Rules are deprecated, what's instead (TSQL)?

Question

Rules (Transact-SQL)[1] are reusable what permitted to overcome the shortcoming of non-re-usability of check constraints.

And now I read [1] that:

Answer 1

If you're concern is you want to write the "code" to constrain once and re-use it on multiple columns, I suggest you do the following:

Create a function with your constraint rules:

CREATE FUNCTION schema.PositiveInteger(INT val)
RETURNS INT AS
BEGIN
    IF (val > 0) RETURN 1
    ELSE RETURN 0
END

Add that function as a constraint to the column:

ALTER TABLE tbl ADD CONSTRAINT chkMyRules CHECK (schema.PositiveInteger(tbl.IntColumn) = 1);

The best part about this is, you can now write re-usable rules that take into account multiple columns.

CREATE FUNCTION ... (INT val, DATETIME date) RETURNS INT AS ......
ALTER TABLE tbl ADD CONSTRAINT chkMultipleCols CHECK (func(col1, col2) = 1);

Enjoy!