udr/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    FPrepareSeqNo: integer; {used to check for out of date references from interfaces}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 DoJournaling(force: boolean);
    function GetJournalIntf: IJournallingHook;
    function GetStatementIntf: IStatement; virtual; abstract;
    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;

procedure TFBStatement.DoJournaling(force: boolean);
  function doGetRowsAffected: integer;
  var a,i,u,d: integer;
  begin
    GetRowsAffected(a,i,u,d);
    Result := i + u + d;
  end;

var RowsAffected: integer;
begin
  RowsAffected := doGetRowsAffected;
  with GetAttachment do
    if JournalingActive and (force or
      (((joReadOnlyQueries in GetJournalOptions) and (RowsAffected = 0)) or
      ((joModifyQueries in GetJournalOptions) and (RowsAffected > 0)))) then
      GetJournalIntf.ExecQuery(GetStatementIntf);
end;

function TFBStatement.GetJournalIntf: IJournallingHook;
begin
  GetAttachment.QueryInterface(IJournallingHook,Result)
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
  try
    if aTransaction = nil then
      Result :=  InternalExecute(FTransactionIntf)
    else
      Result := InternalExecute(aTransaction);
  finally
    DoJournaling(ExceptObject <> nil);
  end;
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;
  try
    if aTransaction = nil then
      Result := InternalOpenCursor(FTransactionIntf,Scrollable)
    else
      Result := InternalOpenCursor(aTransaction,Scrollable);
  finally
    DoJournaling(ExceptObject <> nil);
  end;
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:	392
Committed:	Wed Feb 9 16:17:50 2022 UTC (2 years, 9 months ago) by tony
Content type:	text/x-pascal
File size:	15722 byte(s)
Log Message:	cloneAttachment and GetServiceManager added
#	Content
1	(*
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	{$IFDEF MSWINDOWS}
32	{$DEFINE WINDOWS}
33	{$ENDIF}
34
35	{$IFDEF FPC}
36	{$mode delphi}
37	{$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	const
48	DefaultBatchRowLimit = 1000;
49
50	type
51	TPerfStatistics = array[psCurrentMemory..psFetches] of Int64;
52
53	{ TFBStatement }
54
55	TFBStatement = class(TActivityReporter,ITransactionUser)
56	private
57	FAttachmentIntf: IAttachment;
58	FFirebirdClientAPI: TFBClientAPI;
59	protected
60	FTransactionIntf: ITransaction;
61	FExecTransactionIntf: ITransaction;
62	FStaleReferenceChecks: boolean;
63	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	FSQL: AnsiString;
69	FProcessedSQL: AnsiString;
70	FHasParamNames: boolean;
71	FBOF: boolean;
72	FEOF: boolean;
73	FSingleResults: boolean;
74	FGenerateParamNames: boolean;
75	FChangeSeqNo: integer;
76	FCollectStatistics: boolean;
77	FStatisticsAvailable: boolean;
78	FBeforeStats: TPerfStatistics;
79	FAfterStats: TPerfStatistics;
80	FCaseSensitiveParams: boolean;
81	FBatchRowLimit: integer;
82	procedure CheckChangeBatchRowLimit; virtual;
83	procedure CheckHandle; virtual; abstract;
84	procedure CheckTransaction(aTransaction: ITransaction);
85	procedure DoJournaling(force: boolean);
86	function GetJournalIntf: IJournallingHook;
87	function GetStatementIntf: IStatement; virtual; abstract;
88	procedure GetDsqlInfo(info_request: byte; buffer: ISQLInfoResults); overload; virtual; abstract;
89	procedure InternalPrepare(CursorName: AnsiString=''); virtual; abstract;
