I have found one eclipse plugin (DB Importer) for Hibernate, which helps to generate annotation based Java Entity classes direct from data base. So that we no need to write any annotation configuration for hibernate Entities.It works very fine.
The tool is available here
I would like to know
Is this tool is really used in industries?
Is there any disadvantages by using this tool?
I am asking these questions because, i did not find much information regarding this tool.
Please correct me if i am asking wrong.
If you simply want to generate entities from an existing database, I think you are much better off using the hibernate tools which are created and maintained by the Hibernate team (see the reverse engineering tool).
It's been a while since I've used it but from memory you can invoke the reverse engineering from ant/maven/gradle or you can install the jboss tools eclipse plugin and invoke from eclipse. I'm sure you can allso invoke from the command line.
Related
I'm working on a small REST application server and I'm trying to be able to save a Java bean using DataNucleus JDO with MySQL.
My only problem is that I can't find any examples of any application that uses DataNucleus JDO and is built using Gradle.
I'm new to using Java and I have essentially no idea how to go about doing this. At this moment I'm just considering going with Hibernate JPA instead but I feel like JDO would be better for me in the long run. I would really appreciate any help pointing me in the right direction.
I followed Adrian's solution I found here with a minor edit: I modified the task to depend on processResources instead of compileJava and made classes depend on datanucleusEnhance, otherwise it didn't work for me.
I would normally tell you the error I got but I couldn't see the enhancer's error output.
The solution essentially calls an ant task to enhance the classes instead of using Gradle only. It's not the most elegant but it worked.
I have an older java application. It used hibernate and middlegen to create its classes. If I were to create the pojos today using hibernate. What would I use for a code generator? The middlegen website is dead, and I only saw on sourceforge something for Maven. Everything else is just gone. Thanks.
You can use the Hibernate-tools extensions available for Eclipse.
http://www.hibernate.org/subprojects/tools.html
You can also use AndroMDA http://www.andromda.org/index.html - It generates Code (Java, PHP, .NET,...) from UML Models (as XML Files).
You can choose to generate code for Hibernate, EJB, Spring, WebServices, and Struts or write own plugins.
It is a nice tool if you can get it running.
You can use IDE for that, e.g. Intellij Idea
Have you considered http://schemaspy.sourceforge.net/. This might be what you looking for.
I have to develop a java web application. For persistence, I am going to use hibernate.
I am a symfony2 developer and I like generating my entities using Doctrine 2 console.
So is there a similar tool for hibernate (or other well known Java ORM) that generates entities automatically ?
AFAIK, no, there are no entity generators on par with the ones in doctrine or rails.
However generating entities from existing tables can still be quite comfortable if you use eclipse. Take a look at this help page . The page itself is a bit outdated, but the functionality is still there. The menus will guide you nicely through property and relation mapping.
Other IDEs like IntelliJ and NetBeans probably have similar tools, but I am not familiar enough with them to advise.
You can use hibernate reverse engineering tool(Hibernate Tool) to generate Entity classes. What you need to do is to provide session factory configuration(it takes your hibernate.cfg.xml) and database schema.
I just got a book from Apress (Spring Recipes), and I started to learn the Spring framework and now I have a problem. I followed the steps in the book to add the Spring .jar-s to the build path. Everything seems to work fine, but the code I have just doesn't work.
My question is that: do you know about a good tutorial for integrating Spring with Eclipse? I googled for a while and I only found old tutorials (from 2007-2009) which just doesn't work with Eclipse 3.6.
use STS - Spring Tool Suite. It is built-upon Eclipse IDE. http://www.springsource.com/developer/sts
STS helps hugely (you can get it from the Eclipse Marketplace for free). The features of it I particularly like? Here's a few:
As a user of XML-based configuration I love having the bean graph visualized – it's great for reports – but the content assist when filling out bean properties is invaluable, both for names and for values (i.e., it makes writing that much XML not suck too much). I imagine that if you're heavily using autowiring or Java configuration it's less useful.
Refactoring support is also good (these days; it used to have bad bugs so you want to be patched up to date) and I've found that the pointcut search to be the only way to write a complex aspect without lots of round-trip testing.
But not all of STS is perfect. In particular, some of the content assist modes don't (seem to) help (me) that much, and it really only works well if you have your properties defined using public setters. Still, it helps a lot…
Apart from using STS as suggested, you can use spring and eclipse without any integration. There isn't that much an IDE integration can offer anyway (apart from autocompletion in the xml, and linking the xml to classes (inclding aop))
IDEs like Netbeans allow generation of entity classes through a persistence context. If you had access to underlying generation method (not sure if it is an external tool or part of the IDE), could you generate database entity classes dynamically at runtime? The idea being that you could hook into the entity classes using reflection.
I know you can go the other way and generate the database from the entity class, however due to permissions issues in my work environment that would be a no go. However, if you reverse the process and pull the classes from the database it may be feasible in my environment. The idea being that the database would serve as a single point of configuration/control.
It's theoretically possible but what would be the point? Java is statically typed so you would only be able to use the generated classes by reflection and you would have no way of giving them behaviour, so removing the whole point of object-relational mapping. Loading the data into Maps or just using SQL record sets would be more convenient.
If you have an existing schema you can write classes that act in the way your application needs and declaratively map them onto the schema. That way the code is the simplest expression of your application logic and is persistence-agnostic.
You can find on JBoss website a tool to do the reverse engineering from database to java objects.
The source code is available, you should dig in!
https://www.jboss.org/tools/download/stable.html
Assuming you're using Hibernate, you might be able to use Hibernate Tools to generate the database schema. Although primarily designed for Eclipse and Ant, its theoretically possible to link it in and invoke it like any other JAR.