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(*
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* Firebird UDR Support (fbudrtested). The fbudr components provide a set of
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* Pascal language bindings for the Firebird API in support of server
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* side User Defined Routines (UDRs). The fbudr package is an extension
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* to the Firebird Pascal 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) 2021 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 FBUdrPlugin;
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{$IFDEF MSWINDOWS}
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{$DEFINE WINDOWS}
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{$ENDIF}
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{$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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interface
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uses
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Classes, SysUtils, Firebird, IB, FBUDRIntf, FBUDRController, FB30Statement;
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type
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TFBUdrPluginEmulator = class;
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{ TEmulatedExternalContext }
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TEmulatedExternalContext = class(Firebird.IExternalContextImpl)
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private
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FAttachmentIntf: Firebird.IAttachment;
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FStatement: IStatement;
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FTransaction: ITransaction;
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FUserNameBuffer: Ansistring;
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FClientCharSet: AnsiString;
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FDatabaseName: AnsiString;
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public
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constructor Create(aStatement: IStatement);
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destructor Destroy; override;
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property Transaction: ITransaction read FTransaction write FTransaction;
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public
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{IExternalContext}
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function getMaster(): Firebird.IMaster; override;
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function getEngine(status: Firebird.IStatus): Firebird.IExternalEngine; override;
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function getAttachment(status: Firebird.IStatus): Firebird.IAttachment; override;
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function getTransaction(status: Firebird.IStatus): Firebird.ITransaction; override;
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function getUserName(): PAnsiChar; override;
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function getDatabaseName(): PAnsiChar; override;
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function getClientCharSet(): PAnsiChar; override;
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function obtainInfoCode(): Integer; override;
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function getInfo(code: Integer): Pointer; override;
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function setInfo(code: Integer; value: Pointer): Pointer; override;
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end;
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{ TEmulatedRoutineMetadata }
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TEmulatedRoutineMetadata = class(IRoutineMetadataImpl)
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private
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FManager: TFBUdrPluginEmulator;
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FName: AnsiString;
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FPackageName: AnsiString;
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FStatement: IStatement;
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FEntryPoint: AnsiString;
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FTableName: AnsiString;
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FTriggerType: cardinal;
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FInputMetadata: firebird.IMessageMetadata;
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FOutputMetadata: firebird.IMessageMetadata;
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FTriggerMetadata: firebird.IMessageMetadata;
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public
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constructor Create(aManager: TFBUdrPluginEmulator; aName, aPackageName, aEntryPoint: AnsiString; aStatement: IStatement);
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destructor Destroy; override;
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procedure SetTriggerInfo(aTableName: AnsiString; aTriggerType: cardinal);
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public
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{IRoutineMetadata}
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function getPackage(status: Firebird.IStatus): PAnsiChar; override;
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function getName(status: Firebird.IStatus): PAnsiChar; override;
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function getEntryPoint(status: Firebird.IStatus): PAnsiChar; override;
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function getBody(status: Firebird.IStatus): PAnsiChar; override;
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function getInputMetadata(status: Firebird.IStatus): IMessageMetadata; override;
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function getOutputMetadata(status: Firebird.IStatus): IMessageMetadata; override;
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function getTriggerMetadata(status: Firebird.IStatus): IMessageMetadata; override;
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function getTriggerTable(status: Firebird.IStatus): PAnsiChar; override;
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function getTriggerType(status: Firebird.IStatus): Cardinal; override;
