Provided by: libmongoc-doc_1.21.0-1build1_all 
NAME
mongoc_collection_count_with_opts - mongoc_collection_count_with_opts()
DEPRECATED
This function is deprecated and should not be used in new code. Use mongoc_collection_count_documents or
mongoc_collection_estimated_document_count instead.
mongoc_collection_count_documents has similar performance to calling mongoc_collection_count with a
non-NULL query, and is guaranteed to retrieve an accurate collection count. See migrating from deprecated
count functions for details.
mongoc_collection_estimated_document_count has the same performance as calling mongoc_collection_count
with a NULL query, but is not guaranteed to retrieve an accurate collection count.
SYNOPSIS
int64_t
mongoc_collection_count_with_opts (mongoc_collection_t *collection,
mongoc_query_flags_t flags,
const bson_t *query,
int64_t skip,
int64_t limit,
const bson_t *opts,
const mongoc_read_prefs_t *read_prefs,
bson_error_t *error)
BSON_GNUC_DEPRECATED_FOR (mongoc_collection_count_documents or
mongoc_collection_estimated_document_count);
PARAMETERS
• collection: A mongoc_collection_t.
• flags: A mongoc_query_flags_t.
• query: A bson_t containing the query.
• skip: A int64_t, zero to ignore.
• limit: A int64_t, zero to ignore.
• opts: A bson_t, NULL to ignore.
• read_prefs: An optional mongoc_read_prefs_t, otherwise uses the collection's read preference.
• error: An optional location for a bson_error_t or NULL.
opts may be NULL or a BSON document with additional command options:
• readConcern: Construct a mongoc_read_concern_t and use mongoc_read_concern_append to add the read
concern to opts. See the example code for mongoc_client_read_command_with_opts. Read concern requires
MongoDB 3.2 or later, otherwise an error is returned.
• sessionId: First, 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, and use mongoc_client_session_append to add the
session to opts. See the example code for mongoc_client_session_t.
• collation: Configure textual comparisons. See Setting Collation Order, and the MongoDB Manual entry on
Collation. Collation requires MongoDB 3.2 or later, otherwise an error is returned.
• serverId: To target a specific server, include an int32 "serverId" field. Obtain the id by calling
mongoc_client_select_server, then mongoc_server_description_id on its return value.
DESCRIPTION
This function shall execute a count query on the underlying 'collection'. The bson 'query' is not
validated, simply passed along as appropriate to the server. As such, compatibility and errors should be
validated in the appropriate server documentation.
The mongoc_read_concern_t specified on the mongoc_collection_t will be used, if any. If read_prefs is
NULL, the collection's read preferences are used.
In addition to the standard functionality available from mongoc_collection_count, this function allows
the user to add arbitrary extra keys to the count. This pass through enables features such as hinting
for counts.
For more information, see the query reference at the MongoDB website.
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.
ERRORS
Errors are propagated via the error parameter.
RETURNS
-1 on failure, otherwise the number of documents counted.
EXAMPLES
Basic Counting
#include <bson/bson.h>
#include <mongoc/mongoc.h>
#include <stdio.h>
static void
print_query_count (mongoc_collection_t *collection, bson_t *query)
{
bson_error_t error;
int64_t count;
bson_t opts;
bson_init (&opts);
BSON_APPEND_UTF8 (&opts, "hint", "_id_");
count = mongoc_collection_count_with_opts (
collection, MONGOC_QUERY_NONE, query, 0, 0, &opts, NULL, &error);
bson_destroy (&opts);
if (count < 0) {
fprintf (stderr, "Count failed: %s\n", error.message);
} else {
printf ("%" PRId64 " documents counted.\n", count);
}
}
Counting with Collation
#include <bson/bson.h>
#include <mongoc/mongoc.h>
#include <stdio.h>
static void
print_query_count (mongoc_collection_t *collection, bson_t *query)
{
bson_t *selector;
bson_t *opts;
bson_error_t error;
int64_t count;
selector = BCON_NEW ("_id", "{", "$gt", BCON_UTF8 ("one"), "}");
/* "One" normally sorts before "one"; make "one" come first */
opts = BCON_NEW ("collation",
"{",
"locale",
BCON_UTF8 ("en_US"),
"caseFirst",
BCON_UTF8 ("lower"),
"}");
count = mongoc_collection_count_with_opts (
collection, MONGOC_QUERY_NONE, query, 0, 0, opts, NULL, &error);
bson_destroy (selector);
bson_destroy (opts);
if (count < 0) {
fprintf (stderr, "Count failed: %s\n", error.message);
} else {
printf ("%" PRId64 " documents counted.\n", count);
}
}
AUTHOR
MongoDB, Inc
COPYRIGHT
2017-present, MongoDB, Inc
1.21.0 Feb 09, 2022 MONGOC_COLLECTION_COUNT_WITH_OPTS(3)