CODEWITHSUNDEEP
javahibernatejpa
Ashish K Agarwal
Ashish K Agarwal

Reputation: 1172

Sequence Generator in persistence.xml

In JPA, generally we specify the sequence generator in the entity bean. Can we specify this in the persistence.xml? if yes, pls share the steps neeeded

Upvotes: 4

Views: 8771

Answers (1)

Allan
Allan

Reputation: 2939

You have to specify it in the orm.xml. In the persistence.xml use this element:

 <mapping-file>META-INF/orm.xml</mapping-file>

Then in your orm.xml (orm.xml will override annotations if you specify different attributes in it)

  <sequence-generator name="MY_SEQ"
    allocation-size="1"
    sequence-name="MY_SEQ"
    initial-value="1" />


 <entity class="my.entities.Entity" name="Entity">
        <table name="Entity"/>

        <attributes>

            <id name="id">
                    <generated-value strategy="SEQUENCE" generator="MY_SEQ"/>

            </id>

        </attributes>
    </entity>

In this case, the id property will be set from the orm.xml. Any other annotations you are using for other properties will still work.

Upvotes: 9

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