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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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|
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unit IBUpdateSQL; |
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|
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interface |
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|
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uses Windows, SysUtils, Graphics, Classes, Controls, Db, StdVCL, |
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IB, IBCustomDataSet, IBQuery; |
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|
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type |
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{ TIBUpdateSQL } |
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|
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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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|
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implementation |
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|
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{ TIBUpdateSQL } |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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end. |
