[google-appengine] Re: Persisting Enum values?
Hi:
I'm not sure about this, but my understanding was that JDO didn't support
ENUMS, JPA does (but I may be wrong).
Cheers,
Albert Attard
Joan Crawfordhttp://www.brainyquote.com/quotes/authors/j/joan_crawford.html
- I, Joan Crawford, I believe in the dollar. Everything I earn, I
spend.
2009/8/3 Jeff S (Google) j...@google.com
Hi Tom,
It should be possible to persist objects that use enums without needing to
do your own additional mapping. I talked this over with Max Ross who
frequents the Java runtime discussion group (
http://groups.google.com/group/google-appengine-java) and he pointed out
an example in the JDO unit tests which uses enums:
http://www.google.com/codesearch/p?hl=ensa=Ncd=2ct=rc#79kbA0UmWLw/trunk/tests/org/datanucleus/test/HasEnumJDO.java
http://www.google.com/codesearch/p?hl=ensa=Ncd=2ct=rc#79kbA0UmWLw/trunk/tests/org/datanucleus/test/HasEnumJDO.javaThank
you,
Jeff
On Thu, Jul 30, 2009 at 5:09 PM, Tom Ball tball...@gmail.com wrote:
We have a simple task object, currently persisted using JDO (using App
Engine, of course). We'd like to add a GREEN/YELLOW/RED status enum state.
Defining the enum class is easy:
public enum Status {
NONE(none), GREEN(green), YELLOW(yellow), RED(red);
private final String label;
Status(String label) {
this.label = label;
}
public String getLabel() {
return label;
}
}
We're stumped how to make this class persistent using JDO -- foreign keys
for the labels, perhaps? Or do we get it for free, perhaps by JDO storing
the enum ordinal?
Tom
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[google-appengine] Re: Persisting Enum values?
I'm not sure about this, but my understanding was that JDO didn't support ENUMS, JPA does (but I may be wrong). Try this http://db.apache.org/jdo/field_types.html It's ok to be wrong ;-) --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~--~~~~--~~--~--~---
[google-appengine] Re: Persisting Enum values?
Cheers mate. The documentation I've read otherwise ( http://www.jpox.org/docs/1_2/jdovsjpa.html) but good to know that these are supported. Cheers, Albert Attard Ogden Nash http://www.brainyquote.com/quotes/authors/o/ogden_nash.html - The trouble with a kitten is that when it grows up, it's always a cat. 2009/8/4 datanucleus andy_jeffer...@yahoo.com I'm not sure about this, but my understanding was that JDO didn't support ENUMS, JPA does (but I may be wrong). Try this http://db.apache.org/jdo/field_types.html It's ok to be wrong ;-) --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Google App Engine group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~--~~~~--~~--~--~---
[google-appengine] Re: Persisting Enum values?
Hi Tom,
It should be possible to persist objects that use enums without needing to
do your own additional mapping. I talked this over with Max Ross who
frequents the Java runtime discussion group (
http://groups.google.com/group/google-appengine-java) and he pointed out an
example in the JDO unit tests which uses enums:
http://www.google.com/codesearch/p?hl=ensa=Ncd=2ct=rc#79kbA0UmWLw/trunk/tests/org/datanucleus/test/HasEnumJDO.java
http://www.google.com/codesearch/p?hl=ensa=Ncd=2ct=rc#79kbA0UmWLw/trunk/tests/org/datanucleus/test/HasEnumJDO.javaThank
you,
Jeff
On Thu, Jul 30, 2009 at 5:09 PM, Tom Ball tball...@gmail.com wrote:
We have a simple task object, currently persisted using JDO (using App
Engine, of course). We'd like to add a GREEN/YELLOW/RED status enum state.
Defining the enum class is easy:
public enum Status {
NONE(none), GREEN(green), YELLOW(yellow), RED(red);
private final String label;
Status(String label) {
this.label = label;
}
public String getLabel() {
return label;
}
}
We're stumped how to make this class persistent using JDO -- foreign keys
for the labels, perhaps? Or do we get it for free, perhaps by JDO storing
the enum ordinal?
Tom
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