package test_mysql;import java.sql.*;import java.util.Set;public class testjdbc {	public static Connection getConnection() throws ClassNotFoundException, SQLException{	String URL="jdbc:mysql://localhost:3306/employees";	//加载驱动程序	Class.forName("com.mysql.jdbc.Driver");	String user="root";	String passwd="";	//默认密码为空	//还有选择数据库，哪个数据	//DriverManager.	//Connection con=DriverManager.getConnection(URL, user, passwd);	//Connection con=DriverManager.getConnection(url, user, password);	String test_url="";	//String my_url="jdbc:mysql://localhost:3306;DatabaseName=employees;User=root;Password=";	//test_url+=URL+3306+";"+"DatabaseName=employees;"+"User=root;"+"Password="+"";	Connection con=DriverManager.getConnection(URL,user,passwd);	return con;	}	public static void main(String[] args){	String sql="select * fromdepartments";	Statement statement=null;	Connection con=null;	ResultSet set=null;	try {	con = getConnection();	//con.set	if(con==null)	System.out.println("con null");	statement=con.createStatement();	set=statement.executeQuery(sql);	//int n=set.getFetchSize();	//System.out.println(n);	while(set.next()){	System.out.println(set.getString(1)+""+set.getString(2));	}	} catch (ClassNotFoundException e) {	// TODO Auto-generated catch block	e.printStackTrace();	} catch (SQLException e) {	// TODO Auto-generated catch block	e.printStackTrace();	}finally{	if(con!=null)	try {	set.close();	statement.close();	con.close();	} catch (SQLException e) {	// TODO Auto-generated catch block	e.printStackTrace();	}	}	}}