NAME

       mongoc_client_t - mongoc_client_t

       A single-threaded MongoDB connection. See connection-pooling.

SYNOPSIS

          typedef struct _mongoc_client_t mongoc_client_t;

          typedef mongoc_stream_t *(*mongoc_stream_initiator_t) (
             const mongoc_uri_t *uri,
             const mongoc_host_list_t *host,
             void *user_data,
             bson_error_t *error);

       mongoc_client_t  is  an opaque type that provides access to a MongoDB server, replica set,
       or sharded  cluster.  It  maintains  management  of  underlying  sockets  and  routing  to
       individual nodes based on mongoc_read_prefs_t or mongoc_write_concern_t.

STREAMS

       The  underlying transport for a given client can be customized, wrapped or replaced by any
       implementation  that  fulfills  mongoc_stream_t.  A  custom  transport  can  be  set  with
       mongoc_client_set_stream_initiator().

THREAD SAFETY

       mongoc_client_t is NOT thread-safe and should only be used from one thread at a time. When
       used in  multi-threaded  scenarios,  it  is  recommended  that  you  use  the  thread-safe
       mongoc_client_pool_t to retrieve a mongoc_client_t for your thread.

EXAMPLE

       example-client.c.INDENT 0.0

          /* gcc example-client.c -o example-client $(pkg-config --cflags --libs
           * libmongoc-1.0) */

          /* ./example-client [CONNECTION_STRING [COLLECTION_NAME]] */

          #include <mongoc.h>
          #include <stdio.h>
          #include <stdlib.h>

          int
          main (int argc, char *argv[])
          {
             mongoc_client_t *client;
             mongoc_collection_t *collection;
             mongoc_cursor_t *cursor;
             bson_error_t error;
             const bson_t *doc;
             const char *uristr = "mongodb://127.0.0.1/?appname=client-example";
             const char *collection_name = "test";
             bson_t query;
             char *str;

             mongoc_init ();

             if (argc > 1) {
                uristr = argv[1];
             }

             if (argc > 2) {
                collection_name = argv[2];
             }

             client = mongoc_client_new (uristr);

             if (!client) {
                fprintf (stderr, "Failed to parse URI.\n");
                return EXIT_FAILURE;
             }

             mongoc_client_set_error_api (client, 2);

             bson_init (&query);

          #if 0
             bson_append_utf8 (&query, "hello", -1, "world", -1);
          #endif

             collection = mongoc_client_get_collection (client, "test", collection_name);
             cursor = mongoc_collection_find_with_opts (
                collection,
                &query,
                NULL,  /* additional options */
                NULL); /* read prefs, NULL for default */

             while (mongoc_cursor_next (cursor, &doc)) {
                str = bson_as_canonical_extended_json (doc, NULL);
                fprintf (stdout, "%s\n", str);
                bson_free (str);
             }

             if (mongoc_cursor_error (cursor, &error)) {
                fprintf (stderr, "Cursor Failure: %s\n", error.message);
                return EXIT_FAILURE;
             }

             bson_destroy (&query);
             mongoc_cursor_destroy (cursor);
             mongoc_collection_destroy (collection);
             mongoc_client_destroy (client);

             mongoc_cleanup ();

             return EXIT_SUCCESS;
          }

AUTHOR

       MongoDB, Inc

COPYRIGHT

       2018, MongoDB, Inc