"returning" in postgresql request

Hi,

    I try to deploy an Application with Oracle Database to a solution with postgresql.
    the Oracle system exists and we use a request which return an int in a variable nb by "returning nb_lock into nb"

    UPDATE xdb_ancestors_lock SET nb_lock=nb_lock+1 WHERE doc_id=? AND ele_id=? returning nb_lock INTO nb;

        I'd like to know if there is equivalent solution under postgresql or if i'm obliged to do a select before my
update.

        Best regards,

        Nico

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