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package ch12;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.logging.Level;
import java.util.logging.Logger;

public class database {

    //class to ask the DB what version it uses
    protected static void version() {


        String query = "SELECT VERSION()";
        database.conn(query);

    }

    protected static void clean() {


    }

    //DB Connection Class (postgres SQL)
    private static void conn( String query ) {
        try {
            Class.forName("org.postgresql.Driver");
        } catch (ClassNotFoundException ex)
                 {
            Logger.getLogger(database.class.getName()).log(Level.SEVERE, null, ex);
        }

        //set all objects to null
        Connection con = null;
        Statement st = null;
        ResultSet rs = null;

        //config
        String url = "jdbc:postgresql://localhost/java";
        String user = "postgres";
        String pass = "postgres";


        //try to establish connection
        try {

            //connect using credentials in config
            con = DriverManager.getConnection(url, user, pass);
            //create statement structure w/ con details
            st = con.createStatement();
            //inject con details + statement structure, apply statement and execute
            rs = st.executeQuery(query);

            //if result is fileld, print it
            if (rs.next()) {
                System.out.println(rs.getString(1));
            }

        } //if shit goes down, log the error and break
        catch (SQLException ex) {
            System.out.println("oh shit");
            Logger lgr = Logger.getLogger(database.class.getName());
            lgr.log(Level.SEVERE, ex.getMessage(), ex);
        }

    }

}