Mongodb的update操作

最新推荐文章于 2025-05-11 16:29:16 发布
最新推荐文章于 2025-05-11 16:29:16 发布
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分类专栏： Library 文章标签： MongoDB update
    在前面的文章“mongodb 查询的语法”里，我介绍了Mongodb的常用查询语法，Mongodb的update操作也有点复杂，我结合自己的使用经验，在这里介绍一下，给用mongodb的朋友看看，也方便以后自己用到的时候查阅：
注：在这篇文章及上篇文章内讲的语法介绍都是在mongodb shell环境内的，和真正运用语言编程（如java,php等）使用时，在使用方法上会有一些差别，但语法(如查询条件， in, i n , inc等)是一样的。
本文是参考官方文档来介绍的，之所以有官方文档还要在这介绍，一方面是就当翻译，毕竟每次要用时去看英文文档比较累，第二是官方文档讲解比较简单，有时光看官方文档不好理解，我在实际操作的情况下可以做些补充。
好了，不多说了，下面正式开始：
mongodb更新有两个命令：
1).update()命令
db.collection.update( criteria, objNew, upsert, multi )
criteria : update的查询条件，类似sql update查询内where后面的
objNew   : update的对象和一些更新的操作符（如 , , inc…）等，也可以理解为sql update查询内set后面的
upsert   : 这个参数的意思是，如果不存在update的记录，是否插入objNew,true为插入，默认是false，不插入。
multi    : mongodb默认是false,只更新找到的第一条记录，如果这个参数为true,就把按条件查出来多条记录全部更新。
  1. db.test0.update( { ”count” : { $gt : <span class="hljs-number"><span class="hljs-number">1</span></span> } } , { $set : { <span class="hljs-string"><span class="hljs-string">"test2"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span>} } ); 只更新了第一条记录</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">db.test0.update( { <span class="hljs-string"><span class="hljs-string">"count"</span></span> : { $gt : <span class="hljs-number"><span class="hljs-number">3</span></span> } } , { $set : { <span class="hljs-string"><span class="hljs-string">"test2"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span>} },<span class="hljs-keyword"><span class="hljs-keyword">false</span></span>,<span class="hljs-keyword"><span class="hljs-keyword">true</span></span> ); 全更新了</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">db.test0.update( { <span class="hljs-string"><span class="hljs-string">"count"</span></span> : { $gt : <span class="hljs-number"><span class="hljs-number">4</span></span> } } , { $set : { <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span>} },<span class="hljs-keyword"><span class="hljs-keyword">true</span></span>,<span class="hljs-keyword"><span class="hljs-keyword">false</span></span> ); 只加进去了第一条</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">db.test0.update( { <span class="hljs-string"><span class="hljs-string">"count"</span></span> : { $gt : <span class="hljs-number"><span class="hljs-number">5</span></span> } } , { $set : { <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span>} },<span class="hljs-keyword"><span class="hljs-keyword">true</span></span>,<span class="hljs-keyword"><span class="hljs-keyword">true</span></span> ); 全加进去了</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">db.test0.update( { <span class="hljs-string"><span class="hljs-string">"count"</span></span> : { $gt : <span class="hljs-number"><span class="hljs-number">15</span></span> } } , { $inc : { <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">1</span></span>} },<span class="hljs-keyword"><span class="hljs-keyword">false</span></span>,<span class="hljs-keyword"><span class="hljs-keyword">true</span></span> );全更新了</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">db.test0.update( { <span class="hljs-string"><span class="hljs-string">"count"</span></span> : { $gt : <span class="hljs-number"><span class="hljs-number">10</span></span> } } , { $inc : { ”count” : 1} },false,false );只更新了第一条

2).save()命令
db.collection.save( x )
x就是要更新的对象，只能是单条记录。
如果在collection内已经存在一个和x对象相同的”_id”的记录。mongodb就会把x对象替换collection内已经存在的记录，否则将会插入x对象，如果x内没有_id,系统会自动生成一个再插入。相当于上面update语句的upsert=true,multi=false的情况。
  1. db.test0.save({count:40,test1:"OK"}); #_id系统会生成
  2. db.test0.save({_id:40,count:40,test1:"OK"}); #如果test0内有_id等于40的，会替换，否则插入。

mongodb的更新操作符：
1) inc 用法：{inc : { field : value } }
意思对一个数字字段field增加value 

   
   
  1. 
     
     
    
      
      
    
     
     
    
     
     
    
      
      
    
       
       &
       
       gt; db.test
       
       0.find( { 
       
       "_id" : 
       
       15 } );
      
      
    
     
     
  2. 
     
