It should be quite straight forward. To show it works, I have just tested
with 2 model, each point to their own db. It works as expected :)
The testing environment however is mysql, and wo5.2.4, with plain vanila
without PW. Don't think it is matter for test.
Just to add, the database url are defined in each model.
Cheers
Cheong Hee
----- Original Message -----
From: "Joe Little" <[email protected]>
To: "Cheong Hee (Gmail)" <[email protected]>
Cc: "David LeBer" <[email protected]>; "WO Dev Group"
<[email protected]>
Sent: Friday, August 06, 2010 1:07 PM
Subject: Re: two different databases at same time?
I just checked and my models do indeed have a complete URL, etc in
their default connection dictionaries.
On Thu, Aug 5, 2010 at 7:57 PM, Cheong Hee (Gmail) <[email protected]> wrote:
Will there make any difference if these connection dictionaries is defined
in respective model db url?
----- Original Message ----- From: "Joe Little" <[email protected]>
To: "Joe Little" <[email protected]>
Cc: "Cheong Hee (Gmail)" <[email protected]>; "David LeBer"
<[email protected]>; "WO Dev Group"
<[email protected]>
Sent: Friday, August 06, 2010 2:17 AM
Subject: Re: two different databases at same time?
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 <[email protected]> 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 \(Gmail\)" <[email protected]>
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"
<[email protected]>
To: "Joe Little" <[email protected]>
Cc: "Cheong Hee" <[email protected]>; "WO Dev Group"
<[email protected]>
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
<[email protected]> 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 <[email protected]> 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"
<[email protected]>
To: "Cheong Hee" <[email protected]>
Cc: "WO Dev Group" <[email protected]>
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"
<[email protected]>
To: "James Cicenia" <[email protected]>
Cc: "WO Dev Group" <[email protected]>
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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