Java操纵postgresql

package com.howso.deeplan.flink.utils;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class DBUtils {

	public static void exec(String sql) {
		System.out.println(" this is a test ");
		try {
			Class.forName("org.postgresql.Driver").newInstance();
			String url = "jdbc:postgresql://192.168.0.220:5432/MR";
			Connection con = DriverManager.getConnection(url, "MR","mr");
			Statement st = con.createStatement();
			ResultSet rs = st.executeQuery(sql);
			rs.close();
			st.close();
			con.close();

		} catch (Exception ee) {
			System.out.println(ee);
		}
	}
}