summaryrefslogtreecommitdiffstats
path: root/src/sql/kernel/qsqlresult.cpp
blob: 6382b4261f647ae3ec84ec661b6896ec93e7e5cd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
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
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtSql module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qvariant.h"
#include "qhash.h"
#include "qregexp.h"
#include "qsqlerror.h"
#include "qsqlfield.h"
#include "qsqlrecord.h"
#include "qsqlresult.h"
#include "qvector.h"
#include "qsqldriver.h"
#include <QDebug>

QT_BEGIN_NAMESPACE

struct QHolder {
    QHolder(const QString& hldr = QString(), int index = -1): holderName(hldr), holderPos(index) {}
    bool operator==(const QHolder& h) const { return h.holderPos == holderPos && h.holderName == holderName; }
    bool operator!=(const QHolder& h) const { return h.holderPos != holderPos || h.holderName != holderName; }
    QString holderName;
    int holderPos;
};

class QSqlResultPrivate
{
public:
    QSqlResultPrivate(QSqlResult* d)
    : q(d), sqldriver(0), idx(QSql::BeforeFirstRow), active(false),
      isSel(false), forwardOnly(false), precisionPolicy(QSql::LowPrecisionDouble), bindCount(0), binds(QSqlResult::PositionalBinding)
    {}

    void clearValues()
    {
        values.clear();
        bindCount = 0;
    }

    void resetBindCount()
    {
        bindCount = 0;
    }

    void clearIndex()
    {
        indexes.clear();
        holders.clear();
        types.clear();
    }

    void clear()
    {
        clearValues();
        clearIndex();;
    }

    QString positionalToNamedBinding();
    QString namedToPositionalBinding();
    QString holderAt(int index) const;

public:
    QSqlResult* q;
    const QSqlDriver* sqldriver;
    int idx;
    QString sql;
    bool active;
    bool isSel;
    QSqlError error;
    bool forwardOnly;
    QSql::NumericalPrecisionPolicy precisionPolicy;

    int bindCount;
    QSqlResult::BindingSyntax binds;

    QString executedQuery;
    QHash<int, QSql::ParamType> types;
    QVector<QVariant> values;
    typedef QHash<QString, int> IndexMap;
    IndexMap indexes;

    typedef QVector<QHolder> QHolderVector;
    QHolderVector holders;
};

QString QSqlResultPrivate::holderAt(int index) const
{
    return indexes.key(index);
}

// return a unique id for bound names
static QString qFieldSerial(int i)
{
    ushort arr[] = { ':', 'f', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
    ushort *ptr = &arr[1];

    while (i > 0) {
        *(++ptr) = 'a' + i % 16;
        i >>= 4;
    }

    return QString(reinterpret_cast<const QChar *>(arr), int(ptr - arr) + 1);
}

static bool qIsAlnum(QChar ch)
{
    uint u = uint(ch.unicode());
    // matches [a-zA-Z0-9_]
    return u - 'a' < 26 || u - 'A' < 26 || u - '0' < 10 || u == '_';
}

QString QSqlResultPrivate::positionalToNamedBinding()
{
    int n = sql.size();

    QString result;
    result.reserve(n * 5 / 4);
    bool inQuote = false;
    int count = 0;

    for (int i = 0; i < n; ++i) {
        QChar ch = sql.at(i);
        if (ch == QLatin1Char('?') && !inQuote) {
            result += qFieldSerial(count++);
        } else {
            if (ch == QLatin1Char('\''))
                inQuote = !inQuote;
            result += ch;
        }
    }
    result.squeeze();
    return result;
}

QString QSqlResultPrivate::namedToPositionalBinding()
{
    int n = sql.size();

    QString result;
    result.reserve(n);
    bool inQuote = false;
    int count = 0;
    int i = 0;

    while (i < n) {
        QChar ch = sql.at(i);
        if (ch == QLatin1Char(':') && !inQuote
                && (i == 0 || sql.at(i - 1) != QLatin1Char(':'))
                && (i < n - 1 && qIsAlnum(sql.at(i + 1)))) {
            int pos = i + 2;
            while (pos < n && qIsAlnum(sql.at(pos)))
                ++pos;
            indexes[sql.mid(i, pos - i)] = count++;
            result += QLatin1Char('?');
            i = pos;
        } else {
            if (ch == QLatin1Char('\''))
                inQuote = !inQuote;
            result += ch;
            ++i;
        }
    }
    result.squeeze();
    return result;
}

/*!
    \class QSqlResult
    \brief The QSqlResult class provides an abstract interface for
    accessing data from specific SQL databases.

