MYSQL custom function to determine whether it is a positive integer example code

You can write a function: Mainly use regular expressions to make judgments. If the input character is empty, use "-" to replace it.

CREATE FUNCTION [dbo].[svf_NonNegativeInteger] (
 @val NVARCHAR(4000)
) RETURNS BIT
AS
BEGIN
  DECLARE
  @rtv BIT = 1
  SET @val = ISNULL(LTRIM(RTRIM(@val)), N'-')
  IF @val LIKE '%[^0-9]%' OR @val = N''
   SET @rtv = 0
  ELSE
   SET @rtv = 1
  RETURN @rtv
END

Example description:

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