fbintf/client/FBStatement.pas

(*
 *  Firebird Interface (fbintf). The fbintf components provide a set of
 *  Pascal language bindings for the Firebird API. Although predominantly
 *  a new development they include source code taken from IBX and may be
 *  considered a derived product. This software thus also includes the copyright
 *  notice and license conditions from IBX.
 *
 *  Except for those parts dervied from IBX, contents of this file are subject
 *  to the Initial Developer's Public License Version 1.0 (the "License"); you
 *  may not use this file except in compliance with the License. You may obtain a
 *  copy of the License here:
 *
 *    http://www.firebirdsql.org/index.php?op=doc&id=idpl
 *
 *  Software distributed under the License is distributed on an "AS
 *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 *  implied. See the License for the specific language governing rights
 *  and limitations under the License.
 *
 *  The Initial Developer of the Original Code is Tony Whyman.
 *
 *  The Original Code is (C) 2016 Tony Whyman, MWA Software
 *  (http://www.mwasoftware.co.uk).
 *
 *  All Rights Reserved.
 *
 *  Contributor(s): ______________________________________.
 *
*)
unit FBStatement;
{$IFDEF MSWINDOWS} 
{$DEFINE WINDOWS} 
{$ENDIF}

{$IFDEF FPC}
{$mode delphi}
{$codepage UTF8}
{$interfaces COM}
{$ENDIF}

interface

uses
  Classes, SysUtils,  IB,  FBClientAPI, FBSQLData, FBOutputBlock, FBActivityMonitor,
  FBTransaction;

const
  DefaultBatchRowLimit = 1000;

type
  TPerfStatistics = array[psCurrentMemory..psFetches] of Int64;

  { TFBStatement }

  TFBStatement = class(TActivityReporter,ITransactionUser)
  private
    FAttachmentIntf: IAttachment;
    FFirebirdClientAPI: TFBClientAPI;
  protected
    FTransactionIntf: ITransaction;
    FExecTransactionIntf: ITransaction;
    FStaleReferenceChecks: boolean;
    FSQLStatementType: TIBSQLStatementTypes;         { Select, update, delete, insert, create, alter, etc...}
    FSQLDialect: integer;
    FOpen: boolean;
    FPrepared: boolean;
    FPrepareSeqNo: integer; {used to check for out of date references from interfaces}
    FSQL: AnsiString;
    FProcessedSQL: AnsiString;
    FHasParamNames: boolean;
    FBOF: boolean;
    FEOF: boolean;
    FSingleResults: boolean;
    FGenerateParamNames: boolean;
    FChangeSeqNo: integer;
    FCollectStatistics: boolean;
    FStatisticsAvailable: boolean;
    FBeforeStats: TPerfStatistics;
    FAfterStats: TPerfStatistics;
    FCaseSensitiveParams: boolean;
    FBatchRowLimit: integer;
    procedure CheckChangeBatchRowLimit; virtual;
    procedure CheckHandle; virtual; abstract;
    procedure CheckTransaction(aTransaction: ITransaction);
    procedure GetDsqlInfo(info_request: byte; buffer: ISQLInfoResults); overload; virtual; abstract;
    procedure InternalPrepare(CursorName: AnsiString='');  virtual; abstract;
    function InternalExecute(Transaction: ITransaction): IResults;  virtual; abstract;
    function InternalOpenCursor(aTransaction: ITransaction; Scrollable: boolean): IResultSet;   virtual; abstract;
    procedure ProcessSQL(sql: AnsiString; GenerateParamNames: boolean; var processedSQL: AnsiString); virtual; abstract;
    procedure FreeHandle;  virtual; abstract;
    procedure InternalClose(Force: boolean); virtual; abstract;
    function TimeStampToMSecs(const TimeStamp: TTimeStamp): Int64;
  public
    constructor Create(Attachment: IAttachment; Transaction: ITransaction;
      sql: AnsiString; SQLDialect: integer);
    constructor CreateWithParameterNames(Attachment: IAttachment; Transaction: ITransaction;
      sql: AnsiString;  SQLDialect: integer; GenerateParamNames: boolean =false;
      CaseSensitiveParams: boolean = false);
    destructor Destroy; override;
    procedure Close;
    procedure TransactionEnding(aTransaction: ITransaction; Force: boolean);
    property SQLDialect: integer read FSQLDialect;
    property FirebirdClientAPI: TFBClientAPI read FFirebirdClientAPI;

  public
    function GetSQLParams: ISQLParams; virtual; abstract;
    function GetMetaData: IMetaData;  virtual; abstract;
    function GetRowsAffected(var SelectCount, InsertCount, UpdateCount,
      DeleteCount: integer): boolean;
    function GetSQLStatementType: TIBSQLStatementTypes;
    function GetSQLStatementTypeName: AnsiString;
    function GetSQLText: AnsiString;
    function GetProcessedSQLText: AnsiString;
    function GetSQLDialect: integer;
    function GetFlags: TStatementFlags; virtual;

