Optimizing query

[Igor Korot]

Hi, ALL,
Can below 4 queries

    std::wstring query1 = L"SELECT rolname FROM pg_roles";
    std::wstring query2 = L"SELECT datname FROM pg_database WHERE
datistemplate = true;";
    std::wstring query3 = L"SELECT pg_encoding_to_char( conforencoding
) AS name FROM pg_conversion";
    std::wstring query4 = L"SELECT collname, collencoding,
collprovider collctype FROM pg_collation";
    std::wstring query5 = L"SELECT spcname FROM pg_tablespace";

be made as one big query to use a 1 DB hit?

Thank you.