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Getting started with MongoDB

mLab

• Database-as-a-Service for MongoDB https://mlab.com/

Installation

• Homebrew package manager http://brew.sh/
• Steps to install MongoDB on OSX https://docs.mongodb.com/manual/tutorial/install-mongodb-on-os-x/

Quick-Start Guides

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/* Group clauses in this order: */

SELECT select_list [ INTO new_table ]

[ FROM table_source ] [ WHERE search_condition ]

[ GROUP BY group_by_expression ]

[ HAVING search_condition ]

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def print_all_names(list_of_names)
  list_of_names.each do |item|
    print item
  end
end

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# Arrays are useful for storing different types of data
diverse_array = [1,2,"abc",[9,9,"zzz"]]

# Hashes are useful for lookup data
lookup_hash = {
  ssn => 1234, 
  dob => "December 25th, 2000", 
  acct_num => 9999
}

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# Initialize Hash
my_hash = {}

# Example hash
my_hash = {
  :dog => "Leo", 
  :Birthday => "August, 24th 1990", 
  :Zodiac => "Virgo"
}

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# Initialize Array
my_array = []

# Example Array
my_array = [1,2,3,4,5]

# Array indexes display items starting from 0 to -1
my_array[0] = 1
my_array[-1] = 5

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/*Example  CSS - follows atomic style CSS*/

.blog-list {                    /*This line references a class called "blog-list"*/
  list-style: none;             /*Any lists within this class should not display bullets*/
  padding-left: 1em;            /*padding to the left of this class element is 1 em*/
}

.page-list {
  list-style: square;
  margin-top: 0em;

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// Accessing JavaScript Object Properties

// Dot Notation
console.log(skateboarder.name) // Prints "Rodney Mullen" to console.

//Brackets
console.log(skateboarder[wheels]) // Prints "undefined" to console.

// The line above evaluates wheels to return "Spitfire", then return undefined as there is no property named "Spitfire".

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# Accessing Ruby Hash Value
print grades[:Jane] #=> prints value 89

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grades = {
  Jane: 89,
  Bill: 88,
  James: 95,
  Jill: 94
}