Class: Mysqlknife::Swap

Inherits:
Object
  • Object
show all
Defined in:
lib/mysqlknife/swap.rb

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Swap

Returns a new instance of Swap.



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# File 'lib/mysqlknife/swap.rb', line 5

def initialize(options = {})
  databases  = options[:databases].split(',')
  @db_from   = databases[0]
  @db_to     = databases[1]
  @conn_from = Connection.new(options, @db_from)
  @conn_to   = Connection.new(options, @db_to)
  @from      = Sql.new(@db_from)
  @to        = Sql.new(@db_to)
end

Instance Method Details

#all ⇒ Object 



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# File 'lib/mysqlknife/swap.rb', line 15

def all
  sql = []

  # Swap tables.
  tables_from = @conn_from.execute(@from.tables)
  tables_from = tables_from.map { |f| f['name'] } if tables_from
  tables_to   = @conn_to.execute(@to.tables)
  tables_to   = tables_to.map { |t| t['name'] } if tables_to
  views_from  = @conn_from.execute(@from.views)
  views_to    = @conn_to.execute(@to.views)

  if tables_from && tables_to
    swap      = tables_from & tables_to
    rename    = (tables_from - tables_to) + (tables_to - tables_from)

    unless swap.empty?
      swap.map do | table |
        sql << @to.swap_table(@db_from, table)
      end
    end

    unless rename.empty?
      rename.map do | table |
        if tables_from.include?(table)
          sql << @from.rename_table(@db_to, table)
        else
          sql << @to.rename_table(@db_from, table)
        end
      end
    end
  end

  # Drop views and create new views in another DB.
  sql << @from.use
  views_from.each do | view |
    sql << @from.drop_view(view['name'])
  end
  views_to.each do | view |
    sql << @from.create_view(view['name'], view['code'])
  end

  sql << @to.use
  views_to.each do | view |
    sql << @to.drop_view(view['name'])
  end
  views_from.each do | view |
    sql << @to.create_view(view['name'], view['code'])
  end

  sql
end