status = mysql_stmt_prepare(stmt, "CALL AggiungiContante(?, ?, ?)", strlen("CALL AggiungiContante(?, ?, ?)"));
    test_stmt_error(stmt, status);

    memset(ps_params, 0, sizeof(ps_params));

    ps_params[0].buffer_type = MYSQL_TYPE_LONG;
    ps_params[0].buffer = &id_categoria;
    ps_params[0].buffer_length = sizeof(int);
    ps_params[0].length = &length[0];
    ps_params[0].is_null = 0;

    ps_params[1].buffer_type = MYSQL_TYPE_LONG;
    ps_params[1].buffer = &peso_min_pacco;
    ps_params[1].buffer_length = sizeof(int);
    ps_params[1].length = &length[1];
    ps_params[1].is_null = 0;

    ps_params[2].buffer_type = MYSQL_TYPE_LONG;
    ps_params[2].buffer = &peso_max_pacco;
    ps_params[2].buffer_length = sizeof(int);
    ps_params[2].length = &length[2];
    ps_params[2].is_null = 0;

    ps_params[3].buffer_type = MYSQL_TYPE_LONG;
    ps_params[3].buffer = &dim_min_pacco;
    ps_params[3].buffer_length = sizeof(int);
    ps_params[3].length = &length[3];
    ps_params[3].is_null = 0;

    ps_params[4].buffer_type = MYSQL_TYPE_LONG;
    ps_params[4].buffer = &dim_max_pacco;
    ps_params[4].buffer_length = sizeof(int);
    ps_params[4].length = &length[4];
    ps_params[4].is_null = 0;

    ps_params[5].buffer_type = MYSQL_TYPE_LONG;
    ps_params[5].buffer = &stima_costo_pacco;
    ps_params[5].buffer_length = sizeof(int);
    ps_params[5].length = &length[5];
    ps_params[5].is_null = 0;