Python-oracledb连接数据库报错

写了一个最简单的Python，用来测试和网络内另一台Oracle数据库连接，但是一直在连接步骤报错。

代码非常非常简单，连接字串也是在其他工具里面测试过没问题的。

import oracledb

oracle = oracledb.connect(dsn="SYSADM/SYSADM@172.16.136.100:1521/HR92DMO")

报错内容看起来是连接上了对方的主机，然后就出了这个莫名其妙的错误。

C:\Users\softl\PycharmProjects\FuBoDTS\venv\Scripts\python.exe C:/Users/softl/PycharmProjects/FuBoDTS/main.py
Traceback (most recent call last):
  File "C:\Users\softl\PycharmProjects\FuBoDTS\main.py", line 3, in 
    oracle = oracledb.connect(dsn="SYSADM/SYSADM@172.16.136.100:1521/HR92DMO")
  File "C:\Users\softl\PycharmProjects\FuBoDTS\venv\lib\site-packages\oracledb\connection.py", line 1012, in connect
    return conn_class(dsn=dsn, pool=pool, params=params, **kwargs)
  File "C:\Users\softl\PycharmProjects\FuBoDTS\venv\lib\site-packages\oracledb\connection.py", line 135, in __init__
    impl.connect(params_impl)
  File "src\oracledb\impl/thin/connection.pyx", line 318, in oracledb.thin_impl.ThinConnImpl.connect
  File "src\oracledb\impl/thin/connection.pyx", line 206, in oracledb.thin_impl.ThinConnImpl._connect_with_params
  File "src\oracledb\impl/thin/connection.pyx", line 177, in oracledb.thin_impl.ThinConnImpl._connect_with_description
  File "src\oracledb\impl/thin/connection.pyx", line 118, in oracledb.thin_impl.ThinConnImpl._connect_with_address
  File "src\oracledb\impl/thin/protocol.pyx", line 230, in oracledb.thin_impl.Protocol._connect_phase_two
  File "src\oracledb\impl/thin/protocol.pyx", line 344, in oracledb.thin_impl.Protocol._process_message
  File "src\oracledb\impl/thin/protocol.pyx", line 321, in oracledb.thin_impl.Protocol._process_message
  File "src\oracledb\impl/thin/messages.pyx", line 287, in oracledb.thin_impl.Message.send
  File "src\oracledb\impl/thin/messages.pyx", line 1537, in oracledb.thin_impl.AuthMessage._write_message
  File "src\oracledb\impl/thin/messages.pyx", line 1345, in oracledb.thin_impl.AuthMessage._generate_verifier
KeyError: 'AUTH_PBKDF2_CSK_SALT'

Process finished with exit code 1

自问自答，这真的是一个愚蠢的问题，Oracle客户端版本和服务器版本不一致。

1、删除了开发机上的Oracle客户端，这一步也是麻烦不断，反正多次重启和用命令行删除文件后成功删除。

2、下载正确版本的instant client，其实就是个zip文件，解压缩就可以免安装使用；

3、在Python代码里面指定几个必要的目录，再运行代码就成功了。

import oracledb

#初始化Oracle环境参数
#lib_dir=Oracle客户端安装的主目录
#config_dir=tnsnames.ora所在的目录，SID配置在这个文件里面
oracledb.init_oracle_client(lib_dir=r"C:\Oracle\instantclient_12_1", config_dir=r"C:\Oracle\instantclient_12_1\network\admin")

connection = oracledb.connect(user="SYSADM", password="SYSADM", dsn="172.16.136.100/HR92DMO")

cur = connection.cursor()
cur.execute("select * from PS_COMPANY_TBL")
while True:
    row = cur.fetchone()
    if row is None:
        break
    print(row)

我记得cx_Oracle使用这个包链接的数据库，推荐用PyOdbc