Python使用records库查询sqlite数据库表报错Ca

简单的写法：

import records 

db = records.Database('sqlite:///test.db')
rows = db.query('select * from log')
print (rows.all())

然后报错Cannot operate on a closed database，怎么修改：

import records 

db = records.Database('sqlite:///test.db')
conn = db.get_connection()

rows = conn.query('select * from log')
print (rows.all())