summaryrefslogtreecommitdiffstats
path: root/src/declarative/qml/qdeclarativesqldatabase.cpp
blob: bda02a59f09028a8a4b6b6122c51541fcb8beb34 (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
/****************************************************************************
**
** 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 QtDeclarative 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 "private/qdeclarativesqldatabase_p.h"

#include "qdeclarativeengine.h"
#include "private/qdeclarativeengine_p.h"
#include "private/qdeclarativerefcount_p.h"
#include "private/qdeclarativeengine_p.h"

#include <QtCore/qobject.h>
#include <QtScript/qscriptvalue.h>
#include <QtScript/qscriptvalueiterator.h>
#include <QtScript/qscriptcontext.h>
#include <QtScript/qscriptengine.h>
#include <QtScript/qscriptclasspropertyiterator.h>
#include <QtSql/qsqldatabase.h>
#include <QtSql/qsqlquery.h>
#include <QtSql/qsqlerror.h>
#include <QtSql/qsqlrecord.h>
#include <QtCore/qstack.h>
#include <QtCore/qcryptographichash.h>
#include <QtCore/qsettings.h>
#include <QtCore/qdir.h>
#include <QtCore/qdebug.h>

Q_DECLARE_METATYPE(QSqlDatabase)
Q_DECLARE_METATYPE(QSqlQuery)

QT_BEGIN_NAMESPACE

class QDeclarativeSqlQueryScriptClass: public QScriptClass {
public:
    QDeclarativeSqlQueryScriptClass(QScriptEngine *engine) : QScriptClass(engine)
    {
        str_length = engine->toStringHandle(QLatin1String("length"));
        str_forwardOnly = engine->toStringHandle(QLatin1String("forwardOnly")); // not in HTML5 (an optimization)
    }

    QueryFlags queryProperty(const QScriptValue &,
                             const QScriptString &name,
                             QueryFlags flags, uint *)
    {
        if (flags & HandlesReadAccess) {
            if (name == str_length) {
                return HandlesReadAccess;
            } else if (name == str_forwardOnly) {
                return flags;
            }
        }
        if (flags & HandlesWriteAccess)
            if (name == str_forwardOnly)
                return flags;
        return 0;
    }

    QScriptValue property(const QScriptValue &object,
                          const QScriptString &name, uint)
    {
        QSqlQuery query = qscriptvalue_cast<QSqlQuery>(object.data());
        if (name == str_length) {
            int s = query.size();
            if (s<0) {
                // Inefficient.
                if (query.last()) {
                    return query.at()+1;
                } else {
                    return 0;
                }
            } else {
                return s;
            }
        } else if (name == str_forwardOnly) {
            return query.isForwardOnly();
        }
        return engine()->undefinedValue();
    }

    void setProperty(QScriptValue &object,
                      const QScriptString &name, uint, const QScriptValue & value)
    {
        if (name == str_forwardOnly) {
            QSqlQuery query = qscriptvalue_cast<QSqlQuery>(object.data());
            query.setForwardOnly(value.toBool());
        }
    }

    QScriptValue::PropertyFlags propertyFlags(const QScriptValue &/*object*/, const QScriptString &name, uint /*id*/)
    {
        if (name == str_length) {
            return QScriptValue::Undeletable
                | QScriptValue::SkipInEnumeration;
        }
        return QScriptValue::Undeletable;
    }

private:
    QScriptString str_length;
    QScriptString str_forwardOnly;
};

// If the spec changes to allow iteration, check git history...
// class QDeclarativeSqlQueryScriptClassPropertyIterator : public QScriptClassPropertyIterator



enum SqlException {
    UNKNOWN_ERR,
    DATABASE_ERR,
    VERSION_ERR,
    TOO_LARGE_ERR,
    QUOTA_ERR,
    SYNTAX_ERR,
    CONSTRAINT_ERR,
    TIMEOUT_ERR
};

static const char* sqlerror[] = {
    "UNKNOWN_ERR",
    "DATABASE_ERR",
    "VERSION_ERR",
    "TOO_LARGE_ERR",
    "QUOTA_ERR",
    "SYNTAX_ERR",
    "CONSTRAINT_ERR",
    "TIMEOUT_ERR",
    0
};

