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Hi,

I wrote couple of queries using HQL, seems to me very powerful and good enough. Why people using createCriteria. I am just afraid I would miss something good of hibernate. Pros and Cons between these two?

thanks,

xiuping

They are both good. I would say it is up to your preferences. Criteria API works well in different kind of generic criteria builders. Because it is hierarchical by nature. Actualy, HQL builders can be built as well almost with the same effort. HQL is good when you have to create something more or less sophisticated and it is more clear to do with it, or something very specific to get better performance or just because it is easier to use for particular case. We desided to go with Criteria API in our app. It is more suitable for our needs vs. HQL. We have quite a few HQLs and propably we will convert them to Criteria later.

thank you very much for your kindly reply.

I will convert my HQL into createCriteria just to feel the difference.

BTW, once I put my description of the table information inside hbm.xml,
there should be a tool to be able to create the corresponding Java Object Class, right ?

Right now I manually wrote couple of getters and setters, it works. But I feel like hibernate should have tool to generate java class automatically , right? otherwise, why we need to specifiy inside hbm.xml?

sorry for my silly questions, I just started to learn hibernate. it is pretty cool.

regards,

xiuping

xyang, you have some tools to create java source from your hbm.xml
and, you have tools to create hbm.xml AND .java

you should try some eclipse plugins like Hibernate Synchronizer, MyEclipse, and Middlegen.
Hibernate tools includes hbm2java, an ant task that lets you do what you're looking for.

So, you can generate all of your hbm.xml, .java, and even hibernate.config.xml. You would just modify those files for fine tuning, if needed.

Greetings
Matías

thanks a lot for your advice.

I have found the Hibernate Synchronzier and downloaded and unzipped. I manually added those jar files into Eclipse Project property build path.

However, after that, from "File-New-Other" , I am not able to see "Hibernate", which means somehow my newly installed Hibernate Synchronizer didn't get hooked up with Eclipse.

I feel kind of stupid, spend an hour still no clue. Any one can help?

thanks a lot

xiuping

in fact, what I want to know is :

inside Eclipse 3.0, how can I make the newly installed "Hibernate Synchronizer" appears under "File -->New --->Other --->Hibernate",
right now, I can not see "hibernate" under "Other". But I do see other
stuff under "Other", I wonder how those items were made visible under "Other". I guess I need to do the similiar thing, but don't know how.

Anyone knows?

thanks,

xiuping

xyang, once you downloaded the plugin, you have to unzip the "plugins" folder inside the zip to the eclipse folder (you'll see that there's a "plugins" folder inside the eclipse folder). Than, restart eclipse and that's all.
You don't have to include the jars in the classpath.

Regards,
Matías

hi,

I figured out the installation, instead of unzip, I need to use "update site", that made Hibernate Synchronizer a plugin.

I also figured out how to use DB connection and refresh tables and create the .hbm file.

Seems to me it is hard to use this tool. Spent the whole afternoon.

Now I am trying to create the Java Object file based on the .hbm file, and I don't know how. ( Have not figured out yet).

Thanks for your reply.

xiuping

But it is so hard to use.

It generated bunch of other java classes which I don't need them. I am not sure if I am doing the right thing.

I really can't remember too much about Hibernate Sync, I haven't used it for a while. But I guess you're talking about de DAOs it generates.
HB Sync generates first de hbm.xml, then you right click on those files and chose Synchronize and it generates the java files.
Along with the POJOs, Data Access Objects are generated, so you can use them to retrieve, save, update and delete objects from the database. Take a look at those classes to find out exactly what they do.
It also generates a Base class for every POJO... that base class you should never modify, as it's synchronized and regenerated when you make some changes to the database. You should modify the POJO that inherits the base class.

I hope you understand me... ask for help again if my explanation is not clear enough.

You should also refer to Hybernate Synchronizer docs for further help

This hibernate synchronizer is not very good, it generates too much stuff, not clean. Since I am using Spring framework for transactions, I don't need those being generated.

Anyone knows that if hibernate itself provide a better tool to generate POJO source? I read the hibernate manual document, it mentioned there is a "Development Wizard", where can I get this "Wizard"?

thanks a lot,

xiuping