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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 FB25Attachment;
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{$IFDEF FPC}
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{$mode objfpc}{$H+}
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{$interfaces COM}
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{$ENDIF}
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interface
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uses
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Classes, SysUtils, IB, FBAttachment, FB25ClientAPI, IBHeader,
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FBParamBlock, FBOutputBlock, FBActivityMonitor;
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type
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{ TFB25Attachment }
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TFB25Attachment = class(TFBAttachment, IAttachment, IActivityMonitor)
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private
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FHandle: TISC_DB_HANDLE;
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protected
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procedure CheckHandle; override;
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public
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constructor Create(DatabaseName: string; aDPB: IDPB;
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RaiseExceptionOnConnectError: boolean);
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constructor CreateDatabase(DatabaseName: string; aDPB: IDPB; RaiseExceptionOnError: boolean);
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property Handle: TISC_DB_HANDLE read FHandle;
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public
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{IAttachment}
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procedure Connect;
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procedure Disconnect(Force: boolean=false); override;
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function IsConnected: boolean;
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procedure DropDatabase;
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function StartTransaction(TPB: array of byte; DefaultCompletion: TTransactionCompletion): ITransaction; override;
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function StartTransaction(TPB: ITPB; DefaultCompletion: TTransactionCompletion): ITransaction; override;
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procedure ExecImmediate(transaction: ITransaction; sql: string; aSQLDialect: integer); override;
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function Prepare(transaction: ITransaction; sql: string; aSQLDialect: integer): IStatement; override;
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function PrepareWithNamedParameters(transaction: ITransaction; sql: string;
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aSQLDialect: integer; GenerateParamNames: boolean=false): IStatement; override;
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function GetEventHandler(Events: TStrings): IEvents; override;
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function CreateBlob(transaction: ITransaction; RelationName, ColumnName: string; BPB: IBPB=nil): IBlob; overload;
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function CreateBlob(transaction: ITransaction; BlobMetaData: IBlobMetaData; BPB: IBPB=nil): IBlob; overload;
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function CreateBlob(transaction: ITransaction; SubType: integer; aCharSetID: cardinal=0; BPB: IBPB=nil): IBlob; overload;
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function OpenBlob(transaction: ITransaction; RelationName, ColumnName: string; BlobID: TISC_QUAD; BPB: IBPB=nil): IBlob; overload;
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function OpenBlob(transaction: ITransaction; BlobMetaData: IBlobMetaData; BlobID: TISC_QUAD; BPB: IBPB=nil): IBlob; override; overload;
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function OpenArray(transaction: ITransaction; RelationName, ColumnName: string;
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ArrayID: TISC_QUAD): IArray;
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function CreateArray(transaction: ITransaction; RelationName, ColumnName: string
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): IArray; overload;
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function CreateArray(transaction: ITransaction; ArrayMetaData: IArrayMetaData): IArray; overload;
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{Database Information}
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function GetBlobMetaData(Transaction: ITransaction; tableName, columnName: string): IBlobMetaData;
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function GetArrayMetaData(Transaction: ITransaction; tableName, columnName: string): IArrayMetaData;
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function GetDBInformation(Requests: array of byte): IDBInformation; overload;
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function GetDBInformation(Request: byte): IDBInformation; overload;
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end;
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implementation
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uses FB25Events,FB25Transaction, FBMessages, FB25Blob,
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FB25Statement, FB25Array;
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{ TFB25Attachment }
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procedure TFB25Attachment.CheckHandle;
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begin
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if FHandle = nil then
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IBError(ibxeDatabaseClosed,[nil]);
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end;
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constructor TFB25Attachment.Create(DatabaseName: string; aDPB: IDPB;
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RaiseExceptionOnConnectError: boolean);
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begin
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if aDPB = nil then
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begin
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if RaiseExceptionOnConnectError then
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IBError(ibxeNoDPB,[nil]);
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Exit;
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end;
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inherited Create(DatabaseName,aDPB,RaiseExceptionOnConnectError);
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Connect;
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end;
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constructor TFB25Attachment.CreateDatabase(DatabaseName: string; aDPB: IDPB;
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RaiseExceptionOnError: boolean);
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var sql: string;
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tr_handle: TISC_TR_HANDLE;
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begin
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inherited Create(DatabaseName,aDPB,RaiseExceptionOnError);
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sql := GenerateCreateDatabaseSQL(DatabaseName,aDPB);
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tr_handle := nil;
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with Firebird25ClientAPI do
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if (isc_dsql_execute_immediate(StatusVector, @FHandle, @tr_handle, 0, PChar(sql),
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SQLDialect, nil) > 0) and RaiseExceptionOnError then
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IBDataBaseError;
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if DPB <> nil then
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{Connect using known parameters}
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begin
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Disconnect;
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Connect;
