Creating An Index
创建索引
MongoDB supports indexes, and they are very easy to add on a collection. To create an index, you just specify the field that should be indexed, and specify if you want the index to be ascending (1) or descending (-1). The following creates an ascending index on the "i" field :
MongoDB支持索引，并且很容易添加。只需要指定索引的字段和排序(升序1，降序-1)。下面是创建i降序索引的例子：
Getting a List of Indexes on a Collection
查询collection全部索引
You can get a list of the indexes on a collection :
for (DBObject o : list) {
System.out.println(o);
}
and you should see something like
打印如下：
Quick Tour of the Administrative Functions
管理方法
Getting A List of Databases
查询所有数据库
You can get a list of the available databases:
打印出可用的数据库：
for (String s : m.getDatabaseNames()) {
System.out.println(s);
}
Dropping A Database
删除数据库
You can drop a database by name using the Mongo object:
通过名称删除：
