select * from webmail_user_prefs where user_id = :user_id
insert into webmail_user_prefs
(user_id, signature, js_enabled, style, vcard, nav_bar)
values
(:user_id, :signature, :js_enabled, :style, :vcard, :nav_bar)
update webmail_user_prefs
set signature = :signature,
js_enabled = :js_enabled,
style = :style,
vcard = :vcard,
nav_bar = :nav_bar
where user_id = :user_id