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<page id="executing-command"
type="topic"
xmlns="http://projectmallard.org/1.0/">
<title>Executing Commands</title>
<p>The driver provides helper functions for executing MongoDB commands on client, database and collection structures. These functions return <link xref="mongoc_cursor_t">cursors</link>; the <code>_simple</code> variants return booleans indicating success or failure.</p>
<p>This example executes the <link href="http://docs.mongodb.org/manual/reference/command/collStats/">collStats</link> command against the collection "mycoll" in database "mydb".</p>
<listing>
<title><file>executing.c</file></title>
<synopsis><code mime="text/x-csrc"><![CDATA[#include <bson.h>
#include <bcon.h>
#include <mongoc.h>
#include <stdio.h>
int
main (int argc,
char *argv[])
{
mongoc_client_t *client;
mongoc_collection_t *collection;
bson_error_t error;
bson_t *command;
bson_t reply;
char *str;
mongoc_init ();
client = mongoc_client_new ("mongodb://localhost:27017/");
collection = mongoc_client_get_collection (client, "mydb", "mycoll");
command = BCON_NEW ("collStats", BCON_UTF8 ("mycoll"));
if (mongoc_collection_command_simple (collection, command, NULL, &reply, &error)) {
str = bson_as_json (&reply, NULL);
printf ("%s\n", str);
bson_free (str);
} else {
fprintf (stderr, "Failed to run command: %s\n", error.message);
}
bson_destroy (command);
bson_destroy (&reply);
mongoc_collection_destroy (collection);
mongoc_client_destroy (client);
mongoc_cleanup ();
return 0;
}
]]></code></synopsis>
</listing>
<p>Compile the code and run it:</p>
<screen><output style="prompt">$ gcc -o executing executing.c $(pkg-config --cflags --libs libmongoc-1.0)
$ ./executing
{ "ns" : "mydb.mycoll", "count" : 1, "size" : 48, "avgObjSize" : 48, "numExtents" : 1, "storageSize" : 8192,
"lastExtentSize" : 8192.000000, "paddingFactor" : 1.000000, "userFlags" : 1, "capped" : false, "nindexes" : 1,
"indexDetails" : { }, "totalIndexSize" : 8176, "indexSizes" : { "_id_" : 8176 }, "ok" : 1.000000 }</output></screen>
<p>On Windows:</p>
<screen><output style="prompt">C:\> cl.exe /IC:\mongo-c-driver\include\libbson-1.0 /IC:\mongo-c-driver\include\libmongoc-1.0 executing.c
C:\> executing
{ "ns" : "mydb.mycoll", "count" : 1, "size" : 48, "avgObjSize" : 48, "numExtents" : 1, "storageSize" : 8192,
"lastExtentSize" : 8192.000000, "paddingFactor" : 1.000000, "userFlags" : 1, "capped" : false, "nindexes" : 1,
"indexDetails" : { }, "totalIndexSize" : 8176, "indexSizes" : { "_id_" : 8176 }, "ok" : 1.000000 }</output></screen>
</page>
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