    {GetDSQLInfo only supports isc_info_sql_stmt_type, isc_info_sql_get_plan, isc_info_sql_records}
    procedure Prepare(aTransaction: ITransaction=nil);  overload;
    procedure Prepare(CursorName: AnsiString; aTransaction: ITransaction=nil); overload; virtual;
    function Execute(aTransaction: ITransaction=nil): IResults;
    function OpenCursor(aTransaction: ITransaction=nil): IResultSet; overload;
    function OpenCursor(Scrollable: boolean; aTransaction: ITransaction=nil): IResultSet; overload;
    function CreateBlob(paramName: AnsiString): IBlob; overload;
    function CreateBlob(index: integer): IBlob; overload;
    function CreateBlob(column: TColumnMetaData): IBlob; overload; virtual; abstract;
    function CreateArray(paramName: AnsiString): IArray; overload;
    function CreateArray(index: integer): IArray;  overload;
    function CreateArray(column: TColumnMetaData): IArray; overload; virtual; abstract;
    function GetAttachment: IAttachment;
    function GetTransaction: ITransaction;
    function GetDSQLInfo(Request: byte): ISQLInfoResults; overload;
    procedure SetRetainInterfaces(aValue: boolean); virtual;
    procedure EnableStatistics(aValue: boolean);
    function GetPerfStatistics(var stats: TPerfCounters): boolean;
    function IsInBatchMode: boolean; virtual;
    function HasBatchMode: boolean; virtual;
  public
    {IBatch support}
    procedure AddToBatch; virtual;
    function ExecuteBatch(aTransaction: ITransaction): IBatchCompletion; virtual;
    procedure CancelBatch; virtual;
    function GetBatchCompletion: IBatchCompletion; virtual;
    function GetBatchRowLimit: integer;
    procedure SetBatchRowLimit(aLimit: integer);
    {Stale Reference Check}
    procedure SetStaleReferenceChecks(Enable:boolean); {default true}
    function GetStaleReferenceChecks: boolean;
  public
    property ChangeSeqNo: integer read FChangeSeqNo;
    property SQLParams: ISQLParams read GetSQLParams;
    property SQLStatementType: TIBSQLStatementTypes read GetSQLStatementType;
end;

implementation

uses FBMessages;

{ TFBStatement }

procedure TFBStatement.CheckChangeBatchRowLimit;
begin
  //Do Nothing
end;

procedure TFBStatement.CheckTransaction(aTransaction: ITransaction);
begin
  if (aTransaction = nil) then
    IBError(ibxeTransactionNotAssigned,[]);

  if not aTransaction.InTransaction then
    IBError(ibxeNotInTransaction,[]);
end;

function TFBStatement.TimeStampToMSecs(const TimeStamp: TTimeStamp): Int64;
begin
  Result := TimeStamp.Time + Int64(timestamp.date)*msecsperday;
end;

constructor TFBStatement.Create(Attachment: IAttachment;
  Transaction: ITransaction; sql: AnsiString; SQLDialect: integer);
begin
  inherited Create(Transaction as TFBTransaction,2);
  FAttachmentIntf := Attachment;
  FTransactionIntf := Transaction;
  FFirebirdClientAPI := Attachment.getFirebirdAPI as TFBClientAPI;
  FSQLDialect := SQLDialect;
  FSQL := sql;
  FBatchRowLimit := DefaultBatchRowLimit;
  FStaleReferenceChecks := true;
end;

constructor TFBStatement.CreateWithParameterNames(Attachment: IAttachment;
  Transaction: ITransaction; sql: AnsiString; SQLDialect: integer;
  GenerateParamNames: boolean; CaseSensitiveParams: boolean);
begin
  FHasParamNames := true;
  FGenerateParamNames := GenerateParamNames;
  FCaseSensitiveParams := CaseSensitiveParams;
  Create(Attachment,Transaction,sql,SQLDialect);
end;

destructor TFBStatement.Destroy;
begin
  Close;
  FreeHandle;
  inherited Destroy;
end;

procedure TFBStatement.Close;
begin
  InternalClose(false);
end;

procedure TFBStatement.TransactionEnding(aTransaction: ITransaction;
  Force: boolean);
begin
  if FOpen and ((FExecTransactionIntf as TObject) = (aTransaction as TObject)) then
    InternalClose(Force);

  if FTransactionIntf = aTransaction then
  begin
    FreeHandle;
    FPrepared := false;
  end;
end;

function TFBStatement.GetRowsAffected(var SelectCount, InsertCount,
  UpdateCount, DeleteCount: integer): boolean;
var
  RB: ISQLInfoResults;
  i, j: integer;
begin
  InsertCount := 0;
  UpdateCount := 0;
  DeleteCount := 0;
  Result := FPrepared;
  if not Result then Exit;

