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tony |
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(*
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* Firebird Interface (fbintf). The fbintf components provide a set of
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* Pascal language bindings for the Firebird API.
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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) 2016 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 FB25Array;
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{$IFDEF FPC}
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{$mode objfpc}{$H+}
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{$codepage UTF8}
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{$interfaces COM}
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{$ENDIF}
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interface
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uses
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Classes, SysUtils, IB, FBArray, IBHeader, FB25Statement, FB25Attachment, FBClientAPI,
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FB25Transaction;
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type
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{ TFB25ArrayMetaData }
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TFB25ArrayMetaData = class(TFBArrayMetaData,IArrayMetaData)
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private
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FCharSetID: integer;
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FCodePage: TSystemCodePage;
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protected
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procedure LoadMetaData(aAttachment: IAttachment; aTransaction: ITransaction;
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relationName, columnName: string); override;
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public
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function GetCharSetID: cardinal; override;
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function GetCodePage: TSystemCodePage; override;
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end;
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{ TFB25Array }
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TFB25Array = class(TFBArray,IArray)
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private
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FDBHandle: TISC_DB_HANDLE;
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FTRHandle: TISC_TR_HANDLE;
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protected
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procedure InternalGetSlice; override;
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procedure InternalPutSlice(Force: boolean); override;
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public
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constructor Create(aAttachment: TFB25Attachment; aTransaction: TFB25Transaction; aField: IArrayMetaData); overload;
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constructor Create(aAttachment: TFB25Attachment; aTransaction: TFB25Transaction; aField: IArrayMetaData; ArrayID: TISC_QUAD); overload;
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end;
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implementation
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uses FB25ClientAPI;
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const
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sGetArrayMetaData = 'Select F.RDB$CHARACTER_SET_ID '+
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'From RDB$FIELDS F JOIN RDB$RELATION_FIELDS RF '+
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'On F.RDB$FIELD_NAME = RF.RDB$FIELD_SOURCE '+
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'Where RF.RDB$RELATION_NAME = ? and RF.RDB$FIELD_NAME = ?';
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{ TFB25ArrayMetaData }
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procedure TFB25ArrayMetaData.LoadMetaData(aAttachment: IAttachment;
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aTransaction: ITransaction; relationName, columnName: string);
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var
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DBHandle: TISC_DB_HANDLE;
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TRHandle: TISC_TR_HANDLE;
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stmt: IStatement;
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begin
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DBHandle := (aAttachment as TFB25Attachment).Handle;
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TRHandle := (aTransaction as TFB25Transaction).Handle;
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with Firebird25ClientAPI do
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if isc_array_lookup_bounds(StatusVector,@(DBHandle),@(TRHandle),
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PChar(AnsiUpperCase(relationName)),PChar(AnsiUpperCase(columnName)),@FArrayDesc) > 0 then
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IBDatabaseError;
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if (GetSQLType = SQL_TEXT) or (GetSQLType = SQL_VARYING) then
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begin
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stmt := TFB25Statement.Create(aAttachment as TFB25Attachment,aTransaction,
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sGetArrayMetaData ,aAttachment.GetSQLDialect);
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with stmt do
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begin
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SQLParams[0].AsString := RelationName;
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SQLParams[1].AsString := ColumnName;
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with OpenCursor do
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if FetchNext then
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begin
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FCharSetID := Data[0].AsInteger;
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with (aAttachment as TFB25Attachment) do
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if (FCharSetID > 1) and HasDefaultCharSet then
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begin
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FCharSetID := CharSetID;
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FCodePage := CodePage;
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end
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else
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begin
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FCodePage := CP_NONE;
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FirebirdClientAPI.CharSetID2CodePage(FCharSetID,FCodePage);
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end;
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end;
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end;
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end;
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end;
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function TFB25ArrayMetaData.GetCharSetID: cardinal;
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begin
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Result := FCharSetID;
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end;
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function TFB25ArrayMetaData.GetCodePage: TSystemCodePage;
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begin
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Result := FCodePage;
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end;
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{ TFB25Array }
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procedure TFB25Array.InternalGetSlice;
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begin
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with Firebird25ClientAPI do
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Call(isc_array_get_slice(StatusVector,@(FDBHandle),@(FTRHandle),
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@FArrayID, GetArrayDesc,
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Pointer(FBuffer), @FBufSize));
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end;
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procedure TFB25Array.InternalPutSlice(Force: boolean);
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begin
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with Firebird25ClientAPI do
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if (isc_array_put_slice(StatusVector, @(FDBHandle),@(FTRHandle),
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@FArrayID, GetArrayDesc,
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Pointer(FBuffer),@FBufSize) > 0) and not Force then
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IBDatabaseError;
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SignalActivity;
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end;
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constructor TFB25Array.Create(aAttachment: TFB25Attachment;
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aTransaction: TFB25Transaction; aField: IArrayMetaData);
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begin
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inherited Create(aAttachment,aTransaction,aField);
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FDBHandle := aAttachment.Handle;
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FTRHandle := aTransaction.Handle;
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end;
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constructor TFB25Array.Create(aAttachment: TFB25Attachment;
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aTransaction: TFB25Transaction; aField: IArrayMetaData; ArrayID: TISC_QUAD);
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begin
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inherited Create(aAttachment,aTransaction,aField,ArrayID);
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FDBHandle := aAttachment.Handle;
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FTRHandle := aTransaction.Handle;
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end;
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end.
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