90	function InternalExecute(Transaction: ITransaction): IResults; virtual; abstract;
91	function InternalOpenCursor(aTransaction: ITransaction; Scrollable: boolean): IResultSet; virtual; abstract;
92	procedure ProcessSQL(sql: AnsiString; GenerateParamNames: boolean; var processedSQL: AnsiString); virtual; abstract;
93	procedure FreeHandle; virtual; abstract;
94	procedure InternalClose(Force: boolean); virtual; abstract;
95	function TimeStampToMSecs(const TimeStamp: TTimeStamp): Int64;
96	public
97	constructor Create(Attachment: IAttachment; Transaction: ITransaction;
98	sql: AnsiString; SQLDialect: integer);
99	constructor CreateWithParameterNames(Attachment: IAttachment; Transaction: ITransaction;
100	sql: AnsiString; SQLDialect: integer; GenerateParamNames: boolean =false;
101	CaseSensitiveParams: boolean = false);
102	destructor Destroy; override;
103	procedure Close;
104	procedure TransactionEnding(aTransaction: ITransaction; Force: boolean);
105	property SQLDialect: integer read FSQLDialect;
106	property FirebirdClientAPI: TFBClientAPI read FFirebirdClientAPI;
107
108	public
109	function GetSQLParams: ISQLParams; virtual; abstract;
110	function GetMetaData: IMetaData; virtual; abstract;
111	function GetRowsAffected(var SelectCount, InsertCount, UpdateCount,
112	DeleteCount: integer): boolean;
113	function GetSQLStatementType: TIBSQLStatementTypes;
114	function GetSQLStatementTypeName: AnsiString;
115	function GetSQLText: AnsiString;
116	function GetProcessedSQLText: AnsiString;
117	function GetSQLDialect: integer;
118	function GetFlags: TStatementFlags; virtual;
119
120	{GetDSQLInfo only supports isc_info_sql_stmt_type, isc_info_sql_get_plan, isc_info_sql_records}
121	procedure Prepare(aTransaction: ITransaction=nil); overload;
122	procedure Prepare(CursorName: AnsiString; aTransaction: ITransaction=nil); overload; virtual;
123	function Execute(aTransaction: ITransaction=nil): IResults;
124	function OpenCursor(aTransaction: ITransaction=nil): IResultSet; overload;
125	function OpenCursor(Scrollable: boolean; aTransaction: ITransaction=nil): IResultSet; overload;
126	function CreateBlob(paramName: AnsiString): IBlob; overload;
127	function CreateBlob(index: integer): IBlob; overload;
128	function CreateBlob(column: TColumnMetaData): IBlob; overload; virtual; abstract;
129	function CreateArray(paramName: AnsiString): IArray; overload;
130	function CreateArray(index: integer): IArray; overload;
131	function CreateArray(column: TColumnMetaData): IArray; overload; virtual; abstract;
132	function GetAttachment: IAttachment;
133	function GetTransaction: ITransaction;
134	function GetDSQLInfo(Request: byte): ISQLInfoResults; overload;
135	procedure SetRetainInterfaces(aValue: boolean); virtual;
136	procedure EnableStatistics(aValue: boolean);
137	function GetPerfStatistics(var stats: TPerfCounters): boolean;
138	function IsInBatchMode: boolean; virtual;
139	function HasBatchMode: boolean; virtual;
140	public
141	{IBatch support}
142	procedure AddToBatch; virtual;
143	function ExecuteBatch(aTransaction: ITransaction): IBatchCompletion; virtual;
144	procedure CancelBatch; virtual;
145	function GetBatchCompletion: IBatchCompletion; virtual;
146	function GetBatchRowLimit: integer;
147	procedure SetBatchRowLimit(aLimit: integer);
148	{Stale Reference Check}
149	procedure SetStaleReferenceChecks(Enable:boolean); {default true}
150	function GetStaleReferenceChecks: boolean;
