Class: ActiveRecord::SimpleExplain

Inherits:
Object
  • Object
show all
Defined in:
lib/active_record/simple_explain.rb,
lib/active_record/simple_explain/version.rb,
lib/active_record/simple_explain/connection_adapters/mysql_adapter.rb,
lib/active_record/simple_explain/connection_adapters/sqlite3_adapter.rb,
lib/active_record/simple_explain/connection_adapters/adapter_interface.rb,
lib/active_record/simple_explain/connection_adapters/postgresql_adapter.rb

Defined Under Namespace

Modules: AdapterInterface, MysqlAdapter, PostgreSQLAdapter, SQLite3Adapter

Constant Summary collapse

VERSION = 
"0.0.2"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(adapter, sql) ⇒ SimpleExplain

param

String adapter



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# File 'lib/active_record/simple_explain.rb', line 8

def initialize(adapter, sql)
  #
  # {class => filename}
  #
  @adapters = {}
  init_adapters

  @sql      = sql
  load_adapter(adapter)
end

Instance Attribute Details

#sql ⇒ Object (readonly)

Returns the value of attribute sql.



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# File 'lib/active_record/simple_explain.rb', line 18

def sql
  @sql
end

Instance Method Details

#add_adapter(klass, filename) ⇒ Object 



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# File 'lib/active_record/simple_explain.rb', line 27

def add_adapter(klass, filename)
  @adapters[klass] = filename
end

#display ⇒ Object 



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# File 'lib/active_record/simple_explain.rb', line 46

def display
  puts format(result)
end

#filename(adapter) ⇒ Object 



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# File 'lib/active_record/simple_explain.rb', line 38

def filename(adapter)
  if @adapters.has_key? adapter
    @adapters[adapter]
  else
    adapter.underscore
  end
end

#init_adapters ⇒ Object 



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# File 'lib/active_record/simple_explain.rb', line 20

def init_adapters
  %w(SQLite3Adapter sqlite3_adapter
     PostgreSQLAdapter postgresql_adapter).each_cons(2) { |k, v|
    add_adapter(k, v)
  }
end

#load_adapter(adapter) ⇒ Object 



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# File 'lib/active_record/simple_explain.rb', line 31

def load_adapter(adapter)
  require "active_record/simple_explain/connection_adapters/#{filename(adapter)}"
  self.class_eval {
    include ActiveRecord::SimpleExplain.const_get(adapter)
  }
end

#result ⇒ Object

return

Object ( Adapter::Result or Array )



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# File 'lib/active_record/simple_explain.rb', line 53

def result
  ActiveRecord::Base.connection.execute("#{statement} #{sql}")
end