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From "Alex Kolonitsky (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CAY-1946) CDbimport improvements
Date Thu, 28 Aug 2014 09:02:13 GMT
Alex Kolonitsky created CAY-1946:
------------------------------------

             Summary: CDbimport improvements
                 Key: CAY-1946
                 URL: https://issues.apache.org/jira/browse/CAY-1946
             Project: Cayenne
          Issue Type: Improvement
          Components: Non-GUI Tools
            Reporter: Alex Kolonitsky


We’ve experimented with automated db-first approach to Cayenne modeling for more than a
year on a set of client projects. Roughly this approach means that DB evolution is managed
via external tools (e.g. liquibase) and Cayenne artifacts are managed using the following
POM configuration:

<plugin>
	<groupId>org.apache.cayenne.plugins</groupId>
	<artifactId>maven-cayenne-plugin</artifactId>
	<configuration>
		...
	</configuration>
	<executions>
		<execution>
			<id>default-cli</id>
			<goals>
				<goal>cdbimport</goal>
				<goal>cgen</goal>
			</goals>
		</execution>
	</executions>
</plugin>

“cdbimport” ensures that Cayenne model is always in sync with DB, “cgen” - that Java
classes are in sync with the model. There are zero problems with “cgen", not so with “cdbimport".
If you control the schema, you get a decently named Java classes/properties in 95% of the
cases. Here we are trying to address the remaining 5% that make things ugly:

* Inability to generate meaningful relationship names in many cases.
* Inability to customize attribute/relationship names and data types.

To solve this here we are proposing a merge algorithm that would preserve customizations to
the Obj* layer made by the user. And in addition to that a special descriptor that can be
used for more advanced filtering and customization of cdbimport process. Both of these improvements
will hopefully result in “cdbimport” becoming a tool of choice for Cayenne work for many
users.

https://docs.google.com/document/d/1DF5-_mMDCuH7iUFhEFDm2q-ebVeSPgvOaymho88ywJ0/edit?pli=1



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