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end;
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{ TExternalWrapper }
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TExternalWrapper = class
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protected
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FManager: TFBUdrPluginEmulator;
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FName: AnsiString;
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FPreparedStatement: IStatement;
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FContext: TEmulatedExternalContext;
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FRoutineMetadata: TEmulatedRoutineMetadata;
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FStatus: Firebird.IStatus;
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FInputParams: ISQLParams;
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procedure CheckStatus;
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procedure ChangeResultsCharset(FromID, toID: integer);
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procedure Setup;
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procedure DoSetup(status: Firebird.IStatus;
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context: Firebird.IExternalContext;
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metadata: Firebird.IRoutineMetadata;
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inBuilder: Firebird.IMetadataBuilder;
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outBuilder: Firebird.IMetadataBuilder); virtual; abstract;
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public
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constructor Create(aManager: TFBUdrPluginEmulator; aName, aPackageName, aEntryPoint: AnsiString;
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preparedStmt: IStatement);
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destructor Destroy; override;
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end;
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{ TExternalFunctionWrapper }
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TExternalFunctionWrapper = class(TExternalWrapper)
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private
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FFunctionFactory: TFBUDRFunctionFactory;
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protected
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procedure DoSetup(status: Firebird.IStatus;
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context: Firebird.IExternalContext;
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metadata: Firebird.IRoutineMetadata;
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inBuilder: Firebird.IMetadataBuilder;
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outBuilder: Firebird.IMetadataBuilder); override;
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public
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constructor Create(aManager: TFBUdrPluginEmulator;aName, aPackageName, aEntryPoint: AnsiString;
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aFunctionFactory: TFBUDRFunctionFactory;
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preparedStmt: IStatement);
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function Execute(aTransaction: ITransaction): ISQLData;
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property InputParams: ISQLParams read FInputParams;
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end;
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{IProcedureResults is a cut down version of IResultsSet}
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IProcedureResults = interface
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['{1b851373-a7c2-493e-b457-6a19980e0f5f}']
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function getCount: integer;
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function ByName(Idx: AnsiString): ISQLData;
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function getSQLData(index: integer): ISQLData;
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function FetchNext: boolean; {fetch next record}
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function IsEof: boolean;
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property Data[index: integer]: ISQLData read getSQLData; default;
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property Count: integer read getCount;
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end;
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{ TExternalProcedureWrapper }
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TExternalProcedureWrapper = class(TExternalWrapper)
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private
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FProcedureFactory: TFBUDRProcedureFactory;
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protected
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procedure DoSetup(status: Firebird.IStatus;
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context: Firebird.IExternalContext;
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metadata: Firebird.IRoutineMetadata;
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inBuilder: Firebird.IMetadataBuilder;
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outBuilder: Firebird.IMetadataBuilder); override;
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public
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constructor Create(aManager: TFBUdrPluginEmulator; aName, aPackageName, aEntryPoint: AnsiString;
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aProcedureFactory: TFBUDRProcedureFactory;
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preparedStmt: IStatement);
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function Execute(aTransaction: ITransaction): IProcedureResults;
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property InputParams: ISQLParams read FInputParams;
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end;
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{ TFBTriggerSQLDA }
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TFBTriggerSQLDA = class(TIBXINPUTSQLDA)
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private
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FAttachment: IAttachment;
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protected