  RB := GetDsqlInfo(isc_info_sql_records);

  for i := 0 to RB.Count - 1 do
  with RB[i] do
  case getItemType of
  isc_info_sql_records:
    for j := 0 to Count -1 do
    with Items[j] do
    case getItemType of
    isc_info_req_select_count:
      SelectCount := GetAsInteger;
    isc_info_req_insert_count:
      InsertCount := GetAsInteger;
    isc_info_req_update_count:
      UpdateCount := GetAsInteger;
    isc_info_req_delete_count:
      DeleteCount := GetAsInteger;
    end;
  end;
end;

function TFBStatement.GetSQLStatementType: TIBSQLStatementTypes;
begin
  Result := FSQLStatementType;
end;

function TFBStatement.GetSQLStatementTypeName: AnsiString;
begin
  case FSQLStatementType of
  SQLUnknown: Result := 'SQL_Unknown';
  SQLSelect: Result := 'SQL_Select';
  SQLInsert: Result := 'SQL_Insert';
  SQLUpdate: Result := 'SQL_Update';
  SQLDelete: Result := 'SQL_Delete';
  SQLDDL: Result := 'SQL_DDL';
  SQLGetSegment: Result := 'SQL_GetSegment';
  SQLPutSegment: Result := 'SQL_PutSegment';
  SQLExecProcedure: Result := 'SQL_ExecProcedure';
  SQLStartTransaction: Result := 'SQL_StartTransaction';
  SQLCommit: Result := 'SQL_Commit';
  SQLRollback: Result := 'SQL_Rollback';
  SQLSelectForUpdate: Result := 'SQL_SelectForUpdate';
  SQLSetGenerator: Result := 'SQL_SetGenerator';
  SQLSavePoint: Result := 'SQL_SavePoint';
  end;
end;

function TFBStatement.GetSQLText: AnsiString;
begin
  Result := FSQL;
end;

function TFBStatement.GetProcessedSQLText: AnsiString;
begin
  if not FHasParamNames then
    Result := FSQL
  else
  begin
    if FProcessedSQL = '' then
      ProcessSQL(FSQL,FGenerateParamNames,FProcessedSQL);
    Result := FProcessedSQL;
  end;
end;

function TFBStatement.GetSQLDialect: integer;
begin
  Result := FSQLDialect;
end;

function TFBStatement.GetFlags: TStatementFlags;
begin
  Result := [];
end;

procedure TFBStatement.Prepare(aTransaction: ITransaction);
begin
  Prepare('',aTransaction);
end;

procedure TFBStatement.Prepare(CursorName: AnsiString;
  aTransaction: ITransaction);
begin
  if FPrepared then FreeHandle;
  if aTransaction <> nil then
  begin
    RemoveMonitor(FTransactionIntf as TFBTransaction);
    FTransactionIntf := aTransaction;
    AddMonitor(FTransactionIntf as TFBTransaction);
  end;
  InternalPrepare(CursorName);
end;

function TFBStatement.Execute(aTransaction: ITransaction): IResults;
begin
  if aTransaction = nil then
    Result :=  InternalExecute(FTransactionIntf)
  else
    Result := InternalExecute(aTransaction);
end;

procedure TFBStatement.AddToBatch;
begin
  IBError(ibxeBatchModeNotSupported,[]);
end;

function TFBStatement.ExecuteBatch(aTransaction: ITransaction
  ): IBatchCompletion;
begin
  IBError(ibxeBatchModeNotSupported,[]);
end;

procedure TFBStatement.CancelBatch;
begin
  IBError(ibxeBatchModeNotSupported,[]);
end;

function TFBStatement.GetBatchCompletion: IBatchCompletion;
begin
  IBError(ibxeBatchModeNotSupported,[]);
end;

function TFBStatement.GetBatchRowLimit: integer;
begin
  Result := FBatchRowLimit;
end;

procedure TFBStatement.SetBatchRowLimit(aLimit: integer);
begin
  CheckChangeBatchRowLimit;
  FBatchRowLimit := aLimit;
end;

procedure TFBStatement.SetStaleReferenceChecks(Enable: boolean);
begin
  FStaleReferenceChecks := Enable;
end;

function TFBStatement.GetStaleReferenceChecks: boolean;
begin
  Result := FStaleReferenceChecks;
end;

function TFBStatement.OpenCursor(aTransaction: ITransaction): IResultSet;
begin
  Result := OpenCursor(false,aTransaction);
end;

