データベースコマンドの実行

bson_t reply;
bson_error_t error;
bson_t *command = BCON_NEW ("hello", BCON_INT32 (1));
bool retval = mongoc_client_command_simple (client, "admin", command, NULL, &reply, &error);
if (!retval) {
    fprintf (stderr, "Failed to run command: %s\n", error.message);
} else {
    char *str = bson_as_canonical_extended_json (&reply, NULL);
    printf ("%s\n", str);
    bson_free (str);
}
bson_destroy (command);
bson_destroy (&reply);

bson_t reply;
bson_error_t error;
bson_t *command = BCON_NEW(
    "grantRolesToUser", BCON_UTF8("user011"),
    "roles", "[", BCON_UTF8("readWrite"), "]"
);
mongoc_write_concern_t *write_concern = mongoc_write_concern_new();
mongoc_write_concern_set_w (write_concern, MONGOC_WRITE_CONCERN_W_MAJORITY);
bson_t *opts = bson_new();
mongoc_write_concern_append(write_concern, opts);
bool retval = mongoc_client_command_with_opts(client, "admin", command, NULL, opts, &reply, &error);
if (!retval) {
    fprintf(stderr, "Failed to run command: %s\n", error.message);
} else {
    char *str = bson_as_canonical_extended_json(&reply, NULL);
    printf("Command Result: %s\n", str);
    bson_free(str);
}
bson_destroy(command);
bson_destroy(opts);
bson_destroy(&reply);
mongoc_write_concern_destroy (write_concern);

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bson_t reply;
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bson_error_t error;
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bson_t *cmd = BCON_NEW ("cloneCollectionAsCapped",
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        BCON_UTF8 ("my_collection"),
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        "toCollection",
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        BCON_UTF8 ("my_capped_collection"),
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        "size",
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        BCON_INT64 (1024 * 1024));
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/* Includes write concern "majority" in command options */
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mongoc_write_concern_t *write_concern = mongoc_write_concern_new ();
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mongoc_write_concern_set_w (write_concern, MONGOC_WRITE_CONCERN_W_MAJORITY);
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bson_t *opts = bson_new ();
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mongoc_write_concern_append (write_concern, opts);
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if (mongoc_client_write_command_with_opts (client, "test", cmd, opts, &reply, &error)) {
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    char *str = bson_as_canonical_extended_json (&reply, NULL);
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    printf ("cloneCollectionAsCapped: %s\n", str);
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    bson_free (str);
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} else {
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    fprintf (stderr, "cloneCollectionAsCapped: %s\n", error.message);
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}
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bson_free (cmd);
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bson_free (opts);
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bson_destroy (&reply);
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/* Defines distinct values of "x" in "my_collection" where "y" sorts after "one" */
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cmd = BCON_NEW ("distinct",
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        BCON_UTF8 ("my_collection"),
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        "key",
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        BCON_UTF8 ("x"),
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        "query",
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        "{",
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        "y",
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        "{",
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        "$gt",
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        BCON_UTF8 ("one"),
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        "}",
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        "}");
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mongoc_read_prefs_t *read_prefs = mongoc_read_prefs_new (MONGOC_READ_SECONDARY);
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/* Specifies "One" sorts after "one" to override default behavior */
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opts = BCON_NEW ("collation", "{", "locale", BCON_UTF8 ("en_US"), "caseFirst", BCON_UTF8 ("lower"), "}");
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/* Adds a read concern to "opts" */
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mongoc_read_concern_t *read_concern = mongoc_read_concern_new ();
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mongoc_read_concern_set_level (read_concern, MONGOC_READ_CONCERN_LEVEL_MAJORITY);
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mongoc_read_concern_append (read_concern, opts);
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if (mongoc_client_read_command_with_opts (client, "test", cmd, read_prefs, opts, &reply, &error)) {
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    char* str = bson_as_canonical_extended_json (&reply, NULL);
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    printf ("distinct: %s\n", str);
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    bson_free (str);
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} else {
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    fprintf (stderr, "distinct: %s\n", error.message);
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}
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bson_destroy (cmd);
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bson_destroy (opts);
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bson_destroy (&reply);
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mongoc_read_prefs_destroy (read_prefs);
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mongoc_read_concern_destroy (read_concern);
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mongoc_write_concern_destroy (write_concern);