6

我有以下内容：（使用 ipython）

In [30]: con = cx_Oracle.connect('refill_test02/******@MYDB')

In [31]: cur = con.cursor()

In [32]: cur.execute("ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS' NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF'")

In [33]: cur.execute("select to_date(:0), to_timestamp(:1) from dual", ['2013-03-12', '2013-03-12 08:22:31.332144'])
Out[33]: <__builtin__.OracleCursor on <cx_Oracle.Connection to refill_test02@MYDB>>

In [34]: cur.fetchall()
Out[34]: 
[(datetime.datetime(2013, 3, 12, 0, 0),
  datetime.datetime(2013, 3, 12, 8, 22, 31, 332144))]

In [35]: cur.execute("select to_date(:0), to_timestamp(:1) from dual", [u'2013-03-12', '2013-03-12 08:22:31.332144'])
Out[35]: <__builtin__.OracleCursor on <cx_Oracle.Connection to refill_test02@MYDB>>

In [36]: cur.fetchall()
Out[36]: 
[(datetime.datetime(2013, 3, 12, 0, 0),
  datetime.datetime(2013, 3, 12, 8, 22, 31, 332144))]

In [37]: cur.execute("select to_date(:0), to_timestamp(:1) from dual", [u'2013-03-12', u'2013-03-12 08:22:31.332144'])
---------------------------------------------------------------------------
DatabaseError                             Traceback (most recent call last)
/home/xxxxx/<ipython-input-37-8af80e5fc40c> in <module>()
----> 1 cur.execute("select to_date(:0), to_timestamp(:1) from dual", [u'2013-03-12', u'2013-03-12 08:22:31.332144'])

DatabaseError: ORA-01843: not a valid month


In [38]: cur.execute("select to_date(:0), to_timestamp(:1) from dual", [u'2013-03-12', '2013-03-12 08:22:31.332144'])
---------------------------------------------------------------------------
DatabaseError                             Traceback (most recent call last)
/home/xxxx/<ipython-input-38-bc628f006aa3> in <module>()
----> 1 cur.execute("select to_date(:0), to_timestamp(:1) from dual", [u'2013-03-12', '2013-03-12 08:22:31.332144'])

DatabaseError: ORA-01843: not a valid month


In [39]: cur.execute("ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS' NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF'")

In [40]: cur.execute("select to_date(:0), to_timestamp(:1) from dual", [u'2013-03-12', '2013-03-12 08:22:31.332144'])
Out[40]: <__builtin__.OracleCursor on <cx_Oracle.Connection to refill_test02@MYDB>>

In [41]: cur.fetchall()
Out[41]: 
[(datetime.datetime(2013, 3, 12, 0, 0),
  datetime.datetime(2013, 3, 12, 8, 22, 31, 332144))]

出于某种原因，我不能将 unicode 字符串用于时间戳参数（IN[37]），更奇怪的是，在我这样做之后，我需要重置会话 NLS 格式，然后才能再次使用普通字符串。

我正在使用：Cx_Oracle 5.1.2 python 2.7.3 Oracle 10.2.0.1.0

有任何想法吗？

感谢您花时间阅读本文。

4

3 回答 3

8

这实际上是 Oracle 10.5.0.2 和 11.2.0.1 中的一个错误。

错误可以重现如下：

在会话中设置 NLS_TIMESTAMP_FORMAT。

使用 unicode 数据运行任何隐式或显式 TO_DATE 转换。

下一个带有 unicode 数据的隐式或显式 TO_TIMESTAMP 将触发时间戳格式的内部重置。

所有连续的 TO_TIMESTAMP 都将失败，并且时间戳的 TO_CHAR 将产生无效输出。

这是测试行为的代码：

ALTER SESSION SET NLS_TERRITORY = 'AMERICA';
ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS' NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF';

REM --- WORKS:
SELECT TO_TIMESTAMP('2013-06-24 18:15:10.312') FROM DUAL;

REM --- WORKS:
SELECT TO_DATE('2013-06-24 18:15:10') FROM DUAL;

REM --- WORKS:
SELECT TO_TIMESTAMP('2013-06-24 18:15:10.312') FROM DUAL;

REM --- WORKS:
SELECT TO_TIMESTAMP(x) FROM (SELECT CAST('2013-06-24 18:15:10.312' AS NVARCHAR2(30)) AS X FROM DUAL);

REM --- WORKS:
SELECT TO_DATE(x) FROM (SELECT CAST('2013-06-24 18:15:10' AS NVARCHAR2(30)) AS X FROM DUAL);

REM --- WORKS:
SELECT TO_TIMESTAMP('2013-06-24 18:15:10.312') FROM DUAL;

REM !!! FAILS!
SELECT TO_TIMESTAMP(x) FROM (SELECT CAST('2013-06-24 18:15:10.312' AS NVARCHAR2(30)) AS X FROM DUAL);

REM !!! FAILS!
SELECT TO_TIMESTAMP('2013-06-24 18:15:10.312') FROM DUAL;

REM --- WORKS:
SELECT TO_DATE('2013-06-24 18:15:10') FROM DUAL;
于 2013-06-24T07:02:58.607 回答
4

根据jtiai问题描述，我做了以下解决方法 - 在调用任何有问题的 sql-s（例如 oracle 10.5.0.2 和 11.2.0.1，cx_oracle 5.1.2）之前，再次重置 NLS_DATE_FORMAT/NLS_TIMESTAMP_FORMAT：

cursor.execute(
     "ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS'"
     " NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF'")

# do execute ...
cursor.execute(query, params)
于 2013-10-31T11:46:36.457 回答
1

我无法使用 RHEL 5、Cx_Oracle 5.1 python 2.4.3 Oracle 11.2.0.3.0 重新创建错误 您是否尝试使用带有 to_date 和 to_timestamp 函数的格式字符串？

https://gist.github.com/fclrc/5435561

#! /bin/python
import cx_Oracle
import platform

print ("Python version: " + platform.python_version())
print ("cx_Oracle version: " + cx_Oracle.version)
print ("Oracle client: " + str(cx_Oracle.clientversion()).replace(', ','.'))

connection = cx_Oracle.connect('user/pass@tns')
cursor = connection.cursor()
#
# Option with format strings
#
cursor.execute("""select to_date(:arg1,'yyyy-mm-dd'), to_timestamp(:arg2,'yyyy-mm-dd hh24.mi.ss.ff') from dual""", arg1=u'2013-03-12', arg2=u'2013-03-12 08:22:31.332144')
#
# Option without format strings
#
#cursor.execute("ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS' NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF'")
#cursor.execute("select to_date(:0), to_timestamp(:1) from dual", [u'2013-03-12', u'2013-03-12 08:22:31.332144'])

mydate = cursor.fetchall()
print mydate
cursor.close()
connection.close()
于 2013-04-22T14:49:14.933 回答