As its been awhile there has been a new plugin that can replace DB Lookup. You can use CB Query Field to have query validation on any core field now. What this does is validate the value the user supplied against the database. Meaning you can have a text field that checks the database to see if any rows exist already with that value. The error message CB Query Field outputs is entirely up to you as a parameter when configuring the query validation. Since it's validation it will properly fail the registration process if it doesn't validate.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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krileon