#define THROW_SQL(error, desc) \
{ \
    QScriptValue errorValue = context->throwError(desc); \
    errorValue.setProperty(QLatin1String("code"), error); \
    return errorValue; \
}

static QString qmlsqldatabase_databasesPath(QScriptEngine *engine)
{
    QDeclarativeScriptEngine *qmlengine = static_cast<QDeclarativeScriptEngine*>(engine);
    return qmlengine->offlineStoragePath
            + QDir::separator() + QLatin1String("Databases");
}

static void qmlsqldatabase_initDatabasesPath(QScriptEngine *engine)
{
    QDir().mkpath(qmlsqldatabase_databasesPath(engine));
}

static QString qmlsqldatabase_databaseFile(const QString& connectionName, QScriptEngine *engine)
{
    return qmlsqldatabase_databasesPath(engine) + QDir::separator()
            + connectionName;
}


static QScriptValue qmlsqldatabase_item(QScriptContext *context, QScriptEngine *engine)
{
    QSqlQuery query = qscriptvalue_cast<QSqlQuery>(context->thisObject().data());
    int i = context->argument(0).toNumber();
    if (query.at() == i || query.seek(i)) { // Qt 4.6 doesn't optimize seek(at())
        QSqlRecord r = query.record();
        QScriptValue row = engine->newObject();
        for (int j=0; j<r.count(); ++j) {
            row.setProperty(r.fieldName(j), QScriptValue(engine,r.value(j).toString()));
        }
        return row;
    }
    return engine->undefinedValue();
}

static QScriptValue qmlsqldatabase_executeSql_outsidetransaction(QScriptContext *context, QScriptEngine * /*engine*/)
{
    THROW_SQL(DATABASE_ERR,QDeclarativeEngine::tr("executeSql called outside transaction()"));
}

static QScriptValue qmlsqldatabase_executeSql(QScriptContext *context, QScriptEngine *engine)
{
    QSqlDatabase db = qscriptvalue_cast<QSqlDatabase>(context->thisObject());
    QString sql = context->argument(0).toString();
    QSqlQuery query(db);
    bool err = false;

    QScriptValue result;

    if (query.prepare(sql)) {
        if (context->argumentCount() > 1) {
            QScriptValue values = context->argument(1);
            if (values.isObject()) {
                if (values.isArray()) {
                    int size = values.property(QLatin1String("length")).toInt32();
                    for (int i = 0; i < size; ++i)
                        query.bindValue(i, values.property(i).toVariant());
                } else {
                    for (QScriptValueIterator it(values); it.hasNext();) {
                        it.next();
                        query.bindValue(it.name(),it.value().toVariant());
                    }
                }
            } else {
                query.bindValue(0,values.toVariant());
            }
        }
        if (query.exec()) {
            result = engine->newObject();
            QDeclarativeScriptEngine *qmlengine = static_cast<QDeclarativeScriptEngine*>(engine);
            if (!qmlengine->sqlQueryClass)
                qmlengine->sqlQueryClass = new QDeclarativeSqlQueryScriptClass(engine);
            QScriptValue rows = engine->newObject(qmlengine->sqlQueryClass);
            rows.setData(engine->newVariant(qVariantFromValue(query)));
            rows.setProperty(QLatin1String("item"), engine->newFunction(qmlsqldatabase_item,1), QScriptValue::SkipInEnumeration);
            result.setProperty(QLatin1String("rows"),rows);
            result.setProperty(QLatin1String("rowsAffected"),query.numRowsAffected());
            result.setProperty(QLatin1String("insertId"),query.lastInsertId().toString());
        } else {
            err = true;
        }
    } else {
        err = true;
    }
    if (err)
        THROW_SQL(DATABASE_ERR,query.lastError().text());
    return result;
}

