/*
Compile:
javac PostgreSqlExample.java

Run:
java -cp postgresql-42.5.4.jar;. PostgreSqlExample

*/

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
 
public class PostgreSqlExample {
    public static void main(String[] args) {
        try (Connection connection = DriverManager.getConnection("jdbc:postgresql://192.168.10.138:5432/example", "postgres", "postgres")) {
 
            System.out.println("Java JDBC PostgreSQL Example");
            // When this class first attempts to establish a connection, it automatically loads any JDBC 4.0 drivers found within 
            // the class path. Note that your application must manually load any JDBC drivers prior to version 4.0.
//          Class.forName("org.postgresql.Driver"); 
 
            System.out.println("Connected to PostgreSQL database!");
            Statement statement = connection.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
            statement.setFetchSize(10);
            System.out.println("Reading records.");
            //ResultSet resultSet = statement.executeQuery("SELECT * FROM test1 a, test1 b, test1 c, test1 d, test1 e, test1 f, test1 g, test1 h, test1 i, test1 j limit (10)");
            ResultSet resultSet = statement.executeQuery("SELECT * FROM test1 a, test1 b, test1 c, test1 d, test1 e, test1 f, test1 g, test1 h, test1 i, test1 j");
            while (resultSet.next()) {
                System.out.print(resultSet.getInt(1));
                System.out.println("-"+ resultSet.getString(2));
            }
 
        } /*catch (ClassNotFoundException e) {
            System.out.println("PostgreSQL JDBC driver not found.");
            e.printStackTrace();
        }*/ catch (SQLException e) {
            System.out.println("Connection failure.");
            e.printStackTrace();
        }
    }
}