DROP TRIGGER IF EXISTS `placasptc`.`update_bds`//
CREATE TRIGGER `placasptc`.`update_bds` BEFORE UPDATE ON `placasptc`.`bds`
 FOR EACH ROW begin
insert into historico
set hist_action ='update',
bkp_ID = old.ID,
bkp_empresa = old.empresa,
bkp_prefixo = old.prefixo,
bkp_placa = old.placa,
hist_modificado = now(),
hist_usuario = Current_user();
end