static QScriptValue qmlsqldatabase_executeSql_readonly(QScriptContext *context, QScriptEngine *engine)
{
    QString sql = context->argument(0).toString();
    if (sql.startsWith(QLatin1String("SELECT"),Qt::CaseInsensitive)) {
        return qmlsqldatabase_executeSql(context,engine);
    } else {
        THROW_SQL(SYNTAX_ERR,QDeclarativeEngine::tr("Read-only Transaction"))
    }
}

static QScriptValue qmlsqldatabase_change_version(QScriptContext *context, QScriptEngine *engine)
{
    if (context->argumentCount() < 2)
        return engine->undefinedValue();

    QSqlDatabase db = qscriptvalue_cast<QSqlDatabase>(context->thisObject());
    QString from_version = context->argument(0).toString();
    QString to_version = context->argument(1).toString();
    QScriptValue callback = context->argument(2);

    QScriptValue instance = engine->newObject();
    instance.setProperty(QLatin1String("executeSql"), engine->newFunction(qmlsqldatabase_executeSql,1));
    QScriptValue tx = engine->newVariant(instance,qVariantFromValue(db));

    QString foundvers = context->thisObject().property(QLatin1String("version")).toString();
    if (from_version!=foundvers) {
        THROW_SQL(VERSION_ERR,QDeclarativeEngine::tr("Version mismatch: expected %1, found %2").arg(from_version).arg(foundvers));
        return engine->undefinedValue();
    }

    bool ok = true;
    if (callback.isFunction()) {
        ok = false;
        db.transaction();
        callback.call(QScriptValue(), QScriptValueList() << tx);
        if (engine->hasUncaughtException()) {
            db.rollback();
        } else {
            if (!db.commit()) {
                db.rollback();
                THROW_SQL(UNKNOWN_ERR,QDeclarativeEngine::tr("SQL transaction failed"));
            } else {
                ok = true;
            }
        }
    }

    if (ok) {
        context->thisObject().setProperty(QLatin1String("version"), to_version, QScriptValue::ReadOnly);
        QSettings ini(qmlsqldatabase_databaseFile(db.connectionName(),engine) + QLatin1String(".ini"), QSettings::IniFormat);
        ini.setValue(QLatin1String("Version"), to_version);
    }

    return engine->undefinedValue();
}

static QScriptValue qmlsqldatabase_transaction_shared(QScriptContext *context, QScriptEngine *engine, bool readOnly)
{
    QSqlDatabase db = qscriptvalue_cast<QSqlDatabase>(context->thisObject());
    QScriptValue callback = context->argument(0);
    if (!callback.isFunction())
        THROW_SQL(UNKNOWN_ERR,QDeclarativeEngine::tr("transaction: missing callback"));

    QScriptValue instance = engine->newObject();
    instance.setProperty(QLatin1String("executeSql"),
        engine->newFunction(readOnly ? qmlsqldatabase_executeSql_readonly : qmlsqldatabase_executeSql,1));
    QScriptValue tx = engine->newVariant(instance,qVariantFromValue(db));

    db.transaction();
    callback.call(QScriptValue(), QScriptValueList() << tx);
    instance.setProperty(QLatin1String("executeSql"),
        engine->newFunction(qmlsqldatabase_executeSql_outsidetransaction));
    if (engine->hasUncaughtException()) {
        db.rollback();
    } else {
        if (!db.commit())
            db.rollback();
    }
    return engine->undefinedValue();
}

static QScriptValue qmlsqldatabase_transaction(QScriptContext *context, QScriptEngine *engine)
{
    return qmlsqldatabase_transaction_shared(context,engine,false);
}
static QScriptValue qmlsqldatabase_read_transaction(QScriptContext *context, QScriptEngine *engine)
{
    return qmlsqldatabase_transaction_shared(context,engine,true);
}

/*
    Currently documented in doc/src/declarastive/globalobject.qdoc
*/
static QScriptValue qmlsqldatabase_open_sync(QScriptContext *context, QScriptEngine *engine)
{
    qmlsqldatabase_initDatabasesPath(engine);

