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From "Weddle, Anthony" <Anthony.Wed...@bluescopesteel.com>
Subject RE: Reengineering Overwrites
Date Thu, 09 Apr 2009 20:14:58 GMT
Sorry, Robert, but I don't get any operations that have the direction of
DB to map. For example, using the a Derby database, I added an attribute
to a table called "EXTRA", in Modeler, and added a new table,
"RESTAURANTS", to the database (using ij in Eclipse). These are the
operations that Migrate gave me:

To DB | Add Column | EXTRA.ANOTHER_FLAG
To DB | Drop Table | RESTAURANTS

And that's it. I tried a similar change with an Oracle DB and still
didn't get any operations for pulling DB changes into the map.

But our situation is a little different from this example. We will
rarely add tables but we will alter columns and sometimes add columns.
In the meantime, we'd also make changes to the ObjEntity, such as
changing the Java type, or the optimistic locking flag, or a
relationship delete rule, or how keys are generated. So, we'd like to
have the capability to pull in database schema changes but keep the
local customisations that we've made, without a lot of manual work. We
have that capability now (though it's slow) with Middlegen and so
wouldn't lightly give it up. However, I do prefer Modeler for making
those customisations and for generating the class source files.

Cheers,
Tony

-----Original Message-----
From: Robert Zeigler [mailto:robert.zeigler@roxanemy.com] 
Sent: Friday, 10 April 2009 7:40 a.m.
To: user@cayenne.apache.org
Subject: Re: Reengineering Overwrites

Check out the "direction" column of the "Select Operations" table.  It  
will allow you to choose the direction of the change, and thereby  
alter the operation performed (if there's a relationship in the  
modeler but not in the db, then to db direction will add a  
relationship to your db, and changing that to to model will change teh  
add relationship to drop relationship).

Robert

On Apr 9, 2009, at 4/92:31 PM , Weddle, Anthony wrote:

> Thanks for the tip, John and Robert. However, I'm not sure that  
> reverse
> capability is there in 3.0M5. If I select Migrate DB, I only get
> operations in the direction of the database to select. For example, I
> altered a table in the map and also added a table on the database; the
> two operations that Migrate gave me to select were to add the map  
> change
> to the database and the drop the table I just created. There were no
> operations that provided the DB to map direction.
>
> Maybe this functionality is not there in M5?
>
> If there was an option to migrate either way, I'm not sure it would
> help, since I'd want to merge changes. I'd want to keep any changes to
> ObjEntities that I make in Modeler and merge in any database changes
> (such as new tables, new columns, altered column definitions, deleted
> columns) to the map.
>
> Unfortunately, these kinds of operations are not uncommon here and so
> this would likely be a major issue for us. However, being a newbie at
> Cayenne, I may not fully understand the capabilities.
>
> Tony
>
> -----Original Message-----
> From: siberian@siberian.org [mailto:siberian@siberian.org] On Behalf  
> Of
> John Armstrong
> Sent: Thursday, 9 April 2009 5:56 p.m.
> To: user@cayenne.apache.org
> Subject: Re: Reengineering Overwrites
>
> Under to Tools menu in the modeler you can select the 'Migrate
> Database Schema' command.
>
> This will diff the db against your current current map. You can then,
> per change, decide if you want to take the DB version, the Cayenne
> version or ignore.
>
> Its the best feature ever, I use it daily.
>
> This may not be what your looking for..
> John-
>
>
>
>
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NOTICE - This message and any attached files may contain information that is confidential,
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If you are not the intended recipient or the person responsible for delivering the message
to the intended recipient, be advised that you have received this message in error. Any dissemination,
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