mongodb insert操作

//定义文档 
>doc = { 
  "_id" : 1, 
  "author" : "sam", 
  "title" : "i love you", 
  "text" : "this is a test", 
  "tags" : [ 
    "love", 
    "test" 
  ], 
  "comments" : [ 
    { 
      "author" : "jim", 
      "comment" : "yes" 
    }, 
    { 
      "author" : "tom", 
      "comment" : "no" 
    } 
  ] 
} 
//插入文档 
> db.posts.insert(doc); 
//查找文档 
> db.posts.find({'comments.author':'jim'}); 
{  "_id"  :  1,  "author" :  "sam",  "title"  :  "i  love  you",  "text"  :  "this  is  a  test",  "tags"  : 
[ "love", "test" ], "comments" : [ 
  { 
    "author" : "jim", 
    "comment" : "yes" 
  }, 
  { 
    "author" : "tom", 
    "comment" : "no" 
  } 
] }