insert.java

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.PreparedStatement;

public class App {

    private final String url = "jdbc:postgresql://MATERIALIZE_HOST:6875/materialize";
    private final String user = "MATERIALIZE_USERNAME";
    private final String password = "MATERIALIZE_PASSWORD";

    /**
     * Connect to Materialize
     *
     * @return a Connection object
     */
    public Connection connect() throws SQLException {
        Properties props = new Properties();
        props.setProperty("user", user);
        props.setProperty("password", password);
        props.setProperty("ssl","true");

        return DriverManager.getConnection(url, props);

    }

    public void insert() {

        try (Connection conn = connect()) {
            String code = "GH";
            String name = "Ghana";
            PreparedStatement st = conn.prepareStatement("INSERT INTO countries(code, name) VALUES(?, ?)");
            st.setString(1, code);
            st.setString(2, name);
            int rowsDeleted = st.executeUpdate();
            System.out.println(rowsDeleted + " rows inserted.");
            st.close();
        } catch (SQLException ex) {
            System.out.println(ex.getMessage());
        }
    }

    public static void main(String[] args) {
        App app = new App();
        app.insert();
    }
}