On 2011-04-07, at 7:02 AM, Amedeo Mantica wrote: > do you insert the Enterprise Object in the Editing Context immediately after > creation or when submitting form ?
Create and insert together, always. Follow the commandments: <http://wiki.objectstyle.org/confluence/display/WO/EOF-Using+EOF-The+EOF+Commandments> > > > On 07/apr/2011, at 12.39, Pascal Robert wrote: > >> >> Le 2011-04-06 à 23:48, Chuck Hill a écrit : >> >>> 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. >> >> Example for H2: >> >> try { >> editingContext().saveChanges(); >> } catch (EOGeneralAdaptorException ex) { >> EOAdaptorOperation operation = >> (EOAdaptorOperation)((NSMutableArray)ex.userInfo().valueForKey("EOAdaptorOperationsKey")).objectAtIndex(0); >> if (operation.exception().getMessage().contains("Unique index or primary >> key violation")) { >> throw new SomeException(); >> } >> >>> 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 >>>>> _______________________________________________ >>>>> Do not post admin requests to the list. They will be ignored. >>>>> Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) >>>>> Help/Unsubscribe/Update your Subscription: >>>>> http://lists.apple.com/mailman/options/webobjects-dev/pyu%40mac.com >>>>> >>>>> This email sent to p...@mac.com >>>> >>>> _______________________________________________ >>>> Do not post admin requests to the list. They will be ignored. >>>> Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) >>>> Help/Unsubscribe/Update your Subscription: >>>> http://lists.apple.com/mailman/options/webobjects-dev/chill%40global-village.net >>>> >>>> This email sent to ch...@global-village.net >>> >>> -- >>> 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. >>> http://www.global-village.net/products/practical_webobjects >>> >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> Do not post admin requests to the list. They will be ignored. >>> Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) >>> Help/Unsubscribe/Update your Subscription: >>> http://lists.apple.com/mailman/options/webobjects-dev/probert%40macti.ca >>> >>> This email sent to prob...@macti.ca >> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) >> Help/Unsubscribe/Update your Subscription: >> http://lists.apple.com/mailman/options/webobjects-dev/amedeomailing%40insigno.it >> >> This email sent to amedeomail...@insigno.it >> > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/webobjects-dev/dleber_wodev%40codeferous.com > > This email sent to dleber_wo...@codeferous.com ;david -- David LeBer Codeferous Software 'co-def-er-ous' adj. Literally 'code-bearing' site: http://codeferous.com blog: http://davidleber.net profile: http://www.linkedin.com/in/davidleber twitter: http://twitter.com/rebeld -- Toronto Area Cocoa / WebObjects developers group: http://tacow.org _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