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function GetAttachment: IAttachment; override;
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function CanChangeMetaData: boolean; override;
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public
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{created with the input messge metadata and a pointer to the inMsg buffer}
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constructor Create(att: IAttachment; aMetadata: Firebird.IMessageMetaData);
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procedure Finalise;
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end;
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{ TExternalTriggerWrapper }
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TExternalTriggerWrapper = class(TExternalWrapper)
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private
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FTriggerFactory: TFBUDRTriggerFactory;
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FTriggerOldSQLDA: TFBTriggerSQLDA;
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FTriggerNewSQLDA: TFBTriggerSQLDA;
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FOldValues: IFBUDROutputData;
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FNewValues: IFBUDROutputData;
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protected
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procedure DoSetup(status: Firebird.IStatus;
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context: Firebird.IExternalContext;
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metadata: Firebird.IRoutineMetadata;
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inBuilder: Firebird.IMetadataBuilder;
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outBuilder: Firebird.IMetadataBuilder); override;
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public
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constructor Create(aManager: TFBUdrPluginEmulator; aName, aTableName, aEntryPoint: AnsiString;
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aTriggerType: cardinal;
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aTriggerFactory: TFBUDRTriggerFactory;
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preparedStmt: IStatement);
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destructor Destroy; override;
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procedure Execute(aTransaction: ITransaction; action: cardinal);
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property OldValues: IFBUDROutputData read FOldValues;
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property NewValues: IFBUDROutputData read FNewValues;
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end;
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{ TFBUdrPluginEmulator }
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TFBUdrPluginEmulator = class(Firebird.IUdrPluginImpl)
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private
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FModuleName: AnsiString;
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FTheirUnloadFlag: booleanPtr;
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FMyUnloadFlag: boolean;
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FStatus: Firebird.IStatus;
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FAttachment: IAttachment;
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FFunctionFactories: TStringList;
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FProcedureFactories: TStringList;
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FTriggerFactories: TStringList;
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procedure CheckStatus;
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procedure FreeList(var list: TStringList);
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function CreateSelectFunctionSQL(aFunctionName: AnsiString): AnsiString;
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function CreateExecProcedureSQL(aProcName: AnsiString): AnsiString;
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procedure SetAttachment(AValue: IAttachment);
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public
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{IUdrPluginImpl}
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function getMaster(): IMaster; override;
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procedure registerFunction(status: Firebird.IStatus; name: PAnsiChar; factory: Firebird.IUdrFunctionFactory); override;
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procedure registerProcedure(status: Firebird.IStatus; name: PAnsiChar; factory: Firebird.IUdrProcedureFactory); override;
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procedure registerTrigger(status: Firebird.IStatus; name: PAnsiChar; factory: Firebird.IUdrTriggerFactory); override;
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public
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constructor Create(aModuleName: AnsiString);
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destructor Destroy; override;
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function makeFunction(aFunctionName, aPackageName,
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aEntryPoint: AnsiString): TExternalFunctionWrapper;
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function makeProcedure(aProcName, aPackageName, aEntryPoint: AnsiString): TExternalProcedureWrapper;
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function makeTrigger(aName, aEntryPoint, datasetName: AnsiString; aTriggerType: cardinal
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): TExternalTriggerWrapper;
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property Attachment: IAttachment read FAttachment write SetAttachment;
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property ModuleName: AnsiString read FModuleName;
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end;
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implementation
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uses FBClientLib, IBUtils, FB30Attachment, FB30Transaction,
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FBSQLData, FBUDRUtils;
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resourcestring
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SNoMasterInterface = 'A Master Interface is required - legacy API not supported';
