System.Data.SQLite
Check-in [5f06409677]
Not logged in

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Increased performance ExecuteScalar() and ExecuteNonQuery() resulting in a nice boost in the insert 100k rows tests and user-function tests
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | sourceforge
Files: files | file ages | folders
SHA1: 5f0640967776054490bb3244eb97791ae9ff21ec
User & Date: rmsimpson 2005-03-04 21:30:56
Context
2005-03-04
21:31
Modified to use the new utility type conversion helper(s) in SQLiteBase and SQLiteConvert check-in: 6886e6f4fb user: rmsimpson tags: sourceforge
21:30
Increased performance ExecuteScalar() and ExecuteNonQuery() resulting in a nice boost in the insert 100k rows tests and user-function tests check-in: 5f06409677 user: rmsimpson tags: sourceforge
21:30
Added more internal-use utility type conversion helpers check-in: 1f38aec2e8 user: rmsimpson tags: sourceforge
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to System.Data.SQLite/SQLiteCommand.cs.

272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
...
303
304
305
306
307
308
309










310
311
312




313
314
315





316
317
318
319
320
321
322
323
324
325
326
327
328
329
330

331
332


333
















334
335
336
337
338
339
340
341
342
343

344
345


346























347
348
349
350
351
352
353
354
        if (value != _cnn._activeTransaction && value != null)
        {
          throw new ArgumentOutOfRangeException();
        }
      }
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="behavior"></param>
    /// <returns></returns>
    protected override DbDataReader ExecuteDbDataReader(CommandBehavior behavior)
    {
      if (_isReaderOpen )
        throw new InvalidOperationException("DataReader already active on this command");

      if (_cnn == null)
        throw new InvalidOperationException("No connection associated with this Command");

      if (_cnn.State != ConnectionState.Open)
        throw new InvalidOperationException("Database is not open");
................................................................................
      // Make sure all parameters are mapped properly to associated statement(s)
      _parameterCollection.MapParameters();

      x = _statementList.Length;
      // Bind all parameters to their statements
      for (n = 0; n < x; n++)
        _statementList[n].BindParameters();











      _cnn._sql.SetTimeout(_commandTimeout * 1000);





      _isReaderOpen = true;

      return new SQLiteDataReader(this, behavior);





    }

    internal void ClearDataReader()
    {
      _isReaderOpen = false;
    }

    /// <summary>
    /// Execute the command and return the number of rows inserted/updated affected by it.
    /// </summary>
    /// <returns></returns>
    public override int ExecuteNonQuery()
    {
      using (DbDataReader rd = ExecuteDbDataReader(CommandBehavior.Default))
      {

        rd.Close();
        return rd.RecordsAffected;


      }
















    }

    /// <summary>
    /// Execute the command and return the first column of the first row of the resultset (if present), or null if no resultset was returned.
    /// </summary>
    /// <returns></returns>
    public override object ExecuteScalar()
    {
      using (DbDataReader rd = ExecuteDbDataReader(CommandBehavior.Default))
      {

        if (rd.Read())
          return rd[0];


      }























      return null;
    }

    /// <summary>
    /// Prepares the command for execution.
    /// </summary>
    public override void Prepare()
    {







|
<
<
<
<
<

|







 







>
>
>
>
>
>
>
>
>
>



>
>
>
>
|
|
<
>
>
>
>
>













|
<
>
|
|
>
>
|
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>








|
<
>
|
|
>
>
|
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
|







272
273
274
275
276
277
278
279





280
281
282
283
284
285
286
287
288
...
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323

324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342

343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373

374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
        if (value != _cnn._activeTransaction && value != null)
        {
          throw new ArgumentOutOfRangeException();
        }
      }
    }

    private void InitializeForReader()





    {
      if (_isReaderOpen)
        throw new InvalidOperationException("DataReader already active on this command");

      if (_cnn == null)
        throw new InvalidOperationException("No connection associated with this Command");

      if (_cnn.State != ConnectionState.Open)
        throw new InvalidOperationException("Database is not open");
................................................................................
      // Make sure all parameters are mapped properly to associated statement(s)
      _parameterCollection.MapParameters();

      x = _statementList.Length;
      // Bind all parameters to their statements
      for (n = 0; n < x; n++)
        _statementList[n].BindParameters();
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="behavior"></param>
    /// <returns></returns>
    protected override DbDataReader ExecuteDbDataReader(CommandBehavior behavior)
    {
      InitializeForReader();

      _cnn._sql.SetTimeout(_commandTimeout * 1000);

      try
      {
        SQLiteDataReader rd = new SQLiteDataReader(this, behavior);

        _isReaderOpen = true;
        

        return rd;
      }
      finally
      {
      }
    }

    internal void ClearDataReader()
    {
      _isReaderOpen = false;
    }

    /// <summary>
    /// Execute the command and return the number of rows inserted/updated affected by it.
    /// </summary>
    /// <returns></returns>
    public override int ExecuteNonQuery()
    {
      //using (DbDataReader rd = ExecuteDbDataReader(CommandBehavior.Default))

      //{
      //  rd.Close();
      //  return rd.RecordsAffected;
      //}
      InitializeForReader();

      _cnn._sql.SetTimeout(_commandTimeout * 1000);

      int nAffected = 0;
      int n;
      int x;

      x = _statementList.Length;

      for (n = 0; n < x; n++)
      {
        _cnn._sql.Step(_statementList[n]);
        nAffected += _cnn._sql.Changes;
        _cnn._sql.Reset(_statementList[n]);
      }

      return nAffected;
    }

    /// <summary>
    /// Execute the command and return the first column of the first row of the resultset (if present), or null if no resultset was returned.
    /// </summary>
    /// <returns></returns>
    public override object ExecuteScalar()
    {
      //using (DbDataReader rd = ExecuteDbDataReader(CommandBehavior.Default))

      //{
      //  if (rd.Read())
      //    return rd[0];
      //}
      //return null;

      InitializeForReader();

      _cnn._sql.SetTimeout(_commandTimeout * 1000);

      int n;
      int x;
      object ret = null;
      SQLiteType typ = new SQLiteType();

      x = _statementList.Length;

      for (n = 0; n < x; n++)
      {
        if (_cnn._sql.Step(_statementList[n]) == true)
        {
          ret = _cnn._sql.GetValue(_statementList[n], 0, ref typ);
        }
        _cnn._sql.Reset(_statementList[n]);
        if (ret != null) break;
      }

      if (ret == null) ret = DBNull.Value;

      return ret;
    }

    /// <summary>
    /// Prepares the command for execution.
    /// </summary>
    public override void Prepare()
    {