can someone help me to find a step-by-step example for developing JDO in a gwt project?
I really want to know and learn the jdo and differences between that and jpa
RGDS
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can someone help me to find a step-by-step example for developing JDO in a gwt project?
I really want to know and learn the jdo and differences between that and jpa
RGDS
I have used both jdo and jpa. I find it much easier using jpa for my work. If you are using datanucleus then you should look at the documentation on app engine located below.
JDO
https://developers.google.com/appengine/docs/java/datastore/jdo/overview-dn2
JPA
https://developers.google.com/appengine/docs/java/datastore/jpa/overview-dn2
These are the newer specs for app engine and if you are not using these then just about any database should be fairly straight forward.
I personally use jpa, request factory, service locators and a Dao pattern for accessing my objects. Here is something I posted earlier that has some code samples that may help. If you are not using app engine then a normal Long key should be easier.
GAE Datastore with GWT, making more friendly/smaller keys
You should also look at using a Servlet Filter for handling your EntityManager so that requestfactory can handle fetching your object graph using the .with(“childGetterMethod”) clause. This will save you quite a bit of coding to fetch child entities while the servlet filter handles opening and closing your entity manager.