Re: two different databases at same time?
Re: two different databases at same time?
- Subject: Re: two different databases at same time?
- From: David Avendasora <email@hidden>
- Date: Thu, 1 Apr 2010 08:38:54 -0400
On Apr 1, 2010, at 8:23 AM, David LeBer wrote:
>
> 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.
I think you can fetch on them, you just can't qualify the fetch. It's an all-or-nothing thing.
You can't have cross-model inheritance structures either, I don't believe.
Dave
>
>>
>> Cheers
>>
>> Cheong Hee
>>
>> ----- Original Message ----- From: "Mark Ritchie" <email@hidden>
>> To: "James Cicenia" <email@hidden>
>> Cc: "WO Dev Group" <email@hidden>
>> 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.
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> ;david
>
> --
> David LeBer
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