获取“错误”：“使用 Java 驱动程序插入 mongo 时出现 E11000 重复密钥错误
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Getting "err" : "E11000 duplicate key error when inserting into mongo using the Java driver
提问by Nautilus_o
Exception in thread "main" com.mongodb.MongoException$DuplicateKey: { "serverUsed" : "localhost/127.0.0.1:27017" , "err" : "E11000 duplicate key error index: twitterdb03.LevelAFollowers.$iddup key: { : ObjectId('52d5636de408652b4853a8fe') }" , "code" : 11000 , "n" : 0 , "connectionId" : 12 , "ok" : 1.0}
线程“main”com.mongodb.MongoException$DuplicateKey 中的异常：{“serverUsed”：“localhost/127.0.0.1:27017”，“err”：“E11000 重复键错误索引：twitterdb03.LevelAFollowers.$ iddup 键：{ : ObjectId('52d5636de408652b4853a8fe') }" , "code" : 11000 , "n" : 0 , "connectionId" : 12 , "ok" : 1.0}
I'm using mongo 2.11.1
我正在使用 mongo 2.11.1
Never had problems with simple write operations in java
java中的简单写操作从来没有问题
myMap.put(inid, followersList);
myObj.putAll(myMap);
myIdMapCollection.insert(myObj);
回答by Ori Dar
Try calling myIdMapCollection.save(myObj);instead of myIdMapCollection.insert(myObj);
尝试调用myIdMapCollection.save(myObj);而不是myIdMapCollection.insert(myObj);
The savemethod, unlike insertdoes upsert, meaning if a document contains _id, it replaces that document.
该save方法与insertupsert不同，这意味着如果文档包含_id，则替换该文档。
My guess is that you had fetched the DBObjectusing a cursor | query, had manipulated it, and you want to persist the changes. In that case, saveis the right way to do it.
我的猜测是您已经DBObject使用游标获取了| 查询，已经对其进行了操作，并且您希望保留更改。在这种情况下，save是正确的方法。
So, when calling insertthe DBObjectis already associated with _id, calling insertthus fails, because you already have a document with that _idin the collection, which should be unique (duplicate index error).
所以，当调用insert了DBObject已经与相关的_id，称insert这样失败了，因为你已经有一个文档_id集合中，这应该是唯一的（重复的索引错误）。
回答by Florian
I found an answer on this page. I'm guessing your code looks something like this (greatly simplified)?:
我在这个页面上找到了答案。我猜你的代码看起来像这样（大大简化了）？：
doc = {}
for i in xrange(2):
doc['i'] = i
collection.insert(doc)
The problem is that PyMongo injects an _id field into the document, if the _idfield does not exist, before inserting it (_idis always generated client side with 10gen drivers). That means that the first time through the loop _idis added by the insert method. Since docis defined outside the loop, each subsequent pass through the loop uses the samevalue for _id.
问题是 PyMongo 会在文档中注入一个 _id 字段，如果该_id字段不存在，则在插入它之前（_id总是使用 10gen 驱动程序生成客户端）。这意味着第一次通过循环_id是由插入方法添加的。由于doc是在循环外定义的，因此每次后续通过循环都使用相同的值_id。
Solution:
解决方案：
- Delete the key _id
- 删除键_id
for i in xrange(2): doc['i'] = i if '_id' in doc: del doc['_id'] collection.insert(doc)
for i in xrange(2): doc['i'] = i if '_id' in doc: del doc['_id'] collection.insert(doc)
- Or create manually a new one:
- 或者手动创建一个新的：
from bson.objectid import ObjectId for i in xrange(2): doc['i'] = i doc['_id'] = ObjectId() collection.insert(doc)
from bson.objectid import ObjectId for i in xrange(2): doc['i'] = i doc['_id'] = ObjectId() collection.insert(doc)
