I have started fooling around with Lift and I wanted to use it on a project that interacts with my legacy database. I have already went through the trouble of getting a Hibernate configuration to work with this database.
So I was wondering if it is possible to build a Lift project that uses the Hibernate code that I have already written. Can anyone show me any good examples or tutorials of that?
You can use any ORM with lift, including Hibernate. There is a full example using JPA and hibernate here
If you have some more questions about that example, you may want to try the Lift mailing list , where the developer who wrote can be reached.
Related
I am trying to build a basic CRUD application with NetBeans 7.4, JSF, PrimeFaces and JPA using MySQL.
I have successfully done this by using the NetBeans wizards. I want to do this from scratch, no wizards.
There seems to be a lack of support for the combo of JSF, PrimeFaces and JPA. When I say "lack", I mean a full example (I might be asking too much), without using the CRUD auto-gen templates/classes AND shows actual queries coded and passed to the datatables(primefaces). YouTube is full of non-English speaking examples using Hibernate (not JPA) and other examples that show flashy GUI's with no code.
So far I understand you need an #Entity class (provides the physical build of the tables), a Controller (serializable) and the .xhtml web page to show the datatable.. what else? Also, I'm not seeing any posts or examples where queries are using with JPA/JSF and how they are tied together (in one place). I need to connect the dots here so that I can leverage JSF/JPA to create simple queries to populate my PF DataTables. I've read the blogs and I've googled the intranets until I'm blue in the face. Sending me a list of URL's to read to learn about each product is something I've already done. I get what they do independently, but am looking for the "How do they all connect" answer with maybe some basic code examples!! :)
Since version 11, PrimeFaces comes with a JpaLazyDataModel which you can use with your p:dataTable. In its simplest form to be used like:
new JpaLazyDataModel<>(MyEntity.class, () -> entityManager);
See also:
DataTable documentation on JpaLazyDataModel
Source code
I think this should help you:
http://www.tutorialspoint.com/jsf/jsf_tutorial.pdf
Tung
look.If you need an example about CRUD operation using JPA/EJB as Model layer and JSF as view layer,you can see the follwing example:
http://uaihebert.com/?p=834
also my own blog is based on many examples explaining this.These examples are using JPA2/EJB3 as model and JSF2 and primfaces as view you can see
http://jsfspotlight.blogspot.com/2013/05/jsf2ejb3-preparing-your-environment.html (this post for explaining how to prepare your environment before developing EJB/JSF Applications
http://jsfspotlight.blogspot.com/2013/05/ejbjsf-master-detail-web-application-in_25.html
(in this post i explain in details how to create EJB/JSF master_detail Application including what you need about connecting model and view layers)
explore the blog for more examples
Try this archetype which will create you an example and then check how it is implemented: https://github.com/ignl/happyfacescrud. You will learn about Spring, Spring security, Spring WS, JPA and Hibernate, Spring data and QueryDsl for easier querying, and custom JSF components which will make you very productive jsf developer.
The firm I just started at has to take about 200 MySQL tables and make Java, Hibernate Beans from them. We are working on Spring MVC Web projects. Does anyone know of any tool or product that will credit the Java code for us from mySQL tables>
Eclipse (and Hibernate Tools) has a lot of functionality for auto-generating code. I assume the other IDE's do as well. Walk-through: http://www.wikihow.com/Generate-Hibernate-Pojo-Classes-from-DB-Tables
New to Java EE6 and I'm trying to set up a JDBCRealm. Many of the examples suggest making the tables that hold user/group information by hand in SQL.
Is there a more standard "JPA" way of doing it though? The tables Glassfish expects don't fit with the kind of table structures you'll end up with if you use e.g. a OneToMany mapping (which is what I was hoping I could use).
I read Glassfish still uses JDBC to accomplish the JDBCRealm, which would explain why. And I came across this blog which suggests a way to do it with JPA.
http://www.codeproject.com/Articles/238779/J2EE-JDBC-based-authentication-with-JPA-Entities-i
But is there an 'official' way to do it with JPA? I want to make sure I follow best-practice to ensure I have a secure application.
