[Zope] Z SQL question..

[Francisco Sam Castillo]

 Hello,

 I have huge problem here, mainly because of my lack of knowledge and
 understanding of Z SQL methods, I really need some help, and I am hopeing
 some one would be willing to give me some light on the following issue:

 I have succeded in creating a dtml form and sql method base on the
marvelous
 how-to recently posted on the subject, but I have different needs, I have
 created a Mysql database that serves to generate users accounts, and
 collects many info from them, the problem here is that I made the database
 with two indexes one with the auto-increment feature (no problem here) and
a
 second one the email field that I have instuct mysql should be unique too,
 and thus when a user gets created if the email address exists, mysql won't
 allow insertion of new data base on the previous rule which is exactly what
 I want it to do, my problem is that I need to test this condition before so
 that if the email exists then the user gets a message telling her/him that
 either she/he most choose another email address, to avoid the error screen,
 or edit his current record which would need a some sort of validation as
 being the rightfull owner of the afore mention account.

 I know this might be to much to as of you all, but I am really stuck I have
 try many approaches unseccesfully and thats why I ask of you to help me if
 you will...

 Thanks a lot in advanced...

 Sam