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April 12, 2011 17:08
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An example using lolquery
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### | |
# lolquery is an fresh new take on SQL DSLs. NEVER WRITE SQL AGAIN! Using | |
# amazing lolquery technology, you too will never have to write another SQL | |
# statement again! | |
# | |
# Check out this simple example of using lolquery. Bask in it's simplicity, | |
# it's expressiveness, but most importantly, it's lack of writing SQL! | |
# | |
# <3 <3 <3 <3 <3 | |
require 'lolquery' | |
x = SELECT * FROM("users") .WHERE(:id => 10) | |
puts x # => SELECT * FROM "users" WHERE "users"."id" = 10 |
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require 'rubygems' | |
require 'arel' | |
require 'the_fake_record' # stub out AR (stolen from arel tests) | |
class Select < Struct.new(:columns) | |
def self.* other | |
other.select = new(Arel.sql('*')) | |
other | |
end | |
end | |
class From < Struct.new(:table, :conditions) | |
def WHERE conditions | |
self.conditions = conditions | |
Where.new(self) | |
end | |
end | |
class Where < Struct.new(:from, :select) | |
def to_s | |
Arel::Table.engine = Arel::Sql::Engine.new(FakeRecord::Base.new) | |
table = Arel::Table.new from.table | |
table.project(select.columns).where( | |
from.conditions.map { |k,v| table[k].eq v }).to_sql | |
end | |
end | |
SELECT = Select | |
def FROM table | |
From.new table | |
end |
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module FakeRecord | |
class Column < Struct.new(:name, :type) | |
end | |
class Connection | |
attr_reader :tables | |
def initialize | |
@tables = %w{ users photos developers } | |
@columns = { | |
'users' => [ | |
Column.new('id', :integer), | |
Column.new('name', :string), | |
Column.new('bool', :boolean), | |
Column.new('created_at', :date), | |
] | |
} | |
@primary_keys = { | |
'users' => 'id' | |
} | |
end | |
def primary_key name | |
@primary_keys[name.to_s] | |
end | |
def table_exists? name | |
@tables.include? name.to_s | |
end | |
def columns name, message = nil | |
@columns[name.to_s] | |
end | |
def quote_table_name name | |
"\"#{name.to_s}\"" | |
end | |
def quote_column_name name | |
"\"#{name.to_s}\"" | |
end | |
def quote thing, column = nil | |
if column && column.type == :integer | |
return 'NULL' if thing.nil? | |
return thing.to_i | |
end | |
case thing | |
when true | |
"'t'" | |
when false | |
"'f'" | |
when nil | |
'NULL' | |
when Numeric | |
thing | |
else | |
"'#{thing}'" | |
end | |
end | |
end | |
class ConnectionPool | |
class Spec < Struct.new(:config) | |
end | |
attr_reader :spec, :connection | |
def initialize | |
@spec = Spec.new(:adapter => 'america') | |
@connection = Connection.new | |
end | |
def with_connection | |
yield connection | |
end | |
end | |
class Base | |
attr_accessor :connection_pool | |
def initialize | |
@connection_pool = ConnectionPool.new | |
end | |
def connection | |
connection_pool.connection | |
end | |
end | |
end |
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Is there support for MongoDB, I mean... not writing NoSQL would be even better!