WARNING:

          Deprecated  since version 1.11.0: 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

1.26.0                                            Mar 31, 2024              MONGOC_COLLECTION_COUNT_WITH_OPTS(3)