151	public
152	property ChangeSeqNo: integer read FChangeSeqNo;
153	property SQLParams: ISQLParams read GetSQLParams;
154	property SQLStatementType: TIBSQLStatementTypes read GetSQLStatementType;
155	end;
156
157	implementation
158
159	uses FBMessages;
160
161	{ TFBStatement }
162
163	procedure TFBStatement.CheckChangeBatchRowLimit;
164	begin
165	//Do Nothing
166	end;
167
168	procedure TFBStatement.CheckTransaction(aTransaction: ITransaction);
169	begin
170	if (aTransaction = nil) then
171	IBError(ibxeTransactionNotAssigned,[]);
172
173	if not aTransaction.InTransaction then
174	IBError(ibxeNotInTransaction,[]);
175	end;
176
177	procedure TFBStatement.DoJournaling(force: boolean);
178	function doGetRowsAffected: integer;
179	var a,i,u,d: integer;
180	begin
181	GetRowsAffected(a,i,u,d);
182	Result := i + u + d;
183	end;
184
185	var RowsAffected: integer;
186	begin
187	RowsAffected := doGetRowsAffected;
188	with GetAttachment do
189	if JournalingActive and (force or
190	(((joReadOnlyQueries in GetJournalOptions) and (RowsAffected = 0)) or
191	((joModifyQueries in GetJournalOptions) and (RowsAffected > 0)))) then
192	GetJournalIntf.ExecQuery(GetStatementIntf);
193	end;
194
195	function TFBStatement.GetJournalIntf: IJournallingHook;
196	begin
197	GetAttachment.QueryInterface(IJournallingHook,Result)
198	end;
199
200	function TFBStatement.TimeStampToMSecs(const TimeStamp: TTimeStamp): Int64;
201	begin
202	Result := TimeStamp.Time + Int64(timestamp.date)*msecsperday;
203	end;
204
205	constructor TFBStatement.Create(Attachment: IAttachment;
206	Transaction: ITransaction; sql: AnsiString; SQLDialect: integer);
207	begin
208	inherited Create(Transaction as TFBTransaction,2);
209	FAttachmentIntf := Attachment;
210	FTransactionIntf := Transaction;
211	FFirebirdClientAPI := Attachment.getFirebirdAPI as TFBClientAPI;
212	FSQLDialect := SQLDialect;
213	FSQL := sql;
214	FBatchRowLimit := DefaultBatchRowLimit;
215	FStaleReferenceChecks := true;
216	end;
217
218	constructor TFBStatement.CreateWithParameterNames(Attachment: IAttachment;
219	Transaction: ITransaction; sql: AnsiString; SQLDialect: integer;
220	GenerateParamNames: boolean; CaseSensitiveParams: boolean);
221	begin
222	FHasParamNames := true;
223	FGenerateParamNames := GenerateParamNames;
224	FCaseSensitiveParams := CaseSensitiveParams;
225	Create(Attachment,Transaction,sql,SQLDialect);
226	end;
227
228	destructor TFBStatement.Destroy;
229	begin
230	Close;
231	FreeHandle;
232	inherited Destroy;
233	end;
234
235	procedure TFBStatement.Close;
236	begin
237	InternalClose(false);
238	end;
239
240	procedure TFBStatement.TransactionEnding(aTransaction: ITransaction;
241	Force: boolean);
242	begin
243	if FOpen and ((FExecTransactionIntf as TObject) = (aTransaction as TObject)) then
244	InternalClose(Force);
245
246	if FTransactionIntf = aTransaction then
247	begin
248	FreeHandle;
249	FPrepared := false;
250	end;
251	end;
252
253	function TFBStatement.GetRowsAffected(var SelectCount, InsertCount,
254	UpdateCount, DeleteCount: integer): boolean;
255	var
256	RB: ISQLInfoResults;
257	i, j: integer;
258	begin
259	InsertCount := 0;
260	UpdateCount := 0;
261	DeleteCount := 0;
262	Result := FPrepared;
263	if not Result then Exit;
264
265	RB := GetDsqlInfo(isc_info_sql_records);
266
267	for i := 0 to RB.Count - 1 do
268	with RB[i] do
269	case getItemType of
270	isc_info_sql_records:
271	for j := 0 to Count -1 do
