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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. Although predominantly
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* a new development they include source code taken from IBX and may be
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* considered a derived product. This software thus also includes the copyright
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* notice and license conditions from IBX.
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*
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* Except for those parts dervied from IBX, contents of this file are subject
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* to the Initial Developer's Public License Version 1.0 (the "License"); you
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* may not use this file except in compliance with the License. You may obtain a
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* copy 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 FBStatement;
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{$IFDEF FPC}
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{$mode objfpc}{$H+}
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{$codepage UTF8}
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{$interfaces COM}
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{$ENDIF}
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interface
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uses
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Classes, SysUtils, IB, FBClientAPI, FBSQLData, FBOutputBlock, FBActivityMonitor,
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FBTransaction;
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type
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{ TFBStatement }
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TFBStatement = class(TActivityReporter)
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private
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FAttachmentIntf: IAttachment;
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protected
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FTransactionIntf: ITransaction;
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FExecTransactionIntf: ITransaction;
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FSQLStatementType: TIBSQLStatementTypes; { Select, update, delete, insert, create, alter, etc...}
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FSQLDialect: integer;
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FOpen: boolean;
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FPrepared: boolean;
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FPrepareSeqNo: integer; {used to check for out of date references from interfaces}
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FSQL: string;
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FProcessedSQL: string;
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FHasParamNames: boolean;
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FBOF: boolean;
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FEOF: boolean;
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FSingleResults: boolean;
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FGenerateParamNames: boolean;
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FChangeSeqNo: integer;
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procedure CheckHandle; virtual; abstract;
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procedure CheckTransaction(aTransaction: ITransaction);
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procedure GetDsqlInfo(info_request: byte; buffer: ISQLInfoResults); overload; virtual; abstract;
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procedure InternalPrepare; virtual; abstract;
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function InternalExecute(aTransaction: ITransaction): IResults; virtual; abstract;
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function InternalOpenCursor(aTransaction: ITransaction): IResultSet; virtual; abstract;
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procedure FreeHandle; virtual; abstract;
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procedure InternalClose(Force: boolean); virtual; abstract;
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public
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constructor Create(Attachment: IAttachment; Transaction: ITransaction;
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sql: string; SQLDialect: integer);
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constructor CreateWithParameterNames(Attachment: IAttachment; Transaction: ITransaction;
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sql: string; SQLDialect: integer; GenerateParamNames: boolean =false);
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destructor Destroy; override;
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procedure Close;
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procedure TransactionEnding(aTransaction: ITransaction; Force: boolean);
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property SQLDialect: integer read FSQLDialect;
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public
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function GetSQLParams: ISQLParams; virtual; abstract;
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function GetMetaData: IMetaData; virtual; abstract;
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function GetRowsAffected(var SelectCount, InsertCount, UpdateCount,
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DeleteCount: integer): boolean;
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function GetSQLStatementType: TIBSQLStatementTypes;
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function GetSQLText: string;
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function GetSQLDialect: integer;
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{GetDSQLInfo only supports isc_info_sql_stmt_type, isc_info_sql_get_plan, isc_info_sql_records}
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procedure Prepare(aTransaction: ITransaction=nil); virtual;
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function Execute(aTransaction: ITransaction=nil): IResults;
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function OpenCursor(aTransaction: ITransaction=nil): IResultSet;
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function CreateBlob(paramName: string): IBlob; overload;
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function CreateBlob(index: integer): IBlob; overload;
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function CreateBlob(column: TColumnMetaData): IBlob; overload; virtual; abstract;
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function CreateArray(paramName: string): IArray; overload;
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function CreateArray(index: integer): IArray; overload;
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function CreateArray(column: TColumnMetaData): IArray; overload; virtual; abstract;
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function GetAttachment: IAttachment;
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function GetTransaction: ITransaction;
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function GetDSQLInfo(Request: byte): ISQLInfoResults; overload;
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procedure SetRetainInterfaces(aValue: boolean); virtual;
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property ChangeSeqNo: integer read FChangeSeqNo;
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property SQLParams: ISQLParams read GetSQLParams;
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property SQLStatementType: TIBSQLStatementTypes read GetSQLStatementType;
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end;
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implementation
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uses FBMessages;
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{ TFBStatement }
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procedure TFBStatement.CheckTransaction(aTransaction: ITransaction);
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begin
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if (aTransaction = nil) then
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IBError(ibxeTransactionNotAssigned,[]);
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if not aTransaction.InTransaction then
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IBError(ibxeNotInTransaction,[]);
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end;
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constructor TFBStatement.Create(Attachment: IAttachment;
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Transaction: ITransaction; sql: string; SQLDialect: integer);
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begin
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inherited Create(Transaction as TFBTransaction,2);
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FAttachmentIntf := Attachment;
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FTransactionIntf := Transaction;
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FSQLDialect := SQLDialect;
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FSQL := sql;
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end;
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constructor TFBStatement.CreateWithParameterNames(Attachment: IAttachment;
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Transaction: ITransaction; sql: string; SQLDialect: integer;
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GenerateParamNames: boolean);
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begin
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FHasParamNames := true;
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FGenerateParamNames := GenerateParamNames;
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Create(Attachment,Transaction,sql,SQLDialect);
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end;
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destructor TFBStatement.Destroy;
