import pymysql
# 创建数据库连接
con = pymysql.connect()

sql = '''select
created_time
from schma.table
LIMIT 10'''

try:
  cur = con.cursor(cursor=pymysql.cursors.DictCursor)
  cur.execute(sql)
except Exception as e:
 print(e)
else:
 data = cur.fetchall()
finally:
 cur.close()
 con.close()

for d in data:
 created_time = d.get('created_time')
 print(created_time)

select
cast(created_time as signed) AS created_time 
from schma.table