Shulou(Shulou.com)06/01 Report--

First, the characteristics of MongoDB database and the characteristics of installing MongoDB database are document-oriented, mode free json data model (bson) (can be understood as a dictionary) multi-level index high availability replication set horizontal expansion cross-platform, multi-language interface weak transaction type big data, high concurrency, weak transaction web2.0 Internet application. Advantages: weak consistency, document format storage, built-in gridFS (distributed file system) disadvantages: do not support transactions, large space-consuming MongoDB database installation: click next all the way Finish configuration environment variable: configure the bin directory into the environment variable to execute: cmd > mongod-v (test whether the environment variable is configured) create the following folder (file path is as follows:) 1 New data folder 2 New log folder 3 New mongo.conf File 4 New mongo.cfg File (under log folder) File path: Server |-bin |-file path Data |-log |-mongo.cfg |-mongo.conf edit the mongo.conf file (add the following) dbpath=C:\ Program Files\ MongoDB\ Server\ 3.6\ data # Database path software installation directory (mine is the default directory) logpath=C:\ Program Files\ MongoDB\ Server\ 3.6\ log\ mongo. Cfg # Log output file path logappend=true # error log uses append mode journal=true # enable log file Enable quiet=true # by default to filter out some useless log information If you need to debug and use, please set the false port=27017 # port number to 27017 by default to install the MongoDB service: (cmd executes as an administrator) mongod-- config "C:\ Program Files\ MongoDB\ Server\ 3.6\ mongo.conf"-- install-- serviceName "MongoDB" start the service: cmd administrator startup > net start MongoDB II, basic syntax: MongoDB common data type String: the most commonly used stored data type. The string in MongoDB must be utf-8. Integer: used to store values. (32-bit / 64-bit) Boolean: stores Boolean values (true/false) Double: stores floating-point values. Min/Max keys: used to compare the lowest and highest values of the Bson element. Arrays: use this type of array / list / multiple values to store to a key Timestamp: timestamp. (convenient record files have been modified / added) Object: for embedded files. Null: stores null values. Symbol: the same for strings, but it is usually reserved for languages of specific symbol types. Date: stores the Unix time format of the current date / time. You can specify your own date and time / date and day of the year to create the object. ObjectID: the ID used to store the document. Binary data: stores binary data. Code: Javascript code that is stored in a document. Regular expression: used to store regular expression database add, delete, modify, create library / delete library / create collection / delete collection creation library: use db_name # use / create database (create database if it does not exist) db # check the currently selected database show dbs # shows which databases are currently available show tables/show collections # View Datasheet delete library: db.dropDatabase () # this will delete the selected database. If no database is selected, the Test database is deleted by default. Create collections: there is no concept of tables in mongodb. Collections (collections) are equivalent to tables in traditional databases. Syntax: db.createCollection (name,option) demo: > use test # enter the database switched to db test > db.createCollection ("mycollection") # create myCollection collection {"ok" 1} > show collections # check commands for creating collections mycollection system.indexes delete collections > use mydb # check available collections in database mydb switched to db mydb > show collections # check collection mycol mycollection > db.mycollection.drop () # Delete collection true drop () method returns true Successfully discarded Otherwise, return false > show collections # to check the collection list in the database again mycol system.indexes yiibaiMongoDB insert document (Insert () / save method) syntax: insert basic syntax such as: > db.COLLECTION_NAME.insert (document) db.mycol.insert ({title: 'MongoDB Overview') Description:'MongoDB id no sql database', by: 'tutorials yiibai', url:' http://www.yiibai.com', tags: ['mongodb','database','NoSQL'] Like: 100}) db.collection_name.find () # shows the inserted data is inserted into multiple documents: db.mycol.insert ([{}, {}]) db.score.insert ([{name: "Zhang San", subject: "Geography", score:88}) {name: "Li Si", subject: "Chinese", score:87}]) MongoDB update document (update () / save () method)

Updata () updates the existing document value / save () to replace the existing document value. The basic syntax of updata () is as follows: > db.COLLECTION_NAME.update (selection_criteria,updated_data) # mycol collection file: {"_ id": ObjectID (4685481851451we55), "title": "MongoDB overview"} {"_ id": ObjectID (4685481851451we56), "title": "NoSQL overview"} {"_ id": ObjectID (4685481851451we57), "title": "tutorials overview"} > db.mycol.update ({"title": "MongoDB overview"}) {$set: {"title": "tutorials overview"}) # Update title > db.mycol.update ({"title": "MongoDB overview"}, {$set: {"title": "tutorials overview"}}) {multi:true}) # to implement multiple updates followed by {multi:true} > db.mycol.find () # query inserted data save () method to replace all existing data that conforms to this ID document > db.collection_name.save ({id.ObjectID (), new_data}) db.mycol.save ({"_ id": ObjectID (5689745956adf56as7)) "title": "yiibai new topic", "by": "yiibai"}) > db.mycol.find () # query inserted data

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.