blocks|key|330498|text|save插入或更新文档。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|330499|insert仅执行插入操作。|330500|但在本例中，它将执行相同的操作，因为保存中提供的文档没有_id字段。|330501|entityMap^0|0|4|0|0|6|0|S|3|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|K|$]]

<code>save</code> insert or update a document.

<code>insert</code> does only an insertion.

But in your case, it will do the same, as the document provided in save has no <code>_id</code> field.

blocks|key|330514|text|正如您在这里看到的，save方法实际上将执行upsert+(如果找到文档，则更新，否则将插入)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|330515|http://docs.mongodb.org/manual/reference/method/db.collection.save/#db.collection.save|offset|length|330516|insert就是这样，一个笔直的Insert。|330517|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|2E|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@$D|Q|E|R|1|S]]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|C]]]]

As you can see here, the save method will essentially do an upsert (update if it finds the doc, insert otherwise):

<a href="http://docs.mongodb.org/manual/reference/method/db.collection.save/#db.collection.save">http://docs.mongodb.org/manual/reference/method/db.collection.save/#db.collection.save</a>

Insert is just that, a straight insert.

blocks|key|330546|text|在Oracle方面:+mongo+=>+Oracle+insert+mongo+=>+Oracle+merge|type|unstyled|depth|inlineStyleRanges|entityRanges|data|330547|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In terms of ORACLE:
mongo insert => Oracle insert
mongo save => Oracle merge

blocks|key|330558|text|如果您尝试将"insert“与先前在同一集合中使用的ID一起使用，您将得到一个重复的键错误。如果您将"save“与同一集合中已有的ID一起使用，它将被更新/覆盖。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|330559|如果你想做一个真正的更新，我建议你使用"+update“。如果您使用集合中已有的ID进行保存，则更新将不会以保存的方式覆盖。|330560|例如，您有两个字段"x“和"y”，您希望保留这两个字段，但更改"x“的值。如果您选择了"+save“命令，并且没有将y包含在先前的值中，或者在您的保存中根本不包含y，那么y将不再具有相同的值或不再存在。但是，如果您选择使用$set进行更新，并且update语句中只包含x，则不会影响y。|330561|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

If you attempt to use "insert" with an ID that was previously used in the same collection you will get a duplicate key error. If you use "save" with an ID that is already in the same collection, it will get updated/overwritten.

If you are looking to do a true update I would suggest using "update". Update will not overwrite in the way Save would if you are Saving using the same ID that is already in the collection.

For example you have two fields "x" and "y" and you want to keep both but change the value of "x". If you chose the "save" command and did not include y with the previous value or not have y at all in your save, then y would no longer have the same value or be there. However if you chose to update using $set and only had x included in your update statement, you would not affect y.

blocks|key|330591|text|考虑下面的文档|type|unstyled|depth|inlineStyleRanges|entityRanges|data|330592|{+"_id"+:+1,+"domainName"+:+"test1.com",+"hosting"+:+"hostgator.com"+}|code-block|syntax|javascript|330593|如果db已包含带有_id:1的文档，则|330594|保存操作将抛出异常，如下所示|330595|E11000+duplicate+key+error+index+...........|330596|而where作为插入操作，将只覆盖文档。|330597|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Consider the below document 

<pre><code>{ "_id" : 1, "domainName" : "test1.com", "hosting" : "hostgator.com" }
</code></pre>

if db already contains the document with _id:1, then

save operation will throw the exception like below 

<pre><code>E11000 duplicate key error index ...........
</code></pre>

and where as insert operation , will just override the document.

blocks|key|330615|text|让我们考虑以下两种情况，以进行保存：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|330616|1)在文档中包含_id。|330617|2)文档中没有_id。|330618|++++++++++++++++++++++++Save+()
++++++++++++++++++++++++/+++++\
+++++++++++++++++++++++/+++++++\

+++++++++++++++++Having+_id+++++Not+Having+_id+

++->In+this+case+save+will+do++++->++It+will+do+normal+insertion+
++++upsert+to+insert.Now+++++++++++++in+this+case+as+insert()+do.
++++what+that+means,+it+means+
++++take+the+document+and+replace+
++++the+complete+document+having+same
++++_id.|code-block|syntax|javascript|330619|让我们考虑一下插入的两种情况：|330620|1)集合中有单据的_id。|330621|2)集合中没有单据的_id。|330622|++++++++++++++++++++++++Insert()
+++++++++++++++++++++++/++++++++\
++++++++++++++++++++++/++++++++++\

+++Doc+Having+_id+in+collection++++Doc+Not+Having+_id+
++->++E11000+duplicate+key+++++->Insert+a+new+doc+inside+the+collection.
++++++error+index:+++++++|330623|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|H|7|11|8|@]|9|@]|A|$I|J]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

Let us consider the two cases here for save :-

1) Having _id in doc.

2) Not having _id in doc.

<pre><code> Save ()
 / \
 / \

 Having _id Not Having _id 

 -&gt;In this case save will do -&gt; It will do normal insertion 
 upsert to insert.Now in this case as insert() do.
 what that means, it means 
 take the document and replace 
 the complete document having same
 _id.
</code></pre>

Let us consider the two cases here for insert:-

1) Having _id of doc in collection.

2) Not having _id of doc in collection.

<pre><code> Insert()
 / \
 / \

 Doc Having _id in collection Doc Not Having _id 
 -&gt; E11000 duplicate key -&gt;Insert a new doc inside the collection.
 error index: 
</code></pre>

blocks|key|330653|text|db.<collection_name>.save(<Document>)等同于InsertOrUpdate查询。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|330654|而db.<collection_name>.insert(<Document>)等同于只插入查询。|330655|entityMap^0|0|11|0|1|13|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

<code>db.&lt;collection_name&gt;.save(&lt;Document&gt;)</code> is equivalent to InsertOrUpdate Query.

While, <code>db.&lt;collection_name&gt;.insert(&lt;Document&gt;)</code> is equivalent to just Insert Query.

What is the difference between save and insert in Mongo DB?
both looks the same 

<pre><code>db.users.save({username:"google",password:"google123"})

db.users.insert({username:"google",password:"google123"})
</code></pre>

What is the difference between save and insert in Mongo DB?

在Mongo DB中保存和插入有什么区别？两者看起来都一样db.users.save({username:"google",password:"google123"})db.users.insert({username:"google",password:"google123"})

问在Mongo DB中保存和插入有什么区别？
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