Python 连接Oracle 数据库，需要使用cx_Oracle 包。
1 下载cx_Oracle
该包的下载地址：http://cx-oracle.sourceforge.net/
下载的时候，注意选择与操作系统和oracle版本相对应的cx_Oracle版本。
2 安装
[root@rac3 python]# rpm -ivh cx_Oracle-5.1.1-11g-py24-1.x86_64.rpm
Preparing... ########################################### [100%]
1:cx_Oracle ########################################### [100%]
3 测试：
oracle@rac3:/home/oracle/python>cat test.py
import cx_Oracle
username = "yang"
userpwd = "yang"
host = "127.0.0.1"
port = 1523
dbname = "yangdb"
dsn=cx_Oracle.makedsn(host, port, dbname)
connection=cx_Oracle.connect(username, userpwd, dsn)
cursor = connection.cursor()
sql = "select * from tab"
cursor.execute(sql)
result = cursor.fetchall()
count = cursor.rowcount
print "====================="
print "Total:", count
print "====================="
for row in result:
print row
cursor.close()
connection.close()
测试结果：
oracle@rac3:/home/oracle/python>python test.py
=====================
Total: 9
=====================
('BIG_TABLE', 'TABLE', None)
('BIN$sgD3dAkmWHfgQPoK8Qcq3Q==$0', 'TABLE', None)
('BIND', 'TABLE', None)
('IM_SMS_ADD_FRIEND', 'TABLE', None)
('PARALTAB', 'TABLE', None)
('T1', 'TABLE', None)
('T2', 'TABLE', None)
('T3', 'TABLE', None)
('T4', 'TABLE', None)
遇到的问题：
1 要在oracle 用户才能执行import cx_Oracle
[root@rac3 ~]# python
Python 2.4.3 (#1, Jan 21 2009, 01:11:33)
[GCC 4.1.2 20071124 (Red Hat 4.1.2-42)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import cx_Oracle
Traceback (most recent call last):
File "", line 1, in ?
ImportError: libclntsh.so.11.1: cannot open shared object file: No such file or directory
>>>
如果在oracle 也遇到 ImportError: libclntsh.so.11.1: cannot open shared object file: No such file or directory
要查看.bash_profile 文件：和环境变量 LD_LIBRARY_PATH有关，一定要设置为：
LD_LIBRARY_PATH=$ORACLE_HOME/lib:/usr/lib:/usr/local/lib;export LD_LIBRARY_PATH
2 ORA-12505: TNS:listener does not currently know of SID given in connect descriptor
oracle@rac3:/home/oracle/python>python test.py
Traceback (most recent call last):
File "test.py", line 10, in ?
connection=cx_Oracle.connect(username, userpwd, dsn)
cx_Oracle.DatabaseError: ORA-12505: TNS:listener does not currently know of SID given in connect descriptor
oracle@rac3:/opt/oracle/11.2.0/alifpre/network/admin>cat tnsnames.ora
# tnsnames.ora Network Configuration File: /opt/oracle/11.2.0/alifpre/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
yangdb =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.250.7.241 )(PORT = 1523))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = yangdb)
)
)
listener.ora 文件中
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /opt/oracle/11.2.0/alifpre)
(PROGRAM = extproc)
)
(SID_DESC =
(GLOBAL_DBNAME = yang)
(ORACLE_HOME = /opt/oracle/11.2.0/alifpre)
(SID_NAME =yangdb)
)
)
(GLOBAL_DBNAME = yang)与tnsnams.ora 文件中的tns连接名不一致导致，修改为yangdb，重新启动监听或者lsnrclt reload 即可
