/usr/share/doc/libmongoc-doc/html/deleting-document.html

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<div class="hgroup"><h1 class="title"><span class="title">Deleting a Document</span></h1></div>
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<p class="p">This example illustrates the use of <span class="link"><a href="mongoc_collection_remove.html" title="mongoc_collection_remove()">mongoc_collection_remove()</a></span> to delete documents.</p>
<p class="p">The following code inserts a sample document into the database "mydb" and collection "mycoll". Then, it deletes all documents matching <span class="code">{"hello" : "world"}</span>.</p>
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<div class="title title-listing"><h2><span class="title"><span class="file">delete.c</span></span></h2></div>
<div class="region"><div class="contents"><div class="synopsis"><div class="inner"><div class="region"><div class="contents"><div class="code"><pre class="contents syntax brush-clang">#include &lt;bson.h&gt;
#include &lt;mongoc.h&gt;
#include &lt;stdio.h&gt;

int
main (int   argc,
      char *argv[])
{
    mongoc_client_t *client;
    mongoc_collection_t *collection;
    mongoc_cursor_t *cursor;
    bson_error_t error;
    bson_oid_t oid;
    bson_t *doc;

    mongoc_init ();

    client = mongoc_client_new ("mongodb://localhost:27017/");
    collection = mongoc_client_get_collection (client, "test", "test");

    doc = bson_new ();
    bson_oid_init (&amp;oid, NULL);
    BSON_APPEND_OID (doc, "_id", &amp;oid);
    BSON_APPEND_UTF8 (doc, "hello", "world");

    if (!mongoc_collection_insert (collection, MONGOC_INSERT_NONE, doc, NULL, &amp;error)) {
        printf ("Insert failed: %s\n", error.message);
    }

    bson_destroy (doc);

    doc = bson_new ();
    BSON_APPEND_OID (doc, "_id", &amp;oid);

    if (!mongoc_collection_remove (collection, MONGOC_REMOVE_SINGLE_REMOVE, doc, NULL, &amp;error)) {
        printf ("Delete failed: %s\n", error.message);
    }

    bson_destroy (doc);
    mongoc_collection_destroy (collection);
    mongoc_client_destroy (client);
    mongoc_cleanup ();

    return 0;
}</pre></div></div></div></div></div></div></div>
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<p class="p">Compile the code and run it:</p>
<div class="screen"><pre class="contents "><span class="prompt output">$ gcc -o delete delete.c $(pkg-config --cflags --libs libmongoc-1.0)
$ ./delete</span></pre></div>
<p class="p">On Windows:</p>
<div class="screen"><pre class="contents "><span class="prompt output">C:\&gt; cl.exe /IC:\mongo-c-driver\include\libbson-1.0 /IC:\mongo-c-driver\include\libmongoc-1.0 delete.c
C:\&gt; delete</span></pre></div>
<p class="p">Use the MongoDB shell to prove that the documents have been removed successfully.</p>
<div class="screen"><pre class="contents "><span class="prompt output">$ mongo
MongoDB shell version: 3.0.6
connecting to: test
&gt; use mydb
switched to db mydb
&gt; db.mycoll.count({"hello" : "world"})
0
&gt; </span></pre></div>
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libmongoc-doc 1.3.1-1 / usr / share / doc / libmongoc-doc / html / deleting-document.html