     
    
      
      
    
     
     
    
     
     
    
      
      
    
       
       { 
       
       "_id" : { 
       
       "floatApprox" : 
       
       15 }, 
       
       "count" : 
       
       16, 
       
       "test1" : 
       
       "TESTTEST", 
       
       "test2" : 
       
       "OK", 
       
       "test3" : 
       
       "TESTTEST", 
       
       "test4" : 
       
       "OK", 
       
       "test5" : 
       
       "OK" }
      
      
    
     
     
  3. 
     
     
    
      
      
    
     
     
    
     
     
    
      
      
     
      
      
    
     
     
  4. 
     
     
    
      
      
    
     
     
    
     
     
    
      
      
    
       
       &
       
       gt; db.test
       
       0.update( { 
       
       "_id" : 
       
       15 } , { $inc : { <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">1</span></span> } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">17</span></span>, <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : <span class="hljs-string"><span class="hljs-string">"TESTTEST"</span></span>, <span class="hljs-string"><span class="hljs-string">"test2"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span>, <span class="hljs-string"><span class="hljs-string">"test3"</span></span> : <span class="hljs-string"><span class="hljs-string">"TESTTEST"</span></span>, <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { $inc : { <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">2</span></span> } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">19</span></span>, <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : <span class="hljs-string"><span class="hljs-string">"TESTTEST"</span></span>, <span class="hljs-string"><span class="hljs-string">"test2"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span>, <span class="hljs-string"><span class="hljs-string">"test3"</span></span> : <span class="hljs-string"><span class="hljs-string">"TESTTEST"</span></span>, <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { $inc : { 
       
       "count" : -
       
       1 } } );
      
      
    
     
     
  5. 
     
     
    
      
      
    
     
     
    
     
     
    
      
      
    
       
       &
       
       gt; db.test
       
       0.find( { 
       
       "_id" : 
       
       15 } );
      
      
    
     
     
  6. 
     
     
    
      
      
    
     
     
    
     
     
    
      
      
    
       
       { 
       
       "_id" : { 
       
       "floatApprox" : 
       
       15 }, 
       
       "count" : 
       
       18, 
       
       "test1" : 
       
       "TESTTEST", 
       
       "test2" : 
       
       "OK", 
       
       "test3" : 
       
       "TESTTEST", 
       
       "test4" : 
       
       "OK", 
       
       "test5" : 
       
       "OK" }

2) set用法：$set:field:value就是相当于sql的setfield=value，全部数据类型都支持 s e t 用 法 ： $ s e t : f i e l d : v a l u e 就 是 相 当 于 s q l 的 s e t f i e l d = v a l u e ， 全 部 数 据 类 型 都 支 持 set。<pre onclick="hljs.copyCode(event)"><code class="language-perl hljs"><ol class="hljs-ln" style="width:1183px"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { $set : { ”test1” : ”testv1”, ”test2” : ”testv2”, ”test3” : ”testv3”, ”test4” : ”testv4” } } );
  • & gt; db.test 0.find( { ”_id” : 15 } );
  • { ”_id” : { ”floatApprox” : 15 }, ”count” : 18, ”test1” : ”testv1”, ”test2” : ”testv2”, ”test3” : ”testv3”, ”test4” : ”testv4”, ”test5” : ”OK” }

  • 3) unset 
    用法：{     unset 用法：{     unset : { field : 1} }
    顾名思义，就是删除字段了。 
    
 
 
    1. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     &
     
     gt; db.test
     
     0.update( { 
     
     "_id" : 
     
     15 } , { $unset : { <span class="hljs-string"><span class="hljs-string">"test1"</span></span>:<span class="hljs-number"><span class="hljs-number">1</span></span> } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">18</span></span>, <span class="hljs-string"><span class="hljs-string">"test2"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv2"</span></span>, <span class="hljs-string"><span class="hljs-string">"test3"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv3"</span></span>, <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv4"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { $unset : { <span class="hljs-string"><span class="hljs-string">"test2"</span></span>: <span class="hljs-number"><span class="hljs-number">0</span></span> } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">18</span></span>, <span class="hljs-string"><span class="hljs-string">"test3"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv3"</span></span>, <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv4"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { $unset : { <span class="hljs-string"><span class="hljs-string">"test3"</span></span>:asdfasf } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">Fri May <span class="hljs-number"><span class="hljs-number">14</span></span> <span class="hljs-number"><span class="hljs-number">16</span></span>:<span class="hljs-number"><span class="hljs-number">17</span></span>:<span class="hljs-number"><span class="hljs-number">38</span></span> JS Error: ReferenceError: asdfasf is <span class="hljs-keyword"><span class="hljs-keyword">not</span></span> <span class="hljs-keyword"><span class="hljs-keyword">defined</span></span> (shell):<span class="hljs-number"><span class="hljs-number">0</span></span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { $unset : { 
     