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SNoAttachment = 'An attachment must be provided before a statement can be prepared';
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type
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{ TProcedureResults }
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TProcedureResults = class(TInterfacedObject,IProcedureResults)
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private
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FExternalResultSet: Firebird.IExternalResultSet;
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FResults: IResults;
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FIsEof: boolean;
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FManager: TFBUdrPluginEmulator;
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public
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constructor Create(aManager: TFBUdrPluginEmulator;
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aExternalResultSet: Firebird.IExternalResultSet;
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aSQLRecord: TIBXOUTPUTSQLDA);
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destructor Destroy; override;
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public
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{IProcedureResults}
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function getCount: integer;
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function ByName(Idx: AnsiString): ISQLData;
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function getSQLData(index: integer): ISQLData;
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function FetchNext: boolean; {fetch next record}
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function IsEof: boolean;
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end;
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{ TFBTriggerSQLDA }
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function TFBTriggerSQLDA.GetAttachment: IAttachment;
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begin
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Result := FAttachment;
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end;
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function TFBTriggerSQLDA.CanChangeMetaData: boolean;
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begin
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Result := false;
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end;
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constructor TFBTriggerSQLDA.Create(att: IAttachment;
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aMetadata: Firebird.IMessageMetaData);
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begin
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inherited Create(FirebirdAPI);
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FAttachment := att;
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Bind(aMetaData);
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end;
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procedure TFBTriggerSQLDA.Finalise;
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begin
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PackBuffer;
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end;
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{ TExternalTriggerWrapper }
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procedure TExternalTriggerWrapper.DoSetup(status: Firebird.IStatus;
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context: Firebird.IExternalContext; metadata: Firebird.IRoutineMetadata;
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inBuilder: Firebird.IMetadataBuilder; outBuilder: Firebird.IMetadataBuilder);
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begin
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FTriggerFactory.setup(status,context,metadata,outBuilder);
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end;
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constructor TExternalTriggerWrapper.Create(aManager: TFBUdrPluginEmulator; aName,
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aTableName, aEntryPoint: AnsiString; aTriggerType: cardinal;
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aTriggerFactory: TFBUDRTriggerFactory; preparedStmt: IStatement);
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begin
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inherited Create(aManager,aName,'',aEntryPoint, preparedStmt);
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FTriggerFactory := aTriggerFactory;
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FRoutineMetadata.SetTriggerInfo(aTableName,aTriggerType);
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FTriggerOldSQLDA := TFBTriggerSQLDA.Create(FManager.Attachment,(preparedStmt as TFB30Statement).SQLRecord.GetMetaData);
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FTriggerNewSQLDA := TFBTriggerSQLDA.Create(FManager.Attachment,(preparedStmt as TFB30Statement).SQLRecord.GetMetaData);
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FOldValues := TFBUDROutputParams.Create(FTriggerOldSQLDA);
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FOldValues.Clear;
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FNewValues := TFBUDROutputParams.Create(FTriggerNewSQLDA);
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FNewValues.Clear;
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end;
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destructor TExternalTriggerWrapper.Destroy;
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begin
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FOldValues := nil;
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FNewValues := nil;
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if FTriggerOldSQLDA <> nil then
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FTriggerOldSQLDA.Free;
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if FTriggerNewSQLDA <> nil then
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FTriggerNewSQLDA.Free;
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inherited Destroy;
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end;
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350 |
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procedure TExternalTriggerWrapper.Execute(aTransaction: ITransaction;
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action: cardinal);
