# mongoc_database_get_collection_names_with_opts()

## Synopsis

    char **
    mongoc_database_get_collection_names_with_opts (mongoc_database_t *database,
                                                    const bson_t *opts,
                                                    bson_error_t *error)
       BSON_GNUC_WARN_UNUSED_RESULT;

Fetches a `NULL` terminated array of `NULL-byte` terminated `char*` strings containing the names of all of the collections in `database`.

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.

## Parameters

- `database`: A mongoc_database_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 `database`, 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 listCollections command.

## Errors

Errors are propagated via the `error` parameter.

## Returns

A `NULL` terminated array of `NULL` terminated `char*` strings that should be freed with `bson_strfreev()`. Upon failure, `NULL` is returned and `error` is set.

## Examples

    {
       bson_t opts = BSON_INITIALIZER;
       mongoc_read_concern_t *rc;
       bson_error_t error;
       char **strv;
       unsigned i;

       rc = mongoc_read_concern_new ();
       mongoc_read_concern_set_level (rc, MONGOC_READ_CONCERN_LEVEL_MAJORITY);
       mongoc_read_concern_append (rc, &opts);
       if ((strv = mongoc_database_get_collection_names_with_opts (
              database, &opts, &error))) {

          for (i = 0; strv[i]; i++)
             printf ("%s\n", strv[i]);

          bson_strfreev (strv);
       } else {
          fprintf (stderr, "Command failed: %s\n", error.message);
       }

       mongoc_read_concern_destroy (rc);
       bson_destroy (&opts);
    }