database_manager.h

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#ifndef DATABASE_MANAGER_H
#define DATABASE_MANAGER_H
 
#include <QObject>
#include <pqxx/pqxx>

class DatabaseManager final : public QObject {
    Q_OBJECT
 
public:
    static DatabaseManager *GetInstance() {
        static DatabaseManager instance;
        return &instance;
    }

    bool IsConnected() const {
        return is_connected_;
    }
 
private:
    explicit DatabaseManager(QObject *parent = nullptr);

    ~DatabaseManager() override = default;

    DatabaseManager(const DatabaseManager &) = delete;

    DatabaseManager &operator=(const DatabaseManager &) = delete;

    std::unique_ptr<pqxx::connection> connection_;
    bool is_connected_;
};
 
#endif // DATABASE_MANAGER_H