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