问题
I am trying to insert Arabic characters in Oracle 11g, however the data is being inserted as question marks. I searched around and it seems i have to change the character encoding... But i am not sure how, and whether will it affect my database. Any help please ?
UPDATE LAM_INVESTMENT
SET INVESTMENT='ل'
WHERE KEY=11;
I tried updating from within SQL developer, also same outcome.
回答1:
First of all check if your database is capable to store Arabic characters by
SELECT *
from NLS_DATABASE_PARAMETERS
WHERE PARAMETER IN ('NLS_CHARACTERSET', 'NLS_NCHAR_CHARACTERSET');
If you get values like AL32UTF8, AL16UTF16 or WE8ISO8859P6 you are fine and DB is able to store such characters.
In SQL Developer go to Tools / Preferences / Environment / Encoding and select UTF-8.
Set an Environment Variable to NLS_LANG=ARABIC_AMERICA.AL32UTF8 or similar, you can also do NLS_LANG=.AL32UTF8 in order to keep default/existing language and territory. Alternatively you can set is also in your Registry at HKLM\SOFTWARE\Wow6432Node\ORACLE\KEY_%ORACLE_HOME_NAME%\NLS_LANG (for 32 bit), resp. HKLM\SOFTWARE\ORACLE\KEY_%ORACLE_HOME_NAME%\NLS_LANG (for 64 bit).
Then it should work.
Changing your local character set (i.e. NLS_LANG) does never affect any existing data in database.
回答2:
You can try updating using the function UNISTR and the unicode 0644, to circumvent Oracle client configurations (in case they do not support Unicode):
UPDATE LAM_INVESTMENT
SET INVESTMENT=UNISTR('\0644')
WHERE KEY=11;
It may or may not work, depending on the data type of column investment and on your character set (or national character set).
Unicode table reference
回答3:
If you column type is nvarchar, have you tried to use the next query:
UPDATE LAM_INVESTMENT
SET INVESTMENT=N'ل'
WHERE KEY=11;
I had the same situation with korean language. Hope this approach helps you as well as it helped me.
来源：https://stackoverflow.com/questions/34188292/inserting-arabic-characters-in-oracle-11g