     "test3":
     
     "test" } } );
    
    
      
   
   
    2. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     &
     
     gt; db.test
     
     0.find( { 
     
     "_id" : 
     
     15 } );
    
    
      
   
   
    3. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     { 
     
     "_id" : { 
     
     "floatApprox" : 
     
     15 }, 
     
     "count" : 
     
     18, 
     
     "test4" : 
     
     "testv4", 
     
     "test5" : 
     
     "OK" }

    4) push 
    用法：{     push 用法：{     push : { field : value } }把value追加到field里面去，field一定要是数组类型才行，如果field不存在，会新增一个数组类型加进去。<pre οnclick="hljs.copyCode(event)"><code class="language-perl hljs"><ol class="hljs-ln" style="width:1291px"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { set : { <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : [<span class="hljs-string"><span class="hljs-string">"aaa"</span></span>,<span class="hljs-string"><span class="hljs-string">"bbb"</span></span>] } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">18</span></span>, <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : [ <span class="hljs-string"><span class="hljs-string">"aaa"</span></span>, <span class="hljs-string"><span class="hljs-string">"bbb"</span></span> ], <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv4"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { set : { <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : [<span class="hljs-string"><span class="hljs-string">"aaa"</span></span>,<span class="hljs-string"><span class="hljs-string">"bbb"</span></span>] } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">18</span></span>, <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : [ <span class="hljs-string"><span class="hljs-string">"aaa"</span></span>, <span class="hljs-string"><span class="hljs-string">"bbb"</span></span> ], <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv4"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { push : { <span class="hljs-string"><span class="hljs-string">"test1"</span></span>: <span class="hljs-string"><span class="hljs-string">"ccc"</span></span> } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">18</span></span>, <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : [ <span class="hljs-string"><span class="hljs-string">"aaa"</span></span>, <span class="hljs-string"><span class="hljs-string">"bbb"</span></span>, <span class="hljs-string"><span class="hljs-string">"ccc"</span></span> ], <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv4"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { push : { <span class="hljs-string"><span class="hljs-string">"test2"</span></span>: <span class="hljs-string"><span class="hljs-string">"ccc"</span></span> } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">18</span></span>, <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : [ <span class="hljs-string"><span class="hljs-string">"aaa"</span></span>, <span class="hljs-string"><span class="hljs-string">"bbb"</span></span>, <span class="hljs-string"><span class="hljs-string">"ccc"</span></span> ], <span class="hljs-string"><span class="hljs-string">"test2"</span></span> : [ <span class="hljs-string"><span class="hljs-string">"ccc"</span></span> ], <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv4"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="13"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { push : { <span class="hljs-string"><span class="hljs-string">"test2"</span></span>: <span class="hljs-string"><span class="hljs-string">"ccc"</span></span> } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">18</span></span>, <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : [ <span class="hljs-string"><span class="hljs-string">"aaa"</span></span>, <span class="hljs-string"><span class="hljs-string">"bbb"</span></span>, <span class="hljs-string"><span class="hljs-string">"ccc"</span></span> ], <span class="hljs-string"><span class="hljs-string">"test2"</span></span> : [ <span class="hljs-string"><span class="hljs-string">"ccc"</span></span> ], <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv4"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="13"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { push : { ”test1”: [ ”ddd”, ”eee”] } } );
  • & gt; db.test 0.find( { ”_id” : 15 } );
  • { ”_id” : { ”floatApprox” : 15 }, ”count” : 18, ”test1” : [ ”aaa”, ”bbb”, ”ccc”, [ ”ddd”, ”eee” ] ], ”test2” : [ ”ccc” ], ”test4” : ”testv4”, ”test5” : ”OK” }