function TFBStatement.OpenCursor(Scrollable: boolean; aTransaction: ITransaction
  ): IResultSet;
begin
  Close;
  if aTransaction = nil then
    Result := InternalOpenCursor(FTransactionIntf,Scrollable)
  else
    Result := InternalOpenCursor(aTransaction,Scrollable);
end;

function TFBStatement.CreateBlob(paramName: AnsiString): IBlob;
var column: TColumnMetaData;
begin
  InternalPrepare;
  column := SQLParams.ByName(paramName) as TSQLParam;
  if column = nil then
    IBError(ibxeFieldNotFound,[paramName]);
  Result := CreateBlob(column);
end;

function TFBStatement.CreateBlob(index: integer): IBlob;
begin
  InternalPrepare;
  Result := CreateBlob(SQLParams[index] as TSQLParam);
end;

function TFBStatement.CreateArray(paramName: AnsiString): IArray;
var column: TColumnMetaData;
begin
  InternalPrepare;
  column := SQLParams.ByName(paramName) as TSQLParam;
  if column = nil then
    IBError(ibxeFieldNotFound,[paramName]);
  Result := CreateArray(column);
end;

function TFBStatement.CreateArray(index: integer): IArray;
begin
  InternalPrepare;
  Result := CreateArray(SQLParams[index] as TSQLParam);
end;

function TFBStatement.GetAttachment: IAttachment;
begin
  Result := FAttachmentIntf;
end;

function TFBStatement.GetTransaction: ITransaction;
begin
  Result := FTransactionIntf
end;

function TFBStatement.GetDSQLInfo(Request: byte): ISQLInfoResults;
begin
  Result := TSQLInfoResultsBuffer.Create(FFirebirdClientAPI);
  GetDsqlInfo(Request,Result);
end;

procedure TFBStatement.SetRetainInterfaces(aValue: boolean);
begin
  RetainInterfaces := aValue;
end;

procedure TFBStatement.EnableStatistics(aValue: boolean);
begin
  if FCollectStatistics <> aValue then
  begin
    FCollectStatistics := aValue;
    FStatisticsAvailable := false;
  end;
end;

function TFBStatement.GetPerfStatistics(var stats: TPerfCounters): boolean;
begin
  Result := FStatisticsAvailable;
  if Result then
  begin
    stats[psCurrentMemory] := FAfterStats[psCurrentMemory];
    stats[psDeltaMemory] := FAfterStats[psCurrentMemory] - FBeforeStats[psCurrentMemory];
    stats[psMaxMemory] := FAfterStats[psMaxMemory];
    stats[psRealTime] :=  FAfterStats[psRealTime] - FBeforeStats[psRealTime];
    stats[psUserTime] :=  FAfterStats[psUserTime] - FBeforeStats[psUserTime];
    stats[psReads] := FAfterStats[psReads] - FBeforeStats[psReads];
    stats[psWrites] := FAfterStats[psWrites] - FBeforeStats[psWrites];
    stats[psFetches] := FAfterStats[psFetches] - FBeforeStats[psFetches];
    stats[psBuffers] :=  FAfterStats[psBuffers];
  end;
end;

function TFBStatement.IsInBatchMode: boolean;
begin
  Result := false;
end;

function TFBStatement.HasBatchMode: boolean;
begin
  Result := false;
end;

end.

