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(*
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* IBX For Lazarus (Firebird Express)
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*
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* The contents of this file are subject to the Initial Developer's
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* Public License Version 1.0 (the "License"); you may not use this
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* file except in compliance with the License. You may obtain a copy
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* of the License here:
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*
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* http://www.firebirdsql.org/index.php?op=doc&id=idpl
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Initial Developer of the Original Code is Tony Whyman.
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*
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* The Original Code is (C) 2015 Tony Whyman, MWA Software
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* (http://www.mwasoftware.co.uk).
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*
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* All Rights Reserved.
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*
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* Contributor(s): ______________________________________.
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*
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*)
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unit IBUpdate;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, SysUtils, IBCustomDataSet, DB, IB, IBDatabase, IBExternals, FBMessages;
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type
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TOnApplyUpdates = procedure(Sender: TObject; UpdateKind: TUpdateKind; Params: ISQLParams) of object;
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{ TIBUpdate}
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TIBUpdate = class(TIBDataSetUpdateObject)
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private
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FDataSet: TIBCustomDataSet;
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FDummySQL: TStrings;
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FOnApplyUpdates: TOnApplyUpdates;
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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 Apply(UpdateKind: TUpdateKind; buff: PChar); override;
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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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property DataSet;
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published
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property OnApplyUpdates: TOnApplyUpdates read FOnApplyUpdates write FOnApplyUpdates;
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end;
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implementation
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uses variants;
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type
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{ TParamListIntf }
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TParamListIntf = class(TInterfacedObject,ISQLParams)
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private
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type TParamRec = record
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Name: string;
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Value: variant;
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Modified: boolean;
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end;
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private
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FDatabase: TIBDatabase;
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FModified: boolean;
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FParams: array of TParamRec;
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procedure SetParam(index: integer; aValue: variant);
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public
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constructor Create(aFields: TFields; aDatabase: TIBDatabase);
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destructor Destroy; override;
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property Database: TIBDatabase read FDatabase;
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public
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{ISQLParams}
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function getCount: integer;
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function getSQLParam(index: integer): ISQLParam;
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function ByName(Idx: AnsiString): ISQLParam ;
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function GetModified: Boolean;
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end;
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{ TParamIntf }
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TParamIntf = class(TInterfacedObject,ISQLParam)
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private
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FIndex: integer;
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FOwner: TParamListIntf;
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public
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constructor Create(aOwner: TParamListIntf; aIndex: integer);
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function GetIndex: integer;
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function GetSQLType: cardinal;
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function GetSQLTypeName: AnsiString;
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function getSubtype: integer;
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function getName: AnsiString;
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function getScale: integer;
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function getCharSetID: cardinal;
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function getCodePage: TSystemCodePage;
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function getIsNullable: boolean;
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function GetSize: cardinal;
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function GetAsBoolean: boolean;
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function GetAsCurrency: Currency;
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function GetAsInt64: Int64;
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function GetAsDateTime: TDateTime;
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function GetAsDouble: Double;
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function GetAsFloat: Float;
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function GetAsLong: Long;
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function GetAsPointer: Pointer;
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function GetAsQuad: TISC_QUAD;
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function GetAsShort: short;
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function GetAsString: AnsiString;
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function GetIsNull: boolean;
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function GetAsVariant: Variant;
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function GetAsBlob: IBlob;
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function GetAsArray: IArray;
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procedure Clear;
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function GetModified: boolean;
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procedure SetAsBoolean(AValue: boolean);
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procedure SetAsCurrency(aValue: Currency);
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procedure SetAsInt64(aValue: Int64);
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procedure SetAsDate(aValue: TDateTime);
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procedure SetAsLong(aValue: Long);
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procedure SetAsTime(aValue: TDateTime);
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procedure SetAsDateTime(aValue: TDateTime);
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procedure SetAsDouble(aValue: Double);
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procedure SetAsFloat(aValue: Float);
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procedure SetAsPointer(aValue: Pointer);
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procedure SetAsShort(aValue: Short);
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procedure SetAsString(aValue: AnsiString);
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procedure SetAsVariant(aValue: Variant);
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procedure SetIsNull(aValue: Boolean);
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procedure SetAsBlob(aValue: IBlob);
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procedure SetAsArray(anArray: IArray);
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procedure SetAsQuad(aValue: TISC_QUAD);
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procedure SetCharSetID(aValue: cardinal);
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end;
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{ TParamIntf }
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constructor TParamIntf.Create(aOwner: TParamListIntf; aIndex: integer);
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begin
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FOwner := aOwner;
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FIndex := aIndex;
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end;
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function TParamIntf.GetIndex: integer;
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begin
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Result := Findex;
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end;
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function TParamIntf.GetSQLType: cardinal;
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begin
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IBError(ibxeNotSupported,[]);
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end;
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function TParamIntf.GetSQLTypeName: AnsiString;
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begin
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IBError(ibxeNotSupported,[]);
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end;
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function TParamIntf.getSubtype: integer;
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begin
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IBError(ibxeNotSupported,[]);
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end;
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function TParamIntf.getName: AnsiString;