  • 5) pushAll用法：$pushAll:field:valuearray同 p u s h A l l 用 法 ： $ p u s h A l l : f i e l d : v a l u e a r r a y 同 push,只是一次可以追加多个值到一个数组字段内。<pre οnclick="hljs.copyCode(event)"><code class="language-perl hljs"><ol class="hljs-ln" style="width:1398px"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">18</span></span>, <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : [ <span class="hljs-string"><span class="hljs-string">"aaa"</span></span>, <span class="hljs-string"><span class="hljs-string">"bbb"</span></span>, <span class="hljs-string"><span class="hljs-string">"ccc"</span></span>, [ <span class="hljs-string"><span class="hljs-string">"ddd"</span></span>, <span class="hljs-string"><span class="hljs-string">"eee"</span></span> ] ], <span class="hljs-string"><span class="hljs-string">"test2"</span></span> : [ <span class="hljs-string"><span class="hljs-string">"ccc"</span></span> ], <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv4"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { $pushAll : { ”test1”: [ ”fff”, ”ggg”] } } );
  • & gt; db.test 0.find( { ”_id” : 15 } );
  • { ”_id” : { ”floatApprox” : 15 }, ”count” : 18, ”test1” : [ ”aaa”, ”bbb”, ”ccc”, [ ”ddd”, ”eee” ], ”fff”, ”ggg” ], ”test2” : [ ”ccc” ], ”test4” : ”testv4”, ”test5” : ”OK” }

  • 6)   addToSet 
    用法：{     addToSet 用法：{     addToSet : { field : value } }增加一个值到数组内，而且只有当这个值不在数组内才增加。<pre οnclick="hljs.copyCode(event)"><code class="language-perl hljs"><ol class="hljs-ln" style="width:1629px"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { addToSet : { <span class="hljs-string"><span class="hljs-string">"test1"</span></span>: { addToSet : { <span class="hljs-string"><span class="hljs-string">"test1"</span></span>: { each : [<span class="hljs-string"><span class="hljs-string">"444"</span></span>,<span class="hljs-string"><span class="hljs-string">"555"</span></span>] } } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">18</span></span>, <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : [<span class="hljs-string"><span class="hljs-string">"aaa"</span></span>,<span class="hljs-string"><span class="hljs-string">"bbb"</span></span>,<span class="hljs-string"><span class="hljs-string">"ccc"</span></span>,[<span class="hljs-string"><span class="hljs-string">"ddd"</span></span>,<span class="hljs-string"><span class="hljs-string">"eee"</span></span>],<span class="hljs-string"><span class="hljs-string">"fff"</span></span>,<span class="hljs-string"><span class="hljs-string">"ggg"</span></span>,[<span class="hljs-string"><span class="hljs-string">"111"</span></span>,<span class="hljs-string"><span class="hljs-string">"222"</span></span>],<span class="hljs-string"><span class="hljs-string">"444"</span></span>,<span class="hljs-string"><span class="hljs-string">"555"</span></span>], <span class="hljs-string"><span class="hljs-string">"test2"</span></span> : [ <span class="hljs-string"><span class="hljs-string">"ccc"</span></span> ], <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv4"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { addToSet : { <span class="hljs-string"><span class="hljs-string">"test1"</span></span>: { addToSet : { <span class="hljs-string"><span class="hljs-string">"test1"</span></span>: { each : [<span class="hljs-string"><span class="hljs-string">"444"</span></span>,<span class="hljs-string"><span class="hljs-string">"555"</span></span>] } } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">18</span></span>, <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : [<span class="hljs-string"><span class="hljs-string">"aaa"</span></span>,<span class="hljs-string"><span class="hljs-string">"bbb"</span></span>,<span class="hljs-string"><span class="hljs-string">"ccc"</span></span>,[ <span class="hljs-string"><span class="hljs-string">"ddd"</span></span>, <span class="hljs-string"><span class="hljs-string">"eee"</span></span>],<span class="hljs-string"><span class="hljs-string">"fff"</span></span>,<span class="hljs-string"><span class="hljs-string">"ggg"</span></span>,[<span class="hljs-string"><span