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Implement a custom enum mapping with an AttributeConverter
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JPA and Hibernate provide 2 standard options to map an Enum to a database column. You can either use its String representation or its ordinal value.
But what do you do, if you need to map values from a legacy database that don’t match these standard mappings?
Or if you don’t want to accept the drawbacks of the standard mapping?
The String representation is verbose, and renaming an enum value requires you also to update your database.
The ordinal of an enum value is its position in the enum declaration. This value changes and requires you to update your database when you remove an existing value or don’t add new values to the end of the enum declaration.
In all these situations, you need to define a custom mapping. But no worries, that’s pretty easy since JPA 2.1 introduced AttributeConverter.
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#JPA #HIbernate #AttributeConverter #Tutorial
But what do you do, if you need to map values from a legacy database that don’t match these standard mappings?
Or if you don’t want to accept the drawbacks of the standard mapping?
The String representation is verbose, and renaming an enum value requires you also to update your database.
The ordinal of an enum value is its position in the enum declaration. This value changes and requires you to update your database when you remove an existing value or don’t add new values to the end of the enum declaration.
In all these situations, you need to define a custom mapping. But no worries, that’s pretty easy since JPA 2.1 introduced AttributeConverter.
If you like this video, please give it a thumbs up and share it with your friends and co-workers.
Like my channel? Subscribe!
Join the free Member Library:
Want to connect with me?
#JPA #HIbernate #AttributeConverter #Tutorial
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