sql纯java驱动

import java.sql.*;

public class Test{
 
 public static void main(String[]args){
    Connection cn;
     try{
      Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
      cn=DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;database=pubs","sa","");
      Statement st=cn.createStatement();
      ResultSet rs=st.executeQuery("select *From student");
      if(rs.next()){
       System.out.println ("fff");
      }
      
     }catch(Exception ex){
      ex.printStackTrace();
     }
 
 
 }
}