#include <ogrsf_frmts.h>
bool read_data_from_postgis()
{
    using std::string;
    GDALAllRegister();
    GDALDataset* poDS;
    string source = "PG:host=192.168.1.11 port=5432 user=postgres password=abcd dbname=postgres";

    poDS = (GDALDataset*)GDALOpenEx(source.c_str(), NULL, NULL, NULL, NULL);
    if (poDS == nullptr)
    {
        std::cerr << "connection FAILED.n";
        return false;
    }
    std::cout << "Connected to Postgres.n";
    std::cout << poDS->GetLayerCount() << std::endl;  // return 0!!

    return true;
}