mongoc_collection_find_with_opts - Man Page

mongoc_collection_find_with_opts()

Synopsis

mongoc_cursor_t *
mongoc_collection_find_with_opts (mongoc_collection_t *collection,
                                  const bson_t *filter,
                                  const bson_t *opts,
                                  const mongoc_read_prefs_t *read_prefs)
   BSON_GNUC_WARN_UNUSED_RESULT;

Parameters

Description

Query on collection, passing arbitrary query options to the server in opts.

To target a specific server, include an integer "serverId" field in opts with an id obtained first by calling mongoc_client_select_server, then mongoc_server_description_id on its return value.

Read preferences, read concern, and collation can be overridden by various sources. In a transaction, read concern and write concern are prohibited in opts and the read preference must be primary or NULL. The highest-priority sources for these options are listed first in the following table. No write concern is applied.

Read PreferencesRead ConcernCollation
read_prefsoptsopts
TransactionTransaction
collection

See the example for transactions and for the "distinct" command with opts.

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.

Returns

A newly allocated mongoc_cursor_t that must be freed with mongoc_cursor_destroy().

Examples

Print First Ten Documents in a Collection

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

static void
print_ten_documents (mongoc_collection_t *collection)
{
   bson_t *filter;
   bson_t *opts;
   mongoc_cursor_t *cursor;
   bson_error_t error;
   const bson_t *doc;
   char *str;

   /* filter by "foo": 1, order by "bar" descending */
   filter = BCON_NEW ("foo", BCON_INT32 (1));
   opts = BCON_NEW (
      "limit", BCON_INT64 (10), "sort", "{", "bar", BCON_INT32 (-1), "}");

   cursor = mongoc_collection_find_with_opts (collection, filter, opts, NULL);

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

   if (mongoc_cursor_error (cursor, &error)) {
      fprintf (stderr, "An error occurred: %s\n", error.message);
   }

   mongoc_cursor_destroy (cursor);
   bson_destroy (filter);
   bson_destroy (opts);
}

More examples of modifying the query with opts:

bson_t *filter;
bson_t *opts;
mongoc_read_prefs_t *read_prefs;

filter = BCON_NEW ("foo", BCON_INT32 (1));

/* Include "field_name_one" and "field_name_two" in "projection", omit
 * others. "_id" must be specifically removed or it is included by default.
 */
opts = BCON_NEW ("projection", "{",
                    "field_name_one", BCON_BOOL (true),
                    "field_name_two", BCON_BOOL (true),
                    "_id", BCON_BOOL (false),
                 "}",
                 "tailable", BCON_BOOL (true),
                 "awaitData", BCON_BOOL (true),
                 "sort", "{", "bar", BCON_INT32 (-1), "}",
                 "collation", "{",
                    "locale", BCON_UTF8("en_US"),
                    "caseFirst", BCON_UTF8 ("lower"),
                 "}");

read_prefs = mongoc_read_prefs_new (MONGOC_READ_SECONDARY);

cursor =
   mongoc_collection_find_with_opts (collection, filter, opts, read_prefs);

The following options are supported.

OptionBSON typeOptionBSON type
projectiondocumentmaxdocument
sortdocumentmaxTimeMSnon-negative int64
skipnon-negative int64maxAwaitTimeMSnon-negative int64
limitnon-negative int64mindocument
batchSizenon-negative int64noCursorTimeoutbool
exhaustbooloplogReplaybool
hintstring or documentreadConcerndocument
allowPartialResultsboolreturnKeybool
awaitDataboolsessionId(none)
collationdocumentshowRecordIdbool
commentstringsingleBatchbool
allowDiskUsebool

All options are documented in the reference page for the "find" command in the MongoDB server manual, except for "maxAwaitTimeMS" and "sessionId".

"maxAwaitTimeMS" is the maximum amount of time for the server to wait on new documents to satisfy a query, if "tailable" and "awaitData" are both true. If no new documents are found, the tailable cursor receives an empty batch. The "maxAwaitTimeMS" option is ignored for MongoDB older than 3.4.

To add a "sessionId", 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 collection. Then use mongoc_client_session_append to add the session to opts. See the example code for mongoc_client_session_t.

To add a "readConcern", construct a mongoc_read_concern_t with mongoc_read_concern_new and configure it with mongoc_read_concern_set_level. Then use mongoc_read_concern_append to add the read concern to opts.

For some options like "collation", the driver returns an error if the server version is too old to support the feature. Any fields in opts that are not listed here are passed to the server unmodified.

allowDiskUse is only supported in MongoDB 4.4+.

Deprecated Options

The snapshot boolean option is removed in MongoDB 4.0. The maxScan option, a non-negative int64, is deprecated in MongoDB 4.0 and will be removed in a future MongoDB version. The oplogReplay boolean option is deprecated in MongoDB 4.4. All of these options are supported by the C Driver with older MongoDB versions.

See Also

The "find" command in the MongoDB Manual. All options listed there are supported by the C Driver. For MongoDB servers before 3.2, or for exhaust queries, the driver transparently converts the query to a legacy OP_QUERY message.

The Explain Command

With MongoDB before 3.2, a query with option $explain: true returns information about the query plan, instead of the query results. Beginning in MongoDB 3.2, there is a separate "explain" command. The driver will not convert "$explain" queries to "explain" commands, you must call the "explain" command explicitly:

/* MongoDB 3.2+, "explain" command syntax */
command = BCON_NEW ("explain", "{",
                    "find", BCON_UTF8 ("collection_name"),
                    "filter", "{", "foo", BCON_INT32 (1), "}",
                    "}");

mongoc_collection_command_simple (collection, command, NULL, &reply, &error);

See Also

The "explain" command in the MongoDB Manual.

Author

MongoDB, Inc

Info

Apr 09, 2021 1.17.5 libmongoc