Provided by: libmongoc-doc_1.3.1-1_all 
NAME
mongoc_find_and_modify_opts_t - find_and_modify abstraction
SYNOPSIS
mongoc_find_and_modify_opts_t is a builder interface to construct a find_and_modify command.
It was created to be able to accommodate new arguments to the MongoDB find_and_modify command.
NOTE
New in mongoc 1.3.0
NOTE
As of MongoDB 3.2, the mongoc_write_concern_t specified on the mongoc_collection_t will be used,
if any.
EXAMPLE
void fam_flags(mongoc_collection_t *collection)
{
mongoc_find_and_modify_opts_t *opts;
bson_t reply;
bson_error_t error;
bson_t query = BSON_INITIALIZER;
bson_t *update;
bool success;
/* Find Zlatan Ibrahimovic, the striker */
BSON_APPEND_UTF8 (&query, "firstname", "Zlatan");
BSON_APPEND_UTF8 (&query, "lastname", "Ibrahimovic");
BSON_APPEND_UTF8 (&query, "profession", "Football player");
BSON_APPEND_INT32 (&query, "age", 34);
BSON_APPEND_INT32 (&query, "goals", (16+35+23+57+16+14+28+84)+(1+6+62));
/* Add his football position */
update = BCON_NEW ("$set", "{",
"position", BCON_UTF8 ("striker"),
"}");
opts = mongoc_find_and_modify_opts_new ();
mongoc_find_and_modify_opts_set_update (opts, update);
/* Create the document if it didn't exist, and return the updated document */
mongoc_find_and_modify_opts_set_flags (opts, MONGOC_FIND_AND_MODIFY_UPSERT|MONGOC_FIND_AND_MODIFY_RETURN_NEW);
success = mongoc_collection_find_and_modify_with_opts (collection, &query, opts, &reply, &error);
if (success) {
char *str;
str = bson_as_json (&reply, NULL);
printf ("%s\n", str);
bson_free (str);
} else {
fprintf(stderr, "Got error: \"%s\" on line %d\n", error.message, __LINE__);
}
bson_destroy (&reply);
bson_destroy (update);
bson_destroy (&query);
mongoc_find_and_modify_opts_destroy (opts);
}
void fam_bypass(mongoc_collection_t *collection)
{
mongoc_find_and_modify_opts_t *opts;
bson_t reply;
bson_t *update;
bson_error_t error;
bson_t query = BSON_INITIALIZER;
bool success;
/* Find Zlatan Ibrahimovic, the striker */
BSON_APPEND_UTF8 (&query, "firstname", "Zlatan");
BSON_APPEND_UTF8 (&query, "lastname", "Ibrahimovic");
BSON_APPEND_UTF8 (&query, "profession", "Football player");
/* Bump his age */
update = BCON_NEW ("$inc", "{",
"age", BCON_INT32 (1),
"}");
opts = mongoc_find_and_modify_opts_new ();
mongoc_find_and_modify_opts_set_update (opts, update);
/* He can still play, even though he is pretty old. */
mongoc_find_and_modify_opts_set_bypass_document_validation (opts, true);
success = mongoc_collection_find_and_modify_with_opts (collection, &query, opts, &reply, &error);
if (success) {
char *str;
str = bson_as_json (&reply, NULL);
printf ("%s\n", str);
bson_free (str);
} else {
fprintf(stderr, "Got error: \"%s\" on line %d\n", error.message, __LINE__);
}
bson_destroy (&reply);
bson_destroy (update);
bson_destroy (&query);
mongoc_find_and_modify_opts_destroy (opts);
}
void fam_update(mongoc_collection_t *collection)
{
mongoc_find_and_modify_opts_t *opts;
bson_t *update;
bson_t reply;
bson_error_t error;
bson_t query = BSON_INITIALIZER;
bool success;
/* Find Zlatan Ibrahimovic */
BSON_APPEND_UTF8 (&query, "firstname", "Zlatan");
BSON_APPEND_UTF8 (&query, "lastname", "Ibrahimovic");
/* Make him a book author */
update = BCON_NEW ("$set", "{",
"author", BCON_BOOL (true),
"}");
opts = mongoc_find_and_modify_opts_new ();
/* Note that the document returned is the _previous_ version of the document
* To fetch the modified new version, use
* mongoc_find_and_modify_opts_set_flags (opts, MONGOC_FIND_AND_MODIFY_RETURN_NEW);
*/
mongoc_find_and_modify_opts_set_update (opts, update);
success = mongoc_collection_find_and_modify_with_opts (collection, &query, opts, &reply, &error);
if (success) {
char *str;
str = bson_as_json (&reply, NULL);
printf ("%s\n", str);
bson_free (str);
} else {
fprintf(stderr, "Got error: \"%s\" on line %d\n", error.message, __LINE__);
}
bson_destroy (&reply);
bson_destroy (update);
bson_destroy (&query);
mongoc_find_and_modify_opts_destroy (opts);
}
void fam_fields(mongoc_collection_t *collection)
{
mongoc_find_and_modify_opts_t *opts;
bson_t fields = BSON_INITIALIZER;
bson_t *update;
bson_t reply;
bson_error_t error;
bson_t query = BSON_INITIALIZER;
bool success;
/* Find Zlatan Ibrahimovic */
BSON_APPEND_UTF8 (&query, "lastname", "Ibrahimovic");
BSON_APPEND_UTF8 (&query, "firstname", "Zlatan");
/* Return his goal tally */
BSON_APPEND_INT32 (&fields, "goals", 1);
