scala mongodb tutorial

, the default configuration file in/usr/local/etc under the mongod.conf # Store Data In/usr/local/var/mongodb instead of the default/data/db dbpath =/data/db # Append Logs To/usr/loc Al/var/log/mongodb/mongo.log logpath =/usr/local/var/log/mongodb/mongo.log Logappend = True # only Accept local connections bind_ip = 127.0.0.1 After editing: 1.ESC 2.

with $ 4. Cannot be included. (Point number) 5. Keys are case-sensitive and cannot be duplicated for example: {foo:1,foo:1} The naming of collections requires attention to the following points: 1. The collection name cannot be an empty string ("") 2. The collection name cannot contain the \ s character (null character), which represents the end of the collection name 3. The collection name cannot be "system." At the beginning, the prefix is reserved by the system itself 4. The collection name

": "Replsetinitiate quorum check failed because not all proposed set members responded affirmatively:192.168.176. 129:27017 failed with no route to host, 192.168.176.131:27017 failed with no route to host ","Code": 74} 5. View cluster status 　　 This entire replica set has been built. Let's test it now. The master node is responsible for the write operation, so we write on the 130 machine Repset:primary> Db.benxq.insert ({"name":"zhangsan"}) Perform read operations on 131 machines read Repset:se

. Autoindexid Boolean (optional) If true, the default value for the auto-create index _id field is false. Size Number Optionally, specify a maximum size byte capping set. If the cap is true, then you also need to specify this field. Max Number Optionally, specify the maximum number of files allowed in the capping collection. When inserting a document, the MongoDB fir

MongoDB basic Tutorial: CURD help class, mongodbcurd I have been studying MongoDB for the last two days, a powerful document database. My biggest feeling is that compared with traditional relational databases such as SQL or MSQ, it is much simpler to use and configure. Both cluster configuration and Failover save a lot of tedious steps, but what is the most impor

Mongodb installation and configuration tutorial, doscommand, mongodbdos Download: you can download it from the official website. The default installation directory is (C: \ mongodb \) Create a data directory Create a data DIRECTORY And a log directory under the root directory. The data directory should be placed under the root directory (for example, C: \ da

The seventh chapter recommends 4 hours of study time 10 chaptersHow to learn: read it in detail and implement the relevant code manuallyLearning Goals : This tutorial will teach you to install node, build servers, Express, MySQL, MongoDB, write background business logic, write interfaces, and finally complete a complete project backstage, a total of 10 days is expected.node. js Operation MangodbCreate a fol

": ObjectId (" 58e1d2f0bb1bbc3245fa754f ")," Name ":" User3 "," age ": +," sex ":" Woman "} >db.user.find (). Limit (1). Skip (1) {" _id ": ObjectId (" 58e1d2f0bb1bbc3245fa754d ")," name ":" User1 "," age ": +," sex ":" Man "} > The default value for the Skip () method is 0. > Db.user.find () {"_id": ObjectId ("58e1d2f0bb1bbc3245fa754b"), "name": "Liruihuan", "age": +, "sex": "Man"} {"_id": ObjectId ("58e1d2f0bb1bbc3245fa754d"), "name": "User1", "age": +, "sex": "Man"} {"_id": ObjectId ("5

sub-table realization idea-1105th: Horizontal sub-table realization idea-1Section 106th: Horizontal sub-table code implementation-1Section 107th: Horizontal sub-table code implementation-2Section 108th: MySQL Fabric-1Section 109th: MySQL Fabric-2Section 110th: MySQL master-slave replicationSection 111th: Galera mysql cluster-1Section 112th: Galera mysql cluster-2Section 113th: Ha and load balancing for MySQLSection 114th: SQL Optimization methodSection 115th: MySQL server configuration optimiza

How to learn: read it in detail and implement the relevant code manuallyLearning Goals : This tutorial will teach you to install node, build servers, Express, MySQL, MongoDB, write background business logic, write interfaces, and finally complete a complete project backstage, a total of 10 days is expected.node. js Operation MangodbCreate a folder for placing today's files, NPM init initializes, and creates

creates databases and collections when data is stored for the first time in a databaseuse myNewDatabase db.myCollection.insertOne( { x: 1 } ); The above insertOne statement automatically creates the myNewDatabase database, with the myCollection collection. 3.MongoDB additions and deletions to check operation Increase db.collection.insertOne() db.collection.insertMany() By deleting db.collection.deleteOne() db.collec

Tags: io ar strong SP data on CTI BS newSimilar to the normal relational database, when the data is deleted, changed, check, you will use the query conditions, such as the Where in MySQL ...In MongoDB, all the instructions that have been made by PHP are wrapped in arrays:Mongocollection::update ( array $criteria , array $newobj [, array $options = Array ()])Public Mongocursor Mongocollection::find ([ Array $query = array () [, Array $fields = Array ()

First of all to ensure that the correct installation of mongodb, Installation Reference: http://docs.mongodb.org/manual/tutorial/install-mongodb-on-debian-or-Ubuntu-linux Then download the mongodb driver of nodejs Npm install mongodb Compile a test program: Var

Mongodb import collection step tutorial, mongodbcollection It is relatively convenient for companies to use mongodb databases. Today we need to use the RobotMongodb database tool for import. Import steps: Log on to your mongodb server. We need to install it on liunx. Connect to the server via ssh. Step 2: import the f

Use commandMongoDB use database_name is used to create a database. The command creates a new database and returns the existing database if it does not exist.Grammar:The basic syntax for the use DATABASE statement is as follows:Use database_nameExample:If you want to create a database name >use mydbswitched to DB mydb To check the currently selected database using command db>dbmydbIf you want to check the database list, use the command show DBS.>Show dbslocal 0.78125GB0.23012GB The databas

Drop () methodMongoDB's Db.collection.drop () is used to delete a collection from the database.Grammar:The basic syntax for the drop () command is as followsDB. Collection_name. Drop() Example:First, check the available collections in the database MyDB>use mydbswitched to db mydb>show Collectionsmycolmycollectionsystem. Indexesyiibai> Now delete the collection name mycollection>db. MyCollection. Drop()true> Check the list of collections in the database again>show Collectionsmy