Hi Peter, I don't know if you are interested in none standard mapping technologies.
We are using EMF for our domain models and have written our custom mapping (generated out of a DSL). The main structure of usage can be seen in [1] and working similar to MyBatis but the idea is: a) each domain object has a Mapper-Interface [2] b) the mapper interface with the database (select,update,insert,delete) c) the mappers internally communicate e.g. to lazily load attributes see e.g. [3] The nice thing about it is that domain code only knows the mapper & domain objects but has no idea how the mapping to the database really works. The complete system is using OSGi-Services for configuration (e.g. db-connection), extensions (which mappers are available) and customization (use a different connection pooling tech, caching lib, bytecode weaver, ...). There are currently 2 "hacks" to run on OSGi: * c3p0 does not allow me to set a classloader to load the SQL-Driver so i had to create a fragement to get the JDBC-Driver in. * cglib would use the wrong classpath so we are setting our customer classloader In our case we have a DSL to generate the mappers from them e.g.[4] for the Person mapping but one could write this by hand if someone wants to ;-) Like I said it's fairly special solution but works very well for us maybe it is interesting to you. For is improved performance & memory footprint against Hibernate which we used before significantly! Tom [1]https://github.com/BestSolution-at/emap/blob/master/at.bestsolution.persistence.sample/src/at/bestsolution/persistence/sample/ContactBookSample.java [2]https://github.com/BestSolution-at/emap/tree/master/at.bestsolution.persistence.sample.model.emap/src-gen/sample [3]https://github.com/BestSolution-at/emap/blob/master/at.bestsolution.persistence.sample.model.emap/src-gen/sample/java/PersonMapperFactory.java [4]https://github.com/BestSolution-at/emap/blob/master/at.bestsolution.persistence.sample.model.emap/src/sample/Person.emap On 25.11.13 13:41, Peter Kriens wrote: > I am doing some research on OSGi and persistence and I find the whole Java > persistence story quite confusing and complex. Part of my problem is that I > see lots of frameworks but it is quite hard to see code that really uses > those frameworks. Virtually all tutorials and examples look highly contrived > and seem to totally ignore issues like caching, security and seem to be > rather lax concerning transactions. > > I wonder if people in this forum could share with me a typical production > source file showing: > > How entities are defined > The persistent use of the entity, i.e. the part where the SQL will be > generated. I.e. places where the PersistenceManager, EntityManager, SQL > generation is used > How results are cached > > A single source or class file per issue is best. Adding a small description > how you use persistence (Aries, JPA, JDO, JDBC, etc), the primary issues you > face, and describe your environment is highly appreciated. > > I know from my own experience that there is often a feeling that your own > code is not up for showing to others but please send me the raw unadulterated > code; I need to see how it is today, not how you think it should be. > Obviously I am not interested in what the code does or where it is used so > feel free to remove comments (if any!) and change names. I am just looking > for a couple of hundred of real world samples to extract the patterns that > are actually popular in our industry. > > Obviously I will not share that code with anyone and treat it fully > confidential. Also would appreciate a little description how you use > persistence in OSGi. > > So in this case, do not ask what the OSGi can do for you, but for once, ask > what you can do for the OSGi! ;-) > > Please? Come on, it only takes 3 minutes. Send your 4 files to: > peter.kri...@aqute.biz > > Kind regards, > > Peter Kriens > > > > _______________________________________________ > equinox-dev mailing list > equinox-dev@eclipse.org > https://dev.eclipse.org/mailman/listinfo/equinox-dev > _______________________________________________ equinox-dev mailing list equinox-dev@eclipse.org https://dev.eclipse.org/mailman/listinfo/equinox-dev