class="hljs-string">"111"</span></span>,<span class="hljs-string"><span class="hljs-string">"222"</span></span>],<span class="hljs-string"><span class="hljs-string">"444"</span></span>,<span class="hljs-string"><span class="hljs-string">"555"</span></span>], <span class="hljs-string"><span class="hljs-string">"test2"</span></span> : [ <span class="hljs-string"><span class="hljs-string">"ccc"</span></span> ], <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv4"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { addToSet : { <span class="hljs-string"><span class="hljs-string">"test1"</span></span>: [<span class="hljs-string"><span class="hljs-string">"444"</span></span>,<span class="hljs-string"><span class="hljs-string">"555"</span></span>]  } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">18</span></span>, <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : [<span class="hljs-string"><span class="hljs-string">"aaa"</span></span>,<span class="hljs-string"><span class="hljs-string">"bbb"</span></span>,<span class="hljs-string"><span class="hljs-string">"ccc"</span></span>,[<span class="hljs-string"><span class="hljs-string">"ddd"</span></span>,<span class="hljs-string"><span class="hljs-string">"eee"</span></span>],<span class="hljs-string"><span class="hljs-string">"fff"</span></span>,<span class="hljs-string"><span class="hljs-string">"ggg"</span></span>,[<span class="hljs-string"><span class="hljs-string">"111"</span></span>,<span class="hljs-string"><span class="hljs-string">"222"</span></span>],<span class="hljs-string"><span class="hljs-string">"444"</span></span>,<span class="hljs-string"><span class="hljs-string">"555"</span></span>,[<span class="hljs-string"><span class="hljs-string">"444"</span></span>,<span class="hljs-string"><span class="hljs-string">"555"</span></span>]], <span class="hljs-string"><span class="hljs-string">"test2"</span></span> : [ <span class="hljs-string"><span class="hljs-string">"ccc"</span></span> ], <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv4"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="13"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { addToSet : { <span class="hljs-string"><span class="hljs-string">"test1"</span></span>: [<span class="hljs-string"><span class="hljs-string">"444"</span></span>,<span class="hljs-string"><span class="hljs-string">"555"</span></span>]  } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">18</span></span>, <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : [<span class="hljs-string"><span class="hljs-string">"aaa"</span></span>,<span class="hljs-string"><span class="hljs-string">"bbb"</span></span>,<span class="hljs-string"><span class="hljs-string">"ccc"</span></span>,[<span class="hljs-string"><span class="hljs-string">"ddd"</span></span>,<span class="hljs-string"><span class="hljs-string">"eee"</span></span>],<span class="hljs-string"><span class="hljs-string">"fff"</span></span>,<span class="hljs-string"><span class="hljs-string">"ggg"</span></span>,[<span class="hljs-string"><span class="hljs-string">"111"</span></span>,<span class="hljs-string"><span class="hljs-string">"222"</span></span>],<span class="hljs-string"><span class="hljs-string">"444"</span></span>,<span class="hljs-string"><span class="hljs-string">"555"</span></span>,[<span class="hljs-string"><span class="hljs-string">"444"</span></span>,<span class="hljs-string"><span class="hljs-string">"555"</span></span>]], <span class="hljs-string"><span class="hljs-string">"test2"</span></span> : [ <span class="hljs-string"><span class="hljs-string">"ccc"</span></span> ], <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv4"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="13"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { addToSet : { ”test1”: [ ”444”, ”555”] } } );
  • & gt; db.test 0.find( { ”_id” : 15 } );
  • { ”_id” : { ”floatApprox” : 15 }, ”count” : 18, ”test1” : [ ”aaa”, ”bbb”, ”ccc”,[ ”ddd”, ”eee”], ”fff”, ”ggg”,[ ”111”, ”222”], ”444”, ”555”,[ ”444”, ”555”], ”test2” : [ ”ccc” ], ”test4” : ”testv4”, ”test5” : ”OK” }

