mongoDB 获取最后插入的文档的ObjectID/_id方法

桃扇骨 2022-06-18 09:53 218阅读 0赞

http://stackoverflow.com/questions/3338999/get-id-of-last-inserted-document-in-a-mongodb-w-java-driver  
mongoDB api就可以实现，请仔细查看集合insert方法的源代码

a.文档插入后可以获取到插入的文档的ObjectID

代码：

BasicDBObject doc = new BasicDBObject( "name", "Matt" );  
collection.insert( doc );  
ObjectId id = (ObjectId)doc.get( "\_id" );

b.文档插入之前，可以自己生成一个ObjectID，简单的方法如下

代码：

//It‘s safe to do  
  
doc.set("\_id", new ObjectId())  
//if you look at driver code  
  
if ( ensureID && id == null )\{   
    id = ObjectId.get();  
    jo.put( "\_id" , id );        
\}  
  
public static ObjectId get()\{   
    return new ObjectId();  
\}

参看文章链接：

[http://www.thebirdietoldme.com/userActions/thread/Question.aspx?id=3338999][http_www.thebirdietoldme.com_userActions_thread_Question.aspx_id_3338999]

[http://stackoverflow.com/questions/7720256/mongodb-getting-objectid-of-last-inserted-document-with-multiple-concurrent-wr][http_stackoverflow.com_questions_7720256_mongodb-getting-objectid-of-last-inserted-document-with-multiple-concurrent-wr]

[mongoDB 获取最后插入的文档的ObjectID/\_id方法][mongoDB _ObjectID_id]

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原文：http://www.cnblogs.com/svennee/p/4080795.html

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[http_www.thebirdietoldme.com_userActions_thread_Question.aspx_id_3338999]: http://www.thebirdietoldme.com/userActions/thread/Question.aspx?id=3338999
[http_stackoverflow.com_questions_7720256_mongodb-getting-objectid-of-last-inserted-document-with-multiple-concurrent-wr]: http://stackoverflow.com/questions/7720256/mongodb-getting-objectid-of-last-inserted-document-with-multiple-concurrent-wr
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