@Thomas - not sure you can just put in the iFrame tags in the source.

@Yusuf - It took me some time to find it but I think it was a blog entry from Tripcony or Hodge but one of them was using a computed field.  I think this falls in line with what you are trying to do with the html that the rdbms is spewing.  Here's what I did as an example:

1. create sample xpage
2. put computed field on xpage
3. in properties make sure that content type is HTML
4. in properties in the values tab click the advanced radio button for the Bind option
5. paste your iframe stuff in there.  or really any html code. 

Here's my source(the real URL's were obsfuscated to protect the innocent):

<xp:text escape="false"
                                    id="computedField1">
                                    <xp:this.value><![CDATA[<iframe title="YouTube video player" width="640" height="390" src="http://www.youtube.com/M" frameborder="0" allowfullscreen></iframe>]]></xp:this.value>
                                </xp:text>

 

I hope this helps.