  • 7) pop删除数组内的一个值用法：删除最后一个值：{ pop删除数组内的一个值用法：删除最后一个值：{ pop : { field : 1 } }
    删除第一个值：{ $pop : { field : -1  } }
    注意，只能删除一个值，也就是说只能用1或-1，而不能用2或-2来删除两条。mongodb 1.1及以后的版本才可以用。 
    
 
 
    1. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     &
     
     gt; db.test
     
     0.find( { 
     
     "_id" : 
     
     15 } );
    
    
      
   
   
    2. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     { 
     
     "_id" : { 
     
     "floatApprox" : 
     
     15 }, 
     
     "count" : 
     
     18, 
     
     "test1" : [ 
     
     "bbb", 
     
     "ccc", [
     
     "ddd", 
     
     "eee"],  
     
     "fff", 
     
     "ggg",  [ 
     
     "111", 
     
     "222" ], 
     
     "444"], 
     
     "test2" : [ 
     
     "ccc" ], 
     
     "test4" : 
     
     "testv4", 
     
     "test5" : 
     
     "OK" }
    
    
      
   
   
    3. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
       
    
    
      
   
   
    4. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     &
     
     gt; db.test
     
     0.update( { 
     
     "_id" : 
     
     15 } , { $pop : { <span class="hljs-string"><span class="hljs-string">"test1"</span></span>: -<span class="hljs-number"><span class="hljs-number">1</span></span> } } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.find( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } );</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : { <span class="hljs-string"><span class="hljs-string">"floatApprox"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> }, <span class="hljs-string"><span class="hljs-string">"count"</span></span> : <span class="hljs-number"><span class="hljs-number">18</span></span>, <span class="hljs-string"><span class="hljs-string">"test1"</span></span> : [<span class="hljs-string"><span class="hljs-string">"ccc"</span></span>, [<span class="hljs-string"><span class="hljs-string">"ddd"</span></span>,<span class="hljs-string"><span class="hljs-string">"eee"</span></span>],<span class="hljs-string"><span class="hljs-string">"fff"</span></span>,<span class="hljs-string"><span class="hljs-string">"ggg"</span></span>,[<span class="hljs-string"><span class="hljs-string">"111"</span></span>,<span class="hljs-string"><span class="hljs-string">"222"</span></span>],<span class="hljs-string"><span class="hljs-string">"444"</span></span>], <span class="hljs-string"><span class="hljs-string">"test2"</span></span> : [ <span class="hljs-string"><span class="hljs-string">"ccc"</span></span> ], <span class="hljs-string"><span class="hljs-string">"test4"</span></span> : <span class="hljs-string"><span class="hljs-string">"testv4"</span></span>, <span class="hljs-string"><span class="hljs-string">"test5"</span></span> : <span class="hljs-string"><span class="hljs-string">"OK"</span></span> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; db.test<span class="hljs-number"><span class="hljs-number">0</span></span>.update( { <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-number"><span class="hljs-number">15</span></span> } , { $pop : { 
     
     "test1": 
     
     1 } } );
    
    
      
   
   
    5. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     &
     
     gt; db.test
     
     0.find( { 
     
     "_id" : 
     
     15 } );
    
    
      
   
   
    6. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     { 
     
     "_id" : { 
     
     "floatApprox" : 
     
     15 }, 
     
     "count" : 
     
     18, 
     
     "test1" : [ 
     
     "ccc", [ 
     
     "ddd", 
     
     "eee" ], 
     
     "fff", 
     
     "ggg", [ 
     
     "111", 
     
     "222" ] ], 
     
     "test2" : [ 
     
     "ccc" ], 
     
     "test4" : 
     
     "testv4",
     
     "test5" : 
     
     "OK" }

    8) pull用法： p u l l 用 法 ： pull : { field : value } }从数组field内删除一个等于value值。 
    
 
 
    1. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     &
     
     gt; db.test
     
     0.find( { 
     
     "_id" : 
     
     15 } );
    
    
      
   
   
    2. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     { 
     
     "_id" : { 
     
     "floatApprox" : 
     
     15 }, 
     
     "count" : 
     
     18, 
     
     "test1" : [ 
     
     "ccc", [ 
     
     "ddd", 
     
     "eee" ], 
     
     "fff", 
     
     "ggg", [ 
     
     "111", 
     
     "222" ] ], 
     
     "test2" : [ 
     
     "ccc" ], 
     
     "test4" : 
     
     "testv4",
     
     "test5" : 
     
     "OK" }
    
    
      
   
   
    3. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
       
    
    
      
   
   
    4. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     &
     
     gt; db.test
     
     0.update( { 
     
     "_id" : 
     
     15 } , { $pull : { 
     
     "test1": 
     
     "ggg" } } );
    
    
      
   
   
    5. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     &
     
     gt; db.test
     
     0.find( { 
     
     "_id" : 
     
     15 } );
    
    
      
   
   
    6. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     { 
     
     "_id" : { 
     
     "floatApprox" : 
     
     15 }, 
     
     "count" : 
     
     18, 
     
     "test1" : [ 
     
     "ccc", [ 
     
     "ddd", 
     
     "eee" ], 
     
     "fff", [ 
     
     "111", 
     
     "222" ] ], 
     
     "test2" : [ 
     
     "ccc" ], 
     
     "test4" : 
     
     "testv4", 
     
     "test5" : 
     
     "OK" }

    9) pullAll用法：$pullAll:field:valuearray同 p u l l A l l 用 法 ： $ p u l l A l l : f i e l d : v a l u e a r r a y 同 pull,可以一次删除数组内的多个值。 
    
 
 
    1. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     &
     
     gt; db.test
     
     0.find( { 
     
     "_id" : 
     
     15 } );
    
    
      
   
   
    2. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     { 
     
     "_id" : { 
     
     "floatApprox" : 
     
     15 }, 
     
     "count" : 
     
