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);

1bson_t reply;2bson_error_t error;3
4bson_t *cmd = BCON_NEW("cloneCollectionAsCapped",5        BCON_UTF8("my_collection"),6        "toCollection",7        BCON_UTF8("my_capped_collection"),8        "size",9        BCON_INT64(1024 * 1024));10
11/* Includes write concern "majority" in command options */12mongoc_write_concern_t *write_concern = mongoc_write_concern_new();13mongoc_write_concern_set_w(write_concern, MONGOC_WRITE_CONCERN_W_MAJORITY);14bson_t *opts = bson_new();15mongoc_write_concern_append(write_concern, opts);16
17if (mongoc_client_write_command_with_opts(client, "test", cmd, opts, &reply, &error)) {18    char *str = bson_as_canonical_extended_json(&reply, NULL);19    printf("cloneCollectionAsCapped: %s\n", str);20    bson_free(str);21} else {22    fprintf(stderr, "cloneCollectionAsCapped: %s\n", error.message);23}24
25bson_free(cmd);26bson_free(opts);27bson_destroy(&reply);28
29/* Defines distinct values of "x" in "my_collection" where "y" sorts after "one" */30cmd = BCON_NEW("distinct",31        BCON_UTF8("my_collection"),32        "key",33        BCON_UTF8("x"),34        "query",35        "{",36        "y",37        "{",38        "$gt",39        BCON_UTF8("one"),40        "}",41        "}");42
43mongoc_read_prefs_t *read_prefs = mongoc_read_prefs_new(MONGOC_READ_SECONDARY);44
45/* Specifies "One" sorts after "one" to override default behavior */46opts = BCON_NEW("collation", "{", "locale", BCON_UTF8("en_US"), "caseFirst", BCON_UTF8("lower"), "}");47
48/* Adds a read concern to "opts" */49mongoc_read_concern_t *read_concern = mongoc_read_concern_new();50mongoc_read_concern_set_level(read_concern, MONGOC_READ_CONCERN_LEVEL_MAJORITY);51mongoc_read_concern_append(read_concern, opts);52
53if (mongoc_client_read_command_with_opts(client, "test", cmd, read_prefs, opts, &reply, &error)) {54    char* str = bson_as_canonical_extended_json(&reply, NULL);55    printf("distinct: %s\n", str);56    bson_free(str);57} else {58    fprintf(stderr, "distinct: %s\n", error.message);59}60
61bson_destroy(cmd);62bson_destroy(opts);63bson_destroy(&reply);64mongoc_read_prefs_destroy(read_prefs);65mongoc_read_concern_destroy(read_concern);66mongoc_write_concern_destroy(write_concern);