateKind(Index), Value);
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end;
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procedure TIBUpdateSQL.SQLChanged(Sender: TObject);
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var
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UpdateKind: TUpdateKind;
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begin
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for UpdateKind := Low(TUpdateKind) to High(TUpdateKind) do
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if Sender = FSQLText[UpdateKind] then
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begin
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if Assigned(FQueries[UpdateKind]) then
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begin
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FQueries[UpdateKind].Params.Clear;
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FQueries[UpdateKind].SQL.Assign(FSQLText[UpdateKind]);
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end;
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Break;
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end;
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end;
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procedure TIBUpdateSQL.SetParams(UpdateKind: TUpdateKind);
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var
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I: Integer;
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Old: Boolean;
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Param: TParam;
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PName: string;
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Field: TField;
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Value: Variant;
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begin
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if not Assigned(FDataSet) then Exit;
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with Query[UpdateKind] do
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begin
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for I := 0 to Params.Count - 1 do
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begin
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Param := Params[I];
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PName := Param.Name;
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Old := CompareText(Copy(PName, 1, 4), 'OLD_') = 0; {do not localize}
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if Old then
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System.Delete(PName, 1, 4);
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Field := FDataSet.FindField(PName);
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if not Assigned(Field) then
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Continue;
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if Old then
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Param.AssignFieldValue(Field, Field.OldValue) else
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begin
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Value := Field.NewValue;
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if VarIsEmpty(Value) then
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Value := Field.OldValue;
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Param.AssignFieldValue(Field, Value);
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end;
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end;
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end;
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end;
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procedure TIBUpdateSQL.Apply(UpdateKind: TUpdateKind);
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begin
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SetParams(UpdateKind);
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ExecSQL(UpdateKind);
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end;
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end.
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