除了查詢條件，還可以使用修改器對文檔進行更新。
1. $inc
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 11 }
> db.tianyc03.update({name:'xtt',age:11},{'$inc':{age:5}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "name" : "xtt", "age" : 16 }
#$inc還可以添加列。
> db.tianyc04.find()
{ "_id" : ObjectId("510c83ad13d7e50c2281b048"), "wc" : 1 }
> db.tianyc04.update({wc:1},{$inc:{score:50}})
> db.tianyc04.find()
{ "_id" : ObjectId("510c83ad13d7e50c2281b048"), "score" : 50, "wc" : 1 }
>
2. $set
用來指定一個鍵的值，若該鍵不存在，則創建。如果需要刪除該鍵，使用$unset。
#新增加列sex
> db.tianyc03.update({name:'xtt',age:16},{$set:{sex:'m'}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "name" : "xtt", "sex" : "m" }
#修改列sex
> db.tianyc03.update({name:'xtt',age:16},{$set:{sex:'male'}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "name" : "xtt", "sex" : "male" }
#改變列sex數據類型
> db.tianyc03.update({name:'xtt',age:16},{$set:{sex:1}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "name" : "xtt", "sex" : 1 }
#刪除列sex
> db.tianyc03.update({name:'xtt',age:16},{$unset:{sex:1}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "name" : "xtt" }
3. $push
用來增加數組。若沒有改列，則會自動增加。
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "name" : "xtt" }
> db.tianyc03.update({'name':'xtt'},{$push:{companies:'neu'}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "companies" : [ "neu" ], "name" : "xtt" }
> db.tianyc03.update({'name':'xtt'},{$push:{companies:'alibaba'}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "companies" : [ "neu", "alibaba" ], "name" : "xtt" }
4. $addToSet
#push操作不會檢查數組中元素是否重復，如果需要將不重復的數據加入數組，需要使用$addToSet
> db.tianyc03.update({'name':'xtt'},{$addToSet:{companies:'alibaba'}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "companies" : [ "neu", "alibaba", "alibaba" ], "name" : "xtt" }
> db.tianyc03.update({'name':'xtt'},{$addToSet:{companies:'congxing'}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "companies" : [ "neu", "alibaba", "alibaba", "congxing" ], "name" : "xtt" }
> db.tianyc03.update({'name':'xtt'},{$addToSet:{companies:'congxing'}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "companies" : [ "neu", "alibaba", "alibaba", "congxing" ], "name" : "xtt" }
>
5. $pop
通過$pop可以從數組中移除數據。此時數據被看成是一個隊列。使用{$pop:{key:1}}將從隊列末尾移除元素，使用{$pop:{key:-1}}將從隊列開頭移除元素。
> db.tianyc03.update({'name':'xtt'},{$addToSet:{companies:['c1','c2']}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "companies" : [ "neu", "alibaba", "alibaba", "congxing", [ "c1", "c2" ] ], "name" : "xtt" }
> db.tianyc03.update({'name':'xtt'},{$pop:{companies:1}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "companies" : [ "neu", "alibaba", "alibaba", "congxing" ], "name" : "xtt" }
>
> db.tianyc03.update({'name':'xtt'},{$pop:{companies:-1}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "companies" : [ "alibaba", "alibaba", "congxing" ], "name" : "xtt" }
>
6. $pull
除了 $pop，也可以使用 $pull 來刪除數組中的元素，此時可以根據元素值進行匹配，將匹配上的元素全部刪除。
> db.tianyc03.update({'name':'xtt'},{$addToSet:{companies:'teletek'}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "companies" : [ "alibaba", "alibaba", "congxing", "teletek" ], "name" : "xtt" }
> db.tianyc03.update({},{$pull:{companies:'congxing'}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "companies" : [ "alibaba", "alibaba", "teletek" ], "name" : "xtt" }
> db.tianyc03.update({},{$pull:{companies:'alibaba'}})
> db.tianyc03.find()
{ "_id" : ObjectId("50ea6b6f12729d90ce6e341b"), "age" : 16, "companies" : [ "teletek" ], "name" : "xtt" }
>