LocalStorage: Return new version of DB from changeVersion()

This is probably what you want if you change the version of the
database. Without this, you need to reopen the connection, which makes
the code ugly.

Fixes: QTBUG-71838
Change-Id: I6f1e118ba8e102d1043c4658d036c144bbde7229
Reviewed-by: Erik Verbruggen <erik.verbruggen@qt.io>

2 files changed, 84 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmlsqldatabase/data/changeVersion.qml b/tests/auto/qml/qqmlsqldatabase/data/changeVersion.qml
new file mode 100644
index 0000000000..7d2683d869
--- /dev/null
+++ b/tests/auto/qml/qqmlsqldatabase/data/changeVersion.qml
@@ -0,0 +1,67 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQml 2.2
+import QtQuick.LocalStorage 2.0
+
+QtObject {
+    property var db;
+    property string version;
+
+    function create() {
+        db = LocalStorage.openDatabaseSync("testdb", "2", "stuff for testing", 100000);
+        version = db.version;
+    }
+
+    function upgrade() {
+        db = db.changeVersion(db.version, "22", function(y) {});
+        version = db.version;
+    }
+}
diff --git a/tests/auto/qml/qqmlsqldatabase/tst_qqmlsqldatabase.cpp b/tests/auto/qml/qqmlsqldatabase/tst_qqmlsqldatabase.cpp
index f1dcefdab6..28f9c9a0c2 100644
--- a/tests/auto/qml/qqmlsqldatabase/tst_qqmlsqldatabase.cpp
+++ b/tests/auto/qml/qqmlsqldatabase/tst_qqmlsqldatabase.cpp
@@ -63,6 +63,7 @@ private slots:
     void testQml_cleanopen_data();
     void testQml_cleanopen();
     void totalDatabases();
+    void upgradeDatabase();
 
     void cleanupTestCase();
 
@@ -200,6 +201,22 @@ void tst_qqmlsqldatabase::totalDatabases()
     QCOMPARE(QDir(dbDir()+"/Databases").entryInfoList(QDir::Files|QDir::NoDotAndDotDot).count(), total_databases_created_by_tests*2);
 }
 
+void tst_qqmlsqldatabase::upgradeDatabase()
+{
+    QQmlComponent component(engine, testFile("changeVersion.qml"));
+    QVERIFY(component.isReady());
+
+    QObject *object = component.create();
+    QVERIFY(object);
+    QVERIFY(object->property("version").toString().isEmpty());
+
+    QVERIFY(QMetaObject::invokeMethod(object, "create"));
+    QCOMPARE(object->property("version").toString(), QLatin1String("2"));
+
+    QVERIFY(QMetaObject::invokeMethod(object, "upgrade"));
+    QCOMPARE(object->property("version").toString(), QLatin1String("22"));
+}
+
 QTEST_MAIN(tst_qqmlsqldatabase)
 
 #include "tst_qqmlsqldatabase.moc"