本文介绍了一种使用Python的cx_Oracle库连接Oracle数据库的方法。通过指定用户名、密码和数据库地址，可以成功建立数据库连接并执行SQL查询。文中提供了具体的代码示例。
import cx_Oracle
db = cx_Oracle.connect('hr', 'hrpwd', 'localhost:1521/XE')
#db1 = cx_Oracle.connect('hr/hrpwd@localhost:1521/XE')
# dsn_tns = cx_Oracle.makedsn('localhost', 1521, 'XE')
#print dsn_tns
#db2 = cx_Oracle.connect('hr', 'hrpwd', dsn_tns)
cursor = db.cursor()
print "start"
r = cursor.execute("select ss from MST ")
print "end"
index = 0;
#for row in cursor:
# index+=1;
# print index, row
#for cu in cursor.fetchone():
# print cu;
db = cx_Oracle.connect('hr', 'hrpwd', 'localhost:1521/XE')
#db1 = cx_Oracle.connect('hr/hrpwd@localhost:1521/XE')
# dsn_tns = cx_Oracle.makedsn('localhost', 1521, 'XE')
#print dsn_tns
#db2 = cx_Oracle.connect('hr', 'hrpwd', dsn_tns)
cursor = db.cursor()
print "start"
r = cursor.execute("select ss from MST ")
print "end"
index = 0;
#for row in cursor:
# index+=1;
# print index, row
#for cu in cursor.fetchone():
# print cu;
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