JDBC连接数据库(MySQL)

package com.dao;

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

public class DbManager {

private static String URL = "jdbc:mysql://localhost:3306/sales";//sales是数据库名
        private static String USER = "root";
        private static String PWD = "root";
        public static Connection getConn(){
            Connection conn = null;
            try {
                Class.forName("com.mysql.jdbc.Driver");
                conn = DriverManager.getConnection(URL,USER,PWD);
            } catch (SQLException e) {
                e.printStackTrace();
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
            return conn;
        }

public static void closeAll(Connection conn,Statement ste,ResultSet rs){
            if(rs != null){
                try {
                    rs.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if(ste !=null){
                try {
                    ste.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if(conn !=null){
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }

}