     18, 
     
     "test1" : [ 
     
     "ccc", [ 
     
     "ddd", 
     
     "eee" ], 
     
     "fff", [ 
     
     "111", 
     
     "222" ] ], 
     
     "test2" : [ 
     
     "ccc" ], 
     
     "test4" : 
     
     "testv4", 
     
     "test5" : 
     
     "OK" }
    
    
      
   
   
    3. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
       
    
    
      
   
   
    4. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     &
     
     gt; db.test
     
     0.update( { 
     
     "_id" : 
     
     15 } , { $pullAll : { 
     
     "test1": [ 
     
     "ccc" , 
     
     "fff" ] } } );
    
    
      
   
   
    5. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     &
     
     gt; db.test
     
     0.find( { 
     
     "_id" : 
     
     15 } );
    
    
      
   
   
    6. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     { 
     
     "_id" : { 
     
     "floatApprox" : 
     
     15 }, 
     
     "count" : 
     
     18, 
     
     "test1" : [ [ 
     
     "ddd", 
     
     "eee" ], [ 
     
     "111", 
     
     "222" ] ], 
     
     "test2" : [ 
     
     "ccc" ], 
     
     "test4" : 
     
     "testv4", 
     
     "test5" : 
     
     "OK" }

    10) 操作符 操 作 符 是他自己的意思，代表按条件找出的数组里面某项他自己。 
    
 
 
    1. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     &
     
     gt; t.find()
    
    
      
   
   
    2. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     { 
     
     "_id" : ObjectId(
     
     "4b97e62bf1d8c7152c9ccb74"), 
     
     "title" : 
     
     "ABC",  
     
     "comments" : [ { 
     
     "by" : 
     
     "joe", 
     
     "votes" : 
     
     3 }, { 
     
     "by" : 
     
     "jane", 
     
     "votes" : 
     
     7 } ] }
    
    
      
   
   
    3. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
       
    
    
      
   
   
    4. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     &
     
     gt; t.update( {
     
     'comments.by':
     
     'joe'}, {$inc:{<span class="hljs-string"><span class="hljs-string">'comments.$.votes':
     
     1}}, false, true )
    
    
      
   
   
    5. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     &
     
     gt; t.find()
    
    
      
   
   
    6. 
   
   
      
    
    
      
   
   
      
   
   
      
    
    
      
     
     { 
     
     "_id" : ObjectId(
     
     "4b97e62bf1d8c7152c9ccb74"), 
     
     "title" : 
     
     "ABC",  
     
     "comments" : [ { 
     
     "by" : 
     
     "joe", 
     
     "votes" : 
     
     4 }, { 
     
     "by" : 
     
     "jane", 
     
     "votes" : 
     
     7 } ] }

    需要注意的是， 只会应用找到的第一条数组项，后面的就不管了。还是看例子：<pre οnclick="hljs.copyCode(event)"><code class="language-swift hljs"><ol class="hljs-ln"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;gt; t.<span class="hljs-built_in"><span class="hljs-built_in">find</span></span>();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-type"><span class="hljs-type">ObjectId</span></span>(<span class="hljs-string"><span class="hljs-string">"4b9e4a1fc583fa1c76198319"</span></span>), <span class="hljs-string"><span class="hljs-string">"x"</span></span> : [ <span class="hljs-number"><span class="hljs-number">1</span></span>, <span class="hljs-number"><span class="hljs-number">2</span></span>, <span class="hljs-number"><span class="hljs-number">3</span></span>, <span class="hljs-number"><span class="hljs-number">2</span></span> ] }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;gt; t.update({x: <span class="hljs-number"><span class="hljs-number">2</span></span>}, { 只会应用找到的第一条数组项，后面的就不管了。还是看例子：<pre οnclick="hljs.copyCode(event)"><code class="language-swift hljs"><ol class="hljs-ln"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;gt; t.<span class="hljs-built_in"><span class="hljs-built_in">find</span></span>();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : <span class="hljs-type"><span class="hljs-type">ObjectId</span></span>(<span class="hljs-string"><span class="hljs-string">"4b9e4a1fc583fa1c76198319"</span></span>), <span class="hljs-string"><span class="hljs-string">"x"</span></span> : [ <span class="hljs-number"><span class="hljs-number">1</span></span>, <span class="hljs-number"><span class="hljs-number">2</span></span>, <span class="hljs-number"><span class="hljs-number">3</span></span>, <span class="hljs-number"><span class="hljs-number">2</span></span> ] }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;gt; t.update({x: <span class="hljs-number"><span class="hljs-number">2</span></span>}, { inc: {<span class="hljs-string"><span class="hljs-string">"x.$”: 1}}, false, true);
  • &gt; t. find();

