MONGOC_COLLECTION_UPDATE_ONE(3) libmongoc MONGOC_COLLECTION_UPDATE_ONE(3) SYNOPSIS bool mongoc_collection_update_one (mongoc_collection_t *collection, const bson_t *selector, const bson_t *update, const bson_t *opts, bson_t *reply, bson_error_t *error); PARAMETERS * collection: A mongoc_collection_t. * selector: A bson_t containing the query to match the document for updat- ing. * update: A bson_t containing the update to perform. If updating with a pipeline, a bson_t array. * reply: A maybe-NULL pointer to overwritable storage for a bson_t to con- tain the results. * error: An optional location for a bson_error_t or NULL. opts may be NULL or a BSON document with additional command options: * writeConcern: Construct a mongoc_write_concern_t and use mongoc_write_concern_append() to add the write concern to opts. See the example code for mongoc_client_write_command_with_opts(). * 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 col- lection, and use mongoc_client_session_append() to add the session to opts. See the example code for mongoc_client_session_t. * validate: Construct a bitwise-or of all desired bson_validate_flags_t. Set to false to skip client-side validation of the provided BSON docu- ments. * comment: A bson_value_t specifying the comment to attach to this command. The comment will appear in log messages, profiler output, and currentOp output. Requires MongoDB 4.4 or later. * bypassDocumentValidation: Set to true to skip server-side schema valida- tion of the provided BSON documents. * 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. * hint: A document or string that specifies the index to use to support the query predicate. * upsert: When true, creates a new document if no document matches the query. * let: A BSON document consisting of any number of parameter names, each followed by definitions of constants in the MQL Aggregate Expression lan- guage. * arrayFilters: An array of filters specifying to which array elements an update should apply. * sort: Specify a sort order when matching documents. DESCRIPTION This function updates at most one document in collection that matches se- lector. To update multiple documents see mongoc_collection_update_many(). If you pass a non-NULL reply, it is filled out with fields matchedCount, modifiedCount, and optionally upsertedId if applicable. If there is a server error then reply contains either a "writeErrors" array with one sub- document or a "writeConcernErrors" array. The reply must be freed with - bson_destroy(). ERRORS Errors are propagated via the error parameter. RETURNS Returns true if successful. Returns false and sets error if there are in- valid arguments or a server or network error. A write concern timeout or write concern error is considered a failure. EXAMPLE example-update.c #include <mongoc/mongoc.h> int main (void) { mongoc_init (); bson_t *to_insert = BCON_NEW ("_id", BCON_INT32 (1)); bson_t *selector = BCON_NEW ("_id", "{", "$gt", BCON_INT32 (0), "}"); bson_t *update = BCON_NEW ("$set", "{", "x", BCON_INT32 (1), "}"); const bson_t *next_doc; char *to_str; bson_error_t error = {0}; mongoc_cursor_t *cursor; mongoc_client_t *client; mongoc_collection_t *coll; const char *uri_string = "mongodb://localhost:27017/?appname=example-update"; mongoc_uri_t *uri = mongoc_uri_new_with_error (uri_string, &error); if (!uri) { fprintf (stderr, "failed to parse URI: %s\n" "error message: %s\n", uri_string, error.message); return EXIT_FAILURE; } client = mongoc_client_new_from_uri (uri); if (!client) { return EXIT_FAILURE; } coll = mongoc_client_get_collection (client, "db", "example_coll"); mongoc_client_set_error_api (client, 2); /* insert a document */ if (!mongoc_collection_insert_one (coll, to_insert, NULL, NULL, &error)) { fprintf (stderr, "insert failed: %s\n", error.message); return EXIT_FAILURE; } if (!mongoc_collection_update_one (coll, selector, update, NULL, NULL, &error)) { fprintf (stderr, "update failed: %s\n", error.message); return EXIT_FAILURE; } to_str = bson_as_relaxed_extended_json (to_insert, NULL); printf ("inserted: %s\n", to_str); bson_free (to_str); cursor = mongoc_collection_find_with_opts (coll, selector, NULL, NULL); BSON_ASSERT (mongoc_cursor_next (cursor, &next_doc)); printf ("after update, collection has the following document:\n"); to_str = bson_as_relaxed_extended_json (next_doc, NULL); printf ("%s\n", to_str); bson_free (to_str); BSON_ASSERT (mongoc_collection_drop (coll, NULL)); bson_destroy (to_insert); bson_destroy (update); bson_destroy (selector); mongoc_collection_destroy (coll); mongoc_uri_destroy (uri); mongoc_client_destroy (client); mongoc_cleanup (); return EXIT_SUCCESS; } SEE ALSO: MongoDB update command documentation for more information on the update options. mongoc_collection_update_many() mongoc_collection_replace_one() AUTHOR MongoDB, Inc COPYRIGHT 2009-present, MongoDB, Inc. 1.30.8 Aug 27, 2026 MONGOC_COLLECTION_UPDATE_ONE(3)
SYNOPSIS | PARAMETERS | DESCRIPTION | ERRORS | RETURNS | EXAMPLE | AUTHOR | COPYRIGHT
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