/* Bump his goal tally */
update = BCON_NEW ("$inc", "{",
"goals", BCON_INT32 (1),
"}");
opts = mongoc_find_and_modify_opts_new ();
mongoc_find_and_modify_opts_set_update (opts, update);
mongoc_find_and_modify_opts_set_fields (opts, &fields);
/* Return the new tally */
mongoc_find_and_modify_opts_set_flags (opts, MONGOC_FIND_AND_MODIFY_RETURN_NEW);
success = mongoc_collection_find_and_modify_with_opts (collection, &query, opts, &reply, &error);
if (success) {
char *str;
str = bson_as_json (&reply, NULL);
printf ("%s\n", str);
bson_free (str);
} else {
fprintf(stderr, "Got error: \"%s\" on line %d\n", error.message, __LINE__);
}
bson_destroy (&reply);
bson_destroy (update);
bson_destroy (&fields);
bson_destroy (&query);
mongoc_find_and_modify_opts_destroy (opts);
}
void fam_sort(mongoc_collection_t *collection)
{
mongoc_find_and_modify_opts_t *opts;
bson_t *update;
bson_t sort = BSON_INITIALIZER;
bson_t reply;
bson_error_t error;
bson_t query = BSON_INITIALIZER;
bool success;
/* Find all users with the lastname Ibrahimovic */
BSON_APPEND_UTF8 (&query, "lastname", "Ibrahimovic");
/* Sort by age (descending) */
BSON_APPEND_INT32 (&sort, "age", ‐1);
/* Bump his goal tally */
update = BCON_NEW ("$set", "{",
"oldest", BCON_BOOL (true),
"}");
opts = mongoc_find_and_modify_opts_new ();
mongoc_find_and_modify_opts_set_update (opts, update);
mongoc_find_and_modify_opts_set_sort (opts, &sort);
success = mongoc_collection_find_and_modify_with_opts (collection, &query, opts, &reply, &error);
if (success) {
char *str;
str = bson_as_json (&reply, NULL);
printf ("%s\n", str);
bson_free (str);
} else {
fprintf(stderr, "Got error: \"%s\" on line %d\n", error.message, __LINE__);
}
bson_destroy (&reply);
bson_destroy (update);
bson_destroy (&sort);
bson_destroy (&query);
mongoc_find_and_modify_opts_destroy (opts);
}
#include <bcon.h>
#include <mongoc.h>
#include "flags.c"
#include "bypass.c"
#include "update.c"
#include "fields.c"
#include "sort.c"
int main(void)
{
mongoc_collection_t *collection;
mongoc_database_t *database;
mongoc_client_t *client;
bson_error_t error;
bson_t *options;
client = mongoc_client_new ("mongodb://localhost:27017/admin");
database = mongoc_client_get_database (client, "databaseName");
options = BCON_NEW ( "validator", "{", "age", "{", "$lte", BCON_INT32 (34), "}", "}", "validationAction", BCON_UTF8 ("error"), "validationLevel", BCON_UTF8 ("moderate"));
collection = mongoc_database_create_collection (database, "collectionName", options, &error);
if (!collection) {
fprintf(stderr, "Got error: \"%s\" on line %d\n", error.message, __LINE__);
return 1;
}
fam_flags (collection);
fam_bypass (collection);
fam_update (collection);
fam_fields (collection);
fam_sort (collection);
mongoc_collection_drop (collection, NULL);
bson_destroy (options);
mongoc_database_destroy (database);
mongoc_collection_destroy (collection);
mongoc_client_destroy (client);
return 0;
}
Outputs:
{
"lastErrorObject": {
"updatedExisting": false,
"n": 1,
"upserted": {
"$oid": "56562a99d13e6d86239c7b00"
}
},
"value": {
"_id": {
"$oid": "56562a99d13e6d86239c7b00"
},
"age": 34,
"firstname": "Zlatan",
"goals": 342,
"lastname": "Ibrahimovic",
"profession": "Football player",
"position": "striker"
},
"ok": 1
}
{
"lastErrorObject": {
"updatedExisting": true,
"n": 1
},
"value": {
"_id": {
"$oid": "56562a99d13e6d86239c7b00"
},
"age": 34,
"firstname": "Zlatan",
"goals": 342,
"lastname": "Ibrahimovic",
"profession": "Football player",
"position": "striker"
},
"ok": 1
}
{
"lastErrorObject": {
"updatedExisting": true,
"n": 1
},
"value": {
"_id": {
"$oid": "56562a99d13e6d86239c7b00"
},
"age": 35,
"firstname": "Zlatan",
"goals": 342,
"lastname": "Ibrahimovic",
"profession": "Football player",
"position": "striker"
},
"ok": 1
}
{
"lastErrorObject": {
"updatedExisting": true,
"n": 1
},
"value": {
"_id": {
"$oid": "56562a99d13e6d86239c7b00"
},
"goals": 343
},
"ok": 1
}
{
"lastErrorObject": {
"updatedExisting": true,
"n": 1
},
"value": {
"_id": {
"$oid": "56562a99d13e6d86239c7b00"
},
"age": 35,
"firstname": "Zlatan",
"goals": 343,
"lastname": "Ibrahimovic",
"profession": "Football player",
"position": "striker",
"author": true
},
"ok": 1
}
COLOPHON
This page is part of MongoDB C Driver. Please report any bugs at
https://jira.mongodb.org/browse/CDRIVER.
MongoDB C Driver 2016‐01‐18 MONGOC_FIND_AND_MODIFY_OPTS_T(3)