import?java.sql.ResultSet;??
import?java.sql.SQLException;?
import?java.sql.Connection;??
import?java.sql.DriverManager;??
import?java.sql.PreparedStatement;??

public?class?Demo?{??
????
????static?String?sql?=?null;??
????static?DBHelper?db1?=?null;??
????static?ResultSet?ret?=?null;??
????
????public?static?void?main（String[]?args）?{??
????????sql?=?“select?*from?stuinfo“;//SQL語句??
????????db1?=?new?DBHelper（sql）;//創建DBHelper對象
????????
????????try?{??
????????????ret?=?db1.pst.executeQuery（）;//執行語句，得到結果集??
????????????while?（ret.next（））?{??
????????????????String?uid?=?ret.getString（1）;??
????????????????String?ufname?=?ret.getString（2）;??
????????????????String?ulname?=?ret.getString（3）;??
????????????????String?udate?=?ret.getString（4）;??
????????????????System

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????1346??2019-10-15?23:00??Demo.class
?????文件????????2027??2019-10-15?22:47??Demo.java
?????文件??????968670??2017-08-18?15:10??mysql-connector-java-5.1.35-bin.jar
?????文件????????1069??2019-10-15?22:59??student.sql
?????文件????????1252??2019-10-15?23:00??DBHelper.class