1MONGOC_CLIENT_WRITE_COMMAND_WITH_OPTlSi(b3mM)oOnNgGoOcC_CLIENT_WRITE_COMMAND_WITH_OPTS(3)
2
6 mongoc_client_write_command_with_opts - mongoc_client_write_com‐
7 mand_with_opts()
8
10 bool
11 mongoc_client_write_command_with_opts (mongoc_client_t *client,
12 const char *db_name,
13 const bson_t *command,
14 const bson_t *opts,
15 bson_t *reply,
16 bson_error_t *error);
17 Execute a command on the server, applying logic that is specific to
19 commands that write, and taking the MongoDB server version into
20 account. To send a raw command to the server without any of this logic,
21 use mongoc_client_command_simple.
22 Use this function for commands that write such as "drop" or "create‐
24 Role" (but not for "insert", "update", or "delete", see Basic Write
25 Operations). Write concern and collation can be overridden by various
26 sources. In a transaction, read concern and write concern are prohib‐
27 ited in opts. The highest-priority sources for these options are listed
28 first in the following table. The write concern is omitted for MongoDB
29 before 3.4.
30 ┌──────────────┬───────────┐
32 │Write Concern │ Collation │
33 ├──────────────┼───────────┤
34 │opts │ opts │
35 ├──────────────┼───────────┤
36 │Transaction │ │
37 ├──────────────┼───────────┤
38 │client │ │
39 └──────────────┴───────────┘
40 See the example for transactions and for the "distinct" command with
42 opts.
43 reply is always initialized, and must be freed with bson_destroy().
45
47 · client: A mongoc_client_t.
48 · db_name: The name of the database to run the command on.
50 · command: A bson_t containing the command specification.
52 · opts: A bson_t containing additional options.
54 · reply: A location for the resulting document.
56 · error: An optional location for a bson_error_t or NULL.
58 opts may be NULL or a BSON document with additional command options:
60 · writeConcern: Construct a mongoc_write_concern_t and use mon‐
62 goc_write_concern_append to add the write concern to opts. See the
63 example code for mongoc_client_write_command_with_opts.
64 · sessionId: First, construct a mongoc_client_session_t with mon‐
66 goc_client_start_session. You can begin a transaction with mon‐
67 goc_client_session_start_transaction, optionally with a mongoc_trans‐
68 action_opt_t that overrides the options inherited from client, and
69 use mongoc_client_session_append to add the session to opts. See the
70 example code for mongoc_client_session_t.
71 · collation: Configure textual comparisons. See Setting Collation
73 Order, and the MongoDB Manual entry on Collation. Collation requires
74 MongoDB 3.2 or later, otherwise an error is returned.
75 · serverId: To target a specific server, include an int32 "serverId"
77 field. Obtain the id by calling mongoc_client_select_server, then
78 mongoc_server_description_id on its return value.
79 Consult the MongoDB Manual entry on Database Commands for each com‐
81 mand's arguments.
82
84 Errors are propagated via the error parameter.
85
87 Returns true if successful. Returns false and sets error if there are
88 invalid arguments or a server or network error.
89 A write concern timeout or write concern error is considered a failure.
91
93 Do not use this function to call the basic write commands "insert",
94 "update", and "delete". Those commands require special logic not imple‐
95 mented in mongoc_client_write_command_with_opts. For basic write opera‐
96 tions use CRUD functions such as mongoc_collection_insert_one and the
97 others described in the CRUD tutorial, or use the Bulk API.