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end;
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end;
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procedure TFB25Attachment.Connect;
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var Param: IDPBItem;
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begin
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FSQLDialect := 3;
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with Firebird25ClientAPI do
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if DPB = nil then
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begin
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if (isc_attach_database(StatusVector, Length(FDatabaseName),
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PChar(FDatabaseName), @FHandle, 0, nil) > 0) and FRaiseExceptionOnConnectError then
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IBDatabaseError;
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end
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else
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begin
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if (isc_attach_database(StatusVector, Length(FDatabaseName),
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PChar(FDatabaseName), @FHandle,
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(DPB as TDPB).getDataLength,
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(DPB as TDPB).getBuffer) > 0 ) and FRaiseExceptionOnConnectError then
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IBDatabaseError;
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if IsConnected then
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begin
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Param := DPB.Find(isc_dpb_set_db_SQL_dialect);
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if Param <> nil then
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FSQLDialect := Param.AsByte;
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Param := DPB.Find(isc_dpb_lc_ctype);
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FHasDefaultCharSet := (Param <> nil) and
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CharSetName2CharSetID(Param.AsString,FCharSetID) and
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CharSetID2CodePage(FCharSetID,FCodePage) and
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(FCharSetID > 1);
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end;
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end;
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end;
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procedure TFB25Attachment.Disconnect(Force: boolean);
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begin
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if FHandle = nil then
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Exit;
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EndAllTransactions;
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{Disconnect}
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with Firebird25ClientAPI do
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if (isc_detach_database(StatusVector, @FHandle) > 0) and not Force then
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IBDatabaseError;
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FHandle := nil;
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FHasDefaultCharSet := false;
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FCodePage := CP_NONE;
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FCharSetID := 0;
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end;
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function TFB25Attachment.IsConnected: boolean;
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begin
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Result := FHandle <> nil;
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end;
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procedure TFB25Attachment.DropDatabase;
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begin
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CheckHandle;
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EndAllTransactions;
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with Firebird25ClientAPI do
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if isc_drop_database(StatusVector, @FHandle) > 0 then
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IBDatabaseError;
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FHandle := nil;
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end;
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function TFB25Attachment.StartTransaction(TPB: array of byte;
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DefaultCompletion: TTransactionCompletion): ITransaction;
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begin
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CheckHandle;
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Result := TFB25Transaction.Create(self,TPB,DefaultCompletion);
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end;
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function TFB25Attachment.StartTransaction(TPB: ITPB;
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DefaultCompletion: TTransactionCompletion): ITransaction;
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begin
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CheckHandle;
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Result := TFB25Transaction.Create(self,TPB,DefaultCompletion);
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end;
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function TFB25Attachment.CreateBlob(transaction: ITransaction; RelationName,
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ColumnName: string; BPB: IBPB): IBlob;
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begin
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CheckHandle;
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Result := TFB25Blob.Create(self,transaction as TFB25transaction,
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TFB25BlobMetaData.Create(self,Transaction as TFB25Transaction,RelationName,ColumnName),BPB);
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end;
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function TFB25Attachment.CreateBlob(transaction: ITransaction;
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BlobMetaData: IBlobMetaData; BPB: IBPB): IBlob;
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begin
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CheckHandle;
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Result := TFB25Blob.Create(self,transaction as TFB25transaction,BlobMetaData,BPB);
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end;
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function TFB25Attachment.CreateBlob(transaction: ITransaction;
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SubType: integer; aCharSetID: cardinal; BPB: IBPB): IBlob;
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begin
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CheckHandle;
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Result := TFB25Blob.Create(self,transaction as TFB25transaction,SubType,aCharSetID,BPB);
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end;
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function TFB25Attachment.OpenBlob(transaction: ITransaction; RelationName,
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ColumnName: string; BlobID: TISC_QUAD; BPB: IBPB=nil): IBlob;
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begin
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CheckHandle;
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Result := TFB25Blob.Create(self,transaction as TFB25transaction,
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TFB25BlobMetaData.Create(self,Transaction as TFB25Transaction,RelationName,ColumnName),
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BlobID,BPB);
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end;
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function TFB25Attachment.OpenBlob(transaction: ITransaction;
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BlobMetaData: IBlobMetaData; BlobID: TISC_QUAD; BPB: IBPB=nil): IBlob;