  • 还有注意的是 配合 配 合 unset使用的时候，会留下一个null的数组项，不过可以用{ pull:{x:null}}删除全部是null的数组项。例：<pre οnclick="hljs.copyCode(event)"><code class="language-perl hljs"><ol class="hljs-ln"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; t.insert({<span class="hljs-keyword"><span class="hljs-keyword">x</span></span>: [<span class="hljs-number"><span class="hljs-number">1</span></span>,<span class="hljs-number"><span class="hljs-number">2</span></span>,<span class="hljs-number"><span class="hljs-number">3</span></span>,<span class="hljs-number"><span class="hljs-number">4</span></span>,<span class="hljs-number"><span class="hljs-number">3</span></span>,<span class="hljs-number"><span class="hljs-number">2</span></span>,<span class="hljs-number"><span class="hljs-number">3</span></span>,<span class="hljs-number"><span class="hljs-number">4</span></span>]})</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; t.find()</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : ObjectId(<span class="hljs-string"><span class="hljs-string">"4bde2ad3755d00000000710e"</span></span>), <span class="hljs-string"><span class="hljs-string">"x"</span></span> : [ <span class="hljs-number"><span class="hljs-number">1</span></span>, <span class="hljs-number"><span class="hljs-number">2</span></span>, <span class="hljs-number"><span class="hljs-number">3</span></span>, <span class="hljs-number"><span class="hljs-number">4</span></span>, <span class="hljs-number"><span class="hljs-number">3</span></span>, <span class="hljs-number"><span class="hljs-number">2</span></span>, <span class="hljs-number"><span class="hljs-number">3</span></span>, <span class="hljs-number"><span class="hljs-number">4</span></span> ] }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; t.update({<span class="hljs-keyword"><span class="hljs-keyword">x</span></span>:<span class="hljs-number"><span class="hljs-number">3</span></span>}, { pull:{x:null}}删除全部是null的数组项。例：<pre οnclick="hljs.copyCode(event)"><code class="language-perl hljs"><ol class="hljs-ln"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; t.insert({<span class="hljs-keyword"><span class="hljs-keyword">x</span></span>: [<span class="hljs-number"><span class="hljs-number">1</span></span>,<span class="hljs-number"><span class="hljs-number">2</span></span>,<span class="hljs-number"><span class="hljs-number">3</span></span>,<span class="hljs-number"><span class="hljs-number">4</span></span>,<span class="hljs-number"><span class="hljs-number">3</span></span>,<span class="hljs-number"><span class="hljs-number">2</span></span>,<span class="hljs-number"><span class="hljs-number">3</span></span>,<span class="hljs-number"><span class="hljs-number">4</span></span>]})</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; t.find()</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">{ <span class="hljs-string"><span class="hljs-string">"_id"</span></span> : ObjectId(<span class="hljs-string"><span class="hljs-string">"4bde2ad3755d00000000710e"</span></span>), <span class="hljs-string"><span class="hljs-string">"x"</span></span> : [ <span class="hljs-number"><span class="hljs-number">1</span></span>, <span class="hljs-number"><span class="hljs-number">2</span></span>, <span class="hljs-number"><span class="hljs-number">3</span></span>, <span class="hljs-number"><span class="hljs-number">4</span></span>, <span class="hljs-number"><span class="hljs-number">3</span></span>, <span class="hljs-number"><span class="hljs-number">2</span></span>, <span class="hljs-number"><span class="hljs-number">3</span></span>, <span class="hljs-number"><span class="hljs-number">4</span></span> ] }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line">&amp;<span class="hljs-keyword"><span class="hljs-keyword">gt</span></span>; t.update({<span class="hljs-keyword"><span class="hljs-keyword">x</span></span>:<span class="hljs-number"><span class="hljs-number">3</span></span>}, { unset:{<span class="hljs-string"><span class="hljs-string"><span class="hljs-string">"x.$”:1}})
  • &gt; t.find()
  • { “_id ” : ObjectId(“ 4bde2ad3755d00000000710e ”), “ x ” : [ 1, 2, null, 4, 3, 2, 3, 4 ] }
  • { “_id ” : ObjectId(“ 4b9e4a1fc583fa1c76198319 ”), “ x ” : [ 1, 3, 3, 2 ] }

  • 转自：http://blog.youkuaiyun.com/qqiabc521/article/details/6325203 
                </div>
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