So, I'm starting to wonder if something broke/changed in Wonder. I've set up
test projects that list two DBs in the Properties file for two models, but only
one is ever added to the connection dictionary. Does there need to workable
values for the default database in the eomodeld directory itself?
This has worked for me before, with one framework model and one local project
model. This time, i have two models in one framework.
On Aug 4, 2010, at 7:26 PM, Joe Little <jmlit...@gmail.com> wrote:
> You gave me a good clue. I may be using the same damn ec
>
> On Aug 4, 2010, at 7:17 PM, "Cheong Hee \(Gmail\)" <chn...@gmail.com> wrote:
>
>> When the question posted, I intended to find out if the different db works
>> in the same ec. I have not thought more on the storing and fetching.
>>
>> I am not sure if this is right but merely bring it out for better
>> understanding. Please point out whichever does not seem right:
>>
>> Said the Student table is in databaase A. The AdmitApplicant table is
>> stored in database B.
>> A row admitApplicantID is created in Student table and a relationship should
>> be defined, said admitApplicant. The modelling cross different database
>> should be fine.
>>
>> If I understand what David mentioned, the EOF fetch through relationship
>> admitApplicant will fail. Therefore, I will assume that the fetch will have
>> to be done by getting the admitApplicant key from Student, and then use the
>> key to search the AdmitApplicant that is resided in database B. Good thing
>> is both could be done in the same ec.
>>
>> Cheers
>>
>> Cheong Hee
>>
>> ----- Original Message ----- From: "David LeBer"
>> <dleber_wo...@codeferous.com>
>> To: "Joe Little" <jmlit...@gmail.com>
>> Cc: "Cheong Hee" <chn...@gmail.com>; "WO Dev Group"
>> <webobjects-dev@lists.apple.com>
>> Sent: Thursday, August 05, 2010 2:36 AM
>> Subject: Re: two different databases at same time?
>>
>>
>>
>> On 2010-08-04, at 2:26 PM, Joe Little wrote:
>>
>>> On Wed, Aug 4, 2010 at 11:20 AM, David LeBer
>>> <dleber_wo...@codeferous.com> wrote:
>>>>
>>>> On 2010-08-04, at 2:12 PM, Joe Little wrote:
>>>>
>>>>> Digging up an old thread. This is the first time I'm creating a
>>>>> multi-database relation. When my migrations kick off to generate my
>>>>> newer database that has a single relation to the old, it fails in
>>>>> spectacular ways.
>>>>>
>>>>> Specifically, it has this error:
>>>>>
>>>>> Caused by: java.lang.RuntimeException: Failed to execute 'ALTER TABLE
>>>>> STUDENT ADD CONSTRAINT STUDENT_admitApplicantID_ID_FK FOREIGN KEY
>>>>> (admitApplicantID) REFERENCES ADMIT_APPLICANT (ID) DEFERRABLE
>>>>> INITIALLY DEFERRED'.
>>>>> PSQLException: ERROR: relation "admit_applicant" does not exist
>>>>>
>>>>> student has a relation to admit_applicant, where student is
>>>>> db2.student and admit_applicant is db1.admit_applicant
>>>>>
>>>>> This is keyed off this migration line:
>>>>>
>>>>> studentTable.addForeignKey("admitApplicantID", "ADMIT_APPLICANT", "ID");
>>>>
>>>> Don't do that.
>>>>
>>>> EOF is fine with cross database relationships but your DB probably isn't.
>>>> So it won't like you trying to create a foreign key constraint to a
>>>> different database, so don't.
>>>
>>> So, what is the alternative? Would a join table work -- I think that
>>> still has foreign key constraints. Or is it simply stating a differ
>>> type of join (not inner)? I haven't done this before so my lack of
>>> clue is telling.
>>
>> Sorry, I wasn't clear. Model the relationship in the EOModel, create a
>> vanilla row in the db that will act as a foreign key for the relationship,
>> but don't tell the db that it is a foreign key. Let EOF manage the
>> relationship for you.
