SQL将int转换为varchar

Question

我需要帮助将一个转换integer成一个varchar.

我正在尝试编写一个接受a ProfileID和a的过程Currenttime; 利用这两个值发现的开始时间profileID和减去currenttime从 starttime并返回hours:minutes:seconds.

我做错了什么,有没有更好的方法来写这个？

谢谢.

CREATE PROCEDURE [dbo].[CalculateElaspedTime]
    -- Add the parameters for the stored procedure here
    @ProfileID nvarchar(10),
    @CurrentDateTime datetime = '' 
AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    -- Insert statements for procedure here
    if @CurrentDateTime = CAST('' as datetime)
    set @CurrentDateTime = GETDATE()

    DECLARE @StartTime datetime;
    DECLARE @ElaspedTime time;
    DECLARE @hh int;
    DECLARE @mm int;
    DECLARE @ss int;
    Declare @TimeString varchar
    set @StartTime = (Select top 1 [DateTime] From Log WHERE ProfileID = @ProfileID);
    set @hh = DateDiff(hour,@StartTime,@CurrentDateTime);
    set @mm = DateDiff(minute,@StartTime,@CurrentDateTime)-60*@hh;
    set @ss = DateDiff(second,@StartTime,@CurrentDateTime)-60*@mm;

    set @TimeString = (Select CAST(@hh as varchar)); -- Fails Here 
    set @ElaspedTime = convert(datetime, cast(@hh as varchar) + ':' + cast(@mm as varchar) + ':' + cast(@ss as varchar));
    INSERT INTO Log (ElaspedTime) Values (@ElaspedTime);
END

Answer 1

试试这个.所有这些兴奋的功能都可能是不必要的.

CONVERT(varchar(10),(@CurrentDateTime-@Start_Time),108)