MongoDB

MongoDB as a non-relational database. or the traditional database of the addition and deletion of the changes have a very big difference. This is just a little bit of knowledge, sketchy, practical use. We baidu a bit specific use method can. Let's

This chapter we learn about MongoDB query operations.Introduction to findThe Find method is used to perform the query operation of MongoDB. It returns a subset of documents in Collecion, which returns the entire collection data without adding

Reference: http://www.cnblogs.com/lzrabbit/p/3682510.html Reference: http://blog.csdn.net/qqiabc521/article/details/6325203 1) MongoDB installation as a Windows service After downloading and extracting the website Mongod--dbpath

Query.all ("name", "a", "B");//match array with multiple elementsQuery.and (Query.eq ("name", "a"), Query.eq ("title", "T"));//satisfy multiple conditions at the same timeQuery.eq ("name", "a");//equalsQuery.exists ("type", true);//Determine if key

MongoDB supports a list of many data types as given below: String: This is the most commonly used data type to store data. The string in MongoDB must be a valid UTF-8. Integer: This type is used to store a numeric value. The integer can

MongoDB installation and simple useFirst install MongoDB1.:http://www.mongodb.org/downloads2. Unzip to the directory you want to install, such as D:\mongodb3. Configure the environment variable, the installed directory Path:d:\mongodb\bin added in

1 ? PHP2 3$mongo=New Mongoclient ("MongoDB://127.0.0.1:2222/admin:admin ");4 5$collection=$mongo -RRs -content;6 7 /*Database Insert*/8$content=Array (9 'title'='title',Ten 'author'='Jacson', One 'URL'='http://www.cnblogs.com', A );

The documentation is as follows:/* 0 */{ "_id": ObjectId ("55d09915331c571b60035d95"), "title": "Hello World", "comment": [{ "author" : "Joe", "score": 3 }, { "author": "Tom", "score": 5 }, { "author": "Jean", "

1, when you open the MongoDB service without adding any parameters, you can operate on the database arbitrarily, and can access the database remotely. If you specify the auth parameter when you start, you can authenticate the database with user

Share the next MongoDB in the basic operation of the index, we do not avoid the daily development of the program to optimize performance, and the operation of the program is nothing more than curd, usually weAnd will spend 50% of the time on the R,

ObjectiveIn the previous "Java MongoDB query (a) simple query" We have a simple look at the following query, but only those queries are not enough, but also need complex queries, this is described in this article.1. Data structureCollection:

Recently in the study of the website of Nodejs Building Station course, there is a MongoDB database installation, the video author did not talk about, so I went to find the information installed, here to record the installation process.First login

The latest version of MongoDB is downloaded under the Download menu on the official website: http://www.mongodb.org/downloads1: Unzip the database under the MongoDB2: Create the Data folder under the Bin directory and create the DB and Logs folders

MongoDB 3.0 is a revolutionary version, thanks to the new storage engine Wiredtiger, which greatly improves performance while improving data compression (300%).Performance comparison See:

Querying an existing database >show DBS2. Create a database, you need to create a collection this Coucay creates>use MyDB3. View Collections>show Collections or >show tables4. Create a document and insert data>db.userinfo.insert ({_id:1,name:

Tough Document Replacement Update operation Db. [Documentname].update ({finder},{modifier})2. The primary key conflict will error and stop the update operation, when the hard-to-replace document and the existing document ID conflict, the system

Can't connect remotely?! Certification failed?!In order to improve the security of remote access, according to the description of MongoDB official website, increased user authentication, local testing through, however, remote access is still alive,

1. Get from http://www.mongodb.org/downloads, download MongoDB for Windows version, note the difference between 32-bit and 64-bit2. Unzip the downloaded zip version to D:/mongodb3. Create a storage location for the database files. The default

Use excel for data mining (4) ---- highlight Abnormal Values Use excel for data mining (4) ---- highlight Abnormal Values   After configuring the environment, you can use excel for data mining. For environment configuration problems, see: Http:/

Be alert to InnoDB and MyISAM Hash index creation trapsMySql common storage engines InnoDB and MyISAM do not support Hash indexes. Their default indexes are B-Tree. However, if you define the index type as Hash when creating the index, MySql will