Hello Hibernate Users,
Iam having the following issue with schema export tool . This is in regard to a one to one mapping. The hibernate version is 3.0

I have two Pojos's (user and user preferences),
The relation ship to be defined between the pojo's is
user <--- bi directional one to one----> user preferences.

The mapping xml file for users is

<hibernate-mapping>
<class
name="com.cpnm.common.dbm.model.User"
table="user"
lazy="false"
>
<id
name="userId"
type="long"
column="user_id"
>

<generator class="native" />
</id>

<version name="version" column="version" type="long" />

<property
name="userName"
type="java.lang.String"
column="user_name"
unique="true"
not-null="true"
/>
<one-to-one
name="preference"
class="com.cisco.cpnm.common.dbm.model.UserPreferences"
property-ref="user"
cascade="all"
>

<column name="user_id"/>
</one-to-one>
</class>
</hibernate-mapping>

The mapping for userPreferences is

<hibernate-mapping>

<class
name="com.cpnm.common.dbm.model.UserPreferences"
table="user_preferences"
lazy="false"
>

<id
name="prefId"
type="long"
column="pref_id"
>

<generator class="native" />
</id>

<version name="version" column="version" type="long" />


<property name="userPreference"
type="java.lang.String"
column="preference"
>
</property>

<!-- Associations -->

<!-- one to one association with users -->

<many-to-one
name="user"
class= "com.cisco.cpnm.common.dbm.model.User"
column = "user_id"
not-null="true"
unique="true"
cascade="none"
/>

</class>

</hibernate-mapping>

I get the following error , while creating a schema using schema-export , it complains about the one to one mapping in the xml mapping file for user.
The error is
"The content of element type "one-to-one" must match "(meta*|formula*)"."
I googled on this, did not find much help.
I tried using a <formula> and <meta> sub element as well , it did not help.
Any insight into this problem ??
thank you,
Suchitha.

Well thanks for your help in my topic so I to took the time to run your xml
through my home made DOM inspector. The problem is hibernate-mapping-3.0.dtd does not declare an element <column> under a
<one-to-one> you can only use only use elements <meta> or <formula>
inside <one-to-one> which are optional here is the segment of the dtd that
refers to this.

Thank you so much for figuring out the problem , using the "home made" DOM Inspector. It was of gr8 help for me.
hmmm, The xml element <column> is not supported by one to one mapping as per hibernate 3.0 dtd
This issue held me up , from proceeding further for 1.5 days, thanks once gain for your time and help

I have a class A that have two one to one relations B,C, when i load class A hibernate load both B,C. I tried with lazy="proxy' or true, but not work for me . !!
Can eny body helpme please .. !!

Hi,

I've tried to map user object to address object like this:

<one-to-one name="address" class="Address">
<column name="address" />
</one-to-one>

but the error is: The content of element type "one-to-one" must match "(meta*,formula*).

Are meta and formula attributes required or optional? If I map user to address replacing one-to-one with many-to-one, there is no problems, I get what I want: I have a User pojo with field Address and Address pojo with no references to User and everything works fine, I'm able to fetch all users and their addresses. I don't have to include anything pointing from Address.java to User.java and nothing referring to User in address.hbm.xml. Because I would also like to have a Company.java pojo to refer to Address.java. With many-to-one mapping this I can do, but it feels wrong to use many-to-one when the logic is one-to-one. I've googled a lot but haven't find a good answer for this. Is there a way to use one-to-one mapping this unidirectional way?

Thanks in advance, Kaitsu

It's well explained in the hibernate tutorial 7.2.2! LoL!

A unidirectional one-to-one association on a foreign key is almost identical (to many-to-one). The only difference is the column unique constraint.

<class name="Person">
<id name="id" column="personId">
<generator class="native"/>
</id>
<many-to-one name="address"
column="addressId"
unique="true"
not-null="true"/>
</class>

<class name="Address">
<id name="id" column="addressId">
<generator class="native"/>
</id>
</class>