Revision:	359
Committed:	Tue Dec 7 09:37:32 2021 UTC (2 years, 4 months ago) by tony
Content type:	text/x-pascal
Original Path:	*ibx/trunk/fbintf/client/FBStatement.pas*
File size:	14777 byte(s)
Log Message:	Fixes Merged
#	User	Rev	Content
1	tony	45	(*
2			* Firebird Interface (fbintf). The fbintf components provide a set of
3			* Pascal language bindings for the Firebird API. Although predominantly
4			* a new development they include source code taken from IBX and may be
5			* considered a derived product. This software thus also includes the copyright
6			* notice and license conditions from IBX.
7			*
8			* Except for those parts dervied from IBX, contents of this file are subject
9			* to the Initial Developer's Public License Version 1.0 (the "License"); you
10			* may not use this file except in compliance with the License. You may obtain a
11			* copy of the License here:
12			*
13			* http://www.firebirdsql.org/index.php?op=doc&id=idpl
14			*
15			* Software distributed under the License is distributed on an "AS
16			* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
17			* implied. See the License for the specific language governing rights
18			* and limitations under the License.
19			*
20			* The Initial Developer of the Original Code is Tony Whyman.
21			*
22			* The Original Code is (C) 2016 Tony Whyman, MWA Software
23			* (http://www.mwasoftware.co.uk).
24			*
25			* All Rights Reserved.
26			*
27			* Contributor(s): ______________________________________.
28			*
29			*)
30			unit FBStatement;
31	tony	56	{$IFDEF MSWINDOWS}
32			{$DEFINE WINDOWS}
33			{$ENDIF}
34	tony	45
35			{$IFDEF FPC}
36	tony	56	{$mode delphi}
37	tony	45	{$codepage UTF8}
38			{$interfaces COM}
39			{$ENDIF}
40
41			interface
42
43			uses
44			Classes, SysUtils, IB, FBClientAPI, FBSQLData, FBOutputBlock, FBActivityMonitor,
45			FBTransaction;
46
47	tony	345	const
48			DefaultBatchRowLimit = 1000;
49
50	tony	45	type
51	tony	209	TPerfStatistics = array[psCurrentMemory..psFetches] of Int64;
52	tony	45
53			{ TFBStatement }
54
55	tony	315	TFBStatement = class(TActivityReporter,ITransactionUser)
56	tony	45	private
57			FAttachmentIntf: IAttachment;
58	tony	263	FFirebirdClientAPI: TFBClientAPI;
59	tony	45	protected
60			FTransactionIntf: ITransaction;
61			FExecTransactionIntf: ITransaction;
62	tony	347	FStaleReferenceChecks: boolean;
63	tony	45	FSQLStatementType: TIBSQLStatementTypes; { Select, update, delete, insert, create, alter, etc...}
64			FSQLDialect: integer;
65			FOpen: boolean;
66			FPrepared: boolean;
67			FPrepareSeqNo: integer; {used to check for out of date references from interfaces}
68	tony	56	FSQL: AnsiString;
69			FProcessedSQL: AnsiString;
70	tony	45	FHasParamNames: boolean;
71			FBOF: boolean;
72			FEOF: boolean;
73			FSingleResults: boolean;
74			FGenerateParamNames: boolean;
75			FChangeSeqNo: integer;
76	tony	47	FCollectStatistics: boolean;
77			FStatisticsAvailable: boolean;
78			FBeforeStats: TPerfStatistics;
79			FAfterStats: TPerfStatistics;
80	tony	270	FCaseSensitiveParams: boolean;
81	tony	345	FBatchRowLimit: integer;
82			procedure CheckChangeBatchRowLimit; virtual;
83	tony	45	procedure CheckHandle; virtual; abstract;
84			procedure CheckTransaction(aTransaction: ITransaction);
85			procedure GetDsqlInfo(info_request: byte; buffer: ISQLInfoResults); overload; virtual; abstract;
86	tony	350	procedure InternalPrepare(CursorName: AnsiString=''); virtual; abstract;
87	tony	345	function InternalExecute(Transaction: ITransaction): IResults; virtual; abstract;
88	tony	350	function InternalOpenCursor(aTransaction: ITransaction; Scrollable: boolean): IResultSet; virtual; abstract;
89	tony	263	procedure ProcessSQL(sql: AnsiString; GenerateParamNames: boolean; var processedSQL: AnsiString); virtual; abstract;
90	tony	45	procedure FreeHandle; virtual; abstract;
91			procedure InternalClose(Force: boolean); virtual; abstract;
92	tony	209	function TimeStampToMSecs(const TimeStamp: TTimeStamp): Int64;
93	tony	45	public
94			constructor Create(Attachment: IAttachment; Transaction: ITransaction;
95	tony	56	sql: AnsiString; SQLDialect: integer);
96	tony	45	constructor CreateWithParameterNames(Attachment: IAttachment; Transaction: ITransaction;
97	tony	270	sql: AnsiString; SQLDialect: integer; GenerateParamNames: boolean =false;
98			CaseSensitiveParams: boolean = false);
