cx_Oracle and unicode data

GHUM haraldarminmassa at
Thu Mar 15 13:48:20 CET 2007

loo ping,

> But it's not what I call a 'clean' solution and I suppose that it must
> exist another way to force the client DB to use UTF8, or another
> solution to get my data.

I share your feeling. I asked a similiar question ~1 year ago; and:
your solution is the only one.

The oracle-libs get their encoding from the environment. I also
learned that it often is helpfull to first set the environment and
THEN import cx_Oracle (which loads the oci.dll)

> import os
> os.environ["NLS_LANG"] = ".UTF8"
> import cx_Oracle

> cur.execute("select DESCRIPTION from DEC_DESCRIPTION where
> DEC_DESCRIPTION_ID = 1792528")

Additionally: UTF8 has different numbers of bytes per character. Your
select will only succeed for the time that DESCRIPTION encoded in UTF8
is shorter or equal to length(DESCRIPTION)

I got into the habbit to cast those fields to
NVARCHAR2(as big as I think it may get)


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