GPT first

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.14)
+project(cpp-opds)
+
+set(CMAKE_CXX_STANDARD 17)
+
+find_package(Qt6 REQUIRED COMPONENTS Core Sql Network)
+
+add_executable(cpp-opds
+    src/main.cpp
+    src/backend.cpp
+)
+
+target_include_directories(cpp-opds PRIVATE include)
+target_link_libraries(cpp-opds Qt6::Core Qt6::Sql Qt6::Network)

include/backend.cpp

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+#include "backend.h"
+#include <QtCore/QDebug>
+
+Backend::Backend(QObject *parent) : QObject(parent)
+{
+    // Используем SQLite по умолчанию, для PostgreSQL потребуется изменить параметры подключения
+    db = QSqlDatabase::addDatabase("QSQLITE");
+    db.setDatabaseName("opds.db");
+
+    if (!db.open()) {
+        qDebug() << "Error: Unable to open database";
+    }
+}
+
+void Backend::start()
+{
+    qDebug() << "Backend started.";
+}

include/backend.h

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+#ifndef BACKEND_H
+#define BACKEND_H
+
+#include <QObject>
+#include <QtSql>
+
+class Backend : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit Backend(QObject *parent = nullptr);
+    void start();
+
+private:
+    QSqlDatabase db;
+};
+
+#endif // BACKEND_H

src/main.cpp

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+#include <QCoreApplication>
+#include "backend.h"
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication a(argc, argv);
+
+    Backend backend;
+    backend.start();
+
+    return a.exec();
+}