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begin
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Close;
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FreeHandle;
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inherited Destroy;
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end;
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procedure TFBStatement.Close;
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begin
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InternalClose(false);
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end;
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procedure TFBStatement.TransactionEnding(aTransaction: ITransaction;
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Force: boolean);
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begin
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if FOpen and (FExecTransactionIntf = aTransaction) then
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InternalClose(Force);
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if FTransactionIntf = aTransaction then
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begin
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FreeHandle;
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FPrepared := false;
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end;
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end;
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function TFBStatement.GetRowsAffected(var SelectCount, InsertCount,
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UpdateCount, DeleteCount: integer): boolean;
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var
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RB: ISQLInfoResults;
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i, j: integer;
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begin
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InsertCount := 0;
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UpdateCount := 0;
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DeleteCount := 0;
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Result := FPrepared;
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if not Result then Exit;
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RB := GetDsqlInfo(isc_info_sql_records);
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for i := 0 to RB.Count - 1 do
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with RB[i] do
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case getItemType of
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isc_info_sql_records:
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for j := 0 to Count -1 do
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with Items[j] do
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case getItemType of
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isc_info_req_select_count:
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SelectCount := GetAsInteger;
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isc_info_req_insert_count:
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InsertCount := GetAsInteger;
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isc_info_req_update_count:
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UpdateCount := GetAsInteger;
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isc_info_req_delete_count:
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DeleteCount := GetAsInteger;
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end;
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end;
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end;
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function TFBStatement.GetSQLStatementType: TIBSQLStatementTypes;
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begin
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Result := FSQLStatementType;
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end;
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function TFBStatement.GetSQLText: string;
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begin
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Result := FSQL;
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end;
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function TFBStatement.GetSQLDialect: integer;
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begin
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Result := FSQLDialect;
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end;
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procedure TFBStatement.Prepare(aTransaction: ITransaction);
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begin
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if FPrepared then FreeHandle;
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if aTransaction <> nil then
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begin
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RemoveMonitor(FTransactionIntf as TFBTransaction);
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FTransactionIntf := aTransaction;
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AddMonitor(FTransactionIntf as TFBTransaction);
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end;
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InternalPrepare;
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end;
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function TFBStatement.Execute(aTransaction: ITransaction): IResults;
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begin
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if aTransaction = nil then
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Result := InternalExecute(FTransactionIntf)
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else
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Result := InternalExecute(aTransaction);
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end;
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function TFBStatement.OpenCursor(aTransaction: ITransaction): IResultSet;
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begin
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Close;
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if aTransaction = nil then
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Result := InternalOpenCursor(FTransactionIntf)
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else
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Result := InternalOpenCursor(aTransaction);
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end;
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function TFBStatement.CreateBlob(paramName: string): IBlob;
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var column: TColumnMetaData;
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begin
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InternalPrepare;
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column := SQLParams.ByName(paramName) as TSQLParam;
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if column = nil then
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IBError(ibxeFieldNotFound,[paramName]);
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Result := CreateBlob(column);
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end;
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function TFBStatement.CreateBlob(index: integer): IBlob;
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begin
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InternalPrepare;
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Result := CreateBlob(SQLParams[index] as TSQLParam);
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end;
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function TFBStatement.CreateArray(paramName: string): IArray;
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var column: TColumnMetaData;
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begin
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InternalPrepare;
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column := SQLParams.ByName(paramName) as TSQLParam;
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if column = nil then
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IBError(ibxeFieldNotFound,[paramName]);
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Result := CreateArray(column);
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end;
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function TFBStatement.CreateArray(index: integer): IArray;
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begin
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InternalPrepare;
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Result := CreateArray(SQLParams[index] as TSQLParam);
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end;
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function TFBStatement.GetAttachment: IAttachment;
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begin
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Result := FAttachmentIntf;
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end;
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function TFBStatement.GetTransaction: ITransaction;
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begin
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Result := FTransactionIntf
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end;
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function TFBStatement.GetDSQLInfo(Request: byte): ISQLInfoResults;
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begin
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Result := TSQLInfoResultsBuffer.Create;
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GetDsqlInfo(Request,Result);
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end;
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procedure TFBStatement.SetRetainInterfaces(aValue: boolean);
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begin
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RetainInterfaces := aValue;
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end;
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end.
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