SQL语句写返回一天内的纪录,得到一周内星期几的时间

#region 获取星期几对应的时间
week = DateTime.Today.DayOfWeek.ToString();
switch (week)
{
case "Monday":
week = "星期一";
MondayTime = DateTime.Today;
TuesdayTime = DateTime.Today.AddDays(1);
WednesdayTime = DateTime.Today.AddDays(2);
ThursdayTime = DateTime.Today.AddDays(3);
FridayTime = DateTime.Today.AddDays(4);
SaturdayTime = DateTime.Today.AddDays(5);
SundayTime = DateTime.Today.AddDays(6);
break;
case "Tuesday":
week = "星期二";
MondayTime = DateTime.Today.AddDays(-1);
TuesdayTime = DateTime.Today;
WednesdayTime = DateTime.Today.AddDays(1);
ThursdayTime = DateTime.Today.AddDays(2);
FridayTime = DateTime.Today.AddDays(3);
SaturdayTime = DateTime.Today.AddDays(4);
SundayTime = DateTime.Today.AddDays(5);
break;
case "Wednesday":
week = "星期三";
MondayTime = DateTime.Today.AddDays(-2);
TuesdayTime = DateTime.Today.AddDays(-1);
WednesdayTime = DateTime.Today;
ThursdayTime = DateTime.Today.AddDays(1);
FridayTime = DateTime.Today.AddDays(2);
SaturdayTime = DateTime.Today.AddDays(3);
SundayTime = DateTime.Today.AddDays(4);
break;
case "Thursday":
week = "星期四";
MondayTime = DateTime.Today.AddDays(-3);
TuesdayTime = DateTime.Today.AddDays(-2);
WednesdayTime = DateTime.Today.AddDays(-1);
ThursdayTime = DateTime.Today;
FridayTime = DateTime.Today.AddDays(1);
SaturdayTime = DateTime.Today.AddDays(2);
SundayTime = DateTime.Today.AddDays(3);
break;
case "Friday":
week = "星期五";
MondayTime = DateTime.Today.AddDays(-4);
TuesdayTime = DateTime.Today.AddDays(-3);
WednesdayTime = DateTime.Today.AddDays(-2);
ThursdayTime = DateTime.Today.AddDays(-1);
FridayTime = DateTime.Today;
SaturdayTime = DateTime.Today.AddDays(1);
SundayTime = DateTime.Today.AddDays(2);
break;
case "Saturday":
week = "星期六";
MondayTime = DateTime.Today.AddDays(-5);
TuesdayTime = DateTime.Today.AddDays(-4);
WednesdayTime = DateTime.Today.AddDays(-3);
ThursdayTime = DateTime.Today.AddDays(-2);
FridayTime = DateTime.Today.AddDays(-1);
SaturdayTime = DateTime.Today;
SundayTime = DateTime.Today.AddDays(1);
break;
case "Sunday":
week = "星期日";
MondayTime = DateTime.Today.AddDays(-6);
TuesdayTime = DateTime.Today.AddDays(-5);
WednesdayTime = DateTime.Today.AddDays(-4);
ThursdayTime = DateTime.Today.AddDays(-3);
FridayTime = DateTime.Today.AddDays(-2);
SaturdayTime = DateTime.Today.AddDays(-1);
SundayTime = DateTime.Today;　　　　
break;
}

表里有一个时间字段，通过这个字段获取一天时间段内的纪录。

主要用到SQL的DateDiff函数:返回两个日期之间的天数。

格式为：DATEDIFF(datepart,startdate,enddate)

要返回一天时间段内的数据SQL语句为：

select top 7 CartoonName,PlayDate,PlayTV from T_CartoonPlay where

DateDiff(d,PlayDate,'" + SundayTime + "')=0

d代表day，天数的意思，也可以是年，月 yy,mm，整个sql语句的意思是取到指定时间SundayTime和表里的PlayDate的时间差为0的所有数据，

即返回当天的所有数据

转载于:https://www.cnblogs.com/sheseido/archive/2011/05/24/2055641.html

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SQL语句写返回一天内的纪录,得到一周内星期几的时间

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