MONGOC_CLIENT_GET_DATABASE_NAMES_WITH_OPTS(3) libmongoc MONGOC_CLIENT_GET_DATABASE_NAMES_WITH_OPTS(3) 

char **
mongoc_client_get_database_names_with_opts (mongoc_client_t *client,
                                            const bson_t *opts,
                                            bson_error_t *error)
   BSON_GNUC_WARN_UNUSED_RESULT;


This function queries the MongoDB server for a list of known databases.

This function is considered a retryable read operation. Upon a transient error (a network error, errors due to replica set failover, etc.) the operation is safely retried once. If retryreads is false in the URI (see mongoc_uri_t) the retry behavior does not apply.

  • client: A mongoc_client_t.
  • opts: A bson_t containing additional options.
  • error: An optional location for a bson_error_t or NULL.

opts may be NULL or a BSON document with additional command options:

  • sessionId: First, construct a mongoc_client_session_t with mongoc_client_start_session(). You can begin a transaction with mongoc_client_session_start_transaction(), optionally with a mongoc_transaction_opt_t that overrides the options inherited from client, and use mongoc_client_session_append() to add the session to opts. See the example code for mongoc_client_session_t.
  • serverId: To target a specific server, include an int32 "serverId" field. Obtain the id by calling mongoc_client_select_server(), then mongoc_server_description_id() on its return value.

For a list of all options, see the MongoDB Manual entry on the listDatabases command.

Errors are propagated via the error parameter.

A NULL terminated vector of NULL-byte terminated strings. The result should be freed with bson_strfreev().

NULL is returned upon failure and error is set.

{
   bson_error_t error;
   char **strv;
   unsigned i;
   if ((strv = mongoc_client_get_database_names_with_opts (client, NULL, &error))) {
      for (i = 0; strv[i]; i++)
         printf ("%s\n", strv[i]);
      bson_strfreev (strv);
   } else {
      fprintf (stderr, "Command failed: %s\n", error.message);
   }
}


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March 31, 2024 1.26.0