getting started with mongodb (tcf itpc 2014)
DESCRIPTION
An introduction to MongoDB, a popular NoSQL database, that includes basic CRUD operations with a juxtaposition of MySQL commands.TRANSCRIPT
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Getting Started with MongoDB
TCF IT Professional ConferenceMarch 14, 2014
Michael P. Redlich@mpredli
about.me/mpredli/
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Who’s Mike?
• BS in CS from
• “Petrochemical Research Organization”
• Ai-Logix, Inc. (now AudioCodes)
• Amateur Computer Group of New Jersey
• Publications
• Presentations
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Objectives
• What is MongoDB?
• What is NoSQL?
• Getting Started with MongoDB
• Basic CRUD Operations
• Live Demos (yea!)
• MongoDB Resources
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What is MongoDB? (1)
• “...an open-source document database that provides high performance, high availability, and automatic scaling.”
MongoDB Web Site, http://www.mongodb.org/
• It’s name derived from “humongous”
• Written in C++
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What is MongoDB? (2)
• “...an open-source database used by companies of all sizes, across all industries and for a wide variety of applications. It is an agile database that allows schemas to change quickly as applications evolve, while still providing functionality developers expect from traditional databases...”
MongoDB Products Web Site, http://www.mongodb.com/products/mongodb/
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What is NoSQL?
• Developed to address shortcomings of a traditional SQL relational database, namely:
• big data
• frequency of access to big data
• performance and scalability
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How is MongoDB Used?
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Who is Using MongoDB?
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Features of MongoDB• Document-Oriented
Storage
• Full Index Support
• Replication and High Availability
• Auto-Sharding
• Querying
• Fast In-Place Updates
• Map/Reduce
• GridFS
• Professional Support by MongoDB
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Nomenclature (1)
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RDBMS MongoDB
Database Database
Table Collection
Row Document
Index Index
Join Embedding & Linking
Foreign Key Reference
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Nomenclature (2)
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What is a Document?
• Basic unit of data
• analogous to a row in a RDBMS
• An ordered set of fields (keys) with associated values stored in BSON format
• similar to JSON
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What is BSON?
• “...a binary-encoded serialization of JSON-like documents.”
BSON Web Site, http://www.bsonspec.org/
• Binary JSON
• Designed to be lightweight, traversable, and efficient
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What is a Collection?
• A group of documents
• analogous to a table in a RDBMS
• Schema-less
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Advantages of Documents
• Documents correspond to native data types in many programming languages
• Embedded documents and arrays reduce the need for expensive joins
• Dynamic schema support fluent polymorphism
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Document Structure{
lastName : “Redlich”,
firstName : “Michael”,
email : “[email protected]”
role : {
officer : “President”,
sig : “Java Users Group”
}
}
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field value
embedded document
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Field Names
• Strings
• Cannot contain:
• null
• dots (.)
• dollar sign ($)
• No duplicate field names
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Conventions Used in This Presentation
• Command Prompt ($)
• MySQL prompt (mysql>)
• MongoDB prompt (>)
• Keywords (db, find(), etc.)
• Variables (variable)
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Example Database
• ACGNJ Board of Directors:
• lastName
• firstName
• roles (embedded documents)
• tenure
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Getting Started
• Download MongoDB
• Create a default data directory
• /data/db
• C:\data\db
• Create your first MongoDB database
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Starting MongoDB
• Start an instance of the MongoDB server:
$ mongod
• Start an instance of the MongoDB client (a JavaScript-based shell):
$ mongo
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Mongo Shell (1)
• Show the list of shell commands:
> help
• Show the list of databases:
> show dbs
• Show the current database:
> db
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Mongo Shell (2)
• Specify the database to use or create:
> use database
• Show the collections within the current database:
> show collections
• Show the users within the database:
> show users
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Mongo Shell (3)
• Show the recent system.profile entries:
> show profile
• Tab completion
• Command history
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Primary Key
• Denoted by a special field, _id
• It can be generated:
• Implicitly:
• {_id : ObjectID(value)}
• Explicitly:
• {_id : 2 }, { _id : “MPR”}
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ObjectIDs
• Default type for _id
• A 12-byte hexadecimal BSON type:
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Live Demo!
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Create
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Create a Database
• Create a database in MySQL:
mysql> CREATE DATABASE database;
• Create a database in MongoDB:
> use database
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Create a Collection
• Create a new table in MySQL:
mysql> CREATE TABLE table(column datatype,...);
• Create a new collection in MongoDB:
> db.collection.insert({field:value,...})
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Insert Data
• Insert a row in MySQL:
> INSERT INTO table(column,...) VALUES(value,...);
• Insert a document in MongoDB:
> db.collection.insert({field:value,...})
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Insert Data with Loops
• Insert multiple documents with an array:
> for(int i = 0;i < j;++i) db.collection.insert({field:array[i]});
• Insert multiple documents with variable:
> for(int i = 0;i < j;++i) db.collection.insert({field:i})
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Live Demo!
