* I would like to know how to do so that the duplicate key error is not printed and to avoid displaying my tables information, using a personalized message *

code

CREATE DEFINER='root'@'localhost' 
    PROCEDURE 'insertarclientes'(
         in nombre varchar(20),
         apellido varchar(20), 
         num_cedula varchar(20),
         direccion varchar(20),
         telefono varchar(20),
         email varchar(20)
        )
BEGIN

insert into persona values (idpersona,nombre,apellido,num_cedula,direccion,telefono,email);

END