99	tony	45	destructor Destroy; override;
100			procedure Close;
101			procedure TransactionEnding(aTransaction: ITransaction; Force: boolean);
102			property SQLDialect: integer read FSQLDialect;
103	tony	263	property FirebirdClientAPI: TFBClientAPI read FFirebirdClientAPI;
104	tony	45
105			public
106			function GetSQLParams: ISQLParams; virtual; abstract;
107			function GetMetaData: IMetaData; virtual; abstract;
108			function GetRowsAffected(var SelectCount, InsertCount, UpdateCount,
109			DeleteCount: integer): boolean;
110			function GetSQLStatementType: TIBSQLStatementTypes;
111	tony	345	function GetSQLStatementTypeName: AnsiString;
112	tony	56	function GetSQLText: AnsiString;
113	tony	263	function GetProcessedSQLText: AnsiString;
114	tony	45	function GetSQLDialect: integer;
115	tony	359	function GetFlags: TStatementFlags; virtual;
116	tony	45
117			{GetDSQLInfo only supports isc_info_sql_stmt_type, isc_info_sql_get_plan, isc_info_sql_records}
118	tony	350	procedure Prepare(aTransaction: ITransaction=nil); overload;
119			procedure Prepare(CursorName: AnsiString; aTransaction: ITransaction=nil); overload; virtual;
120	tony	45	function Execute(aTransaction: ITransaction=nil): IResults;
121	tony	350	function OpenCursor(aTransaction: ITransaction=nil): IResultSet; overload;
122			function OpenCursor(Scrollable: boolean; aTransaction: ITransaction=nil): IResultSet; overload;
123	tony	56	function CreateBlob(paramName: AnsiString): IBlob; overload;
124	tony	45	function CreateBlob(index: integer): IBlob; overload;
125			function CreateBlob(column: TColumnMetaData): IBlob; overload; virtual; abstract;
126	tony	56	function CreateArray(paramName: AnsiString): IArray; overload;
127	tony	45	function CreateArray(index: integer): IArray; overload;
128			function CreateArray(column: TColumnMetaData): IArray; overload; virtual; abstract;
129			function GetAttachment: IAttachment;
130			function GetTransaction: ITransaction;
131			function GetDSQLInfo(Request: byte): ISQLInfoResults; overload;
132			procedure SetRetainInterfaces(aValue: boolean); virtual;
133	tony	47	procedure EnableStatistics(aValue: boolean);
134			function GetPerfStatistics(var stats: TPerfCounters): boolean;
135	tony	345	function IsInBatchMode: boolean; virtual;
136			function HasBatchMode: boolean; virtual;
137			public
138			{IBatch support}
139			procedure AddToBatch; virtual;
140			function ExecuteBatch(aTransaction: ITransaction): IBatchCompletion; virtual;
141			procedure CancelBatch; virtual;
142			function GetBatchCompletion: IBatchCompletion; virtual;
143			function GetBatchRowLimit: integer;
144			procedure SetBatchRowLimit(aLimit: integer);
145	tony	347	{Stale Reference Check}
146			procedure SetStaleReferenceChecks(Enable:boolean); {default true}
147			function GetStaleReferenceChecks: boolean;
148	tony	345	public
149	tony	45	property ChangeSeqNo: integer read FChangeSeqNo;
150			property SQLParams: ISQLParams read GetSQLParams;
151			property SQLStatementType: TIBSQLStatementTypes read GetSQLStatementType;
152			end;
153
154			implementation
155
156			uses FBMessages;
157
158			{ TFBStatement }
159
160	tony	345	procedure TFBStatement.CheckChangeBatchRowLimit;
161			begin
162			//Do Nothing
163			end;
164
165	tony	45	procedure TFBStatement.CheckTransaction(aTransaction: ITransaction);
166			begin
167			if (aTransaction = nil) then
168			IBError(ibxeTransactionNotAssigned,[]);
169
170			if not aTransaction.InTransaction then
171			IBError(ibxeNotInTransaction,[]);
172			end;
173
174	tony	209	function TFBStatement.TimeStampToMSecs(const TimeStamp: TTimeStamp): Int64;
175			begin
176			Result := TimeStamp.Time + Int64(timestamp.date)*msecsperday;
177			end;
178
179	tony	45	constructor TFBStatement.Create(Attachment: IAttachment;
180	tony	56	Transaction: ITransaction; sql: AnsiString; SQLDialect: integer);
181	tony	45	begin
182			inherited Create(Transaction as TFBTransaction,2);
183			FAttachmentIntf := Attachment;
184			FTransactionIntf := Transaction;
185	tony	263	FFirebirdClientAPI := Attachment.getFirebirdAPI as TFBClientAPI;
186	tony	45	FSQLDialect := SQLDialect;
187			FSQL := sql;
188	tony	345	FBatchRowLimit := DefaultBatchRowLimit;
189	tony	347	FStaleReferenceChecks := true;
190	tony	45	end;
191
192			constructor TFBStatement.CreateWithParameterNames(Attachment: IAttachment;
193	tony	56	Transaction: ITransaction; sql: AnsiString; SQLDialect: integer;
