I want to update my mysql database and alter some tables(add new tables and columns).Is there any way to update the hibernate configuration file and mapping classes and add the entity classes for the newly added table in netbeans IDE without manual coding for swing applications?
There are some tools out there to generate hibernate mappings, like this. For netbeans, I think this link might help you.
Related
I am new to Hibernate and trying to create annotation based Model classes from MYSQL database using reversed engineering(i.e, hibernate-configuration option of jBoss).
However after searching I found this link: http://www.mkyong.com/hibernate/how-to-generate-code-with-hibernate-tools/, but this link does not show how to create annotation based model classes from mysql schema.
I am using Eclipse Kepler and Add the following URL to your Eclipse Kepler 4.3 installation, via:
Help > Install New Software… > Work with:
http://download.jboss.org/jbosstools/updates/stable/kepler/
Then select the individual features that you want to install:
Could anyone please suggest what else needs to be done? Attached are the screen shot from my eclipse workspace for reference.
Please guide me soonest possible
So it's not giving me any output with annotations, all model classes without mappings are generating with *.hbm files. Please, Please help
I want model classes with hibernate mapping on that (i.e, without .hbm files).
After researching I was able to solve this issue. I should be creating a JPA project and through JPA Tools options, I can generate Entities from tables.
As we know, Hibernate allows you to persist a class into a table.
But, can we do the contrary ? Can we directly create a class from an available table ? Can we directly create objects from the lines of an available table ?
Thank you everyone,
You can generate entity classes from database tables at design/development time with the help of Hibernate Tools. Here is a basic example of it. Before creating any object of an entity, its class must exists.
From the documentation:
several wizards are provided with the Hibernate Eclipse tools. You can use a wizard to quickly generate Hibernate configuration (cfg.xml) files, or to reverse engineer an existing database schema into POJO source files and Hibernate mapping files. The reverse engineering wizard supports customizable templates.
Creating objects from rows in a database table is the primary job of an ORM. So of course that is possible too.
I'm relatively new at Hibernate and have therefore the following question:
Is there any way to exclude a specific column/s when I generate an entity from an existing DB ? For this purpose I'm using Hibernate Tools with Eclipse Luna.
You can delete the column from the generated files if you like.
I'm also new at Hibernate, and need to generate lots of entities from a DB. After struggling myself all day long on how to do that, I finally got a decent answer: use Hibernate Tools either as a Maven plugin or with ant.
I found this interesting discussion on how to initially configure Hibernate tools as a Maven plugin: https://developer.jboss.org/message/801478#801478
Then for your specific question (which is also mine) on How to exclude unwanted columns for the entity generation here is the answer:
You need to write a hibernate-reverse-engineering.xml file something like this:
<table name="myTable">
<!--...magic tricks and configurations...-->
<column name="myColumnName" exclude="true"/>
</table>
But that fits just for myTable columns, not for all the columns in your DB/schema (which is what I needed =[ ). I don't see any global column-filter tag or whatsoever to tell Hibernate to ignore that column for all the tables you are mapping to JPA entities.
Here is the documentation on the hibernate-reverse-engineering.xml with examples and all the magic tricks you can do:
http://docs.jboss.org/tools/latest/en/hibernatetools/html/reverseengineering.html
Is it possible to take the backup of mysql database using hibernate ? Share your ideas.
I am using hibernate mapping xml for pojo mapping with table.
AFAIK, Hibernate not providing features for backup or restore.
How ever you should consider to do it from command line, which you can execute through java.
Downloading MySQL dump from command line
Hibernate does not provide database backup functionality and here is why,
Hibernate is an OR mapping tool and primarily aimed as objectifying the database so that the code developers don't have to bother about databases interaction intricacies and never have to work with database directly.
Database backups are taken by DB administrators (and not developers) who very closely work with the databases and are familiar with tools and terminologies. Hence tools like hibernate do not have any role here to play.
Here follows some solutions
You can create hibernate with ant for restore/backup database This Link provide more information about that
Here follows another solution for backup/restore tables programatically using hibernate
I have an existing sql schema file for db. Is it possible to generate and re-generate when needed DAO's entities and all other required helper/client classes to access it? I don't mind what will it be -- hibernate, other jpa or something else.
Asuming you/others are still looking for a solution:
I just got the same problem and got it working in Eclipse (slightly different) as follows:
created JPA Project and downloaded & added user library in the wizard
Also wanted to give a schema-sql-file as input but instead found a way to take an actual db as input. (That was surely much easier for the developers of the tool to process than parsing proprietary sql-script-files)
To do that "rightclick" you jpa project an there "new/other/jpa/entities from tables"
In the following Wizard you have to create a db-connection to the db whose schema you want to get as jpa-annotated POJOs (IMHO It's very intuitive..but you may ask if there is a problem)
After finishing all jpa-classes are generated from the db...saved me from a lot of dummy work :)