oracle 数据立方_关于在Oracle 数据库存储m³（立方米）

--------------注意：如下操作是在RHEL的VNC中执行的，并不是在secureCRT中执行的。------------

--------------原因:若是在secureCRT执行，m³会显示成：m鲁，见如下的截图,是啥原因我还没研究--

如下是实验的过程：

[[email protected] ~]$ export NLS_LANG=AMERICAN_AMERICA.AL32UTF8

[[email protected] ~]$ sqlplus scott/aaaaaa

SQL*Plus: Release 11.2.0.3.0 Production on Sat Jun 20 10:02:14 2015

Copyright (c) 1982, 2011, Oracle. All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> desc test_t1;

Name Null? Type

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

C1 VARCHAR2(20)

SQL> truncate table test_t1;

Table truncated.

SQL> insert into test_t1 values('m³');

1 row created.

SQL> commit;

Commit complete.

SQL> select * from test_t1;

C1

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

m³

SQL> select property_value from database_properties where property_name='NLS_CHARACTERSET';

PROPERTY_VALUE

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

AL32UTF8

SQL>

关于Oracle 数据库存储数学符号的描述，见如下的mos文章：

NEED TO STORE GREEK, MATH SYMBOLS (Doc ID 1060862.6)

下面全文转载该文章：

Problem Description:

====================

You would like to store extended Math symbols and the Greek letter Alpha in

the database because your business application requires the presence of those

symbols. You do not know which character set is on the database, but on the

application your NLS_LANG is set to NLS_LANG=American_America.we8iso8859p1 or

AMERICAN_AMERICA.WE8MSWIN1252.

Solution Summary:

=================

Your database was created with the wrong character set. Recreate the database

with the correct character set.

Choice of correct character sets:

EL8ISO8859P7

UTF8

Al32UTF8

Solution Description:

=====================

To find which character set is on the database level, connect internal or as

DBA and run the following query:

SVRMGR> select * from nls_database_parameters;

You probably do not have EL8ISO8859P7, UTF8 or the AL32UTF8 character set

listed for the NLS_CHARACTERSET parameter.

Other character sets do not contain Greek letters or extended Math symbols.

The character set that does is EL8ISO8859P7 or a UNICODE as character set, see:

Note:260893.1 Unicode character sets in the Oracle database

Solution Explanation:

=====================

All character data in an Oracle database is stored using a single character

encoding scheme (character set). The database encoding scheme does not have

to be the same as that used by an application to access database data.

Although, the character set on the database level determines the choice of

characters that can be stored. The database character encoding scheme is

specified when the database is created, before it contains any data, by the

CREATE DATABASE statement. The client-side encoding scheme is specified by

defining the NLS_LANG parameter for a session. Once CREATE'd, a database

encoding scheme cannot be changed without re-creating the database.