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var aTriggerInstance: Firebird.IExternalTrigger;
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Buffer: array [0..512] of AnsiChar;
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begin
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(FContext as TEmulatedExternalContext).Transaction := aTransaction;
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try
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Setup;
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aTriggerInstance := FTriggerFactory.newItem(FStatus,FContext,FRoutineMetadata);
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try
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Buffer[0] := #0;
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aTriggerInstance.getCharSet(FStatus,FContext,@Buffer,sizeof(Buffer)); {The UDR engine does this thus so do we}
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CheckStatus;
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FTriggerOldSQLDA.Finalise;
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FTriggerNewSQLDA.Finalise;
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aTriggerInstance.execute(FStatus,FContext,action,
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FTriggerOldSQLDA.MessageBuffer,
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FTriggerNewSQLDA.MessageBuffer
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);
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370 |
finally
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371 |
aTriggerInstance.dispose;
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end;
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373 |
finally
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374 |
(FContext as TEmulatedExternalContext).Transaction := nil;
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end;
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end;
|
377 |
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378 |
{ TExternalProcedureWrapper }
|
379 |
|
380 |
procedure TExternalProcedureWrapper.DoSetup(status: Firebird.IStatus;
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381 |
context: Firebird.IExternalContext; metadata: Firebird.IRoutineMetadata;
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inBuilder: Firebird.IMetadataBuilder; outBuilder: Firebird.IMetadataBuilder);
|
383 |
begin
|
384 |
FProcedureFactory.setup(status,context,metadata,inBuilder,outBuilder);
|
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end;
|
386 |
|
387 |
constructor TExternalProcedureWrapper.Create(aManager: TFBUdrPluginEmulator; aName,
|
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aPackageName, aEntryPoint: AnsiString;
|
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aProcedureFactory: TFBUDRProcedureFactory; preparedStmt: IStatement);
|
390 |
begin
|
391 |
inherited Create(aManager,aName, aPackageName, aEntryPoint, preparedStmt);
|
392 |
FProcedureFactory := aProcedureFactory;
|
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end;
|
394 |
|
395 |
function TExternalProcedureWrapper.Execute(aTransaction: ITransaction
|
396 |
): IProcedureResults;
|
397 |
var aProcedureInstance: Firebird.IExternalProcedure;
|
398 |
Buffer: array [0..512] of AnsiChar;
|
399 |
ResultsSet: IExternalResultSet;
|
400 |
OutputData: IResults;
|
401 |
begin
|
402 |
Result := nil;
|
403 |
(FContext as TEmulatedExternalContext).Transaction := aTransaction;
|
404 |
try
|
405 |
Setup;
|
406 |
aProcedureInstance := FProcedureFactory.newItem(FStatus,FContext,FRoutineMetadata);
|
407 |
try
|
408 |
Buffer[0] := #0;
|
409 |
aProcedureInstance.getCharSet(FStatus,FContext,@Buffer,sizeof(Buffer));
|
410 |
CheckStatus;
|
411 |
ResultsSet := aProcedureInstance.open(FStatus,FContext,
|
412 |
(FPreparedStatement as TFB30Statement).SQLParams.MessageBuffer,
|
413 |
(FPreparedStatement as TFB30Statement).SQLRecord.MessageBuffer);
|
414 |
CheckStatus;
|
415 |
if ResultsSet <> nil then
|
416 |
Result := TProcedureResults.Create(FManager,ResultsSet,(FPreparedStatement as TFB30Statement).SQLRecord);
|
417 |
finally
|
418 |
aProcedureInstance.dispose;
|
419 |
end;
|
420 |
finally
|
421 |
(FContext as TEmulatedExternalContext).Transaction := nil;
|
422 |
end;
|
423 |
end;
|
424 |
|
425 |
{ TProcedureResults }
|
426 |
|
427 |
constructor TProcedureResults.Create(aManager: TFBUdrPluginEmulator;
|
428 |
aExternalResultSet: Firebird.IExternalResultSet; aSQLRecord: TIBXOUTPUTSQLDA);
|
429 |
begin
|
430 |
inherited Create;
|
431 |
FManager := aManager;
|
432 |
FExternalResultSet := aExternalResultSet;
|
433 |
FResults := TResults.Create(aSQLRecord);
|
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end;
|
435 |
|
436 |
destructor TProcedureResults.Destroy;
|
437 |
begin
|
438 |
if FExternalResultSet <> nil then
|
439 |
FExternalResultSet.dispose;
|
440 |
inherited Destroy;
|
441 |
end;
|
442 |
|
443 |
function TProcedureResults.getCount: integer;
|
444 |
begin
|
445 |
Result := FResults.Count;
|
446 |
end;
|
447 |
|
448 |
function TProcedureResults.ByName(Idx: AnsiString): ISQLData;
|
449 |
begin
|
450 |
Result := FResults.ByName(Idx);
|
451 |
end;
|
452 |
|
453 |
function TProcedureResults.getSQLData(index: integer): ISQLData;
|
454 |
begin
|
455 |
Result := FResults.getSQLData(index);
|
456 |
end;
|
457 |
|
458 |
function TProcedureResults.FetchNext: boolean;
|
459 |
begin
|
460 |
Result := FExternalResultSet.fetch(FManager.FStatus);
|
461 |
FManager.CheckStatus;
|
462 |
FIsEof := not Result;
|
463 |
end;
|
464 |
|
465 |
function TProcedureResults.IsEof: boolean;
|
466 |
begin
|
467 |
Result := FIsEOF;
|
468 |
end;
|
469 |
|
470 |
{ TExternalWrapper }
|
471 |
|
472 |
procedure TExternalWrapper.CheckStatus;
|
473 |
var buffer: array [0..4096] of AnsiChar;
|
474 |
begin
|
475 |
with FStatus do
|
476 |
if (getState and STATE_ERRORS) <> 0 then
|
477 |
begin
|
478 |
FManager.getMaster.getUtilInterface.formatStatus(@buffer,sizeof(buffer),FStatus);
|
479 |
raise Exception.Create(strpas(PAnsiChar(@buffer)));
|
480 |
end;
|
481 |
end;
|
482 |
|
483 |
procedure TExternalWrapper.ChangeResultsCharset(FromID, toID: integer);
|
484 |
var i: integer;
|
485 |
begin
|
486 |
with (FPreparedStatement as TFB30Statement) do
|
487 |
for i := 0 to SQLRecord.Count - 1 do
|
488 |
if SQLRecord.Column[i].CharSetID = FromID then
|
489 |
SQLRecord.Column[i].CharSetID := ToID;
|
490 |
end;
|
491 |
|
492 |
procedure TExternalWrapper.Setup;
|
493 |
