class_docstr: A Database. Encapsulates a url and an SQLAlchemy engine with a pool of
  connections.
class_docstr_tok: ["A","Database",".","Encapsulates","a","url","and","an","SQLAlchemy","engine","with","a","pool","of","connections","."]
docstr: Get a connection to this Database. Connections are retrieved from a
  pool.
docstr_tok: ["Get","a","connection","to","this","Database",".","Connections","are","retrieved","from","a","pool","."]
code: def get_connection(self):
      """Get a connection to this Database. Connections are retrieved from a
      pool.
      """
      if not self.open:
          raise exc.ResourceClosedError("Database closed.")
  
      return Connection(self._engine.connect())
  
imports: import os
  from sys import stdout
  from collections import OrderedDict
  from contextlib import contextmanager
  from inspect import isclass
  import tablib
  from docopt import docopt
  from sqlalchemy import create_engine, exc, inspect, text
label_desc: Use image node_id 7 for calling the Database obj's underlying member method code with example usage: obj.get_connection() and returns: Connection