T-sql - determine if value is integer

Question

I want to determine if a value is integer (like TryParse in .NET). Unfortunatelly ISNUMERIC does not fit me because I want to parse only integers and not every kind of number. Is there such thing as ISINT or something?

Here is some code to make things clear. If MY_FIELD is not int, this code would fail:

SELECT @MY_VAR = CAST(MY_FIELD AS INT)
FROM MY_TABLE
WHERE MY_OTHER_FIELD = 'MY_FILTER'

Thank you

Answer 1

declare @i numeric(28,5) = 12.0001


if (@i/cast(@i as int) > 1)
begin
    select 'this is not int'
end
else
begin
    select 'this is int'
end

Answer 2

The following is correct for a WHERE clause; to make a function wrap it in CASE WHEN.

 ISNUMERIC(table.field) > 0 AND PATINDEX('%[^0123456789]%', table.field) = 0