There's no documentation for this item.

Source Code

# File active_record/vendor/mysql.rb, line 219
def change_user(user="", passwd="", db="")
  if @pre_411
    data = user+"\0"+scramble(passwd, @scramble_buff, @protocol_version==9)+"\0"+db
  else
    data = user+"\0"+scramble41(passwd, @scramble_buff)+db
  end
  pkt = command COM_CHANGE_USER, data
  handle_auth_fallback(pkt, passwd)
  @user = user
  @passwd = passwd
  @db = db
end