Function prepare_server_struct_for_update

sql/sql_servers.cc:1329–1371

*/

static void
prepare_server_struct_for_update(LEX_SERVER_OPTIONS *server_options,
                                 FOREIGN_SERVER *existing,
                                 FOREIGN_SERVER *altered)
{
  DBUG_ENTER("prepare_server_struct_for_update");

  altered->server_name= existing->server_name;
  altered->server_name_length= existing->server_name_length;
  DBUG_PRINT("info", ("existing name %s altered name %s",
                      existing->server_name, altered->server_name));

  /*
    The logic here is this: is this value set AND is it different
    than the existing value?
  */
#define SET_ALTERED(X)                                                       \
  do {                                                                       \
    altered->X=                                                              \
      (server_options->X.str && strcmp(server_options->X.str, existing->X))  \
      ? strmake_root(&mem, server_options->X.str, server_options->X.length)  \
      : 0;                                                                   \
  } while(0)

  SET_ALTERED(host);
  SET_ALTERED(db);
  SET_ALTERED(username);
  SET_ALTERED(password);
  SET_ALTERED(socket);
  SET_ALTERED(scheme);
  SET_ALTERED(owner);
  merge_engine_options(existing->option_list, server_options->option_list,
                       &altered->option_list, &mem);

  /*
    port is initialised to -1, so if unset, it will be -1
  */
  altered->port= (server_options->port > -1 &&
                 server_options->port != existing->port) ?
    server_options->port : -1;

  DBUG_VOID_RETURN;
}

/*