    \ingroup database
    \inmodule QtSql

    Normally, you would use QSqlQuery instead of QSqlResult, since
    QSqlQuery provides a generic wrapper for database-specific
    implementations of QSqlResult.

    If you are implementing your own SQL driver (by subclassing
    QSqlDriver), you will need to provide your own QSqlResult
    subclass that implements all the pure virtual functions and other
    virtual functions that you need.

    \sa QSqlDriver
*/

/*!
    \enum QSqlResult::BindingSyntax

    This enum type specifies the different syntaxes for specifying
    placeholders in prepared queries.

    \value PositionalBinding Use the ODBC-style positional syntax, with "?" as placeholders.
    \value NamedBinding Use the Oracle-style syntax with named placeholders (e.g., ":id")
    \omitvalue BindByPosition
    \omitvalue BindByName

    \sa bindingSyntax()
*/

/*!
    \enum QSqlResult::VirtualHookOperation
    \internal
*/

/*!
    Creates a QSqlResult using database driver \a db. The object is
    initialized to an inactive state.

    \sa isActive(), driver()
*/

QSqlResult::QSqlResult(const QSqlDriver *db)
{
    d = new QSqlResultPrivate(this);
    d->sqldriver = db;
    if(db) {
        setNumericalPrecisionPolicy(db->numericalPrecisionPolicy());
    }
}

/*!
    Destroys the object and frees any allocated resources.
*/

QSqlResult::~QSqlResult()
{
    delete d;
}

/*!
    Sets the current query for the result to \a query. You must call
    reset() to execute the query on the database.

    \sa reset(), lastQuery()
*/

void QSqlResult::setQuery(const QString& query)
{
    d->sql = query;
}

/*!
    Returns the current SQL query text, or an empty string if there
    isn't one.

    \sa setQuery()
*/

QString QSqlResult::lastQuery() const
{
    return d->sql;
}

/*!
    Returns the current (zero-based) row position of the result. May
    return the special values QSql::BeforeFirstRow or
    QSql::AfterLastRow.

    \sa setAt(), isValid()
*/
int QSqlResult::at() const
{
    return d->idx;
}


/*!
    Returns true if the result is positioned on a valid record (that
    is, the result is not positioned before the first or after the
    last record); otherwise returns false.

    \sa at()
*/

bool QSqlResult::isValid() const
{
    return d->idx != QSql::BeforeFirstRow && d->idx != QSql::AfterLastRow;
}

/*!
    \fn bool QSqlResult::isNull(int index)

    Returns true if the field at position \a index in the current row
    is null; otherwise returns false.
*/

/*!
    Returns true if the result has records to be retrieved; otherwise
    returns false.
*/

bool QSqlResult::isActive() const
{
    return d->active;
}

/*!
    This function is provided for derived classes to set the
    internal (zero-based) row position to \a index.

    \sa at()
*/

void QSqlResult::setAt(int index)
{
    d->idx = index;
}


/*!
    This function is provided for derived classes to indicate whether
    or not the current statement is a SQL \c SELECT statement. The \a
    select parameter should be true if the statement is a \c SELECT
    statement; otherwise it should be false.

    \sa isSelect()
*/

void QSqlResult::setSelect(bool select)
{
    d->isSel = select;
}

/*!
    Returns true if the current result is from a \c SELECT statement;
    otherwise returns false.

    \sa setSelect()
*/

bool QSqlResult::isSelect() const
{
    return d->isSel;
}

/*!
    Returns the driver associated with the result. This is the object
    that was passed to the constructor.
*/

const QSqlDriver *QSqlResult::driver() const
{
    return d->sqldriver;
}


/*!
    This function is provided for derived classes to set the internal
    active state to \a active.

