cx_Oracle.DatabaseError:ORA-12514:TNS:侦听器当前不知道连接描述符中请求的服务

Question

我正在尝试Oracle client 12.2 in RHEL 7 linux从Python程序中对新安装进行健全性测试,但是由于上述错误而失败,不确定我在那里缺少什么.请帮忙解决这个问题:

cx_Oracle.DatabaseError: ORA-12514: TNS:listener does not currently know of service 
requested in connect descriptor

我tnsnames.ora目录下的/home文件

  FRDLD2D1 =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(Host = frdld2d1.de.db.com)(Port = 1825))
    )
    (CONNECT_DATA =
      (SID = FRDLD2D1)
      )
   )

我的python程序如下

#!/usr/bin/python
import cx_Oracle
#connection = cx_Oracle.connect('PNTH_LOGGINGB_OWNER/password')
connection = cx_Oracle.connect('PNTH_LOGGINGB_OWNER/password@10.245.63.34:1825/orcl')
cursor = connection.cursor()
querystring = "select * from BDR_JOB_MASTER_LOG where ROWNUM <= 1;"
cursor.execute(querystring)

frdld2d1.de.db.com - IP地址 : 10.245.63.34

感谢是否有人在这里发现故障.

tnsping 实用程序无法测试,因为它是一个instaclient版本

oracle-instantclient12.2-basic-12.2.0.1.0-1.x86_64.rpm.

但是SQLPlus,我可以毫无问题地连接数据库.

Answer 1

请使用此作为您的连接字符串:

connection = cx_Oracle.connect('PNTH_LOGGINGB_OWNER', 'hdgf_76trf', 
                                cx_Oracle.makedsn('10.245.63.34',1825,'FRDLD2D1') );

更改SERVICE_NAME = FRDLD2D1到SID = FRDLD2D1您的TNSNAMES.ORA文件可能是一个选择.

Answer 2

你只需在Python中创建dsn，无需配置文件（tnsnames.ora）

dsn = cx_Oracle.makedsn(host='10.245.63.34', port=1825, sid='FRDLD2D1')
con = cx_Oracle.connect(user='PNTH_LOGGINGB_OWNER', password='password', dsn=dsn)