    # File lib/memcache/pg_server.rb, line 30
        def get(keys)
          return get([keys])[keys.to_s] unless keys.kind_of?(Array)
          return {} if keys.empty?

          keys = keys.collect {|key| quote(key.to_s)}.join(',')
          sql = %{
            SELECT key, value FROM #{table}
              WHERE key IN (#{keys}) AND #{prefix_clause} AND #{expiry_clause}
          }
          results = {}
          db.query(sql).each do |key, value|
            results[key] = value
          end
          results
        end