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Transfer entities between entitymanagers [message #666327]

Tue, 19 April 2011 18:01

Eclipse User

Hi,

in a currently running project we want to change your database product.

How could we transfer all data from database A to database B?

What problems could we meet?

Re: Transfer entities between entitymanagers [message #666664 is a reply to message #666327]

Thu, 21 April 2011 09:41

Eclipse User

If it is a small database, you could just read everything from one persistence unit mapped to the one db, and write to the other.

One issue would be Id generation, if you are generating the Ids, you must ensure the Id generators are updated to the last used Id.

If your database is very big, then you may wish to use more direct means, such as import/export tools, or direct migration scripts.

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