98
100 example-command-with-opts.c.INDENT 0.0
101 /*
103 Demonstrates how to prepare options for mongoc_client_read_command_with_opts and
105 mongoc_client_write_command_with_opts. First it calls "cloneCollectionAsCapped"
106 command with "writeConcern" option, then "distinct" command with "collation" and
107 "readConcern" options,
108 Start a MongoDB 3.4 replica set with --enableMajorityReadConcern and insert two
110 documents:
111 $ mongo
113 MongoDB Enterprise replset:PRIMARY> db.my_collection.insert({x: 1, y: "One"})
114 WriteResult({ "nInserted" : 1 })
115 MongoDB Enterprise replset:PRIMARY> db.my_collection.insert({x: 2, y: "Two"})
116 WriteResult({ "nInserted" : 1 })
117 Build and run the example:
119 gcc example-command-with-opts.c -o example-command-with-opts $(pkg-config
121 --cflags --libs libmongoc-1.0)
122 ./example-command-with-opts [CONNECTION_STRING]
123 cloneCollectionAsCapped: { "ok" : 1 }
124 distinct: { "values" : [ 1, 2 ], "ok" : 1 }
125 */
127 #include <mongoc/mongoc.h>
129 #include <stdio.h>
130 #include <stdlib.h>
131 int
133 main (int argc, char *argv[])
134 {
135 mongoc_client_t *client;
136 const char *uri_string = "mongodb://127.0.0.1/?appname=client-example";
137 mongoc_uri_t *uri;
138 bson_t *cmd;
139 bson_t *opts;
140 mongoc_write_concern_t *write_concern;
141 mongoc_read_prefs_t *read_prefs;
142 mongoc_read_concern_t *read_concern;
143 bson_t reply;
144 bson_error_t error;
145 char *json;
146 mongoc_init ();
148 if (argc > 1) {
150 uri_string = argv[1];
151 }
152 uri = mongoc_uri_new_with_error (uri_string, &error);
154 if (!uri) {
155 fprintf (stderr,
156 "failed to parse URI: %s\n"
157 "error message: %s\n",
158 uri_string,
159 error.message);
160 return EXIT_FAILURE;
161 }
162 client = mongoc_client_new_from_uri (uri);
164 if (!client) {
165 return EXIT_FAILURE;
166 }
167 mongoc_client_set_error_api (client, 2);
169 cmd = BCON_NEW ("cloneCollectionAsCapped",
171 BCON_UTF8 ("my_collection"),
172 "toCollection",
173 BCON_UTF8 ("my_capped_collection"),
174 "size",
175 BCON_INT64 (1024 * 1024));
176 /* include write concern "majority" in command options */
178 write_concern = mongoc_write_concern_new ();
179 mongoc_write_concern_set_wmajority (write_concern, 10000 /* wtimeoutMS */);
180 opts = bson_new ();
181 mongoc_write_concern_append (write_concern, opts);
182 if (mongoc_client_write_command_with_opts (
184 client, "test", cmd, opts, &reply, &error)) {
185 json = bson_as_canonical_extended_json (&reply, NULL);
186 printf ("cloneCollectionAsCapped: %s\n", json);
187 bson_free (json);
188 } else {
189 fprintf (stderr, "cloneCollectionAsCapped: %s\n", error.message);
190 }
191 bson_free (cmd);
193 bson_free (opts);
194 /* distinct values of "x" in "my_collection" where "y" sorts after "one" */
196 cmd = BCON_NEW ("distinct",
197 BCON_UTF8 ("my_collection"),
198 "key",
199 BCON_UTF8 ("x"),
200 "query",
201 "{",
202 "y",
203 "{",
204 "$gt",
205 BCON_UTF8 ("one"),
206 "}",
207 "}");
208 read_prefs = mongoc_read_prefs_new (MONGOC_READ_SECONDARY);
210 /* "One" normally sorts before "one"; make "One" sort after "one" */
212 opts = BCON_NEW ("collation",
213 "{",
214 "locale",
215 BCON_UTF8 ("en_US"),
216 "caseFirst",
217 BCON_UTF8 ("lower"),
218 "}");
219 /* add a read concern to "opts" */
221 read_concern = mongoc_read_concern_new ();
222 mongoc_read_concern_set_level (read_concern,
223 MONGOC_READ_CONCERN_LEVEL_MAJORITY);
224 mongoc_read_concern_append (read_concern, opts);
226 if (mongoc_client_read_command_with_opts (
228 client, "test", cmd, read_prefs, opts, &reply, &error)) {
229 json = bson_as_canonical_extended_json (&reply, NULL);
230 printf ("distinct: %s\n", json);
231 bson_free (json);
232 } else {
233 fprintf (stderr, "distinct: %s\n", error.message);
234 }
235 bson_destroy (cmd);
237 bson_destroy (opts);
238 bson_destroy (&reply);
239 mongoc_read_prefs_destroy (read_prefs);
240 mongoc_read_concern_destroy (read_concern);
241 mongoc_write_concern_destroy (write_concern);
242 mongoc_uri_destroy (uri);
243 mongoc_client_destroy (client);
244 mongoc_cleanup ();
246 return EXIT_SUCCESS;
248 }
249
252 MongoDB, Inc
253
255 2017-present, MongoDB, Inc
2561.16.2 Feb 25M,ON2G0O2C0_CLIENT_WRITE_COMMAND_WITH_OPTS(3)