关于Oracle客户端显示乱码问题

 看下面演示与分析：

SQL> select * from nls_database_parameters;

 

PARAMETER                      VALUE

------------------------------ ------------------------------

NLS_LANGUAGE                   AMERICAN

NLS_TERRITORY                  AMERICA

NLS_CURRENCY                   $

NLS_ISO_CURRENCY               AMERICA

NLS_NUMERIC_CHARACTERS         .,

NLS_CHARACTERSET               AL32UTF8

NLS_CALENDAR                   GREGORIAN

NLS_DATE_FORMAT                DD-MON-RR

NLS_DATE_LANGUAGE              AMERICAN

NLS_SORT                       BINARY

NLS_TIME_FORMAT                HH.MI.SSXFF AM

 

PARAMETER                      VALUE

------------------------------ ------------------------------

NLS_TIMESTAMP_FORMAT           DD-MON-RR HH.MI.SSXFF AM

NLS_TIME_TZ_FORMAT             HH.MI.SSXFF AM TZR

NLS_TIMESTAMP_TZ_FORMAT        DD-MON-RR HH.MI.SSXFF AM TZR

NLS_DUAL_CURRENCY              $

NLS_COMP                       BINARY

NLS_LENGTH_SEMANTICS           BYTE

NLS_NCHAR_CONV_EXCP            FALSE

NLS_NCHAR_CHARACTERSET         AL16UTF16

NLS_RDBMS_VERSION              9.2.0.4.0

 

20 rows selected.

 

windows 客户机上： 

H:\Users\LuoTaoyang>chcp

活动代码页: 936

 

H:\Users\LuoTaoyang>set NLS_LANG=American_America.ZHS16GBK

 

 

SQL> DESC chartest;

 Name                                      Null?    Type

 ----------------------------------------- -------- ----------------------------

 

 ID                                                 NUMBER(38)

 NAME                                               VARCHAR2(20)

 

SQL> insert into chartest values(1,'123 你好吗ABC');

1 row created.

SQL> SELECT * from chartest;

        ID NAME
---------- ----------------------------------------
         1 123 你好吗ABC

SQL> select id,dump(name,1016) from chartest;

        ID
----------
DUMP(NAME,1016)
--------------------------------------------------------------------------------

         1
Typ=1 Len=15 CharacterSet=AL32UTF8: 31,32,33,e4,bd,a0,e5,a5,bd,e5,90,97,41,42,43

#‘123 你好吗ABC’在ZHS16GBK字符集下16进制代码为：31 32 33 C4 E3 BA C3 C2 F0 41 42 43，之所以跟Oracle存储的不同时因为客户端字符集（ZHS16GBK）与Oracle主字符集（AL32UTF8）不同，Oracle在底层发生字符集转换的原因。

 

 

H:\Users\LuoTaoyang>set NLS_LANG=American_America.AL32UTF8

 

 

SQL> select * from chartest;

 

        ID NAME

---------- --------------------

         1 123 浣�濂藉��ABC

 

# 出现乱码是因为此时Oracle客户端字符集与Oracle主字符集相同，Oracle不发生字符集转换。但在windows下依然用字符集（ZHS16GBK）显示。