python – 使用unicode参数的cx_Oracle’ORA-01843：不是有效月份’
作者：互联网
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,我不能使用unicode字符串作为时间戳参数(IN [37]),更奇怪的是,在我这样做之后,我需要重新设置会话NLS格式,然后再使用普通字符串.
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？
感谢您抽出宝贵时间阅读本文.
解决方法:
它实际上是Oracle 10.5.0.2和11.2.0.1中的一个错误.
Bug可以复制如下：
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.
具有unicode数据的下一个隐式或显式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.
以下是测试行为的代码：
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;
标签：python,unicode,oracle,cx-oracle 来源： https://codeday.me/bug/20190613/1229819.html