oracle nls 中文,Oracle中的NLS(转）
NLS： Nation Language Session
NLS_LANG: 語言別以及字符集
NLS_DATE_FORMAT: 日期的顯示格式
NLS_DATE_LANGUAGE: 日期的語言別
-- 查看當前SESSION NLS_LANG
SYS@HUIYI>select * from nls_session_parameters where parameter='NLS_LANGUAGE';
PARAMETER VALUE
-------------------- ------------------------------
NLS_LANGUAGE TRADITIONAL CHINESE
-- 查看數据庫NLS_LANG
SYS@HUIYI>select * from nls_database_parameters
2 where parameter in('NLS_LANGUAGE','NLS_CHARACTERSET');
PARAMETER VALUE
-------------------- ------------------------------
NLS_LANGUAGE AMERICAN
NLS_CHARACTERSET ZHT16MSWIN950
-- TRADITIONAL CHINESE
SYS@HUIYI>select '測試' col from dual;
COL
--------
測試
SYS@HUIYI>d
SP2-0042: 未知的命令 "d" － 此行的剩餘部份被略過不予處理
-- 修改提示語言為英文
-- 英文提示，中文正常顯示
E:>set nls_lang=american_america.zht16mswin950
E:>sqlplus "/ as sysdba"
SYS@HUIYI>d
SP2-0042: unknown command "d" - rest of line ignored.
SYS@HUIYI>select '測試' col from dual;
COL
----
測試
-- 設置成其它字符集(和數据庫不一致)
-- 文字將不能正常顯示
E:>set nls_lang=AMERICAN_AMERICA.ZHS16GBK
E:>sqlplus "/ as sysdba"
SYS@HUIYI>select '測試' col from dual;
COL
--------
測?
SYS@HUIYI>select sysdate from dual;
SYSDATE
----------
06-3月 -07
SYS@HUIYI>alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
已更改階段作業.
SYS@HUIYI>select sysdate from dual;
SYSDATE
-------------------
2007-03-06 17:08:37
SYS@HUIYI>select to_char(sysdate,'Day') col from dual;
COL
------------
星期二
SYS@HUIYI>select to_char(sysdate,'Day','nls_date_language=american') col from dual;
COL
------------------
Tuesday
SYS@HUIYI>alter session set nls_date_language=american;
已更改階段作業.
SYS@HUIYI>select to_char(sysdate,'Day') col from dual;
COL
------------------
Tuesday
SYS@HUIYI>alter session set nls_date_language='TRADITIONAL CHINESE';
已更改階段作業.
SYS@HUIYI>select to_char(sysdate,'Day') col from dual;
COL
------------
星期二
-- 格式化指定字符
SYS@HUIYI>select to_char(sysdate,'yyyy"(year)"mm"(month)"dd"(day)"') col from dual;
COL
----------------------------------------------------
2007(year)03(month)14(day)
-- interval
SYS@HUIYI>select trunc(sysdate)+1/24/60 col from dual;
COL
------------------
14-Mar-07 00:01:00
SYS@HUIYI>select trunc(sysdate)+(interval '1' minute) col from dual;
COL
------------------
14-Mar-07 00:01:00
SYS@HUIYI>select trunc(sysdate) col1,trunc(sysdate)+(interval '01:02:03' hour to second) col2 from dual;
COL1 COL2
------------------ ------------------
14-Mar-07 00:00:00 14-Mar-07 01:02:03
SYS@HUIYI>select trunc(sysdate) col1,trunc(sysdate)+(interval '01:02' hour to minute) col2 from dual;
COL1 COL2
------------------ ------------------
14-Mar-07 00:00:00 14-Mar-07 01:02:00[@more@]