    QSqlDatabase database;

    QString dbname = context->argument(0).toString();
    QString dbversion = context->argument(1).toString();
    QString dbdescription = context->argument(2).toString();
    int dbestimatedsize = context->argument(3).toNumber();
    QScriptValue dbcreationCallback = context->argument(4);

    QCryptographicHash md5(QCryptographicHash::Md5);
    md5.addData(dbname.toUtf8());
    QString dbid(QLatin1String(md5.result().toHex()));

    QString basename = qmlsqldatabase_databaseFile(dbid, engine);
    bool created = false;
    QString version = dbversion;

    {
        QSettings ini(basename+QLatin1String(".ini"),QSettings::IniFormat);

        if (QSqlDatabase::connectionNames().contains(dbid)) {
            database = QSqlDatabase::database(dbid);
            version = ini.value(QLatin1String("Version")).toString();
            if (version != dbversion && !dbversion.isEmpty() && !version.isEmpty())
                THROW_SQL(VERSION_ERR,QDeclarativeEngine::tr("SQL: database version mismatch"));
        } else {
            created = !QFile::exists(basename+QLatin1String(".sqlite"));
            database = QSqlDatabase::addDatabase(QLatin1String("QSQLITE"), dbid);
            if (created) {
                ini.setValue(QLatin1String("Name"), dbname);
                if (dbcreationCallback.isFunction())
                    version = QString();
                ini.setValue(QLatin1String("Version"), version);
                ini.setValue(QLatin1String("Description"), dbdescription);
                ini.setValue(QLatin1String("EstimatedSize"), dbestimatedsize);
                ini.setValue(QLatin1String("Driver"), QLatin1String("QSQLITE"));
            } else {
                if (!dbversion.isEmpty() && ini.value(QLatin1String("Version")) != dbversion) {
                    // Incompatible
                    THROW_SQL(VERSION_ERR,QDeclarativeEngine::tr("SQL: database version mismatch"));
                }
                version = ini.value(QLatin1String("Version")).toString();
            }
            database.setDatabaseName(basename+QLatin1String(".sqlite"));
        }
        if (!database.isOpen())
            database.open();
    }

    QScriptValue instance = engine->newObject();
    instance.setProperty(QLatin1String("transaction"), engine->newFunction(qmlsqldatabase_transaction,1));
    instance.setProperty(QLatin1String("readTransaction"), engine->newFunction(qmlsqldatabase_read_transaction,1));
    instance.setProperty(QLatin1String("version"), version, QScriptValue::ReadOnly);
    instance.setProperty(QLatin1String("changeVersion"), engine->newFunction(qmlsqldatabase_change_version,3));

    QScriptValue result = engine->newVariant(instance,qVariantFromValue(database));

    if (created && dbcreationCallback.isFunction()) {
        dbcreationCallback.call(QScriptValue(), QScriptValueList() << result);
    }

    return result;
}

void qt_add_qmlsqldatabase(QScriptEngine *engine)
{
    QScriptValue openDatabase = engine->newFunction(qmlsqldatabase_open_sync, 4);
    engine->globalObject().setProperty(QLatin1String("openDatabaseSync"), openDatabase);

    QScriptValue sqlExceptionPrototype = engine->newObject();
    for (int i=0; sqlerror[i]; ++i)
        sqlExceptionPrototype.setProperty(QLatin1String(sqlerror[i]),
            i,QScriptValue::ReadOnly | QScriptValue::Undeletable | QScriptValue::SkipInEnumeration);

    engine->globalObject().setProperty(QLatin1String("SQLException"), sqlExceptionPrototype);
}

/*
HTML5 "spec" says "rs.rows[n]", but WebKit only impelments "rs.rows.item(n)". We do both (and property iterator).
We add a "forwardOnly" property that stops Qt caching results (code promises to only go forward
through the data.
*/

QT_END_NAMESPACE