    \sa isActive()
*/

void QSqlResult::setActive(bool active)
{
    if (active && d->executedQuery.isEmpty())
        d->executedQuery = d->sql;

    d->active = active;
}

/*!
    This function is provided for derived classes to set the last
    error to \a error.

    \sa lastError()
*/

void QSqlResult::setLastError(const QSqlError &error)
{
    d->error = error;
}


/*!
    Returns the last error associated with the result.
*/

QSqlError QSqlResult::lastError() const
{
    return d->error;
}

/*!
    \fn int QSqlResult::size()

    Returns the size of the \c SELECT result, or -1 if it cannot be
    determined or if the query is not a \c SELECT statement.

    \sa numRowsAffected()
*/

/*!
    \fn int QSqlResult::numRowsAffected()

    Returns the number of rows affected by the last query executed, or
    -1 if it cannot be determined or if the query is a \c SELECT
    statement.

    \sa size()
*/

/*!
    \fn QVariant QSqlResult::data(int index)

    Returns the data for field \a index in the current row as
    a QVariant. This function is only called if the result is in
    an active state and is positioned on a valid record and \a index is
    non-negative. Derived classes must reimplement this function and
    return the value of field \a index, or QVariant() if it cannot be
    determined.
*/

/*!
    \fn  bool QSqlResult::reset(const QString &query)

    Sets the result to use the SQL statement \a query for subsequent
    data retrieval.

    Derived classes must reimplement this function and apply the \a
    query to the database. This function is only called after the
    result is set to an inactive state and is positioned before the
    first record of the new result. Derived classes should return
    true if the query was successful and ready to be used, or false
    otherwise.

    \sa setQuery()
*/

/*!
    \fn bool QSqlResult::fetch(int index)

    Positions the result to an arbitrary (zero-based) row \a index.

    This function is only called if the result is in an active state.
    Derived classes must reimplement this function and position the
    result to the row \a index, and call setAt() with an appropriate
    value. Return true to indicate success, or false to signify
    failure.

    \sa isActive(), fetchFirst(), fetchLast(), fetchNext(), fetchPrevious()
*/

/*!
    \fn bool QSqlResult::fetchFirst()

    Positions the result to the first record (row 0) in the result.

    This function is only called if the result is in an active state.
    Derived classes must reimplement this function and position the
    result to the first record, and call setAt() with an appropriate
    value. Return true to indicate success, or false to signify
    failure.

    \sa fetch(), fetchLast()
*/

/*!
    \fn bool QSqlResult::fetchLast()

    Positions the result to the last record (last row) in the result.

    This function is only called if the result is in an active state.
    Derived classes must reimplement this function and position the
    result to the last record, and call setAt() with an appropriate
    value. Return true to indicate success, or false to signify
    failure.

    \sa fetch(), fetchFirst()
*/

/*!
    Positions the result to the next available record (row) in the
    result.

    This function is only called if the result is in an active
    state. The default implementation calls fetch() with the next
    index. Derived classes can reimplement this function and position
    the result to the next record in some other way, and call setAt()
    with an appropriate value. Return true to indicate success, or
    false to signify failure.

    \sa fetch(), fetchPrevious()
*/

bool QSqlResult::fetchNext()
{
    return fetch(at() + 1);
}

/*!
    Positions the result to the previous record (row) in the result.

    This function is only called if the result is in an active state.
    The default implementation calls fetch() with the previous index.
    Derived classes can reimplement this function and position the
    result to the next record in some other way, and call setAt()
    with an appropriate value. Return true to indicate success, or
    false to signify failure.
*/

bool QSqlResult::fetchPrevious()
{
    return fetch(at() - 1);
}

/*!
    Returns true if you can only scroll forward through the result
    set; otherwise returns false.

    \sa setForwardOnly()
*/
bool QSqlResult::isForwardOnly() const
{
    return d->forwardOnly;
}

/*!
    Sets forward only mode to \a forward. If \a forward is true, only
    fetchNext() is allowed for navigating the results. Forward only
    mode needs much less memory since results do not have to be
    cached. By default, this feature is disabled.

