On 01/03/2018 17:21 , Ron Johnson wrote:
> On 03/01/2018 02:08 PM, marcelo wrote:
>>
>>
>> On 01/03/2018 16:42 , Ron Johnson wrote:
>>> On 03/01/2018 01:11 PM, marcelo wrote:
>>>>
>>>> On 01/03/2018 16:00 , Ron Johnson wrote:
>>> [snip]
>>>>> If your only unique index is a synthetic key, then you can insert
>>>>> the same "business data" multiple times with different synthetic
>>>>> keys.
>>>>>
>>>>>
>>>>> --
>>>>> Angular momentum makes the world go 'round.
>>>> IMHO, business logic can and must preclude "garbage insertion".
>>>> Except you are inserting data directly to database using SQL, any
>>>> n-tier architecture will be checking data validity.
>>> bl
>>> Any n-tier architecture that's bug-free.
>>>
>> Do you know about unit testing?
>
> Way Back When Dinosaurs Still Roamed The Earth and I first learned the
> trade, the focus was on proper design instead of throwing crud against
> the wall and hoping tests caught any bugs. Because, of course, unit
> tests are only as good as you imagination in devising tests.
>
>
So, you are fully convinced that there´s no bug free software... Same as
I (and you) can code following the business rules, you (and me) can
design unit tests not from "imagination" but from same rules.
Moreover: you can have a surrogate key (to speedup foreign keys) and
simultaneously put a unique constraint on the columns requiring it.
What´s the question?
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