need help with component object

mk · **Joined:** Sat Jan 29, 2005 8:49 pm **Posts:** 20

Hibernate version:
3.0.5

Mapping documents:

Code:

<component name="webAddress" class="WebAddress">
<property name="url" column="WEB" insert="true" access="property" type="string"/>
</component>

I use a component for the web address so I can use a validate method on the url. Though when the database field WEB is null the containing object webAddress is not created but set to null.

The same effect happens when I use the not-null attribute.

Code:

<component name="webAddress" class="WebAddress">
<property name="url" column="WEB" insert="true" access="property" type="string" not-null="true"/>
</component>

The only workaround I have found is to use a second dummy property that uses a formula.

Code:

<component name="webAddress" class="WebAddress">
<property name="url" column="WEB" insert="true" access="property" type="string"/>
<property name="dummy" formula="''"/>
</component>

What else can I do?[/code]

mk · **Joined:** Sat Jan 29, 2005 8:49 pm **Posts:** 20

I just found a paragraph in the manual about that

http://www.hibernate.org/hib_docs/reference/en/html/components.html

Quote:

Like all value types, components do not support shared references. The null value semantics of a component are ad hoc. When reloading the containing object, Hibernate will assume that if all component columns are null, then the entire component is null. This should be okay for most purposes.

For now I have manipulated the setter function to something like ...

Code:

public void setWebAddress(WebAddress webAddress) {
  this.webAddress = (webAddress == null) ? new WebAddress() : webAddress;
}

... but I hope there is something more simple (like a not-null of the component)

Code:

<component name="webAddress" class="WebAddress" not-null="true">
  <property name="url" column="WEB" insert="true" access="property" type="string"/>
</component>

ge0ffrey · **Joined:** Thu Oct 13, 2005 4:19 am **Posts:** 98

I 'll also use your hack as it isn't okay in my situation to leave it null :(