Re: Newbie question
Re: Newbie question
- Subject: Re: Newbie question
- From: Chuck Hill <email@hidden>
- Date: Wed, 06 Apr 2011 20:48:35 -0700
That is going to leave you with a race condition. The only certain way to prevent the creation of duplicates is to put an unique constraint on the database. Then you have to catch the database exception (EOGeneralAdaptorException) in your code and handle appropriately. The ugly part is that the exception message returned is different for each database which makes doing this in a database agnostic way slightly challenging.
Chuck
On Apr 6, 2011, at 8:21 PM, Paul D Yu wrote:
> Based on the column/attribute in your DB/EOModel that would make your consider the record/EO to be duplicate of another, you should implement a method that would check for those values in the existing set.
>
> I don't think there is a one line solution to what you are seeking.
>
> Paul
> On Apr 6, 2011, at 10:52 PM, Mr Tonnew wrote:
>
>> Hi,
>>
>> How do I avoid committing duplicate entries in the DB? I have a form
>> from where I take entries. Is there a single line of code that can
>> accomplish this?
>>
>> MR
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--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
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