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50
51#include <QGuiApplication>
52#include <QStandardPaths>
53#include <QSqlDatabase>
54#include <QSqlError>
55#include <QtQml>
56
57#include "sqlcontactmodel.h"
58#include "sqlconversationmodel.h"
59
60static void connectToDatabase()
61{
62 QSqlDatabase database = QSqlDatabase::database();
63 if (!database.isValid()) {
64 database = QSqlDatabase::addDatabase(type: "QSQLITE");
65 if (!database.isValid())
66 qFatal(msg: "Cannot add database: %s", qPrintable(database.lastError().text()));
67 }
68
69 const QDir writeDir = QStandardPaths::writableLocation(type: QStandardPaths::AppDataLocation);
70 if (!writeDir.mkpath(dirPath: "."))
71 qFatal(msg: "Failed to create writable directory at %s", qPrintable(writeDir.absolutePath()));
72
73 // Ensure that we have a writable location on all devices.
74 const QString fileName = writeDir.absolutePath() + "/chat-database.sqlite3";
75 // When using the SQLite driver, open() will create the SQLite database if it doesn't exist.
76 database.setDatabaseName(fileName);
77 if (!database.open()) {
78 qFatal(msg: "Cannot open database: %s", qPrintable(database.lastError().text()));
79 QFile::remove(fileName);
80 }
81}
82
83int main(int argc, char *argv[])
84{
85 QGuiApplication::setAttribute(attribute: Qt::AA_EnableHighDpiScaling);
86 QGuiApplication app(argc, argv);
87
88 qmlRegisterType<SqlContactModel>(uri: "io.qt.examples.chattutorial", versionMajor: 1, versionMinor: 0, qmlName: "SqlContactModel");
89 qmlRegisterType<SqlConversationModel>(uri: "io.qt.examples.chattutorial", versionMajor: 1, versionMinor: 0, qmlName: "SqlConversationModel");
90
91 connectToDatabase();
92
93 QQmlApplicationEngine engine;
94 engine.load(url: QUrl(QStringLiteral("qrc:/main.qml")));
95 if (engine.rootObjects().isEmpty())
96 return -1;
97
98 return app.exec();
99}
100
101

source code of qtquickcontrols2/examples/quickcontrols2/chattutorial/chapter4-models/main.cpp