Thanks
A few months ago i wanted to create my JDBC Realm with glassfish and i also had lots of doubts. I will try to explain you more or less how i did it using JPA.
Many of the examples suggest making the tables that hold user/group
information by hand in SQL
I disagree, if you are using JPA for other tasks related to persistence why would you make an exception when regarding to security. So JPA is a good idea. Copy/Pasting a chunk of SQL in your DB console is easy but better if you have entities that will automatically will always create those tables for you when you deploy your app.
The tutorial you are following is fine, i think there is no such think as a best practice.
I will give you some resources that i think will help you creating the JDBC realm.
Maybe you are interested in something a bit more simple, just to warm up, in that case have a look at this post:
http://javing.blogspot.in/2012/05/here-in-this-video-you-can-see-how-i.html
It talks about ROLE based security in glassfish, i think it can give you some tips.
If you want to know how to create the JDBC realm with JPA, follow this question i made time ago, at the end you will find the solution:
Glassfish 3 security - Form based authentication using a JDBC Realm
If you paste some code we could help you trouble shouting in case you get stuck.
I went to an interview into a IT consultancy company last friday.
The Interviewer asked me about my project and what was my participation in it.
Suddenly he threw one question on hibernate. His question was as follows
"If i have an project which has been developed in an MVC architecture using Java EE environment, but using JDBC for Database interaction, how will i integrate Hibernate into it. I don't want to disturb the existing code, all the previous JDBC code should be intact. "
I told him that we an add all the features of hibernate in the existing code, as it only requires Config files, Entities thats it. The old code of JDBC may itself be using Datasourse for getting connection, the same datasourse can be looked up using JNDI to build a session factory in Hibernate, not a big deal.
But the interviewer was not happy with my answer, he needed some more explanation.
I was not able to impress him.
So can you please suggest what should be the probable answer for the above question.
Or at least give me one hint so that i can come to an answer.
I think he wanted answer like the following.
Typical application design requires layers separation. There are the following classic layers: web tier, business logic and DB. There is a thin layer named DAO (Data Access Objects) that is written in java and plays a role of "middleman" between business logic and DB. It sounds that this tier is implemented using plain JDBC.
So, there is not a problem to replace this and only this layer with Hibernate based one.
Now you can add more details about how you are configuring Hibernate and integrate it with the rest of your application.
Not an exact answer and you did not mention which framework your application use but if your application uses Spring framework, this my question and its answer's will be helpful to you but my question is reverse as I wanted to integrate jdbc with hibernate.
I think he was probably looking for you to explain how you might:
put Hibernate wrappers around existing SQL queries, or
create Hibernate bindings for legacy SQL tables, or
integrate Hibernate and classic JDBC using container-level transactions.
(It is clear that he was not asking about how you would replace the old JDBC code with Hibernate code ...)
But of course, you'd really need to ask him what knowledge / experience he was expecting you to demonstrate in answering the question.
I'm learning hibernate and I am running into some issues. I'm reading "Harnessing Hibernate" by O'Reilly. They explain everything using ANT, but since I want to avoid writing a huge build.xml file, I'm trying to get it to work with IntelliJ.
I managed to make a mapping according to a DB table in a MySQL database, and wrote the bean for it. It worked, but I can't find any information on how to generate beans and SQL code, or how to reverse engineer with IntelliJ. I found loads of tutorials about Eclipse, using JBOSS Hibernate tools plugin, and the site claims this support for generating code is already in the standard installation of IntelliJ.
Am I forgetting some configuration such as adding libraries? I'm trying to find this out but I'm desperate now. Please don't suggest me to use Eclipse, I need IntelliJ for my current role.
AFAIK, IntelliJ IDEA includes the complete JPA/Hibernate support in its Ultimate Edition:
Generating Persistence Mappings from Database Schema
IntelliJ IDEA allows you to quickly
generate persistence mappings from any
database schema: Generating
Persistance Mappings
(source: jetbrains.com)
Now, the question is, what edition of Intellij IDEA are you using?
If you add the hbm2ddl to your Hibernate config and ask it to create the database schema you'll get it by running a single test or some other code that exercises Hibernate. Once you have it, turn off create.
Let Hibernate do the work.