var inBuilder: Firebird.IMetadataBuilder;
|
494 |
outBuilder: Firebird.IMetadataBuilder;
|
495 |
inMetadata: Firebird.IMessageMetadata;
|
496 |
outMetadata: Firebird.IMessageMetadata;
|
497 |
begin
|
498 |
inMetadata := FRoutineMetadata.getInputMetadata(FStatus);
|
499 |
CheckStatus;
|
500 |
if inMetadata <> nil then
|
501 |
try
|
502 |
inBuilder := inMetadata.getBuilder(FStatus);
|
503 |
CheckStatus;
|
504 |
finally
|
505 |
inMetadata.release;
|
506 |
end
|
507 |
else
|
508 |
inBuilder := nil;
|
509 |
|
510 |
outMetadata := FRoutineMetadata.getOutputMetadata(FStatus);
|
511 |
CheckStatus;
|
512 |
if outMetadata <> nil then
|
513 |
try
|
514 |
outBuilder := outMetadata.getBuilder(FStatus);
|
515 |
CheckStatus;
|
516 |
finally
|
517 |
outMetadata.release;
|
518 |
end
|
519 |
else
|
520 |
outBuilder := nil;
|
521 |
DoSetup(FStatus,FContext,FRoutineMetadata,inBuilder,outBuilder);
|
522 |
CheckStatus;
|
523 |
end;
|
524 |
|
525 |
constructor TExternalWrapper.Create(aManager: TFBUdrPluginEmulator; aName,
|
526 |
aPackageName, aEntryPoint: AnsiString; preparedStmt: IStatement);
|
527 |
begin
|
528 |
inherited Create;
|
529 |
FManager := aManager;
|
530 |
FName := aName;
|
531 |
FPreparedStatement := preparedStmt;
|
532 |
FContext := TEmulatedExternalContext.Create(FPreparedStatement);
|
533 |
FRoutineMetadata := TEmulatedRoutineMetadata.Create(aManager,aName,aPackageName,aEntryPoint,FPreparedStatement);
|
534 |
FStatus := FContext.getMaster.getStatus;
|
535 |
FInputParams := FPreparedStatement.SQLParams;
|
536 |
end;
|
537 |
|
538 |
destructor TExternalWrapper.Destroy;
|
539 |
begin
|
540 |
if FContext <> nil then
|
541 |
FContext.Free;
|
542 |
if FRoutineMetadata <> nil then
|
543 |
FRoutineMetadata.Free;
|
544 |
if FStatus <> nil then
|
545 |
FStatus.dispose;
|
546 |
inherited Destroy;
|
547 |
end;
|
548 |
|
549 |
{ TEmulatedRoutineMetadata }
|
550 |
|
551 |
constructor TEmulatedRoutineMetadata.Create(aManager: TFBUdrPluginEmulator; aName,
|
552 |
aPackageName, aEntryPoint: AnsiString; aStatement: IStatement);
|
553 |
begin
|
554 |
inherited Create;
|
555 |
FManager := aManager;
|
556 |
FName := aName;
|
557 |
FPackageName := aPackageName;
|
558 |
FEntryPoint := aEntryPoint;
|
559 |
FStatement := aStatement;
|
560 |
end;
|
561 |
|
562 |
destructor TEmulatedRoutineMetadata.Destroy;
|
563 |
begin
|
564 |
if FInputMetadata <> nil then
|
565 |
FInputMetadata.release;
|
566 |
if FOutputMetadata <> nil then
|
567 |
FOutputMetadata.release;
|
568 |
if FTriggerMetadata <> nil then
|
569 |
FTriggerMetadata.release;
|
570 |
inherited Destroy;
|
571 |
end;
|
572 |
|
573 |
procedure TEmulatedRoutineMetadata.SetTriggerInfo(aTableName: AnsiString;
|
574 |
aTriggerType: cardinal);
|
575 |
begin
|
576 |
FTableName := aTableName;
|
577 |
FTriggerType := aTriggerType;
|
578 |
end;
|
579 |
|
580 |
function TEmulatedRoutineMetadata.getPackage(status: Firebird.IStatus
|
581 |
): PAnsiChar;
|
582 |
begin
|
583 |
Result := PAnsiChar(FPackageName);
|
584 |
end;
|
585 |
|
586 |
function TEmulatedRoutineMetadata.getName(status: Firebird.IStatus): PAnsiChar;
|
587 |
begin
|
588 |
Result := PAnsiChar(FName);
|
589 |
end;
|
590 |
|
591 |
function TEmulatedRoutineMetadata.getEntryPoint(status: Firebird.IStatus
|
592 |
): PAnsiChar;
|
593 |
begin
|
594 |
Result := PAnsiChar(FEntryPoint);
|
595 |
end;
|
596 |
|
597 |
function TEmulatedRoutineMetadata.getBody(status: Firebird.IStatus): PAnsiChar;
|
598 |
begin
|
599 |
Result := nil;
|
600 |
end;
|
601 |
|
602 |
function TEmulatedRoutineMetadata.getInputMetadata(status: Firebird.IStatus
|
603 |
): IMessageMetadata;
|
604 |
begin
|
605 |
if (FTriggerType = 0) and (FInputMetadata = nil) then
|
606 |
FInputMetadata := (FStatement as TFB30Statement).SQLParams.GetMetaData ;
|
607 |
Result := FInputMetadata;
|
608 |
if Result <> nil then
|
609 |
Result.addRef();
|
610 |
end;
|
611 |
|
612 |
function TEmulatedRoutineMetadata.getOutputMetadata(status: Firebird.IStatus
|
613 |
): IMessageMetadata;
|
614 |
begin
|
615 |
if (FTriggerType = 0) and (FOutputMetadata = nil) then
|
616 |
FOutputMetadata := (FStatement as TFB30Statement).SQLRecord.GetMetaData;
|
617 |
Result := FOutputMetadata;
|
618 |
if Result <> nil then
|
619 |
Result.addRef();
|
620 |
end;
|
621 |
|
622 |
function TEmulatedRoutineMetadata.getTriggerMetadata(status: Firebird.IStatus
|
623 |
): IMessageMetadata;
|
624 |
begin
|
625 |
if (FTriggerType <> 0) and (FTriggerMetadata = nil) then
|
626 |
FTriggerMetadata := (FStatement as TFB30Statement).SQLRecord.GetMetaData;
|
627 |
Result := FTriggerMetadata;
|
628 |
if Result <> nil then
|
629 |
Result.addRef();
|
630 |
end;
|
631 |
|
632 |
function TEmulatedRoutineMetadata.getTriggerTable(status: Firebird.IStatus
|
633 |
): PAnsiChar;
|
634 |
begin
|
635 |
Result := PAnsiChar(FTableName);
|
636 |
end;
|
637 |
|
638 |
function TEmulatedRoutineMetadata.getTriggerType(status: Firebird.IStatus
|
639 |
): Cardinal;
|
640 |
begin
|
641 |
Result := FTriggerType;
|
642 |
end;
|
643 |
|
644 |
{ TExternalFunctionWrapper }
|
645 |
|
646 |
constructor TExternalFunctionWrapper.Create(aManager: TFBUdrPluginEmulator; aName,
|
647 |
aPackageName, aEntryPoint: AnsiString;
|
648 |
aFunctionFactory: TFBUDRFunctionFactory; preparedStmt: IStatement);
|
649 |
begin
|
650 |
inherited Create(aManager,aName, aPackageName, aEntryPoint, preparedStmt);
|
651 |
FFunctionFactory := aFunctionFactory;
|
652 |
end;
|
653 |
|
654 |
function TExternalFunctionWrapper.Execute(aTransaction: ITransaction): ISQLData;
|
655 |
var aFunctionInstance: Firebird.IExternalFunction;
|
656 |
Buffer: array [0..512] of AnsiChar;
|
657 |
CodePage: TSystemCodePage;
|
658 |
OutputData: IResults;
|
659 |
begin
|
660 |
(FContext as TEmulatedExternalContext).Transaction := aTransaction;
|
661 |
try
|
662 |
Setup;
|
663 |
aFunctionInstance := FFunctionFactory.newItem(FStatus,FContext,FRoutineMetadata);
|
664 |
try
|
665 |
Buffer[0] := #0;
|
666 |
aFunctionInstance.getCharSet(FStatus,FContext,@Buffer,sizeof(Buffer));
|
667 |
CheckStatus;
|
668 |
aFunctionInstance.execute(FStatus,FContext,
|
669 |
(FPreparedStatement as TFB30Statement).SQLParams.MessageBuffer,
|
670 |
(FPreparedStatement as TFB30Statement).SQLRecord.MessageBuffer);
|
671 |
CheckStatus;
|
672 |
OutputData := TResults.Create( (FPreparedStatement as TFB30Statement).SQLRecord);
|
673 |
Result := OutputData[0];
|
674 |
finally
|
675 |
aFunctionInstance.dispose;
|
676 |
end;
|
677 |
finally
|
678 |
(FContext as TEmulatedExternalContext).Transaction := nil;
|
679 |
end;
|
680 |
end;
|
