Metrix DB

Simple DB base on ruby Array. The main usage is data mapping.

Notice: Do not use it in large dataset

Installation

gem install metrix_db

Usage

class MyDB
  include MetrixDB
  field :col1, :uniq => false
  field :col2, :ref => true
  dataset [[1,2],[3,4]]
end

• Include MetrixDB
• Define field using field, the order of field should match index of your dataset
• Set dataset, dataset is the real data of one DB

Field

Options for field definition

uniq: Check if column is unique. Default value is true.

ref: Support [] query syntax. If not set for all field will use first field as ref field

Query

mydb = MyDB.on(:col1 => 1) # nil or instance of MyDB.
mydb.col1 # => 1
mydb.col2 # => 2

use [] as query syntax, it will use ref field to query data.

mydb = MyDB[1] # nil or instance of MyDB.
mydb.col1 # => 1
mydb.col2 # => 2

Iteration

MyDB.all #=>  Array of MyDB instance

MyDB.all.each do |inst|
  puts inst.col1 
end 

MyDB.all.each_with_index do |inst, index|
  puts inst.col1 
end 

MyDB.all.map { |inst| inst.col1 } # [1,2]