sql server 提取数字并计算

ALTER FUNCTION [dbo].[SplitString3]
(
@str NVARCHAR(4000),
@char NVARCHAR(10)
)
RETURNS NVARCHAR(4000)
AS
BEGIN
begin
declare @inte int=1
end
SET @str = @str + @char
WHILE LEN(@str) -PATINDEX('%[^0-9]%',@str) > 1
BEGIN

SET @inte = @inte*SUBSTRING(@str,PATINDEX('%[0-9]%',@str),1)
set @str = RIGHT(@str, LEN(@str) - PATINDEX('%[0-9]%',@str))

END

RETURN @inte
END