Oracle 特定的时间戳格式 'DD-MON-RR HH.MI.SSXFF AM'

Question

我对 Oracle 11g 特定的时间戳格式有疑问。

这是我拥有的： select to_timestamp('21-OCT-15 08.24.30.000000000 PM','DD-MON-RR HH.MI.SSXFF AM') from dual;

来自数据库的响应：ORA-01855: AM/A.M. or PM/P.M. required 01855. 00000 - "AM/A.M. or PM/P.M. required"

我也尝试过使用多个命令更改会话设置，但仍然没有。

alter session set NLS_LANGUAGE='ENGLISH';
alter session set NLS_DATE_LANGUAGE='ENGLISH';
alter session set NLS_TIMESTAMP_FORMAT = 'DD-MON-RR HH.MI.SSXFF AM';
alter session set NLS_TIMESTAMP_TZ_FORMAT='DD-MON-RR HH.MI.SSXFF AM';

我无法更改 SELECT 语句中的时间戳格式，需要保持原样。我想问题出在会话设置中。

有oracle数据库管理经验的可以给点建议，我试试。我知道有几个类似的帖子，但我没有找到解决方案。谢谢

这是我的会话设置。

select * from nls_session_parameters;

Answer 1

备份您的 NLS 设置 和运行这些设置。

    ALTER SESSION SET NLS_DATE_FORMAT='DD-MON-RRRR HH24:MI:SS';
    ALTER SESSION SET NLS_DATE_LANGUAGE='AMERICAN';
    ALTER SESSION SET NLS_TIME_FORMAT='HH.MI.SSXFF AM';
    ALTER SESSION SET NLS_TIMESTAMP_FORMAT='DD-MON-RR HH.MI.SSXFF AM';
    ALTER SESSION SET NLS_TIME_TZ_FORMAT='HH.MI.SSXFF AM TZR';
    ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT='DD-MON-RRRR HH.MI.SSXFF AM TZR';

然后运行再次SQL语句。

Answer 2

试试这个：SELECT TO_CHAR(TO_TIMESTAMP(**'2015-11-21-13:03:07.04776'**),'DD-MON-RR HH.MI.SSXFF AM') FROM DUAL;引号之间的时间戳格式应该与这个查询的结果相同：SELECT TO_CHAR(LOCALTIMESTAMP) FROM DUAL

Answer 3

最后，我在之前的列表中添加了 Territory，更改了会话属性，使其适用于我。谢谢

ALTER SESSION SET NLS_TERRITORY=AMERICA;
ALTER SESSION SET NLS_DATE_LANGUAGE='AMERICAN';
ALTER SESSION SET NLS_TIME_FORMAT='HH.MI.SSXFF AM';
ALTER SESSION SET NLS_TIMESTAMP_FORMAT='DD-MON-RR HH.MI.SSXFF AM';
ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT='DD-MON-RRRR HH.MI.SSXFF AM TZR';
ALTER SESSION SET NLS_TIME_TZ_FORMAT='HH.MI.SSXFF AM TZR';

Answer 4

核心问题是，在会话级别，您有 nls_numeric_characters=',.' 而您的时间戳字符串包含点 (.) 作为微秒之间的秒分隔符。

to_timestamp() 函数可以接受第三个参数来覆盖 NLS 设置。这是给你的一个小演示......

Connected to Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 
Connected as ******@******

--- This is how it behaves in your database (with "," as the decimals separator) ...

SQL> alter session set nls_numeric_characters = ',.';

Session altered

SQL> select to_timestamp('21-OCT-15 08.24.30.000000000 PM','DD-MON-RR HH.MI.SSXFF AM') as xx from dual;

select to_timestamp('21-OCT-15 08.24.30.000000000 PM','DD-MON-RR HH.MI.SSXFF AM') as xx from dual

ORA-01855: AM/A.M. or PM/P.M. required

--- This is how it behaves in my database (with "." as the decimals separator) ...

SQL> alter session set nls_numeric_characters = '. ';

Session altered

SQL> select to_timestamp('21-OCT-15 08.24.30.000000000 PM','DD-MON-RR HH.MI.SSXFF AM') as xx from dual;

XX
-------------------------------------------------
21.10.15 20:24:30.000000000

--- Now back to your database settings and let's make the conversion NLS-settings-indepenent ...

SQL> alter session set nls_numeric_characters = ',.';

Session altered

SQL> select to_timestamp('21-OCT-15 08.24.30.000000000 PM','DD-MON-RR HH.MI.SSXFF AM', 'nls_numeric_characters = ''. ''') as xx from dual;

XX
-------------------------------------------------
21.10.15 20:24:30,000000000

SQL>

请注意第三个SELECT中to_timestamp()函数的第三个参数。除了所有其他正确答案之外，这也是您可以做的。

Oracle 特定的时间戳格式 'DD-MON-RR HH.MI.SSXFF AM'

Oracle specific timestamp format 'DD-MON-RR HH.MI.SSXFF AM'

database

oracle

database-administration

oracle11g

nls-lang