java - 如何使用 JDBC 连接到本地主机？

Question

我在自己的机器上安装了 MySql。我使用 MySql CommandLine Client 创建了数据库，创建了表，...在学校做项目时，我使用以下语法连接到学校的数据库:

public static Statement connect() {
  try {
   Class.forName( "com.mysql.jdbc.Driver" ).newInstance();
   conn = DriverManager.getConnection( "1", "2", "3" );
   stmt = conn.createStatement();
  }
  catch( Exception e ) {
   System.out.println( "Connection Error:  " + e );
  }
  return stmt;
 }

在我的本地机器上，我不必输入用户名，我所做的只是以 root 用户身份使用我的密码登录:

Enter password: ****
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.1.53-community MySQL Community Server (GPL)

Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL v2 license

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> use chandb;
Database changed
mysql> show tables;
+------------------+
| Tables_in_chandb |
+------------------+
| another          |
| cars             |
| employees        |
+------------------+
3 rows in set (0.03 sec)

mysql> select * from Another;
+----+-----------+----------+
| Id | GoldValue | Model    |
+----+-----------+----------+
|  0 |       100 | Civic DX |
+----+-----------+----------+
1 row in set (0.00 sec)

mysql>

我想知道如何连接到本地计算机的数据库？我应该将什么作为参数放入方法 .getConnection

conn = DriverManager.getConnection( 
   "1", // ?
   "2", // ?
   "3"  ); // ?

最好的问候，
陈

Answer 1

简单连接:

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

public class Main {
  public static void main(String[] argv) throws Exception {
    String driverName = "org.gjt.mm.mysql.Driver";
    Class.forName(driverName);

    String serverName = "localhost";
    String mydatabase = "mydatabase";
    String url = "jdbc:mysql://" + serverName + "/" + mydatabase; 

    String username = "username";
    String password = "password";
    Connection connection = DriverManager.getConnection(url, username, password);
  }
}