package cn.jd.jdbc;

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

/*
?* 測(cè)試跟數(shù)據(jù)庫(kù)建立連接
?*/
public class Demo01 {
?? ??? ?public static void main(String[] args) {
?? ??? ??? ?try {
?? ??? ??? ??? ?//加載驅(qū)動(dòng)(把接口加載里面然后java就可以使用接口了)
?? ??? ??? ??? ?Class.forName("com.mysql.jdbc.Driver");
?? ??? ??? ??? ?long start=System.currentTimeMillis();
?? ??? ??? ??? ?//創(chuàng)建和數(shù)據(jù)庫(kù)的連接(連接對(duì)象內(nèi)部其實(shí)包含了Socket對(duì)象,是一個(gè)遠(yuǎn)程的連接.比較耗時(shí)!這是Connection對(duì)象管理的一個(gè)要點(diǎn))
?? ??? ??? ??? ?//真正開(kāi)發(fā)中，為了提高效率，都會(huì)使用連接池來(lái)管理連接對(duì)象
?? ??? ??? ??? ?Connection conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/user?useSSL=false","root","root");
?? ??? ??? ??? ?long end=System.currentTimeMillis();
?? ??? ??? ??? ?System.out.println(conn);
?? ??? ??? ??? ?System.out.println("建立連接耗時(shí):"+(end-start)+"ms");
?? ??? ??? ?} catch (ClassNotFoundException e) {
?? ??? ??? ??? ?// TODO Auto-generated catch block
?? ??? ??? ??? ?e.printStackTrace();
?? ??? ??? ?} catch (SQLException e) {
?? ??? ??? ??? ?// TODO Auto-generated catch block
?? ??? ??? ??? ?e.printStackTrace();
?? ??? ??? ?}
?? ??? ?}
}