HashTable实例 public class HashTable_msg { public HashTable_msg() { String sum_sql="select mobilenum,count(*) from SJSJ_Msg where (left(in_date,6)=(select left(CONVERT(varchar(12) , getdate(), 112 ),6)))group by mobilenum" Hashtable<

Java对Access数据库的简单操作，包括增删改查，界面程序-Java simple operation, including the Access database CRUD interface program