Sqlite: Add update hook and use it to get the last changed id

Sqlite has a function to get the last inserted rowid but very often you
want to get the updated rowid too.

Change-Id: Ie276a5039682813ad16597433996a2959f54d9ba
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/sqlite/lastchangedrowid.h

@@ -0,0 +1,71 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "sqlitedatabaseinterface.h"
+
+#include <utils/smallstringio.h>
+
+#include <iostream>
+
+namespace Sqlite {
+
+class LastChangedRowId
+{
+public:
+    LastChangedRowId(DatabaseInterface &database,
+                     Utils::SmallStringView databaseName,
+                     Utils::SmallStringView tableName)
+        : database(database)
+        , databaseName(databaseName)
+        , tableName(tableName)
+    {
+        callback = [this](ChangeType, char const *database, char const *table, long long rowId) {
+            if (this->databaseName == database && this->tableName == table)
+                lastRowId = rowId;
+        };
+
+        database.setUpdateHook(callback);
+    }
+
+    ~LastChangedRowId() { database.resetUpdateHook(); }
+
+    long long takeLastRowId()
+    {
+        long long rowId = lastRowId;
+        lastRowId = -1;
+        return rowId;
+    }
+
+public:
+    DatabaseInterface &database;
+    DatabaseInterface::UpdateCallback callback;
+    Utils::SmallStringView databaseName;
+    Utils::SmallStringView tableName;
+    long long lastRowId = -1;
+};
+
+} // namespace Sqlite