272	with Items[j] do
273	case getItemType of
274	isc_info_req_select_count:
275	SelectCount := GetAsInteger;
276	isc_info_req_insert_count:
277	InsertCount := GetAsInteger;
278	isc_info_req_update_count:
279	UpdateCount := GetAsInteger;
280	isc_info_req_delete_count:
281	DeleteCount := GetAsInteger;
282	end;
283	end;
284	end;
285
286	function TFBStatement.GetSQLStatementType: TIBSQLStatementTypes;
287	begin
288	Result := FSQLStatementType;
289	end;
290
291	function TFBStatement.GetSQLStatementTypeName: AnsiString;
292	begin
293	case FSQLStatementType of
294	SQLUnknown: Result := 'SQL_Unknown';
295	SQLSelect: Result := 'SQL_Select';
296	SQLInsert: Result := 'SQL_Insert';
297	SQLUpdate: Result := 'SQL_Update';
298	SQLDelete: Result := 'SQL_Delete';
299	SQLDDL: Result := 'SQL_DDL';
300	SQLGetSegment: Result := 'SQL_GetSegment';
301	SQLPutSegment: Result := 'SQL_PutSegment';
302	SQLExecProcedure: Result := 'SQL_ExecProcedure';
303	SQLStartTransaction: Result := 'SQL_StartTransaction';
304	SQLCommit: Result := 'SQL_Commit';
305	SQLRollback: Result := 'SQL_Rollback';
306	SQLSelectForUpdate: Result := 'SQL_SelectForUpdate';
307	SQLSetGenerator: Result := 'SQL_SetGenerator';
308	SQLSavePoint: Result := 'SQL_SavePoint';
309	end;
310	end;
311
312	function TFBStatement.GetSQLText: AnsiString;
313	begin
314	Result := FSQL;
315	end;
316
317	function TFBStatement.GetProcessedSQLText: AnsiString;
318	begin
319	if not FHasParamNames then
320	Result := FSQL
321	else
322	begin
323	if FProcessedSQL = '' then
324	ProcessSQL(FSQL,FGenerateParamNames,FProcessedSQL);
325	Result := FProcessedSQL;
326	end;
327	end;
328
329	function TFBStatement.GetSQLDialect: integer;
330	begin
331	Result := FSQLDialect;
332	end;
333
334	function TFBStatement.GetFlags: TStatementFlags;
335	begin
336	Result := [];
337	end;
338
339	procedure TFBStatement.Prepare(aTransaction: ITransaction);
340	begin
341	Prepare('',aTransaction);
342	end;
343
344	procedure TFBStatement.Prepare(CursorName: AnsiString;
345	aTransaction: ITransaction);
346	begin
347	if FPrepared then FreeHandle;
348	if aTransaction <> nil then
349	begin
350	RemoveMonitor(FTransactionIntf as TFBTransaction);
351	FTransactionIntf := aTransaction;
352	AddMonitor(FTransactionIntf as TFBTransaction);
353	end;
354	InternalPrepare(CursorName);
355	end;
356
357	function TFBStatement.Execute(aTransaction: ITransaction): IResults;
358	begin
359	try
360	if aTransaction = nil then
361	Result := InternalExecute(FTransactionIntf)
362	else
363	Result := InternalExecute(aTransaction);
364	finally
365	DoJournaling(ExceptObject <> nil);
366	end;
367	end;
368
369	procedure TFBStatement.AddToBatch;
370	begin
371	IBError(ibxeBatchModeNotSupported,[]);
372	end;
373
374	function TFBStatement.ExecuteBatch(aTransaction: ITransaction
375	): IBatchCompletion;
376	begin
377	IBError(ibxeBatchModeNotSupported,[]);
378	end;
379
380	procedure TFBStatement.CancelBatch;
381	begin
382	IBError(ibxeBatchModeNotSupported,[]);
383	end;
384
385	function TFBStatement.GetBatchCompletion: IBatchCompletion;
386	begin
387	IBError(ibxeBatchModeNotSupported,[]);
388	end;
389
390	function TFBStatement.GetBatchRowLimit: integer;
391	begin
392	Result := FBatchRowLimit;
393	end;
394
395	procedure TFBStatement.SetBatchRowLimit(aLimit: integer);
396	begin
397	CheckChangeBatchRowLimit;
398	FBatchRowLimit := aLimit;
399	end;
400
401	procedure TFBStatement.SetStaleReferenceChecks(Enable: boolean);