    Setting forward only to false is a suggestion to the database engine,
    which has the final say on whether a result set is forward only or
    scrollable. isForwardOnly() will always return the correct status of
    the result set.

    \note Calling setForwardOnly after execution of the query will result
    in unexpected results at best, and crashes at worst.

    \sa isForwardOnly(), fetchNext(), QSqlQuery::setForwardOnly()
*/
void QSqlResult::setForwardOnly(bool forward)
{
    d->forwardOnly = forward;
}

/*!
    Prepares the given \a query, using the underlying database
    functionality where possible. Returns true if the query is
    prepared successfully; otherwise returns false.

    \sa prepare()
*/
bool QSqlResult::savePrepare(const QString& query)
{
    if (!driver())
        return false;
    d->clear();
    d->sql = query;
    if (!driver()->hasFeature(QSqlDriver::PreparedQueries))
        return prepare(query);

    if (driver()->hasFeature(QSqlDriver::NamedPlaceholders)) {
        // parse the query to memorize parameter location
        d->namedToPositionalBinding();
        d->executedQuery = d->positionalToNamedBinding();
    } else {
        d->executedQuery = d->namedToPositionalBinding();
    }
    return prepare(d->executedQuery);
}

/*!
    Prepares the given \a query for execution; the query will normally
    use placeholders so that it can be executed repeatedly. Returns
    true if the query is prepared successfully; otherwise returns false.

    \sa exec()
*/
bool QSqlResult::prepare(const QString& query)
{
    int n = query.size();

    bool inQuote = false;
    int i = 0;

    while (i < n) {
        QChar ch = query.at(i);
        if (ch == QLatin1Char(':') && !inQuote
                && (i == 0 || query.at(i - 1) != QLatin1Char(':'))
                && (i < n - 1 && qIsAlnum(query.at(i + 1)))) {
            int pos = i + 2;
            while (pos < n && qIsAlnum(query.at(pos)))
                ++pos;

            d->holders.append(QHolder(query.mid(i, pos - i), i));
            i = pos;
        } else {
            if (ch == QLatin1Char('\''))
                inQuote = !inQuote;
            ++i;
        }
    }
    d->sql = query;
    return true; // fake prepares should always succeed
}

/*!
    Executes the query, returning true if successful; otherwise returns
    false.

    \sa prepare()
*/
bool QSqlResult::exec()
{
    bool ret;
    // fake preparation - just replace the placeholders..
    QString query = lastQuery();
    if (d->binds == NamedBinding) {
        int i;
        QVariant val;
        QString holder;
        for (i = d->holders.count() - 1; i >= 0; --i) {
            holder = d->holders.at(i).holderName;
            val = d->values.value(d->indexes.value(holder));
            QSqlField f(QLatin1String(""), val.type());
            f.setValue(val);
            query = query.replace(d->holders.at(i).holderPos,
                                   holder.length(), driver()->formatValue(f));
        }
    } else {
        QString val;
        int i = 0;
        int idx = 0;
        for (idx = 0; idx < d->values.count(); ++idx) {
            i = query.indexOf(QLatin1Char('?'), i);
            if (i == -1)
                continue;
            QVariant var = d->values.value(idx);
            QSqlField f(QLatin1String(""), var.type());
            if (var.isNull())
                f.clear();
            else
                f.setValue(var);
            val = driver()->formatValue(f);
            query = query.replace(i, 1, driver()->formatValue(f));
            i += val.length();
        }
    }

    // have to retain the original query with placeholders
    QString orig = lastQuery();
    ret = reset(query);
    d->executedQuery = query;
    setQuery(orig);
    d->resetBindCount();
    return ret;
}

/*!
    Binds the value \a val of parameter type \a paramType to position \a index
    in the current record (row).

    \sa addBindValue()
*/
void QSqlResult::bindValue(int index, const QVariant& val, QSql::ParamType paramType)
{
    d->binds = PositionalBinding;
    d->indexes[qFieldSerial(index)] = index;
    if (d->values.count() <= index)
        d->values.resize(index + 1);
    d->values[index] = val;
    if (paramType != QSql::In || !d->types.isEmpty())
        d->types[index] = paramType;
}

/*!
    \overload

    Binds the value \a val of parameter type \a paramType to the \a
    placeholder name in the current record (row).

