[Python] Oracle DBに接続する

import datetime

import numpy as np
import pandas as pd
import cx_Oracle as orcl


TARGET_HOST = "xx.xx.x.x"
PORT = "1521"
SERVICE_NAME = "***"
USERNAME = "***"
PASSWORD = "***"

## 接続識別子の作成
tns = orcl.makedsn(TARGET_HOST, PORT, service_name=SERVICE_NAME)

## DBへの接続
ora_con = orcl.connect(USERNAME, PASSWORD, tns)

SQL="""
select *
from table
"""

# データを取得してDataFrameへ変換
df = pd.read_sql(SQL, con=ora_con)
df.head()

## DBセッションの終了
ora_con.close()