>>
>>>
>>>>
>>>>>
>>>>> Am I just missing some clue that others already have?
>>>>>
>>>>> On Thu, Apr 1, 2010 at 8:17 PM, Cheong Hee <chn...@gmail.com> wrote:
>>>>>> Apparently I have complicated it by thinking of using multi ec to handle
>>>>>> respective database connections. Thanks for clarification..
>>>>>>
>>>>>> Cheers
>>>>>>
>>>>>> Cheong Hee
>>>>>>
>>>>>> ----- Original Message ----- From: "David LeBer"
>>>>>> <dleber_wo...@codeferous.com>
>>>>>> To: "Cheong Hee" <chn...@gmail.com>
>>>>>> Cc: "WO Dev Group" <webobjects-dev@lists.apple.com>
>>>>>> Sent: Thursday, April 01, 2010 8:23 PM
>>>>>> Subject: Re: two different databases at same time?
>>>>>>
>>>>>>
>>>>>>
>>>>>> On 2010-04-01, at 12:07 AM, Cheong Hee wrote:
>>>>>>
>>>>>>> Is there any pointers or sample code how these could be done to initiate
>>>>>>> connection and save changes in respective ec?
>>>>>>
>>>>>> You don't need multiple ec's unless you want them. Other than that it's
>>>>>> transparent.
>>>>>>
>>>>>> EOEditingContext ec = ERXEC.newEditingContext();
>>>>>> Person p = (Person)EOUtitlites.createAndInsertInstance(ec,
>>>>>> Person.ENTITY_NAME); // Person entity persists in database A
>>>>>> Horse h = (Horse)EOUtitlites.createAndInsertInstance(ec,
>>>>>> Horse.ENTITY_NAME);
>>>>>> // Horse entity persists in database B
>>>>>> // make chagnes to h and p
>>>>>> ec.saveChanges(); // p saved to database A, h saved to database B
>>>>>>
>>>>>> You can model cross database relationships as long as you don't try and
>>>>>> create a fetch based on them.
>>>>>>
>>>>>>>
>>>>>>> Cheers
>>>>>>>
>>>>>>> Cheong Hee
>>>>>>>
>>>>>>> ----- Original Message ----- From: "Mark Ritchie" <mark.ritc...@mac.com>
>>>>>>> To: "James Cicenia" <ja...@jimijon.com>
>>>>>>> Cc: "WO Dev Group" <webobjects-dev@lists.apple.com>
>>>>>>> Sent: Thursday, April 01, 2010 1:05 AM
>>>>>>> Subject: Re: two different databases at same time?
>>>>>>>
>>>>>>>
>>>>>>>> On 31/Mar/2010, at 8:15 AM, James Cicenia wrote:
>>>>>>>>>
>>>>>>>>> Is it possible to use two different databases, I guess via two
>>>>>>>>> different
>>>>>>>>> models?
>>>>>>>>> I will need to connect to an Oracle big database on a remote server
>>>>>>>>> and
>>>>>>>>> was
>>>>>>>>> wondering if I could also use a mySQL or postgres database for user
>>>>>>>>> control
>>>>>>>>> on local server.
>>>>>>>>
>>>>>>>> Yes, yes! You can have multiple concurrent connections! One for each
>>>>>>>> EOModel!
>>>>>>>> Just make sure that the entity names are unique across all EOModels!
>>>>>>>> Good luck!
>>>>>>>> M.
>>>>>>>> _______________________________________________
>>>>>>>> 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/chng34%40gmail.com
>>>>>>>>
>>>>>>>> This email sent to chn...@gmail.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/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/jmlittle%40gmail.com
>>>>>>
>>>>>> This email sent to jmlit...@gmail.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
>>>>
>>>>
>>>>
>>>>
>>>>
>>
>> ;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