681 |
|
682 |
procedure TExternalFunctionWrapper.DoSetup(status: Firebird.IStatus;
|
683 |
context: Firebird.IExternalContext; metadata: Firebird.IRoutineMetadata;
|
684 |
inBuilder: Firebird.IMetadataBuilder; outBuilder: Firebird.IMetadataBuilder);
|
685 |
begin
|
686 |
FFunctionFactory.setup(status,context,metadata,inBuilder,outBuilder);
|
687 |
end;
|
688 |
|
689 |
{ TEmulatedExternalContext }
|
690 |
|
691 |
constructor TEmulatedExternalContext.Create(aStatement: IStatement);
|
692 |
begin
|
693 |
inherited Create;
|
694 |
FStatement := aStatement;
|
695 |
FAttachmentIntf := (FStatement.GetAttachment as TFB30Attachment).AttachmentIntf;
|
696 |
FAttachmentIntf.addRef;
|
697 |
end;
|
698 |
|
699 |
destructor TEmulatedExternalContext.Destroy;
|
700 |
begin
|
701 |
if FAttachmentIntf <> nil then
|
702 |
FAttachmentIntf.release;
|
703 |
inherited Destroy;
|
704 |
end;
|
705 |
|
706 |
function TEmulatedExternalContext.getMaster(): Firebird.IMaster;
|
707 |
var MasterProvider: IFBIMasterProvider;
|
708 |
begin
|
709 |
if FirebirdAPI.HasMasterIntf and (FirebirdAPI.QueryInterface(IFBIMasterProvider,MasterProvider) = S_OK) then
|
710 |
Result := MasterProvider.GetIMasterIntf
|
711 |
else
|
712 |
Result := nil;
|
713 |
end;
|
714 |
|
715 |
function TEmulatedExternalContext.getEngine(status: Firebird.IStatus
|
716 |
): Firebird.IExternalEngine;
|
717 |
begin
|
718 |
Result := nil;
|
719 |
end;
|
720 |
|
721 |
function TEmulatedExternalContext.getAttachment(status: Firebird.IStatus
|
722 |
): Firebird.IAttachment;
|
723 |
begin
|
724 |
Result := FAttachmentIntf;
|
725 |
end;
|
726 |
|
727 |
function TEmulatedExternalContext.getTransaction(status: Firebird.IStatus
|
728 |
): Firebird.ITransaction;
|
729 |
begin
|
730 |
Result := (FTransaction as TFB30Transaction).TransactionIntf;
|
731 |
end;
|
732 |
|
733 |
function TEmulatedExternalContext.getUserName(): PAnsiChar;
|
734 |
var DPB: IDPB;
|
735 |
DPBItem: IDPBItem;
|
736 |
begin
|
737 |
Result := '';
|
738 |
DPB := FStatement.GetAttachment.getDPB;
|
739 |
DPBItem := DPB.Find(isc_dpb_user_name);
|
740 |
if DPBItem <> nil then
|
741 |
begin
|
742 |
FUserNameBuffer := DPBItem.AsString;
|
743 |
Result := PAnsiChar(FUserNameBuffer);
|
744 |
end;
|
745 |
end;
|
746 |
|
747 |
function TEmulatedExternalContext.getDatabaseName(): PAnsiChar;
|
748 |
var ServerName: AnsiString;
|
749 |
Protocol: TProtocolAll;
|
750 |
PortNo: AnsiString;
|
751 |
begin
|
752 |
Result := '';
|
753 |
if ParseConnectString(FStatement.getAttachment.GetConnectString,
|
754 |
ServerName,FDatabaseName,Protocol,PortNo) then
|
755 |
Result := PAnsiChar(FDatabaseName);
|
756 |
end;
|
757 |
|
758 |
function TEmulatedExternalContext.getClientCharSet(): PAnsiChar;
|
759 |
var DPB: IDPB;
|
760 |
DPBItem: IDPBItem;
|
761 |
begin
|
762 |
Result := '';
|
763 |
DPB := FStatement.GetAttachment.getDPB;
|
764 |
DPBItem := DPB.Find(isc_dpb_lc_ctype);
|
765 |
if DPBItem <> nil then
|
766 |
begin
|
767 |
FClientCharSet := DPBItem.AsString;
|
768 |
Result := PAnsiChar(FClientCharSet);
|
769 |
end;
|
770 |
end;
|
771 |
|
772 |
function TEmulatedExternalContext.obtainInfoCode(): Integer;
|
773 |
begin
|
774 |
Result := 0;
|
775 |
end;
|
776 |
|
777 |
function TEmulatedExternalContext.getInfo(code: Integer): Pointer;
|
778 |
begin
|
779 |
Result := nil;
|
780 |
end;
|
781 |
|
782 |
function TEmulatedExternalContext.setInfo(code: Integer; value: Pointer
|
783 |
): Pointer;
|
784 |
begin
|
785 |
Result := nil;
|
786 |
end;
|
787 |
|
788 |
{ TFBUdrPluginEmulator }
|
789 |
|
790 |
function TFBUdrPluginEmulator.getMaster(): IMaster;
|
791 |
var MasterProvider: IFBIMasterProvider;
|
792 |
begin
|
793 |
if FirebirdAPI.HasMasterIntf and (FirebirdAPI.QueryInterface(IFBIMasterProvider,MasterProvider) = S_OK) then
|
794 |
Result := MasterProvider.GetIMasterIntf
|
795 |
else
|
796 |
Result := nil;
|
797 |
end;
|
798 |
|
799 |
procedure TFBUdrPluginEmulator.registerFunction(status: Firebird.IStatus;
|
800 |
name: PAnsiChar; factory: Firebird.IUdrFunctionFactory);
|
801 |
begin
|
802 |
FFunctionFactories.AddObject(strpas(name),factory);
|
803 |
end;
|
804 |
|
805 |
procedure TFBUdrPluginEmulator.registerProcedure(status: Firebird.IStatus;
|
806 |
name: PAnsiChar; factory: Firebird.IUdrProcedureFactory);
|
807 |
begin
|
808 |
FProcedureFactories.AddObject(strpas(name),factory);
|
809 |
end;
|
810 |
|
811 |
procedure TFBUdrPluginEmulator.registerTrigger(status: Firebird.IStatus;
|
812 |
name: PAnsiChar; factory: Firebird.IUdrTriggerFactory);
|
813 |
begin
|
814 |
FTriggerFactories.AddObject(strpas(name),factory);
|
815 |
end;
|
816 |
|
817 |
constructor TFBUdrPluginEmulator.Create(aModuleName: AnsiString);
|
818 |
begin
|
819 |
inherited Create;
|
820 |
FModuleName := aModuleName;
|
821 |
FStatus := GetMaster.getStatus;
|
822 |
FFunctionFactories := TStringList.Create;
|
823 |
FProcedureFactories := TStringList.Create;
|
824 |
FTriggerFactories := TStringList.Create;
|
825 |
FTheirUnloadFlag := firebird_udr_plugin(FStatus,@FMyUnloadFlag,self);
|
826 |
CheckStatus;
|
827 |
end;
|
828 |
|
829 |
destructor TFBUdrPluginEmulator.Destroy;
|
830 |
begin
|
831 |
FreeList(FFunctionFactories);
|
832 |
FreeList(FProcedureFactories);
|
833 |
FreeList(FTriggerFactories);
|
834 |
if FStatus <> nil then
|
835 |
FStatus.dispose();
|
836 |
inherited Destroy;
|
837 |
end;
|
838 |
|
839 |
procedure TFBUdrPluginEmulator.CheckStatus;
|
840 |
var buffer: array [0..4096] of AnsiChar;
|
841 |
begin
|
842 |
with FStatus do
|
843 |
if (getState and STATE_ERRORS) <> 0 then
|
844 |
begin
|
845 |
getMaster.getUtilInterface.formatStatus(@buffer,sizeof(buffer),FStatus);
|
846 |
raise Exception.Create(strpas(PAnsiChar(@buffer)));
|
847 |
end;
|
848 |
end;
|
849 |
|
850 |
procedure TFBUdrPluginEmulator.FreeList(var list: TStringList);
|
851 |
var i: integer;
|
852 |
obj: TObject;
|
853 |
begin
|
854 |
if List = nil then Exit;
|
855 |
|
856 |
for i := 0 to List.Count - 1 do
|
857 |
begin
|
858 |
obj := List.Objects[i];
|
859 |
if obj <> nil then
|
860 |
begin
|
861 |
if obj is TFBUDRFunctionFactory then
|
862 |
TFBUDRFunctionFactory(obj).dispose
|
863 |
else
|
864 |
if obj is TFBUDRProcedureFactory then
|
865 |
TFBUDRProcedureFactory(obj).dispose
|
866 |
else
|
867 |
if obj is TFBUDRTriggerFactory then
|
868 |
TFBUDRTriggerFactory(obj).dispose;
|
869 |
end;
|
870 |
end;
|
871 |
FreeAndNil(List);
|
872 |
end;
|
873 |
|
874 |
function TFBUdrPluginEmulator.CreateSelectFunctionSQL(aFunctionName: AnsiString
|
875 |
): AnsiString;
|
876 |
const
|
877 |
FunctionArgsSQL =
|
878 |
