Hibernate version: 3.1.3

Hi,

How can I get the length of, say, a String property programmatically from the SessionFactory or Configuration? I'd like to retrieve, on the fly, the length of a column specified in the mapping document. Not quite sure how.

Thanks.

Do you mean the current string length or the underlying limitation on the column with in the database?

If you mean the underlying database metadata you could do this the same way we used to do these things before Hibernate by using the java.sql.DataBaseMetaData class.

(http://java.sun.com/j2se/1.5.0/docs/api ... aData.html)

For example...


Using that connection() call directly might not be allowed depending on the transaction, database, and other factors in Hibernate that I'm not aware of...

Nope, I mean the one I specified in the mapping file. I'm actually using annotations, but the idea's the same. I have:

CREATE TABLE blah ( some_col VARCHAR2(32) );

So because it's 32, I put this in the mapping:

@Basic
@Column( name="some_col", length=32 ) <---- Need this!
private String someCol;

So I need to grab it from the property itself (mapping document).

Isn't that information just forwarded to the database for table creation. In other words, any column width restrictions are imposed by the underlying database and not hibernate (from what I understand). Once the table is created, the metadata can be retreived from the DataBaseMetaData instance.

However...

I was looking a little deeper and I wonder if this might work:

From Configurations try:


A lot of assumptions here. I havn't tried it myself.