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unidirectional one-to-one can have null id?

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moraleslos

Post subject: unidirectional one-to-one can have null id?

Posted: Mon Jun 12, 2006 12:22 pm

Beginner

Joined: Fri Mar 12, 2004 1:02 pm
Posts: 23

Hi,

I have a one-to-one relationship using a unidirectional many-to-one w/FK constraint mapping and I was wondering if I can allow null values for the FK. For example, I have a one-to-one relationship between Customer and Account (where Customer knows Account but not vice-versa). Sometimes the business rule allows a Customer to exist without an Account (for accounts pending) so I need the flexibility of having null values for accountIds in the customer table. How can I allow this null value on the FK. The way I have it set up now, I get a FK constraint... below is my mapping:

Code:

<hibernate-mapping>

    <class 
        name="com.test.domain.Customer" 
        table="CUSTOMER">

        <id name="customerId" type="long">
            <column name="CUSTOMER_ID" not-null="true"/>
            <generator class="native"/>
        </id>

        .....

        <many-to-one 
            name="account"
            class="com.test.domain.Account"
            column="ACCOUNT_ID"
            cascade="all"
            unique="true"/>   
    </class>
</hibernate-mapping>

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moraleslos

Post subject:

Posted: Mon Jun 12, 2006 2:08 pm