   Values cannot be bound to multiple locations in the query, eg:
   \code
   INSERT INTO testtable (id, name, samename) VALUES (:id, :name, :name)
   \endcode
   Binding to name will bind to the first :name, but not the second.

    \note Binding an undefined placeholder will result in undefined behavior.

    \sa QSqlQuery::bindValue()
*/
void QSqlResult::bindValue(const QString& placeholder, const QVariant& val,
                           QSql::ParamType paramType)
{
    d->binds = NamedBinding;
    // if the index has already been set when doing emulated named
    // bindings - don't reset it
    int idx = d->indexes.value(placeholder, -1);
    if (idx >= 0) {
        if (d->values.count() <= idx)
            d->values.resize(idx + 1);
        d->values[idx] = val;
    } else {
        d->values.append(val);
        idx = d->values.count() - 1;
        d->indexes[placeholder] = idx;
    }

    if (paramType != QSql::In || !d->types.isEmpty())
        d->types[idx] = paramType;
}

/*!
    Binds the value \a val of parameter type \a paramType to the next
    available position in the current record (row).

    \sa bindValue()
*/
void QSqlResult::addBindValue(const QVariant& val, QSql::ParamType paramType)
{
    d->binds = PositionalBinding;
    bindValue(d->bindCount, val, paramType);
    ++d->bindCount;
}

/*!
    Returns the value bound at position \a index in the current record
    (row).

    \sa bindValue(), boundValues()
*/
QVariant QSqlResult::boundValue(int index) const
{
    return d->values.value(index);
}

/*!
    \overload

    Returns the value bound by the given \a placeholder name in the
    current record (row).

    \sa bindValueType()
*/
QVariant QSqlResult::boundValue(const QString& placeholder) const
{
    int idx = d->indexes.value(placeholder, -1);
    return d->values.value(idx);
}

/*!
    Returns the parameter type for the value bound at position \a index.

    \sa boundValue()
*/
QSql::ParamType QSqlResult::bindValueType(int index) const
{
    return d->types.value(index, QSql::In);
}

/*!
    \overload

    Returns the parameter type for the value bound with the given \a
    placeholder name.
*/
QSql::ParamType QSqlResult::bindValueType(const QString& placeholder) const
{
    return d->types.value(d->indexes.value(placeholder, -1), QSql::In);
}

/*!
    Returns the number of bound values in the result.

    \sa boundValues()
*/
int QSqlResult::boundValueCount() const
{
    return d->values.count();
}

/*!
    Returns a vector of the result's bound values for the current
    record (row).

    \sa boundValueCount()
*/
QVector<QVariant>& QSqlResult::boundValues() const
{
    return d->values;
}

/*!
    Returns the binding syntax used by prepared queries.
*/
QSqlResult::BindingSyntax QSqlResult::bindingSyntax() const
{
    return d->binds;
}

/*!
    Clears the entire result set and releases any associated
    resources.
*/
void QSqlResult::clear()
{
    d->clear();
}

/*!
    Returns the query that was actually executed. This may differ from
    the query that was passed, for example if bound values were used
    with a prepared query and the underlying database doesn't support
    prepared queries.

    \sa exec(), setQuery()
*/
QString QSqlResult::executedQuery() const
{
    return d->executedQuery;
}

void QSqlResult::resetBindCount()
{
    d->resetBindCount();
}

/*!
    Returns the name of the bound value at position \a index in the
    current record (row).

    \sa boundValue()
*/
QString QSqlResult::boundValueName(int index) const
{
    return d->holderAt(index);
}

/*!
    Returns true if at least one of the query's bound values is a \c
    QSql::Out or a QSql::InOut; otherwise returns false.

    \sa bindValueType()
*/
bool QSqlResult::hasOutValues() const
{
    if (d->types.isEmpty())
        return false;
    QHash<int, QSql::ParamType>::ConstIterator it;
    for (it = d->types.constBegin(); it != d->types.constEnd(); ++it) {
        if (it.value() != QSql::In)
            return true;
    }
    return false;
}

/*!
    Returns the current record if the query is active; otherwise
    returns an empty QSqlRecord.

