MongoDB

1.1update command UPDATE command format: Db.collection.update (Criteria,objnew,upsert,multi) Parameter description: Criteria: Query criteria Objnew:update objects and some update operators Upsert: If there is no record of update, insert objnew

System environment: CentOS x86_64 Tokutek for the MongoDB of the modified version, to a large extent, to solve the mongodb deficiencies, such as disk occupancy space. Open ports:-A input-m state--state new-m tcp-p TCP--dport 80-j ACCEPT-A input-m

MongoDB was used in a recent project, mostly using MongoDB's PHP extension. The method used in MongoDB extensions for a query is find (). Here's a simple note for the experiment in understanding the MongoDB extension's find () method, and hopefully

Background: The original use of MongoDB does not use the account password authentication method to log in, the use of non-authentication mode; Now it needs to be configured to log in and use as an account password, the configuration steps are as

MySQL and MongoDB are common open source Databases , but MySQL is a traditional relational database, MongoDB is a non-relational database, also known as a document database, is a NoSQL database. They each have their own merits, the key is to see

In a MongoDB cluster, if exists orphaned documents and chunk migration, the count query may result in an incorrect query result, such as I was stepping on the pit, first not talking, see the result:Skip can only get to 54631, and count found out 77,3

(1) CREATE DATABASE syntax: Use database_nameFor example:> Use RunoobSwitched to DB runoob> dbRunoob>(2) Delete database syntax: Db.dropdatabase ()For example:Db.dropdatabase () {"Dropped": "Runoob", "OK": 1}(3) Delete collection: Db.collection.drop

Installing MongoDB sudo apt-get install MongoDB... ... Setting up client connections Open File/etc/mongodb.conf Note permissionsModify bind_ip=127.0.0.1 to bind_ip=0.0.0.0 Setting the connection user name and password and

# Articlesmongoexport-d mean-npbao-c articles--type=csv-f _id,type,title,author,brief,html,content,urls,client,created-o/ Root/hmg/articles.csvmongoexport-d mean-npbao-c articles--type=csv-f _id,type-o/root/hmg/articles/type.csvmongoexport-d

About MongoDBMongoDB is a high-performance, open-source, modeless document-based database that is a popular one in the current NoSQL database. It can be used in many scenarios to replace the traditional relational database or key/value storage

MgO is the Golang drive of MongoDB, the test code://mgotest Project Main.go PackageMainImport ( "FMT" "Time" "Gopkg.in/mgo.v2" "Gopkg.in/mgo.v2/bson") type User struct {Id Bson. ObjectId ' Bson:"_ID"' Username string ' Bson:"Name"' Pass string '

Summary:MongoDB 3.0 Security access control, in the addition of users above the 3.0 version and the previous version there is a big difference, here is the next 3.0 of the method of adding users.Environment, testing:After installing MongoDB, first

Definitions and BuildersThe driver have introduced a number of types related to the specification of filters, updates, projections, sorts, and Inde x keys. These types is used throughout the API.Most of the definitions also has builders to aid in

MongoDB Common Command Scripting-automated OPS writes the MONGODB commands commonly used in operations into shell scripts, greatly facilitates maintenance 1 set replica set #!/bin/bash#mongodb Enter the client and use adminCd/usr/mongodb/binMongodb=

MongoDB default is not set authentication, the industry most of the projects using MongoDB also did not set access rights. This means that as long as the port of the MongoDB server is known, anyone who can access the server can query and manipulate

Map-reduce is a computational model, which simply means that a large amount of work (data) decomposition (MAP) is performed, and then the results are combined into the final result (REDUCE).MongoDB offers a very flexible map-reduce, which is also

Export to JSON:$ mongoexport.exe-d testdb-c testcollection-o./test.jsonExport to CSV:If you are want to output CSV, you are specify the fields in the order you want them.$ mongoexport.exe--csv-f _id,f1,f2,f3,f4,f5,f6,f7-d testdb-c

MongoDB 3.0 Security access control, in the addition of users above the 3.0 version and the previous version there is a big difference, here is the next 3.0 of the method of adding users.Create the first user (the user needs to have grant permission,

1.1 Inserting and saving a documentInserting is the basic method of adding data to MongoDB. Using the Insert method on the target machine, insert a document:> Db.foo.insert ({"bar""baz"})This will add a "_id" key to the document (if it is not) and

In the previous article we talked about MongoDB's CRUD basic operations http://blog.csdn.net/stronglyh/article/details/46812579In this case, let's talk about the advanced--------------of MongoDB.A: Various inquiries1: Conditional operator= This