C#按日期或时间（年、月、日）查询数据库，找到符合某个时间的数据。本例使用SQL语句与数据库建立连接，实例化DataSet类，设置SQL语句，添加年、月、日条件，用DataGrid显示数据。-C# query the database by date or time (year, month, day), find the line with a time of data. This case to establish a connection with the database using S