MONGOC_COLLECTION_UPDATE_ONE - Online Linux Manual PageSection : 3
Updated : Feb 04, 2021
Source : 1.17.4
Note : libmongoc
NAMEmongoc_collection_update_one − mongoc_collection_update_one()
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 updating. • update: A bson_t containing the update to perform. If updating with a pipeline, a bson_t array. • reply: Optional. An uninitialized bson_t populated with the update result, or NULL. • 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 collection, 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 documents. • bypassDocumentValidation: Set to true to skip server−side schema validation 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. • arrayFilters: An array of filters specifying to which array elements an update should apply.
DESCRIPTIONThis function updates at most one document in collection that matches selector. 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 subdocument or a "writeConcernErrors" array. The reply must be freed with bson_destroy().
SEE ALSOMongoDB update command documentation for more information on the update options. mongoc_collection_update_many mongoc_collection_replace_one
ERRORSErrors are propagated via the error parameter.
RETURNSReturns true if successful. Returns false and sets error if there are invalid arguments or a server or network error. A write concern timeout or write concern error is considered a failure.
EXAMPLEexample−update.c #include "mongoc/mongoc.h"
int
main (int argc, char **argv)
{
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);
return EXIT_SUCCESS;
}
AUTHORMongoDB, Inc
COPYRIGHT2017-present, MongoDB, Inc 0
Johanes Gumabo
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