194	tony	270	GenerateParamNames: boolean; CaseSensitiveParams: boolean);
195	tony	45	begin
196			FHasParamNames := true;
197			FGenerateParamNames := GenerateParamNames;
198	tony	270	FCaseSensitiveParams := CaseSensitiveParams;
199	tony	45	Create(Attachment,Transaction,sql,SQLDialect);
200			end;
201
202			destructor TFBStatement.Destroy;
203			begin
204			Close;
205			FreeHandle;
206			inherited Destroy;
207			end;
208
209			procedure TFBStatement.Close;
210			begin
211			InternalClose(false);
212			end;
213
214			procedure TFBStatement.TransactionEnding(aTransaction: ITransaction;
215			Force: boolean);
216			begin
217	tony	315	if FOpen and ((FExecTransactionIntf as TObject) = (aTransaction as TObject)) then
218	tony	45	InternalClose(Force);
219
220			if FTransactionIntf = aTransaction then
221			begin
222			FreeHandle;
223			FPrepared := false;
224			end;
225			end;
226
227			function TFBStatement.GetRowsAffected(var SelectCount, InsertCount,
228			UpdateCount, DeleteCount: integer): boolean;
229			var
230			RB: ISQLInfoResults;
231			i, j: integer;
232			begin
233			InsertCount := 0;
234			UpdateCount := 0;
235			DeleteCount := 0;
236			Result := FPrepared;
237			if not Result then Exit;
238
239			RB := GetDsqlInfo(isc_info_sql_records);
240
241			for i := 0 to RB.Count - 1 do
242			with RB[i] do
243			case getItemType of
244			isc_info_sql_records:
245			for j := 0 to Count -1 do
246			with Items[j] do
247			case getItemType of
248			isc_info_req_select_count:
249			SelectCount := GetAsInteger;
250			isc_info_req_insert_count:
251			InsertCount := GetAsInteger;
252			isc_info_req_update_count:
253			UpdateCount := GetAsInteger;
254			isc_info_req_delete_count:
255			DeleteCount := GetAsInteger;
256			end;
257			end;
258			end;
259
260			function TFBStatement.GetSQLStatementType: TIBSQLStatementTypes;
261			begin
262			Result := FSQLStatementType;
263			end;
264
265	tony	345	function TFBStatement.GetSQLStatementTypeName: AnsiString;
266			begin
267			case FSQLStatementType of
268			SQLUnknown: Result := 'SQL_Unknown';
269			SQLSelect: Result := 'SQL_Select';
270			SQLInsert: Result := 'SQL_Insert';
271			SQLUpdate: Result := 'SQL_Update';
272			SQLDelete: Result := 'SQL_Delete';
273			SQLDDL: Result := 'SQL_DDL';
274			SQLGetSegment: Result := 'SQL_GetSegment';
275			SQLPutSegment: Result := 'SQL_PutSegment';
276			SQLExecProcedure: Result := 'SQL_ExecProcedure';
277			SQLStartTransaction: Result := 'SQL_StartTransaction';
278			SQLCommit: Result := 'SQL_Commit';
279			SQLRollback: Result := 'SQL_Rollback';
280			SQLSelectForUpdate: Result := 'SQL_SelectForUpdate';
281			SQLSetGenerator: Result := 'SQL_SetGenerator';
282			SQLSavePoint: Result := 'SQL_SavePoint';
283			end;
284			end;
285
286	tony	56	function TFBStatement.GetSQLText: AnsiString;
287	tony	45	begin
288			Result := FSQL;
289			end;
290
291	tony	263	function TFBStatement.GetProcessedSQLText: AnsiString;
292			begin
293	tony	359	if not FHasParamNames then
294			Result := FSQL
295			else
296			begin
297			if FProcessedSQL = '' then
298			ProcessSQL(FSQL,FGenerateParamNames,FProcessedSQL);
299			Result := FProcessedSQL;
300			end;
301	tony	263	end;
302
303	tony	45	function TFBStatement.GetSQLDialect: integer;
304			begin
305			Result := FSQLDialect;
306			end;
307
308	tony	359	function TFBStatement.GetFlags: TStatementFlags;
309			begin
310			Result := [];
311			end;
312
313	tony	45	procedure TFBStatement.Prepare(aTransaction: ITransaction);
314			begin
315	tony	350	Prepare('',aTransaction);
316			end;
317
318			procedure TFBStatement.Prepare(CursorName: AnsiString;
319			aTransaction: ITransaction);
320			begin
321	tony	45	if FPrepared then FreeHandle;
322			if aTransaction <> nil then
323			begin
324			RemoveMonitor(FTransactionIntf as TFBTransaction);
325			FTransactionIntf := aTransaction;
326			AddMonitor(FTransactionIntf as TFBTransaction);
327			end;
328	tony	350	InternalPrepare(CursorName);
329	tony	45	end;
330
331			function TFBStatement.Execute(aTransaction: ITransaction): IResults;
332			begin
333			if aTransaction = nil then
334			Result := InternalExecute(FTransactionIntf)
335			else
336			Result := InternalExecute(aTransaction);
337			end;
338
339	tony	345	procedure TFBStatement.AddToBatch;
340			begin
341			IBError(ibxeBatchModeNotSupported,[]);
342			end;
343
