Hibernate generate POJOs with Equals

Question

We are using hibernate in a new project where we use the hibernate.reveng.xml to create our *.hbm.xml files and POJOs after that. We want to have equals methods in each of our POJOs. I found that you can use <meta attribute="use-in-equals">true</meta> in your hbm files to mark which properties to use in the equals. But this would mean editing alot of files, and then re-editing the files again in the future if/when we modify tables or columns in our DB.

So I was wondering if there is a way to place which properties to use in the equals method for each pojo(table) in the hibernate.reveng.xml file?

Pascal Thivent · Accepted Answer · 2010-03-26 16:00:32Z

6

This is an undocumented feature (and the online DTD is out of date) but you can add <meta> in the <table> and <colum> elements. In other words, you should be able to do this:

<table name="PROPERTY" catalog="DATA" schema="PUBLIC">
  <meta attribute="extends">BasicDataObject</meta>
  <meta attribute="scope-class">public abstract</meta>
  <column name="ID">
    <meta attribute="use-in-equals">true</meta>
    <meta attribute="use-in-tostring">true</meta>
  </column>
</table>

The DTD in hibernate-tools.jar should be up-to-date (and looks like this one) and declare:

<!ELEMENT column (meta*) >

There is a discussion about this in the Seam in Action forums.

edited Mar 26, 2010 at 16:00

answered Mar 26, 2010 at 15:51

Pascal Thivent

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dr jerry · Accepted Answer · 2010-03-26 15:18:09Z

2

eclipse has equal and hash code generator. We use that for generation of those methods.

answered Mar 26, 2010 at 15:18

dr jerry

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2 Comments

Jacob Schoen Over a year ago

@dr jerry When you db schema changes, do you regenerate your pojos and then manually go back through them and readd the equals add hash code?

dr jerry Over a year ago

No after db changes, i do not regenerate. At some point we left the generation thing and do a manual update of our pojo's. Our configuration is too much tweaked to benefit from code generation.

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