Provided by: libmongoc-doc_1.9.2+dfsg-1build1_all bug

NAME

       mongoc_client_write_command_with_opts - mongoc_client_write_command_with_opts()

SYNOPSIS

          bool
          mongoc_client_write_command_with_opts (mongoc_client_t *client,
                                                 const char *db_name,
                                                 const bson_t *command,
                                                 const bson_t *opts,
                                                 bson_t *reply,
                                                 bson_error_t *error);

       Execute  a  command on the server, applying logic that is specific to commands that write, and taking the
       MongoDB server version into account. To send a raw command to the server without any of this  logic,  use
       mongoc_client_command_simple.

       Use this function for commands that write such as "drop" or "createRole" (but not for "insert", "update",
       or "delete", see Basic Write Operations). Write concern is applied from opts, or else  from  client.  The
       write  concern  is  omitted  for  MongoDB before 3.4. Collation is applied from opts (see example for the
       "distinct" command with opts). No read concern or read preferences are applied.

       reply is always initialized, and must be freed with bson_destroy().

PARAMETERS

client: A mongoc_client_t.

       • db_name: The name of the database to run the command on.

       • command: A bson_t containing the command specification.

       • opts: A bson_t containing additional options.

       • reply: A location for the resulting document.

       • 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:    Construct    a   mongoc_client_session_t   with   mongoc_client_start_session   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.

       Consult the MongoDB Manual entry on Database Commands for each command's arguments.

ERRORS

       Errors are propagated via the error parameter.

RETURNS

       Returns  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.

BASIC WRITE OPERATIONS

       Do not use this function to call the  basic  write  commands  "insert",  "update",  and  "delete".  Those
       commands  require special logic not implemented in mongoc_client_write_command_with_opts. For basic write
       operations use CRUD functions such as mongoc_collection_insert_one and the others described in  the  CRUD
       tutorial, or use the Bulk API.

EXAMPLE

       example-command-with-opts.c.INDENT 0.0

          /*

          Demonstrates how to prepare options for mongoc_client_read_command_with_opts and
          mongoc_client_write_command_with_opts. First it calls "cloneCollectionAsCapped"
          command with "writeConcern" option, then "distinct" command with "collation" and
          "readConcern" options,

          Start a MongoDB 3.4 replica set with --enableMajorityReadConcern and insert two
          documents:

          $ mongo
          MongoDB Enterprise replset:PRIMARY> db.my_collection.insert({x: 1, y: "One"})
          WriteResult({ "nInserted" : 1 })
          MongoDB Enterprise replset:PRIMARY> db.my_collection.insert({x: 2, y: "Two"})
          WriteResult({ "nInserted" : 1 })

          Build and run the example:

          gcc example-command-with-opts.c -o example-command-with-opts $(pkg-config
          --cflags --libs libmongoc-1.0)
          ./example-command-with-opts [CONNECTION_STRING]
          cloneCollectionAsCapped: { "ok" : 1 }
          distinct: { "values" : [ 1, 2 ], "ok" : 1 }

          */

          #include <mongoc.h>
          #include <stdio.h>
          #include <stdlib.h>

          int
          main (int argc, char *argv[])
          {
             mongoc_client_t *client;
             const char *uristr = "mongodb://127.0.0.1/?appname=client-example";
             bson_t *cmd;
             bson_t *opts;
             mongoc_write_concern_t *write_concern;
             mongoc_read_prefs_t *read_prefs;
             mongoc_read_concern_t *read_concern;
             bson_t reply;
             bson_error_t error;
             char *json;

             mongoc_init ();

             if (argc > 1) {
                uristr = argv[1];
             }

             client = mongoc_client_new (uristr);

             if (!client) {
                fprintf (stderr, "Failed to parse URI.\n");
                return EXIT_FAILURE;
             }

             mongoc_client_set_error_api (client, 2);

             cmd = BCON_NEW ("cloneCollectionAsCapped",
                             BCON_UTF8 ("my_collection"),
                             "toCollection",
                             BCON_UTF8 ("my_capped_collection"),
                             "size",
                             BCON_INT64 (1024 * 1024));

             /* include write concern "majority" in command options */
             write_concern = mongoc_write_concern_new ();
             mongoc_write_concern_set_wmajority (write_concern, 10000 /* wtimeoutMS */);
             opts = bson_new ();
             mongoc_write_concern_append (write_concern, opts);

             if (mongoc_client_write_command_with_opts (
                    client, "test", cmd, opts, &reply, &error)) {
                json = bson_as_canonical_extended_json (&reply, NULL);
                printf ("cloneCollectionAsCapped: %s\n", json);
                bson_free (json);
             } else {
                fprintf (stderr, "cloneCollectionAsCapped: %s\n", error.message);
             }

             bson_free (cmd);
             bson_free (opts);

             /* distinct values of "x" in "my_collection" where "y" sorts after "one" */
             cmd = BCON_NEW ("distinct",
                             BCON_UTF8 ("my_collection"),
                             "key",
                             BCON_UTF8 ("x"),
                             "query",
                             "{",
                             "y",
                             "{",
                             "$gt",
                             BCON_UTF8 ("one"),
                             "}",
                             "}");

             read_prefs = mongoc_read_prefs_new (MONGOC_READ_SECONDARY);

             /* "One" normally sorts before "one"; make "One" sort after "one" */
             opts = BCON_NEW ("collation",
                              "{",
                              "locale",
                              BCON_UTF8 ("en_US"),
                              "caseFirst",
                              BCON_UTF8 ("lower"),
                              "}");

             /* add a read concern to "opts" */
             read_concern = mongoc_read_concern_new ();
             mongoc_read_concern_set_level (read_concern,
                                            MONGOC_READ_CONCERN_LEVEL_MAJORITY);

             mongoc_read_concern_append (read_concern, opts);

             if (mongoc_client_read_command_with_opts (
                    client, "test", cmd, read_prefs, opts, &reply, &error)) {
                json = bson_as_canonical_extended_json (&reply, NULL);
                printf ("distinct: %s\n", json);
                bson_free (json);
             } else {
                fprintf (stderr, "distinct: %s\n", error.message);
             }

             bson_destroy (cmd);
             bson_destroy (opts);
             bson_destroy (&reply);
             mongoc_read_prefs_destroy (read_prefs);
             mongoc_read_concern_destroy (read_concern);
             mongoc_write_concern_destroy (write_concern);
             mongoc_client_destroy (client);

             mongoc_cleanup ();

             return EXIT_SUCCESS;
          }

AUTHOR

       MongoDB, Inc

COPYRIGHT

       2018, MongoDB, Inc