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Re: [eclipselink-users] Defaults for @Table and @Column names

Thanks Shaun. This is pretty much exactly what I need. It would be great if this type of thing were introduced into the spec -- thanks for passing it along to Mike.

Since we are on the topic, do you know if other JPA implementations have similar proprietary hooks?


Shaun Smith wrote:
Hi Nate,

EclipseLink implements the defaults according to the JPA spec but you can use a customizer to override those defaults. I've attached a quickly thrown together example. It doesn't cover all the cases but should give you an idea of what you can do. In my example I prefixed all table names with "T_" but you can do the camel to underscore conversion instead.

The essential idea is to use a session customizer to change the default table names after EclipseLink has set them. The customerizer is "model.MyCustomizer" and it's enabled by adding <property name="eclipselink.session.customizer" value="model.MyCustomizer"/>
 to the persistence.xml.

I'm not sure if the JPA 2.0 spec will support a pluggable or configurable Java name/Database naming strategy but I've passed your email on to Mike Kieth who's on the JPA expert group.


natjohns wrote:

Does anyone know if there is a way to change the way that JPA (or the eclipselink implemenation) generates default names for tables and columns when using the @Table and @Column annotations? Or if this is being talked about for version 2 of the JPA spec?

What I'd like is something similar to what Grails does, where they change the camel capped Java names to underscores. Here's an example:

Say you have an EmployeeInfo class and one of the members is defaultHomePhoneNumber.

Current Default in JPA:


It's kind of hard to read. If we could specify a policy, say the camel caps to underscore policy, it would look like this:

Table name:  EMPLOYEE_INFO

Thanks all! And I apoligize if this has been talked about already... I couldn't find anything in the searches.

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