SqlServer函数获取指定日期后的第某个工作日

获取工作日

　　需要编写一个SqlServer函数，F_getWorkday，传入两个参数，第一个为时间date，第二个参数为第几个工作日num。调用F_getWorkday后返回date之后的第num个工作日。

　　现有节假日安排表如下：

　　

drop function [dbo].[F_getWorkday];
create   function [dbo].[F_getWorkday](
   @staDate   datetime,
   @workDay   int
)   
returns   datetime
as     
begin   
  declare @curDay int ; 
  declare @tempDay datetime;
  declare @weekday int;
  declare @endDate datetime;
  set @curDay=1;
  select @tempDay = dateadd(day,1,@staDate);    
  while @curDay <=@workDay
  begin
     declare @tempDay2 datetime; --没有放假   
     if(select COUNT(1) from dategrid where set_type=1 and begin_date<=@tempDay and end_date>=@tempDay)<=0 
        begin--没加班
            if(select COUNT(1) from dategrid where set_type=2 and begin_date<=@tempDay and end_date>=@tempDay)<=0
                begin
                  select @weekday = datepart(weekday, @tempDay);              
                  if (@weekday=1)--星期天
                      begin
                         select @tempDay = dateadd(day,1,@tempDay); 
                      end 
                  else if(@weekday>=2 and @weekday<=6)--周一到周五
                      begin                                      
                          set @endDate = @tempDay;
                          select @tempDay = dateadd(day,1,@tempDay);        
                        set @curDay = @curDay + 1;    
                      end
                  else--周六
                      begin 
                         select @tempDay = dateadd(day,2,@tempDay); 
                      end;       
                end 
            else--加班
                begin
                    set @tempDay2 = null;
                    select @tempDay2 = end_date from dategrid where set_type=2 and begin_date<=@tempDay and end_date>=@tempDay;--@tempDay在加班中的最后一天 
                    set @endDate = @tempDay2;
                    select @tempDay = dateadd(day,1,@tempDay2); 
                    set @curDay = @curDay + 1;
                end;
        end 
     else--放假
        begin
            select @tempDay2 = end_date from dategrid where set_type=1 and begin_date<=@tempDay and end_date>=@tempDay;--@tempDay在放假中的最后一天
            select @tempDay = dateadd(day,1,@tempDay2);
            set @endDate =@tempDay;--最后一天在假期情况
            set @curDay = @curDay + 1;--叠加器加一次
        end;     
  end;    
  return @endDate;
end