mongodb-driver-c

snriyt

<div id="codeText" class="codeText"><ol style="margin: 0pt 1px 0pt 0pt; padding: 5px 0pt;" start="1" class="dp-css"><li>sql:</li><li>&nbsp;&nbsp; select age from user where name = "tim";</li><li>mongodb:<br></li><li>&nbsp;&nbsp; db.user.find({name:"tim"},{age:1,_id:0});</li><li>mongodb的c api:</li><li>&nbsp; bson query</li><li>&nbsp; bson_init(&amp;query)</li><li>&nbsp; bson_append_string(&amp;query, "name", "tim");</li><li>&nbsp; bson_finish(&amp;query)</li></ol>&nbsp;&nbsp;&nbsp; bson field;<br>&nbsp;&nbsp;&nbsp; bson_init(&amp;field);<br>&nbsp;&nbsp;&nbsp; bson_append_int(&amp;field, "age", 1);<br>&nbsp;&nbsp;&nbsp; bson_append_int(&amp;field, "_id", 0);<br>&nbsp;&nbsp;&nbsp; bson_finish(&amp;field);<br><ol style="margin:0 1px 0 0;padding:5px 0;" start="1" class="dp-css"><li>&nbsp; mongo_find(conn, ns, &amp;query, &amp;field, 0, 0, 0);<br></li></ol></div>