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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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{$IFDEF MSWINDOWS} |
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{$DEFINE WINDOWS} |
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{$ENDIF} |
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|
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{$IFDEF FPC} |
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{$mode delphi} |
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{$codepage UTF8} |
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{$interfaces COM} |
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{$ENDIF} |
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|
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interface |
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|
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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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|
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type |
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|
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{ TFB25ArrayMetaData } |
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|
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TFB25ArrayMetaData = class(TFBArrayMetaData,IArrayMetaData) |
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private |
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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: AnsiString); 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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|
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{ TFB25Array } |
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|
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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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|
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implementation |
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|
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uses FBAttachment, FB25ClientAPI; |
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|
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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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|
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{ TFB25ArrayMetaData } |
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|
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procedure TFB25ArrayMetaData.LoadMetaData(aAttachment: IAttachment; |
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aTransaction: ITransaction; relationName, columnName: AnsiString); |
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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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CharWidth: integer; |
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RelName: AnsiString; |
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ColName: AnsiString; |
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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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RelName := AnsiUpperCase(relationName); |
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ColName := AnsiUpperCase(columnName); |
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with Firebird25ClientAPI do |
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if isc_array_lookup_bounds(StatusVector,@(DBHandle),@(TRHandle), |
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PAnsiChar(RelName),PAnsiChar(ColName),@FArrayDesc) > 0 then |
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IBDatabaseError; |
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|
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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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FAttachment.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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if (FArrayDesc.array_desc_dtype in [blr_text,blr_cstring, blr_varying]) and |
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(FCharSetID = 0) then {This really shouldn't be necessary - but it is :(} |
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with aAttachment as TFBAttachment do |
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begin |
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if HasDefaultCharSet and FAttachment.CharSetWidth(CharSetID,CharWidth) then |
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FArrayDesc.array_desc_length := FArrayDesc.array_desc_length * CharWidth; |
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end; |
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end; |
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|
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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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|
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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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|
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{ TFB25Array } |
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|
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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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|
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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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|
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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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|
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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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|
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end. |
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|
