java - JPA using multiple database schemas

Question

I'm having a bit of trouble with one particular issue using JPA/Spring:

How can I dynamically assign a schema to an entity?

We have TABLE1 that belongs to schema AD and TABLE2 that is under BD.

@Entity
@Table(name = "TABLE1", schema="S1D")
...

@Entity
@Table(name = "TABLE2", schema="S2D")
...

The schemas may not be hardcoded in an annotation attribute as it depends on the environment (Dev/Acc/Prd). (In acceptance the schemas are S1A and S2A)

How can I achieve this? Is it possible to specify some kind of placeholders like this:

@Entity
@Table(name = "TABLE1", schema="${schema1}")
...

@Entity
@Table(name = "TABLE2", schema="${schema2}")
...

so that schemas are replaced based on a property file residing in the environment?

Cheers

Answer 1

I had the same problem I solved that with a persistence.xml in which I refer to the needed orm.xml files within I declared the db shema

<persistence
xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0" >
<persistence-unit name="schemaOne">
    . . .
    <mapping-file>ormOne.xml</mapping-file>
    . . .
</persistence-unit>

<persistence-unit name="schemaTwo">
    . . .
    <mapping-file>ormTwo.xml</mapping-file>
    . . .
 </persistence-unit>
</persistence>

now you can create a EntityManagerFactory for your special schema

EntityManagerFactory emf = Persistence.createEntityManagerFactory("schemaOne");