code: def setup(config,  minconn=5, maxconn=10,  adapter='mysql', key='default', slave=False):
      
      global __db
  
      if '.' in key:
          raise TypeError('The DB Key: "%s" Can\'t Contain dot' % (key))
  
      if slave == False and key in __db:
          raise DBError('The Key: "%s" was set' % (key))
  
      database = DB(config, minconn, maxconn, key, adapter)
  
      master_key = key
      slave_key = key + '.slave'
  
      if not slave:
          __db[master_key] = database
          if slave_key not in __db:
              __db[slave_key] = [database]
      else:
          if key in __db:
              databases = __db[slave_key]
              if len(databases) == 1 and __db[master_key] == databases[0]:
                  __db[slave_key] = [database]
              else:
                  __db[slave_key].append(database)
          else:
              __db[slave_key] = [database]
docs: Setup database
  
      :param config dict: is the db adapter config
      :param key string: the key to identify dabtabase
      :param adapter string: the dabtabase adapter current support mysql only
      :param minconn int: the min connection for connection pool
      :param maxconn int: the max connection for connection pool
      :param slave boolean: If True the database can be read only.