344			function TFBStatement.ExecuteBatch(aTransaction: ITransaction
345			): IBatchCompletion;
346			begin
347			IBError(ibxeBatchModeNotSupported,[]);
348			end;
349
350			procedure TFBStatement.CancelBatch;
351			begin
352			IBError(ibxeBatchModeNotSupported,[]);
353			end;
354
355			function TFBStatement.GetBatchCompletion: IBatchCompletion;
356			begin
357			IBError(ibxeBatchModeNotSupported,[]);
358			end;
359
360			function TFBStatement.GetBatchRowLimit: integer;
361			begin
362			Result := FBatchRowLimit;
363			end;
364
365			procedure TFBStatement.SetBatchRowLimit(aLimit: integer);
366			begin
367			CheckChangeBatchRowLimit;
368			FBatchRowLimit := aLimit;
369			end;
370
371	tony	347	procedure TFBStatement.SetStaleReferenceChecks(Enable: boolean);
372			begin
373			FStaleReferenceChecks := Enable;
374			end;
375
376			function TFBStatement.GetStaleReferenceChecks: boolean;
377			begin
378			Result := FStaleReferenceChecks;
379			end;
380
381	tony	45	function TFBStatement.OpenCursor(aTransaction: ITransaction): IResultSet;
382			begin
383	tony	350	Result := OpenCursor(false,aTransaction);
384			end;
385
386			function TFBStatement.OpenCursor(Scrollable: boolean; aTransaction: ITransaction
387			): IResultSet;
388			begin
389	tony	45	Close;
390			if aTransaction = nil then
391	tony	350	Result := InternalOpenCursor(FTransactionIntf,Scrollable)
392	tony	45	else
393	tony	350	Result := InternalOpenCursor(aTransaction,Scrollable);
394	tony	45	end;
395
396	tony	56	function TFBStatement.CreateBlob(paramName: AnsiString): IBlob;
397	tony	45	var column: TColumnMetaData;
398			begin
399			InternalPrepare;
400			column := SQLParams.ByName(paramName) as TSQLParam;
401			if column = nil then
402			IBError(ibxeFieldNotFound,[paramName]);
403			Result := CreateBlob(column);
404			end;
405
406			function TFBStatement.CreateBlob(index: integer): IBlob;
407			begin
408			InternalPrepare;
409			Result := CreateBlob(SQLParams[index] as TSQLParam);
410			end;
411
412	tony	56	function TFBStatement.CreateArray(paramName: AnsiString): IArray;
413	tony	45	var column: TColumnMetaData;
414			begin
415			InternalPrepare;
416			column := SQLParams.ByName(paramName) as TSQLParam;
417			if column = nil then
418			IBError(ibxeFieldNotFound,[paramName]);
419			Result := CreateArray(column);
420			end;
421
422			function TFBStatement.CreateArray(index: integer): IArray;
423			begin
424			InternalPrepare;
425			Result := CreateArray(SQLParams[index] as TSQLParam);
426			end;
427
428			function TFBStatement.GetAttachment: IAttachment;
429			begin
430			Result := FAttachmentIntf;
431			end;
432
433			function TFBStatement.GetTransaction: ITransaction;
434			begin
435			Result := FTransactionIntf
436			end;
437
438			function TFBStatement.GetDSQLInfo(Request: byte): ISQLInfoResults;
439			begin
440	tony	263	Result := TSQLInfoResultsBuffer.Create(FFirebirdClientAPI);
441	tony	45	GetDsqlInfo(Request,Result);
442			end;
443
444			procedure TFBStatement.SetRetainInterfaces(aValue: boolean);
445			begin
446			RetainInterfaces := aValue;
447			end;
448
449	tony	47	procedure TFBStatement.EnableStatistics(aValue: boolean);
450			begin
451			if FCollectStatistics <> aValue then
452			begin
453			FCollectStatistics := aValue;
454			FStatisticsAvailable := false;
455			end;
456			end;
457
458			function TFBStatement.GetPerfStatistics(var stats: TPerfCounters): boolean;
459			begin
460			Result := FStatisticsAvailable;
461			if Result then
462			begin
463			stats[psCurrentMemory] := FAfterStats[psCurrentMemory];
464			stats[psDeltaMemory] := FAfterStats[psCurrentMemory] - FBeforeStats[psCurrentMemory];
465			stats[psMaxMemory] := FAfterStats[psMaxMemory];
466			stats[psRealTime] := FAfterStats[psRealTime] - FBeforeStats[psRealTime];
467			stats[psUserTime] := FAfterStats[psUserTime] - FBeforeStats[psUserTime];
468			stats[psReads] := FAfterStats[psReads] - FBeforeStats[psReads];
469			stats[psWrites] := FAfterStats[psWrites] - FBeforeStats[psWrites];
470			stats[psFetches] := FAfterStats[psFetches] - FBeforeStats[psFetches];
471			stats[psBuffers] := FAfterStats[psBuffers];
472			end;
473			end;
474
475	tony	345	function TFBStatement.IsInBatchMode: boolean;
476			begin
477			Result := false;
478			end;
479
480			function TFBStatement.HasBatchMode: boolean;
481			begin
482			Result := false;
483			end;
484
485	tony	45	end.
486