Do you mean it generates code? That's still a "DRY" violation. And if you mean it only looks at the RDBMS table, then it has insufficient info. Describing a field well often requires more info/meta-data than what a typical RDBMS schema has.

Here's a list of typical attributes: db-field-name, type, display-name, form-sequence, list-sequence, relation-type (primary key, foreign key, etc.), reference-table, min-length, max-length, default-value, help-tip, bootstrap-column-width, grouping-filters/codes, search-form-type, and other optional do-dads.