如何从Python访问Oracle?
如何从Python访问Oracle?我已经下载了一个cx_Oracle msi安装程序,但Python无法导入库 我得到以下错误:如何从Python访问Oracle?,python,oracle,database-connection,cx-oracle,Python,Oracle,Database Connection,Cx Oracle,如何从Python访问Oracle?我已经下载了一个cx_Oracle msi安装程序,但Python无法导入库 我得到以下错误: import cx_Oracle Traceback (most recent call last): File "<pyshell#1>", line 1, in <module> import cx_Oracle ImportError: DLL load failed: The specified module could
import cx_Oracle
Traceback (most recent call last):
File "<pyshell#1>", line 1, in <module>
import cx_Oracle
ImportError: DLL load failed: The specified module could not be found.
导入cx\u Oracle
回溯(最近一次呼叫最后一次):
文件“”,第1行,在
导入cx_Oracle
ImportError:DLL加载失败:找不到指定的模块。
我将非常感谢您的帮助。除了cx_Oracle之外,您还需要安装Oracle客户端库并正确设置路径,以便cx_Oracle能够找到它-请尝试在“Dependency Walker”(依赖项Walker)()中打开cx_Oracle DLL,看看缺少的DLL是什么。以下是对我有效的方法。我的Python和Oracle版本与您的略有不同,但应采用相同的方法。只需确保cx_Oracle二进制安装程序版本与您的Oracle客户端和Python版本匹配即可 我的版本:
import cx_Oracle
dsn_tns = cx_Oracle.makedsn('server', 'port', 'sid')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
c = conn.cursor()
c.execute('select count(*) from TABLE_NAME')
for row in c:
print(row)
conn.close()
import cx_Oracle
dsn_tns = cx_Oracle.makedsn('server', 'port', service_name='service_name')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
c = conn.cursor()
c.execute('select count(*) from TABLE_NAME')
for row in c:
print(row)
conn.close()
- Python 2.7
- Oracle即时客户端11G R2
- cx_Oracle 5.0.4(Unicode、Python 2.7、Oracle 11G)
- WindowsXPSP3
import cx_Oracle
dsn_tns = cx_Oracle.makedsn('server', 'port', 'sid')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
c = conn.cursor()
c.execute('select count(*) from TABLE_NAME')
for row in c:
print(row)
conn.close()
import cx_Oracle
dsn_tns = cx_Oracle.makedsn('server', 'port', service_name='service_name')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
c = conn.cursor()
c.execute('select count(*) from TABLE_NAME')
for row in c:
print(row)
conn.close()
@echo off
set ORACLE_HOME=C:\your\path\to\instantclient_11_2
set PATH=%ORACLE_HOME%;%PATH%
来源:oracle_test.py
import cx_Oracle
conn_str = u'user/password@host:port/service'
conn = cx_Oracle.connect(conn_str)
c = conn.cursor()
c.execute(u'select your_col_1, your_col_2 from your_table')
for row in c:
print row[0], "-", row[1]
conn.close()
可能的问题:
import cx_Oracle
dsn_tns = cx_Oracle.makedsn('server', 'port', 'sid')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
c = conn.cursor()
c.execute('select count(*) from TABLE_NAME')
for row in c:
print(row)
conn.close()
import cx_Oracle
dsn_tns = cx_Oracle.makedsn('server', 'port', service_name='service_name')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
c = conn.cursor()
c.execute('select count(*) from TABLE_NAME')
for row in c:
print(row)
conn.close()
- “ORA-12705:无法访问NLS数据文件或指定的环境无效”-在更改NLS_LANG注册表之前,我遇到了此问题
- “TypeError:参数1必须是unicode,而不是str”-如果需要将连接字符串设置为unicode
- “TypeError:应为None或string”-如果需要将SQL字符串设置为Unicode
- “ImportError:DLL加载失败:找不到指定的过程。”-可能表示cx\U Oracle找不到适当的Oracle客户端DLL
另外,请检查您是否获得了与您的:python、cx_Oracle和instant client版本相匹配的正确版本(32位或64位)。确保这两个版本都有效:-
在windows上很好地解决了这个问题。如果您使用的是virtualenv,那么让驱动程序使用安装程序就不是那么简单了。然后您可以做什么:按照Devon的描述安装它。然后从Python\Lib\site包中复制cx_Oracle.pyd和cx_Oracle-XXX.egg-info文件夹
从虚拟环境导入Lib\site包。当然,在这里,架构和版本也很重要。下面是我的代码的样子。它还显示了如何使用字典使用查询参数的示例。它适用于使用Python 3.6:
import cx_Oracle
CONN_INFO = {
'host': 'xxx.xx.xxx.x',
'port': 12345,
'user': 'SOME_SCHEMA',
'psw': 'SECRETE',
'service': 'service.server.com'
}
CONN_STR = '{user}/{psw}@{host}:{port}/{service}'.format(**CONN_INFO)
QUERY = '''
SELECT
*
FROM
USER
WHERE
NAME = :name
'''
class DB:
def __init__(self):
self.conn = cx_Oracle.connect(CONN_STR)
def query(self, query, params=None):
cursor = self.conn.cursor()
result = cursor.execute(query, params).fetchall()
cursor.close()
return result
db = DB()
result = db.query(QUERY, {'name': 'happy'})
注意:如果您正在使用pandas,您可以通过以下方式访问它:
import pandas as pd
import cx_Oracle
conn= cx_Oracle.connect('username/pwd@host:port/service_name')
try:
query = '''
SELECT * from dual
'''
df = pd.read_sql(con = conn, sql = query)
finally:
conn.close()
df.head()
注:
您可以根据
服务名称
或SID
使用以下任一方法
带有SID:
import cx_Oracle
dsn_tns = cx_Oracle.makedsn('server', 'port', 'sid')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
c = conn.cursor()
c.execute('select count(*) from TABLE_NAME')
for row in c:
print(row)
conn.close()
import cx_Oracle
dsn_tns = cx_Oracle.makedsn('server', 'port', service_name='service_name')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
c = conn.cursor()
c.execute('select count(*) from TABLE_NAME')
for row in c:
print(row)
conn.close()
或
服务名称:
import cx_Oracle
dsn_tns = cx_Oracle.makedsn('server', 'port', 'sid')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
c = conn.cursor()
c.execute('select count(*) from TABLE_NAME')
for row in c:
print(row)
conn.close()
import cx_Oracle
dsn_tns = cx_Oracle.makedsn('server', 'port', service_name='service_name')
conn = cx_Oracle.connect(user='username', password='password', dsn=dsn_tns)
c = conn.cursor()
c.execute('select count(*) from TABLE_NAME')
for row in c:
print(row)
conn.close()
您下载了哪款cx_Oracle。另外,您使用的是哪种版本的Python、哪种版本的Oracle以及哪种操作系统?cx_Oracle-5.0.2-10g.win32-PY26听起来可能不会被提取到Python用于查找模块的路径中。您是否尝试过使用easy_install而不是显式安装它(可能缺少另一个依赖项)。此特定错误意味着Oracle客户端OCI DDL是为不同的平台编译的。32位vs 64或Intel vs AMD。这不是故意的,但不知道这是如何产生的。有人知道,只要所有版本号和平台保持一致,这是否适用于其他版本(即3.4?和64位)吗?@TheRedPea这对我来说适用于ve