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begin
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Result := FOwner.FParams[FIndex].Name;
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end;
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function TParamIntf.getScale: integer;
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begin
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IBError(ibxeNotSupported,[]);
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end;
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function TParamIntf.getCharSetID: cardinal;
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var id: integer;
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begin
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FOwner.Database.Attachment.CodePage2CharSetID(StringCodePage(FOwner.FParams[FIndex].Value),id);
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Result := id;
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end;
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function TParamIntf.getCodePage: TSystemCodePage;
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begin
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Result := StringCodePage(FOwner.FParams[FIndex].Value);
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end;
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function TParamIntf.getIsNullable: boolean;
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begin
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Result := true;
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end;
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function TParamIntf.GetSize: cardinal;
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begin
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IBError(ibxeNotSupported,[]);
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end;
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function TParamIntf.GetAsBoolean: boolean;
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begin
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Result := FOwner.FParams[FIndex].Value;
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end;
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function TParamIntf.GetAsCurrency: Currency;
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begin
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Result := FOwner.FParams[FIndex].Value;
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end;
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function TParamIntf.GetAsInt64: Int64;
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begin
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Result := FOwner.FParams[FIndex].Value;
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end;
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function TParamIntf.GetAsDateTime: TDateTime;
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begin
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Result := FOwner.FParams[FIndex].Value;
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end;
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function TParamIntf.GetAsDouble: Double;
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begin
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Result := FOwner.FParams[FIndex].Value;
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end;
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function TParamIntf.GetAsFloat: Float;
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begin
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Result := FOwner.FParams[FIndex].Value;
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end;
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function TParamIntf.GetAsLong: Long;
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begin
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Result := FOwner.FParams[FIndex].Value;
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end;
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function TParamIntf.GetAsPointer: Pointer;
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begin
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IBError(ibxeNotSupported,[]);
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end;
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function TParamIntf.GetAsQuad: TISC_QUAD;
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begin
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IBError(ibxeNotSupported,[]);
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end;
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function TParamIntf.GetAsShort: short;
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begin
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Result := FOwner.FParams[FIndex].Value;
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end;
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function TParamIntf.GetAsString: AnsiString;
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var v: variant;
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begin
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v := FOwner.FParams[FIndex].Value;
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Case varType(v) of
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varEmpty,
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varNull:
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Result := '';
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varShortInt,
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varSmallint,
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varInteger,
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varInt64,
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varByte,
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varWord,
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varDecimal,
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varLongWord,
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varQWord,
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varSingle:
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Result := IntToStr(v);
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varCurrency,
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varDouble:
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Result := FloatToStr(v);
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varDate:
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Result := DateTimeToStr(v);
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varStrArg,
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varString:
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Result := v;
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varBoolean:
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if v then
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Result := 'true'
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else
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Result := 'false';
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varVariant:
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Result := v;
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else
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Result := v;
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end;
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end;
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function TParamIntf.GetIsNull: boolean;
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begin
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Result := VarIsNull(FOwner.FParams[FIndex].Value);
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end;
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function TParamIntf.GetAsVariant: Variant;
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begin
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Result := FOwner.FParams[FIndex].Value;
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end;
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function TParamIntf.GetAsBlob: IBlob;
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begin
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IBError(ibxeNotSupported,[]);
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end;
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function TParamIntf.GetAsArray: IArray;
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begin
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IBError(ibxeNotSupported,[]);
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end;
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procedure TParamIntf.Clear;
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begin
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FOwner.SetParam(FIndex,NULL);
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end;
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function TParamIntf.GetModified: boolean;
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begin
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Result := FOwner.FParams[FIndex].Modified;
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end;
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procedure TParamIntf.SetAsBoolean(AValue: boolean);
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begin
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FOwner.SetParam(FIndex,AValue);
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end;
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procedure TParamIntf.SetAsCurrency(aValue: Currency);
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begin
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FOwner.SetParam(FIndex,AValue);
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end;
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procedure TParamIntf.SetAsInt64(aValue: Int64);
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begin
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FOwner.SetParam(FIndex,AValue);
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end;
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procedure TParamIntf.SetAsDate(aValue: TDateTime);
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begin
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FOwner.SetParam(FIndex,AValue);
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end;
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procedure TParamIntf.SetAsLong(aValue: Long);
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begin
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FOwner.SetParam(FIndex,AValue);
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end;
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procedure TParamIntf.SetAsTime(aValue: TDateTime);
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begin
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FOwner.SetParam(FIndex,AValue);
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end;
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procedure TParamIntf.SetAsDateTime(aValue: TDateTime);
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begin
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FOwner.SetParam(FIndex,AValue);
