mongoc_create_indexes - Creating Indexes

       MongoDB, Inc

       2017-present, MongoDB, Inc

1.21.0                                            Feb 09, 2022                          MONGOC_CREATE_INDEXES(3)

       example-create-indexes.c

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

          /* ./example-create-indexes [CONNECTION_STRING [COLLECTION_NAME]] */

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

          int
          main (int argc, char *argv[])
          {
             mongoc_client_t *client;
             const char *uri_string =
                "mongodb://127.0.0.1/?appname=create-indexes-example";
             mongoc_uri_t *uri;
             mongoc_database_t *db;
             const char *collection_name = "test";
             bson_t keys;
             char *index_name;
             bson_t *create_indexes;
             bson_t reply;
             char *reply_str;
             bson_error_t error;
             bool r;

             mongoc_init ();

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

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

             uri = mongoc_uri_new_with_error (uri_string, &error);
             if (!uri) {
                fprintf (stderr,
                         "failed to parse URI: %s\n"
                         "error message:       %s\n",
                         uri_string,
                         error.message);
                return EXIT_FAILURE;
             }

             client = mongoc_client_new_from_uri (uri);
             if (!client) {
                return EXIT_FAILURE;
             }

             mongoc_client_set_error_api (client, 2);
             db = mongoc_client_get_database (client, "test");

             /* ascending index on field "x" */
             bson_init (&keys);
             BSON_APPEND_INT32 (&keys, "x", 1);
             index_name = mongoc_collection_keys_to_index_string (&keys);
             create_indexes = BCON_NEW ("createIndexes",
                                        BCON_UTF8 (collection_name),
                                        "indexes",
                                        "[",
                                        "{",
                                        "key",
                                        BCON_DOCUMENT (&keys),
                                        "name",
                                        BCON_UTF8 (index_name),
                                        "}",
                                        "]");

             r = mongoc_database_write_command_with_opts (
                db, create_indexes, NULL /* opts */, &reply, &error);

             reply_str = bson_as_json (&reply, NULL);
             printf ("%s\n", reply_str);

             if (!r) {
                fprintf (stderr, "Error in createIndexes: %s\n", error.message);
             }

             bson_free (index_name);
             bson_free (reply_str);
             bson_destroy (&reply);
             bson_destroy (create_indexes);
             mongoc_database_destroy (db);
             mongoc_uri_destroy (uri);
             mongoc_client_destroy (client);

             mongoc_cleanup ();

             return r ? EXIT_SUCCESS : EXIT_FAILURE;
          }

       mongoc_create_indexes - Creating Indexes

       To create indexes on a MongoDB collection, execute the createIndexes command with a command function like
       mongoc_database_write_command_with_opts  or  mongoc_collection_write_command_with_opts.  See  theMongoDBManualentryforthecreateIndexescommand for details.

       WARNING:
          The commitQuorum option to the createIndexes command is only supported in MongoDB 4.4+ servers, but it
          is not validated in the command functions. Do not pass commitQuorum if connected  to  server  versions
          less than 4.4. Using the commitQuorum option on server versions less than 4.4 may have adverse effects
          on index builds.