Hibernate工具基于mysql db创建基本映射

Question

Are there any tools that can look at a database, and generate the basic mapping files?

It would be great if it could take a database, and create the actual model (java classes) with annotations, but not sure if that exists?

Answer 1

Hibernate 3 has a toolset called Hibernate Tools that provides an Eclipse plugin and an Ant task that both support Reverse Engineering :

Reverse Engineering: The most powerful feature of Hibernate Tools is a database reverse engineering tool that can generate domain model classes and Hibernate mapping files, annotated EJB3 entity beans, HTML documentation or even an entire JBoss Seam application in seconds!

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Ant task: The Hibernate3 tools include a unified Ant task that allows you to run schema generation, mapping generation, or Java code generation as part of your build.

For the Eclipse plugin, have a look at this section of the documentation. For the Ant task, have a look at the section about reverse engineering and optionally how to control it .

Note that other IDEs also provide support for reverse engineering (see Hibernate Reverse Engineering for Netbeans 6.5 and Generating Persistence Mappings from Database Schema for IntelliJ).

Answer 2

I just happened to stumble across this problem and I think I have found a perfect tool for the job.

http://hibernatepojoge.sourceforge.net/

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Features : (in case you are lazy to go through the provided link)

• Java objects representing each table using annotations for use with Hibernate.
• A JUnit test case per table that uses the objects generated to create, populate, save, retrieve and compare results
• DAO per class
• The appropriate enumeration files
• Spring and hibernate configuration
• DAO layers
• A data factory class per schema to return a pre-populated object with random data (for boundary checking, database population, etc)

Also supports:

• Join tables including those with additional fields in link tables
• Polymorphism/inheritance support
• Composite Keys
• One-To-One, many-to-one, many-to-many, etc
• Multiple schema support (4 modes)
• Natural Keys
• Enumerations (including those entries which cannot be mapped cleanly onto the java world)
• A whole bunch of more stuff (see sample.xml)

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I would also like to say that setting this up is quite straight forward; You just have to have a hibernate configuration file and the jar file downloaded from the site. Then it's just a matter executing a jar file, passing the config.xml as a parameter!

Answer 3

If you are using eclipse or ant...

Jboss tools

Answer 4

You might find what you need here, I found it on the fly: MyGeneration .

I know there are others that exist, but I don'T remember by heart. Hope this helps!