'SELECT * FROM RDB$FUNCTION_ARGUMENTS RFA JOIN RDB$FIELDS FLD ' +
|
879 |
'ON RFA.RDB$FIELD_SOURCE = FLD.RDB$FIELD_NAME '+
|
880 |
'WHERE RDB$FUNCTION_NAME = ? ' +
|
881 |
'ORDER BY RDB$ARGUMENT_POSITION';
|
882 |
var args: IResultset;
|
883 |
arglist: AnsiString;
|
884 |
separator: AnsiString;
|
885 |
begin
|
886 |
if not FAttachment.HasFunction(aFunctionName) then
|
887 |
aFunctionName := AnsiUpperCase(aFunctionName);
|
888 |
args := FAttachment.OpenCursorAtStart(FunctionArgsSQL,[aFunctionName]);
|
889 |
arglist := '';
|
890 |
separator := ':';
|
891 |
while not args.IsEof do
|
892 |
begin
|
893 |
if args.ByName('RDB$ARGUMENT_POSITION').AsInteger > 0 then
|
894 |
begin
|
895 |
arglist := arglist + separator + Trim(args.ByName('RDB$ARGUMENT_NAME').AsString);
|
896 |
separator := ', :';
|
897 |
end;
|
898 |
args.FetchNext;
|
899 |
end;
|
900 |
Result := 'Select ' + QuoteIdentifierIfNeeded(FAttachment.GetSQLDialect,aFunctionName) + '(' + arglist + ') From RDB$DATABASE';
|
901 |
end;
|
902 |
|
903 |
function TFBUdrPluginEmulator.CreateExecProcedureSQL(aProcName: AnsiString): AnsiString;
|
904 |
const
|
905 |
sGetProcArgsSQL =
|
906 |
'SELECT * ' +
|
907 |
' FROM RDB$PROCEDURE_PARAMETERS PRM JOIN RDB$FIELDS FLD ON ' +
|
908 |
' PRM.RDB$FIELD_SOURCE = FLD.RDB$FIELD_NAME ' +
|
909 |
'WHERE ' +
|
910 |
' PRM.RDB$PROCEDURE_NAME = ? AND ' +
|
911 |
' PRM.RDB$PARAMETER_TYPE = 0 ' +
|
912 |
'ORDER BY PRM.RDB$PARAMETER_NUMBER';
|
913 |
|
914 |
sGetProcType = 'Select RDB$PROCEDURE_TYPE FROM RDB$PROCEDURES ' +
|
915 |
'Where Trim(RDB$PROCEDURE_NAME) = ?';
|
916 |
|
917 |
var args: IResultset;
|
918 |
arglist: AnsiString;
|
919 |
separator: AnsiString;
|
920 |
ProcType: integer;
|
921 |
begin
|
922 |
if not FAttachment.HasProcedure(aProcName) then
|
923 |
aProcName := AnsiUpperCase(aProcName);
|
924 |
args := FAttachment.OpenCursorAtStart(sGetProcArgsSQL,[aProcName]);
|
925 |
arglist := '';
|
926 |
separator := ':';
|
927 |
while not args.IsEof do
|
928 |
begin
|
929 |
arglist := arglist + separator + Trim(args.ByName('RDB$PARAMETER_NAME').AsString);
|
930 |
separator := ', :';
|
931 |
args.FetchNext;
|
932 |
end;
|
933 |
ProcType := FAttachment.OpenCursorAtStart(sGetProcType,[aProcName])[0].AsInteger;
|
934 |
case ProcType of
|
935 |
1:
|
936 |
if arglist <> '' then
|
937 |
Result := 'Select * From ' + QuoteIdentifierIfNeeded(FAttachment.GetSQLDialect,aProcName) + '(' + arglist + ')'
|
938 |
else
|
939 |
Result := 'Select * From ' + QuoteIdentifierIfNeeded(FAttachment.GetSQLDialect,aProcName);
|
940 |
2:
|
941 |
if arglist <> '' then
|
942 |
Result := 'Execute Procedure ' + QuoteIdentifierIfNeeded(FAttachment.GetSQLDialect,aProcName) + '(' + arglist + ')'
|
943 |
else
|
944 |
Result := 'Execute Procedure ' + QuoteIdentifierIfNeeded(FAttachment.GetSQLDialect,aProcName);
|
945 |
else
|
946 |
raise Exception.CreateFmt('Unknown Procedure Type %d for %s',[ProcType,aProcName]);
|
947 |
|
948 |
end;
|
949 |
end;
|
950 |
|
951 |
procedure TFBUdrPluginEmulator.SetAttachment(AValue: IAttachment);
|
952 |
begin
|
953 |
if FAttachment = AValue then Exit;
|
954 |
if (AValue = nil) or (AValue.getFirebirdAPI = nil) or not AValue.getFirebirdAPI.HasMasterIntf then
|
955 |
raise Exception.Create(SNoMasterInterface);
|
956 |
FAttachment := AValue;
|
957 |
end;
|
958 |
|
959 |
function TFBUdrPluginEmulator.makeFunction(aFunctionName, aPackageName,
|
960 |
aEntryPoint: AnsiString): TExternalFunctionWrapper;
|
961 |
var index: integer;
|
962 |
aTransaction: ITransaction;
|
963 |
aModuleName,aRoutineName,aInfo: AnsiString;
|
964 |
begin
|
965 |
Result := nil;
|
966 |
if FAttachment = nil then
|
967 |
raise Exception.Create(SNoAttachment);
|
968 |
TFBUDRRoutineMetadata.ParseEntryPoint(aEntryPoint,aModuleName,aRoutineName,aInfo);
|
969 |
index := FFunctionFactories.IndexOf(aRoutineName);
|
970 |
if (index <> -1) and (FFunctionFactories.Objects[index] <> nil) then
|
971 |
begin
|
972 |
aTransaction := FAttachment.StartTransaction([isc_tpb_read,isc_tpb_nowait,isc_tpb_concurrency],taRollback);
|
973 |
Result := TExternalFunctionWrapper.Create(self,aFunctionName, aPackageName, aEntryPoint,
|
974 |
FFunctionFactories.Objects[index] as TFBUDRFunctionFactory,
|
975 |
FAttachment.PrepareWithNamedParameters(aTransaction,
|
976 |
CreateSelectFunctionSQL(aFunctionName),
|
977 |
true));
|
978 |
end;
|
979 |
end;
|
980 |
|
981 |
function TFBUdrPluginEmulator.makeProcedure(aProcName, aPackageName,
|
982 |
aEntryPoint: AnsiString): TExternalProcedureWrapper;
|
983 |
var index: integer;
|
984 |
aTransaction: ITransaction;
|
985 |
aModuleName,aRoutineName,aInfo: AnsiString;
|
986 |
begin
|
987 |
Result := nil;
|
988 |
if FAttachment = nil then
|
989 |
raise Exception.Create(SNoAttachment);
|
990 |
TFBUDRRoutineMetadata.ParseEntryPoint(aEntryPoint,aModuleName,aRoutineName,aInfo);
|
991 |
index := FProcedureFactories.IndexOf(aRoutineName);
|
992 |
if (index <> -1) and (FProcedureFactories.Objects[index] <> nil) then
|
993 |
begin
|
994 |
aTransaction := FAttachment.StartTransaction([isc_tpb_read,isc_tpb_nowait,isc_tpb_concurrency],taRollback);
|
995 |
Result := TExternalProcedureWrapper.Create(self,aProcName, aPackageName, aEntryPoint,
|
996 |
FProcedureFactories.Objects[index] as TFBUDRProcedureFactory,
|
997 |
FAttachment.PrepareWithNamedParameters(aTransaction,
|
998 |
CreateExecProcedureSQL(aProcName),true));
|
999 |
end;
|
1000 |
end;
|
1001 |
|
1002 |
function TFBUdrPluginEmulator.makeTrigger(aName, aEntryPoint,
|
1003 |
datasetName: AnsiString; aTriggerType: cardinal): TExternalTriggerWrapper;
|
1004 |
var index: integer;
|
1005 |
aTransaction: ITransaction;
|
1006 |
sql: AnsiString;
|
1007 |
aModuleName,aRoutineName,aInfo: AnsiString;
|
1008 |
begin
|
1009 |
Result := nil;
|
1010 |
sql := 'Select * from ' + datasetName;
|
1011 |
if FAttachment = nil then
|
1012 |
raise Exception.Create(SNoAttachment);
|
1013 |
TFBUDRRoutineMetadata.ParseEntryPoint(aEntryPoint,aModuleName,aRoutineName,aInfo);
|
1014 |
index := FTriggerFactories.IndexOf(aRoutineName);
|
1015 |
if (index <> -1) and (FTriggerFactories.Objects[index] <> nil) then
|
1016 |
begin
|
1017 |
aTransaction := FAttachment.StartTransaction([isc_tpb_read,isc_tpb_nowait,isc_tpb_concurrency],taRollback);
|
1018 |
Result := TExternalTriggerWrapper.Create(self,aName, datasetName, aEntryPoint, aTriggerType,
|
1019 |
FTriggerFactories.Objects[index] as TFBUDRTriggerFactory,
|
1020 |
FAttachment.PrepareWithNamedParameters(aTransaction,sql,true));
|
1021 |
end;
|
1022 |
end;
|
1023 |
|
1024 |
end.
|
1025 |
|