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IDS Forum

Re: error while converting from en_us to utf8

Posted By: Jonathan Leffler
Date: Thursday, 24 March 2011, at 12:36 a.m.

In Response To: Re: error while converting from en_us to utf8 (Debadatta Mishra)

On Wed, Mar 23, 2011 at 04:06, Debadatta Mishra <mishra.dd@gmail.com> wrote:

> I set the same client_locale as db_locale.
> version is 11.5
> character in data files are mostly ascii charcters
>

As others have noted, your problem then comes from the implied claim that
all the 8859-1 data is in fact encoded as valid UTF8. For characters in the
range 0x00..0x7F (or U+0000..U+007F), there is no problem. For characters
from the 8859-1 range 0x80..0xFF, the value is not a simple valid UTF8
encoding and you will end up with errors. UTF8 does not allow character
codes 0xC0, 0xC1, 0xF5..0xFF at all, for example, and requires certain
sequences of characters (a byte in the range 0xC2..0xDF must be followed by
one byte in the range 0x80..0xBF, for example) which random 8859-1 data is
unlikely to satisfy. (This is fundamentally the point I raised in my
original response.)

You could arrange to map the 8859-1 to UTF8 characters; I have a program
sbcs2utf8 that could be used to convert any single-byte code set (SBCS) to
UTF8 (given an appropriate mapping file), and there are plenty of other
(better) programs to do the same job.

Alternatively, you can do the import with CLIENT_LOCALE=en_us.8859-1 and
DB_LOCALE=en_us.utf8. Then GLS does the codeset conversion automatically.

[Tested on MacOS X 10.6.7 with IDS 11.70.FC1. Database created with local
en_us.8859-1; table contained single VARCHAR(255) field; data with one byte
for each of 0x80..0xFF loaded into table. Database exported; export hacked
to change DB name (from iso8859_1) to utf8. Database imported with
environment as suggested; data selected is demonstrably UTF8 when the
CLIENT_LOCALE is set to en_us.utf8. And the last character, LATIN SMALL
LETTER Y WITH DIAERESIS (ÿ) was truncated because the VARCHAR(255) can only
hold 127 2-byte characters.]

> On Wed, Mar 23, 2011 at 2:37 PM, Jonathan Leffler wrote:
> > On Wed, Mar 23, 2011 at 00:58, Debadatta Mishra wrote:
> > > I am getting error while importing from en_US.819 to en_us.utf8.
> > > while doing a dbimport i am getting data is corrupt message and unknown
> > > error.
> > >
> > > but when i removed the data file it got imported. The tables only
> > > contained char, varchar ,date fields.
> > >
> > > is there any specific reason why it should fail like this.
> > >
> > > Also the import was very very slow on procedures
> >
> > Various questions arise, such as:
> > * Version and platform?
> > * Setting of CLIENT_LOCALE?
> > * What characters appeared in the data file from the range 0x80..0xFF?
>

--
Jonathan Leffler <jonathan.leffler@gmail.com> #include <disclaimer.h>
Guardian of DBD::Informix - v2008.0513 - http://dbi.perl.org
"Blessed are we who can laugh at ourselves, for we shall never cease to be
amused."

--00151747be16a4afd5049f32f1de

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