visual-studio-2010 - sql 查询 - 变量 - 日期 - Visual Studio 210

Question

试图在两个日期之间进行搜索以获取某些rows. 7天的搜索。

   @date = DateTime.Today
   @date2 = //need it to be the prior 7 days

SelectCommand = "SELECT [DateReceived], [DeviceLevel] FROM [TBLReadings] WHERE [DateReceived=@date] <= [DateReceived=@date2] ORDER BY [DateReceived] DESC;

这是错误的，但我希望它能解释我正在尝试做的事情 - 只使用过PHP和MySQL.

Answer 1

如果您尝试在 2 个日期之间进行搜索，则可以使用between

查询将类似于

select [dateRecieved], [DeviceLevel] from YourTable where DateReceived between @date and @date2 ORDER BY [DateReceived] DESC

在 c# 中，要获得 7 天，您可以使用Datetime.Now.AddDays(7)

http://msdn.microsoft.com/en-us/library/system.datetime.adddays.aspx

对不起英语不好！

编辑：这只是查询，在选择命令中将其用作字符串