    The default implementation always returns an empty QSqlRecord.

    \sa isActive()
*/
QSqlRecord QSqlResult::record() const
{
    return QSqlRecord();
}

/*!
    Returns the object ID of the most recent inserted row if the
    database supports it.
    An invalid QVariant will be returned if the query did not
    insert any value or if the database does not report the id back.
    If more than one row was touched by the insert, the behavior is
    undefined.

    Note that for Oracle databases the row's ROWID will be returned,
    while for MySQL databases the row's auto-increment field will
    be returned.

    \sa QSqlDriver::hasFeature()
*/
QVariant QSqlResult::lastInsertId() const
{
    return QVariant();
}

/*! \internal
*/
void QSqlResult::virtual_hook(int, void *)
{
}

/*! \internal
    \since 4.2

    Executes a prepared query in batch mode if the driver supports it,
    otherwise emulates a batch execution using bindValue() and exec().
    QSqlDriver::hasFeature() can be used to find out whether a driver
    supports batch execution.

    Batch execution can be faster for large amounts of data since it
    reduces network roundtrips.

    For batch executions, bound values have to be provided as lists
    of variants (QVariantList).

    Each list must contain values of the same type. All lists must
    contain equal amount of values (rows).

    NULL values are passed in as typed QVariants, for example
    \c {QVariant(QVariant::Int)} for an integer NULL value.

    Example:

    \snippet doc/src/snippets/code/src_sql_kernel_qsqlresult.cpp 0

    Here, we insert two rows into a SQL table, with each row containing three values.

    \sa exec(), QSqlDriver::hasFeature()
*/
bool QSqlResult::execBatch(bool arrayBind)
{
    if (driver()->hasFeature(QSqlDriver::BatchOperations)) {
        virtual_hook(BatchOperation, &arrayBind);
        d->resetBindCount();
        return d->error.type() == QSqlError::NoError;
    } else {
        QVector<QVariant> values = d->values;
        if (values.count() == 0)
            return false;
        for (int i = 0; i < values.at(0).toList().count(); ++i) {
            for (int j = 0; j < values.count(); ++j)
                bindValue(j, values.at(j).toList().at(i), QSql::In);
            if (!exec())
                return false;
        }
        return true;
    }
    return false;
}

/*! \internal
 */
void QSqlResult::detachFromResultSet()
{
    if (driver()->hasFeature(QSqlDriver::FinishQuery) 
            || driver()->hasFeature(QSqlDriver::SimpleLocking))
        virtual_hook(DetachFromResultSet, 0);
}

/*! \internal
 */
void QSqlResult::setNumericalPrecisionPolicy(QSql::NumericalPrecisionPolicy policy)
{
    d->precisionPolicy = policy;
    virtual_hook(SetNumericalPrecision, &policy);
}

/*! \internal
 */
QSql::NumericalPrecisionPolicy QSqlResult::numericalPrecisionPolicy() const
{
    return d->precisionPolicy;
}

/*! \internal
*/
bool QSqlResult::nextResult()
{
    if (driver()->hasFeature(QSqlDriver::MultipleResultSets)) {
        bool result = false;
        virtual_hook(NextResult, &result);
        return result;
    }
    return false;
}

/*!
    Returns the low-level database handle for this result set
    wrapped in a QVariant or an invalid QVariant if there is no handle.

    \warning Use this with uttermost care and only if you know what you're doing.

    \warning The handle returned here can become a stale pointer if the result
    is modified (for example, if you clear it).

    \warning The handle can be NULL if the result was not executed yet.

    The handle returned here is database-dependent, you should query the type
    name of the variant before accessing it.

    This example retrieves the handle for a sqlite result:

    \snippet doc/src/snippets/code/src_sql_kernel_qsqlresult.cpp 1

    This snippet returns the handle for PostgreSQL or MySQL:

    \snippet doc/src/snippets/code/src_sql_kernel_qsqlresult.cpp 2

    \sa QSqlDriver::handle()
*/
QVariant QSqlResult::handle() const
{
    return QVariant();
}

QT_END_NAMESPACE