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NLS_LANG setting on SQLPLUS

Posted on 2013-11-01
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Last Modified: 2013-12-13
I am trying to set NLS_LANG setting to POLISH_POLAND.EE8PC852 in a batch file. The batch file further executes sql files as under

set NLS_LANG=POLISH_POLAND.EE8PC852
sqlplus username/password@sid @SetLang.sql

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SetLang.sql updates some tables in my database. When I call this bat file the special characters do not get updated in my database but when I execute the same sql from sqldeveloper they get updated.

Where am I going wrong?
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Question by:jim_imtech
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by:Greg Clough
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What format is the SetLang.sql file in?  I'm presuming that your database is in EE8PC852 character set, but is the SQL file in the same format... or is it in UTF-8?

Remember, you need to set the NLS_LANG to match the "client", not the "database".

Alternatively, it appears you're using csh.  Have you tried using "setenv"?

setenv NLS_LANG=POLISH_POLAND.EE8PC852

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If you could give a dump of the SQL file (using "od"), and of the database rows (using "dump(YOUR_COLUMN_HERE,1016)") that would be helpful.
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by:jim_imtech
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My sql file has simple update statements

update TBLDETECTOR_TYPEID set typedescription = 'Predkosc' where typedescription = 'Speed';

commit;

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Please note the special characters in 'Predkosc' are removed....

The database column shows Pr¦Ödko+T¦ç
Using setenv  has the same result
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by:jim_imtech
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You are right. My sql file is in UTF-8. Is that the issue? How can I save it in EE8PC852 using notepad or Notepad++?
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by:Greg Clough
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If you set your NLS_LANG thus:

set NLS_LANG=POLISH_POLAND.AL32UTF8

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Then Oracle will know that the file you are loading is UTF-8, and convert it to whatever character set the database is using... in this case EE8PC852.  There is a very common misconception that you need to set your NLS_LANG to match your database, but that is dangerously wrong.  Always set your NLS_LANG to match the client that's connecting to the database and let the magic of TNS character set translation sort the conversion for you.

If the character set of your client is set to match your database, then Oracle presumes there is no character translation required and loads whatever you feed it directly into the database... thus you're getting UTF-8 data in your database, but when it's read back the database is presuming it's EE8PC852.  This type of corruption is difficult if not impossible to reverse.

NOTE: I'm presuming you're on v10 or v11 of Oracle as their UTF-8 character set is AL32UTF8, as otherwise if you're on v9 or earlier then I'll have to google to remember what it was.
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by:jim_imtech
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I am running this script from SQLPLus and looking at the link http://docs.oracle.com/html/B10546_01/gblsupp.htm there is no setting of AL32UTF8 for Dos.

I still tried it but I get SP2-0734 error. Basically sqlplus finds junk characters around my sql. Any suggestions?

I am using Oracle 11.2
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Greg Clough earned 500 total points
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That URL points to a v9.2 document, and I believe that the availability of Windows Codepages has moved on quite a lot on Windows since those days.

As far as I'm aware, even if your version of Windows doesn't support UTF-8, so long as the file is actually encoded in UTF-8 and you have your NLS_LANG set correctly, then Oracle will read and process the file as a UTF-8 file and do character set translation so that it gets inserted into your database correctly.

Again, not being a windows guy I can only suggest that you follow the advice from here:

http://www.orafaq.com/wiki/NLS_LANG

Which basically says to run the "set" command in your CMD window prior to starting sqlplus.  It should be able to make this persistent by setting the Registry Key to the correct value.  You should search for "NLS_LANG" underneath:

HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE
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