Dynamic Prepend and removal of "beginning" prepends

[Abdullah Kauchali]

<insert id="create" parameterClass="DirectoryTypeBean">
INSERT INTO SEC_DirectoryType (
  
   <dynamic prepend="">        
       <isNotEmpty prepend="," property="directoryType_Code">
           DirectoryType_Code
       </isNotEmpty>
       <isNotEmpty prepend="," property="directoryType_ConnectionFactory">
           DirectoryType_ConnectionFactory
       </isNotEmpty>
       <isNotEmpty prepend="," property="directoryType_JavaApiValues">
           DirectoryType_JavaApiValues
       </isNotEmpty>
       <isNotEmpty prepend="," property="directoryType_DotNetApiValues">
           DirectoryType_DotNetApiValues
       </isNotEmpty>

       .....

</dynamic>


I get incorrect SQL syntax when the first value is empty - iow:  there 
is a comma before the first column.

INSERT INTO SEC_DirectoryType (    ,   DirectoryType_ConnectionFactory ....

What do I do to get rid of the first comma?

TIA,

Kind regards

Abdullah