402	begin
403	FStaleReferenceChecks := Enable;
404	end;
405
406	function TFBStatement.GetStaleReferenceChecks: boolean;
407	begin
408	Result := FStaleReferenceChecks;
409	end;
410
411	function TFBStatement.OpenCursor(aTransaction: ITransaction): IResultSet;
412	begin
413	Result := OpenCursor(false,aTransaction);
414	end;
415
416	function TFBStatement.OpenCursor(Scrollable: boolean; aTransaction: ITransaction
417	): IResultSet;
418	begin
419	Close;
420	try
421	if aTransaction = nil then
422	Result := InternalOpenCursor(FTransactionIntf,Scrollable)
423	else
424	Result := InternalOpenCursor(aTransaction,Scrollable);
425	finally
426	DoJournaling(ExceptObject <> nil);
427	end;
428	end;
429
430	function TFBStatement.CreateBlob(paramName: AnsiString): IBlob;
431	var column: TColumnMetaData;
432	begin
433	InternalPrepare;
434	column := SQLParams.ByName(paramName) as TSQLParam;
435	if column = nil then
436	IBError(ibxeFieldNotFound,[paramName]);
437	Result := CreateBlob(column);
438	end;
439
440	function TFBStatement.CreateBlob(index: integer): IBlob;
441	begin
442	InternalPrepare;
443	Result := CreateBlob(SQLParams[index] as TSQLParam);
444	end;
445
446	function TFBStatement.CreateArray(paramName: AnsiString): IArray;
447	var column: TColumnMetaData;
448	begin
449	InternalPrepare;
450	column := SQLParams.ByName(paramName) as TSQLParam;
451	if column = nil then
452	IBError(ibxeFieldNotFound,[paramName]);
453	Result := CreateArray(column);
454	end;
455
456	function TFBStatement.CreateArray(index: integer): IArray;
457	begin
458	InternalPrepare;
459	Result := CreateArray(SQLParams[index] as TSQLParam);
460	end;
461
462	function TFBStatement.GetAttachment: IAttachment;
463	begin
464	Result := FAttachmentIntf;
465	end;
466
467	function TFBStatement.GetTransaction: ITransaction;
468	begin
469	Result := FTransactionIntf
470	end;
471
472	function TFBStatement.GetDSQLInfo(Request: byte): ISQLInfoResults;
473	begin
474	Result := TSQLInfoResultsBuffer.Create(FFirebirdClientAPI);
475	GetDsqlInfo(Request,Result);
476	end;
477
478	procedure TFBStatement.SetRetainInterfaces(aValue: boolean);
479	begin
480	RetainInterfaces := aValue;
481	end;
482
483	procedure TFBStatement.EnableStatistics(aValue: boolean);
484	begin
485	if FCollectStatistics <> aValue then
486	begin
487	FCollectStatistics := aValue;
488	FStatisticsAvailable := false;
489	end;
490	end;
491
492	function TFBStatement.GetPerfStatistics(var stats: TPerfCounters): boolean;
493	begin
494	Result := FStatisticsAvailable;
495	if Result then
496	begin
497	stats[psCurrentMemory] := FAfterStats[psCurrentMemory];
498	stats[psDeltaMemory] := FAfterStats[psCurrentMemory] - FBeforeStats[psCurrentMemory];
499	stats[psMaxMemory] := FAfterStats[psMaxMemory];
500	stats[psRealTime] := FAfterStats[psRealTime] - FBeforeStats[psRealTime];
501	stats[psUserTime] := FAfterStats[psUserTime] - FBeforeStats[psUserTime];
502	stats[psReads] := FAfterStats[psReads] - FBeforeStats[psReads];
503	stats[psWrites] := FAfterStats[psWrites] - FBeforeStats[psWrites];
504	stats[psFetches] := FAfterStats[psFetches] - FBeforeStats[psFetches];
505	stats[psBuffers] := FAfterStats[psBuffers];
506	end;
507	end;
508
509	function TFBStatement.IsInBatchMode: boolean;
510	begin
511	Result := false;
512	end;
513
514	function TFBStatement.HasBatchMode: boolean;
515	begin
516	Result := false;
517	end;
518
519	end.
520