Does Migrating from one database to another database requires comprehensive change in the Entity Beans? I have oracle 11g express edition and I want to move to MS Sql?
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No.Your entity class can remain the same. However, you may have to change the primary key generation strategy. You may also have to change values of some attributes of the @Column annotation.
Your tables may slightly change due to the fact that different databases have their own ways of storing data. You can regenerate the tables by editing your persistence.xml
<properties>
<property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
</properties>
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