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end;
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procedure TParamIntf.SetAsDouble(aValue: Double);
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begin
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FOwner.SetParam(FIndex,AValue);
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end;
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procedure TParamIntf.SetAsFloat(aValue: Float);
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begin
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FOwner.SetParam(FIndex,AValue);
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end;
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procedure TParamIntf.SetAsPointer(aValue: Pointer);
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begin
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IBError(ibxeNotSupported,[]);
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end;
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procedure TParamIntf.SetAsShort(aValue: Short);
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begin
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FOwner.SetParam(FIndex,AValue);
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end;
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procedure TParamIntf.SetAsString(aValue: AnsiString);
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begin
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FOwner.SetParam(FIndex,AValue);
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end;
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procedure TParamIntf.SetAsVariant(aValue: Variant);
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begin
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FOwner.SetParam(FIndex,AValue);
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end;
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procedure TParamIntf.SetIsNull(aValue: Boolean);
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begin
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if aValue then
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FOwner.SetParam(FIndex,NULL)
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end;
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procedure TParamIntf.SetAsBlob(aValue: IBlob);
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begin
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IBError(ibxeNotSupported,[]);
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end;
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procedure TParamIntf.SetAsArray(anArray: IArray);
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begin
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IBError(ibxeNotSupported,[]);
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end;
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procedure TParamIntf.SetAsQuad(aValue: TISC_QUAD);
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begin
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IBError(ibxeNotSupported,[]);
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end;
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procedure TParamIntf.SetCharSetID(aValue: cardinal);
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var s: RawByteString;
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codepage: TSystemCodePage;
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str: string;
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begin
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str := FOwner.FParams[FIndex].Value;
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s := str;
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if FOwner.Database.Attachment.CharSetID2CodePage(aValue,codepage) then
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SetCodePage(s,codepage,codepage <> cp_none);
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end;
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{ TParamListIntf }
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procedure TParamListIntf.SetParam(index: integer; aValue: variant);
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begin
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FParams[index].Value := aValue;
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FParams[index].Modified := true;
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FModified := true;
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end;
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constructor TParamListIntf.Create(aFields: TFields; aDatabase: TIBDatabase);
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var i,j: integer;
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begin
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inherited Create;
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FDatabase := aDatabase;
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SetLength(FParams,aFields.Count*2);
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j := 0;
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{set up both current and "OLD" parameters from Field Names}
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for i := 0 to aFields.Count - 1 do
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if aFields[i].FieldKind = fkData then
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begin
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FParams[j].Name := aFields[i].FieldName;
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FParams[j].Value := NULL;
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FParams[j].Modified := false;
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Inc(j);
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FParams[j].Name := 'OLD_' + aFields[i].FieldName;
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FParams[j].Value := NULL;
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FParams[j].Modified := false;
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Inc(j);
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end;
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SetLength(FParams,j);
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end;
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destructor TParamListIntf.Destroy;
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begin
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SetLength(FParams,0);
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inherited Destroy;
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end;
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function TParamListIntf.getCount: integer;
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begin
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Result := Length(FParams);
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end;
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function TParamListIntf.getSQLParam(index: integer): ISQLParam;
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begin
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if (index < 0) or (index >= getCount) then
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IBError(ibxeInvalidColumnIndex,[nil]);
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Result := TParamIntf.Create(self,index);
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end;
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function TParamListIntf.ByName(Idx: AnsiString): ISQLParam;
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var i: integer;
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begin
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Result := nil;
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for i := 0 to getCount - 1 do
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if CompareText(FParams[i].Name,Idx) = 0 then
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begin
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Result := getSQLParam(i);
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Exit;
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end;
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end;
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function TParamListIntf.GetModified: Boolean;
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begin
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Result := FModified;
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end;
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490 |
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{ TIBUpdate }
|
492 |
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function TIBUpdate.GetSQL(UpdateKind: TUpdateKind): TStrings;
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begin
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Result := FDummySQL; {non empty result}
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end;
|
497 |
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function TIBUpdate.GetDataSet: TIBCustomDataSet;
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begin
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Result := FDataSet;
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end;
|
502 |
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procedure TIBUpdate.SetDataSet(ADataSet: TIBCustomDataSet);
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begin
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FDataSet := ADataset;
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end;
|
507 |
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procedure TIBUpdate.Apply(UpdateKind: TUpdateKind; buff: PChar);
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var Params: ISQLParams;
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begin
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Params := TParamListIntf.Create(Dataset.Fields,(DataSet.Database as TIBDatabase));
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InternalSetParams(Params,buff);
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if assigned(FOnApplyUpdates) then
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OnApplyUpdates(self,UpdateKind,Params);
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end;
|
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constructor TIBUpdate.Create(AOwner: TComponent);
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begin
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inherited Create(AOwner);
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FDummySQL := TStringList.Create;
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FDummySQL.Text := '*';
|
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end;
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523 |
|
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destructor TIBUpdate.Destroy;
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begin
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if assigned(FDummySQL) then FDummySQL.Free;
|
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inherited Destroy;
|
528 |
end;
|
529 |
|
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end.
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531 |
|