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Re: [dali-dev] Dali comments regarding generated artifacts/wizards
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Thanks for your feedback Tom. Here are some responses for you:
Project/Persistence Unit creation
1) The request for a schema to be written out to the orm.xml as the
default for the persistent unit sounds like a good idea. Please enter
an enhancement request for this feature in bugzilla if you could. -
https://bugs.eclipse.org/bugs/enter_bug.cgi?product=Dali%20JPA%20Tools
2) Unfortunately Dali 1.0 will likely not explicitly support multiple
persistence units per project. There is a lot of complexity that is
introduced with multiple persistence units in a single project having to
do with validation and defaulting, among other things. As of now, our
1.0 version will support one persistence.xml per project and one
persistence unit per persistence.xml.
3) This functionality is in the plan for 1.0.
4) Dali 1.0 will have a "Platform" concept that will deal with this and
many other issues regarding vendor specific functionality
Generate Entities
1) This is in the plan for Dali 1.0 as well, but you may want to add an
enhancement request to express adopter interest in this. Without
support for multiple persistence units, this may not make as much sense,
but still may be a reasonable thing to do.
Entity Generation Customization
For these items, I think there are a couple of different ways they could
be handled. Ideally, enhancement requests would be filed for these
items and the Dali team would evaluate whether or not a given request is
suitable for the base code, or whether this is something better left to
an extender's code base. If it is a good fit for Dali, a code patch for
the functionality would be submitted to the ER and then evaluated for
inclusion in the base.
Hope this helps,
Neil
Tom Mutdosch wrote:
Hi all,
I've been using Dali for a while and I think it is very nice. I have
a few questions that I thought someone might be able to answer or
comment on as I'm looking to write some tooling around generated
entities. Keep in mind that I'm currently using Dali 0.5 since the
2.0 milestones did not yet have the ability to add persistence to the
project. So if some of these things have already been added to the
latest codebase (and I'm sure many have), I apologize in advance. :)
* The Add Persistence dialog
1) Schemas - Setting the schema here currently does not seem to have a
lot of impact. It looks like it is used primarily as the default for
when later generating entities, and for validating the generated
entities. Generating entities from multiple schemas or connections
does not seem to be supported here. Could there be an option for the
selected schema to be written out to the orm.xml as the default schema
for that persistence unit? <persistence-unit-defaults>
<schema>ADMINISTRATOR</schema>
</persistence-unit-defaults>
This is a requirement when using DB2 for instance, and it might be
nice to be able to assist the user here.
2) Multiple persistence units. Could the Add Persistence be used more
as a Add Persistence Unit dialog that could be launched at any time?
This way, a user could add multiple persistence units to handle
entities that from multiple connections or schemas. And as mentioned
above, it might be nice to be able to specify that for a particular
persistence unit, you want the schema name generated into a
mappings.xml file (and reference that from the persistence.xml) or
instead that you want your entities generated with a schema tag on the
@table annotation.
3) Connection info. Since the connection information is collected
here, it might be nice if the connection info could be generated into
the persistence.xml for the user. Perhaps you could be prompted to
specify a datasource name, or to instead have the connection
information generated directly into the persistence.xml (for
non-datasource, driver-managed connections).
4) Persistence providers. Could the persistence provider be made a
dropdown with a list of common persistence providers (and perhaps made
to be able to programatically add new providers)? This would make it
much easier to select a provider and have it generated into your
persistence.xml.
* The Generate Entities dialog
1) Schema/Connection. It might make sense to be able to select the
Connection and Schema at this time as well. It could of course
default to the connection/schema initially selected, but seems
restrictive to only allow show entities from the originally chosen
connection/schema. Or perhaps you could select which existing
persistence unit you want to generate entities from.
* Entity generation customization.
It is easy enough to tailor your entities after they have been
generated using the annotation property pages, but I think that there
could still be some useful options that can be set up front in the
wizard.
1) Columns. It could be helpful to see the Database columns from the
table you have selected. Perhaps you do not want fields/accessors
generated for all columns (as your application does not require them).
2) Primary Key. It might be nice to be able to specify a column to use
for a primary key in the case where one is not explicitly specified in
the database table. Or to be able to choose multiple columns for a
compound key. Also, you could select the column to be used for Auto
Key Generation.
3) Optimistic Concurrency. You could select a concurrency column
(generated with an @version annotation).
4) Relationships. It would be nice to see relationships for a
selected table, as well as the ability to add additional relationships
to other tables (that are specified in the database via foreign keys)
5) Additional constructors. In addition to the default constructors,
it might be nice to be able to generate a constructor that takes in
the primary key values since they always need set anyway. Or
constructor that takes in all values for required non-null values.
And that's about it! :) If some of these things have already been
implemented or are in the plans (or there are no plans), please let me
know. Or if the right way to do something is to handle it myself
programatically (by extending EntityGenerators, etc) that would be
appreciated too. Thanks for any information that can be provided.
Tom
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