mongo duplicate key error

First, backup　　In MongoDB we use the Mongodump command to back up MongoDB data. The command can export all data to the specified directory.The Mongodump command allows you to specify the server to which the exported data can be dumped by parameter.　　

In addition to the tangle of queries, the rest are relatively simple! In fact, when I learned how to add, delete, modify, and query mongodb command lines, I also tried it one by one based on the examples on the official website, so please feel free

In addition to the tangle of queries, the rest are relatively simple! In fact, when I learned how to add, delete, modify, and query mongodb command lines, I also tried it one by one based on the examples on the official website, so please feel free

Query operations 1. Check all records Db.userInfo.find (); Equivalent: select* from UserInfo; 2. Duplicate data for a column in the current clustered collection after the query has been removed

Add toLet's create a set of test and write some data. Create two objects J and T, and save to the collection. In the example ">" to indicate a shell input prompt> j = {name: "MONGO"};{"Name": "MONGO"}> t = {x:3};{"X": 3}> Db.things.save (j);>

If you have never been familiar with MongoDB or have a little understanding of MongoDB, if you are a C # developer, take a few minutes to read this article. This article will take you step by step to get started easily. Read directory 1:

Statement: The article is mainly from the "MongoDB actual Combat" a book, the main want to learn MongoDB knowledge through the book, deepen understanding, so write in their own blog, as a record, in the final chapter, there will be a collection of

http://topmanopensource.iteye.com/blog/1278812### connection notation: [IP Address: port number]MONGO 192.168.1.161:27017;Show dbs;db;--shows the database being usedUse Asdfwerwe_test;Db.tab_data_result.find ();Db.tab_data_period.find ();# # import,

MongoDB installation will not say, please refer to: CentOS Yum installation mongodb and PHP extension One, create, switch, delete database [Root@localhost zhangy]# MONGO MongoDB shell version:2.4.6 connecting To:tank > Use test

MongoDB is a NoSQL database system: A database can contain multiple sets (Collection), each set corresponds to a table in a relational database, and each collection can store a set of records identified by the column, which is freely defined, very