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begin
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CheckHandle;
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Result := TFB25Blob.Create(self,transaction as TFB25transaction,BlobMetaData,BlobID,BPB);
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end;
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procedure TFB25Attachment.ExecImmediate(transaction: ITransaction; sql: string;
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aSQLDialect: integer);
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var TRHandle: TISC_TR_HANDLE;
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begin
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CheckHandle;
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TRHandle := (Transaction as TFB25Transaction).Handle;
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with Firebird25ClientAPI do
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if isc_dsql_execute_immediate(StatusVector, @fHandle, @TRHandle, 0,PChar(sql), aSQLDialect, nil) > 0 then
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IBDatabaseError;
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SignalActivity;
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end;
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function TFB25Attachment.Prepare(transaction: ITransaction; sql: string;
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aSQLDialect: integer): IStatement;
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begin
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CheckHandle;
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Result := TFB25Statement.Create(self,transaction,sql,aSQLDialect);
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end;
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function TFB25Attachment.PrepareWithNamedParameters(transaction: ITransaction;
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sql: string; aSQLDialect: integer; GenerateParamNames: boolean): IStatement;
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begin
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CheckHandle;
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Result := TFB25Statement.CreateWithParameterNames(self,transaction,sql,aSQLDialect,
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GenerateParamNames);
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end;
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function TFB25Attachment.GetEventHandler(Events: TStrings): IEvents;
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begin
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CheckHandle;
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Result := TFB25Events.Create(self,Events);
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end;
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function TFB25Attachment.OpenArray(transaction: ITransaction; RelationName, ColumnName: string;
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ArrayID: TISC_QUAD): IArray;
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begin
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CheckHandle;
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Result := TFB25Array.Create(self,transaction as TFB25Transaction,
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GetArrayMetaData(transaction,RelationName,ColumnName),ArrayID);
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end;
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function TFB25Attachment.CreateArray(transaction: ITransaction; RelationName, ColumnName: string): IArray;
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begin
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CheckHandle;
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Result := TFB25Array.Create(self,transaction as TFB25Transaction,
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GetArrayMetaData(transaction,RelationName,ColumnName));
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end;
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function TFB25Attachment.CreateArray(transaction: ITransaction;
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ArrayMetaData: IArrayMetaData): IArray;
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begin
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CheckHandle;
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Result := TFB25Array.Create(self,transaction as TFB25Transaction,ArrayMetaData);
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end;
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function TFB25Attachment.GetBlobMetaData(Transaction: ITransaction; tableName,
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columnName: string): IBlobMetaData;
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begin
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CheckHandle;
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Result := TFB25BlobMetaData.Create(self,Transaction as TFB25Transaction,tableName,columnName);
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end;
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function TFB25Attachment.GetArrayMetaData(Transaction: ITransaction; tableName,
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columnName: string): IArrayMetaData;
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begin
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CheckHandle;
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Result := TFB25ArrayMetaData.Create(self,Transaction as TFB25Transaction,tableName,columnName);
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end;
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function TFB25Attachment.GetDBInformation(Requests: array of byte
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): IDBInformation;
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var ReqBuffer: PByte;
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i: integer;
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begin
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CheckHandle;
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if Length(Requests) = 1 then
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Result := GetDBInformation(Requests[0])
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else
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begin
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Result := TDBInformation.Create;
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GetMem(ReqBuffer,Length(Requests));
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try
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for i := 0 to Length(Requests) - 1 do
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ReqBuffer[i] := Requests[i];
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with Firebird25ClientAPI, Result as TDBInformation do
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if isc_database_info(StatusVector, @(FHandle), Length(Requests), PChar(ReqBuffer),
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getBufSize, Buffer) > 0 then
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IBDataBaseError;
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finally
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FreeMem(ReqBuffer);
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end;
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end;
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end;
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function TFB25Attachment.GetDBInformation(Request: byte): IDBInformation;
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begin
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CheckHandle;
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Result := TDBInformation.Create;
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with Firebird25ClientAPI, Result as TDBInformation do
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if isc_database_info(StatusVector, @(FHandle), 1, @Request,
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getBufSize, Buffer) > 0 then
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IBDataBaseError;
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end;
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end.
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