Setting a default property for a column in Hibernate

biot023 · **Posted:** Thu Jun 30, 2005 10:42 am

Hallo -- is there a way to set a default value for a column in the mapping file?
I mean somthing like this:

Code:

but that would work!

Cheers,
doug.

joe.pugh · **Joined:** Thu Jun 30, 2005 10:49 am **Posts:** 2

Hi

I think you need to use the <meta attribute> element to do this, instead of setting your mapping as:

<property name="isMain" type="boolean" not-null="true" default-value="false" />

Try setting it as:

<property name="isMain" type="boolean" not-null="true"><meta attribute="default-value">false</meta></property>

biot023 · **Posted:** Fri Jul 01, 2005 10:02 am

Thanks alot for that, man!
doug.

cool_raj · **Joined:** Thu Jan 29, 2004 5:27 pm **Posts:** 5

Where can I read up on the meta tag? I've never seen it before!

Raj

cool_raj · **Joined:** Thu Jan 29, 2004 5:27 pm **Posts:** 5

Looking at the DTD, it clearly states what the purpose of this tag is.


<!ELEMENT meta (#PCDATA)>
<!ATTLIST meta attribute CDATA #REQUIRED>
<!ATTLIST meta inherit (true|false) "true">

ctran · **Joined:** Wed Jul 06, 2005 8:18 pm **Posts:** 23

I believe that tag is only used for schema generation. To specify default value, just set it in your object (I usually do this in the constructor):

class Foo ... {
String bar = "defaultValue";

}

nathanmoon · **Posted:** Thu Jul 07, 2005 10:02 am

ctran wrote:

I believe that tag is only used for schema generation.

Did you mean POJO generation (hbm2java)? That's the only place I've seen it used.

But I sure would love it if there were a meta attribute like a previous poster suggested for specifying a default value in the database. But that's a topic for the Tools forum. I'm going to search around in JIRA to see if something like that is in the works, or has been rejected in the past.

nathanmoon · **Posted:** Thu Jul 07, 2005 10:19 am

Actually, I forgot that SchemaExport isn't considered part of the Tools extensions, so this is the right forum. I searched JIRA and couldn't find anything related to default values for SchemaExport. Does anyone know why this isn't a feature? It seems logical to be able to generate columns with default values, so I'm not sure why this isn't part of SchemaExport. Is there something I'm missing??