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Read
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Query (1)
• Retrieve all rows in MySQL:
mysql> SELECT * FROM table;
• Retrieve all documents in MongoDB:
> db.collection.find()
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Query (2)
• Retrieve specified columns in MySQL:
mysql> SELECT column1,column2 FROM table;
• Retrieve specified fields in MongoDB:
> db.collection.find({},{field1:true,field2:true})
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Query (3)
• Retrieve specific rows in MySQL:
mysql> SELECT * FROM table WHERE column = value;
• Retrieve specific documents in MongoDB:
> db.collection.find({field:value})
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Query (4)
• Retrieve specific rows in MySQL:
mysql> SELECT * FROM table WHERE column = value ORDER BY value ASC;
• Retrieve specific documents in MongoDB:
> db.collection.find({field:value}).sort({field:1})
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Query (5)
• Query for multiple documents (returns a cursor):
> db.collection.find()
• Query for one document (returns a single document):
> db.collection.findOne()
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Query Selectors
• Scalar:
• $ne, $mod, $exists, $type, $lt, $lte, $gt, $gte
• Vector:
• $in, $nin, $all, $size
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Query (6)
• Retrieve specific rows in MySQL:
mysql> SELECT * FROM table WHERE column != value;
• Retrieve specific documents in MongoDB:
> db.collection.find({field:{$ne:value}})
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Query (7)
• Retrieve specific rows in MySQL:
mysql> SELECT * FROM table WHERE column1 = value OR column2 = value;
• Retrieve specific documents in MongoDB:
> db.collection.find({$or:[{field:value},{field:value}])
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Query (8)
> db.members.aggregate({$project:{officer:"$roles.officer"}})
> db.members.find({tenure: {$gt:ISODate("2014-12-31")}})
> db.members.find({"roles.officer": {$exists:true}}).sort({"roles.officer":1})
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Query (9)
> db.members.find({"roles.director":{$all:["Director"]}})
> db.members.find({"roles.committee":{$in:["Historian","Newsletter"]}})
> db.members.find({roles:{$size:3}})
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Live Demo!
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Update
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Update (1)
• Update a row in MySQL:
mysql> UPDATE table SET column = value WHERE id = id;
• Update a document in a MongoDB:
> db.collection.update({_id:value},{$set:{field:value}},{multi:true})
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Update (2)
• Update a row in MySQL:
mysql> UPDATE table SET column1 = value WHERE column2 > value;
• Update a document in MongoDB:
> db.collection.update({field1:{$gt:value}},{$set:{field2:value}},{multi:true})
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Update (3)
• Update a document using findOne():
> redlich = db.members.findOne({lastName: "Redlich"})
> redlich.roles = [{sig:"Java Users Group"}]
> db.members.update({lastName: "Redlich"},redlich)
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Atomic Update Operators
• Scalar:
• $inc, $set, $unset
• Vector:
• $push, $pop, $pull, $pushAll, $pullAll, $addToSet
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Update (4)
> db.members.update({lastName: "Redlich"},{$set:{"ISODate("2016-12-31")}})
> db.members.update({"roles.sig"},{$set:{"roles.sig":"JUG"}})
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Delete
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Delete (1)
• Delete all rows in MySQL:
mysql> DELETE FROM table;
• Delete all documents in MongoDB:
> db.collection.remove()
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Delete (2)
• Delete specific rows in MySQL:
mysql> DELETE FROM table WHERE column = value;
• Delete specific documents in MongoDB:
> db.collection.remove({field:value})
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Delete (2)
• Delete a MySQL database
mysql> DROP DATABASE database;
• Delete a MongoDB database
> use database
> db.dropDatabase()
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Backup/Restore
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Export (1)
• Export a collection to a JSON file
• Ensure mongod is running
$ mongoexport --db database --collection collection --out path/filename.json
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Export (2)
• Export a collection to a CSV file
• Ensure mongod is running
• A list of fields is required
$ mongoexport --db database --collection collection --fields field1,field2,... --csv --out path/filename.json
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Import
• Import a collection from a JSON, CSV, or TSV file
• Ensure mongod is running
$ mongoimport --db database --collection collection < path/filename.json
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Dump
• Dump a specified MySQL database:
$ mysqldump -u root --opt database > path.filename.sql
• Dump all MongoDB databases:
• Ensure mongod is not running
$ mongodump --dbpath /data/db --out path
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Live Demo!
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Package Components (1)
• Core Processes
• mongod - core DB process
• mongos - controller & query router (sharding)
• mongo - interactive JavaScript-based shell
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Package Components (2)
• Binary Import and Export
• mongodump - creates BSON dump files
• mongorestore - restores BSON dump files
• bsondump - converts BSON to JSON
• mongooplog - streams oplog entries
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Package Components (3)
• Data Import and Export
• mongoimport - imports JSON, CSV, or TSV data formats
• mongoexport - exports to JSON, CSV, or TSV data formats
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Package Components (4)
• Diagnostic Tools
• mongostat - captures database operations by type (insert, query, etc.)
• mongotop - tracks read/write activity
• mongosniff - provides tracing/sniffing view into database activity
• mongoperf - performance testing tool
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Package Components (5)
• GridFS
• mongofiles - provides a command-line interaction to a GridFS storage system
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MongoDB Resources (1)
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MongoDB Resources (2)
• mongodb.org
• docs.mongodb.org
• mongodb.org/books
• mongodb.com/products/mongodb
• mongodb.com/reference
• bsonspec.org
• education.mongodb.com
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Upcoming Events (1)
• Trenton Computer Festival
• March 14-15, 2014
• tcf-nj.org
• Emerging Technologies for the Enterprise
• April 22-23, 2014
• phillyemergingtech.com
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Upcoming Events (2)
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Thanks!
@mpredli
javasig.org
Sunday, March 16, 14