try (Connection c = new SqlOnJson().convertPlain("{a:[{id:12000,name:\"super\"},{id:90,name:\"remta\"}]}")) {
    ResultSet rs = c.prepareStatement("select * from a").executeQuery();
    while (rs.next()) {
        // my business logic
    }
}

final SqlOnJson sqlOnJson = new SqlOnJson("driver-class", "url", "user", "password");
try (Connection c = sqlOnJson.convertPlain("{a:[{id:12000,name:\"super\"},{id:90,name:\"remta\"}]}")) {
    ...
}

final SqlOnJson sqlOnJson = new SqlOnJson("org.h2.Driver", "jdbc:h2:mem:", "", "");
try (...)