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Re: Informix 12 Unicode

Posted By: Martin Fuerderer
Date: Wednesday, 22 October 2014, at 3:56 a.m.

In Response To: Re: Informix 12 Unicode (MATTI JAATINEN)

Hi,

Disclaimer: I have to admit that I did not really
follow this discussion. Therefore the following
suggestion may be neither new nor applicable.

If you need to know the length in characters of
an individual value, you may use a function called
CHAR_LENGTH. Excerpt from the SQL Syntax
Guide:

CHAR_LENGTH Function

The CHAR_LENGTH function returns the number
of logical characters in its argument, which can
be a character column, a character variable, or
a quoted string. This built-in function can also
be invoked as CHARACTER_LENGTH.

In the default U.S. English locale and other
single-byte locales, CHAR_LENGTH behaves
exactly like the LENGTH function, and returns
the number of bytes in its argument.

For multibyte code sets, however, which
various Unicode, East Asian, and other
nondefault locales support, the return value
can be less than the number of bytes in the
argument. For a discussion of this function,
see the IBM Informix GLS User's Guide.

Regards,
Martin
--
Martin Fuerderer
IBM Informix Development Munich, Germany
Information Management

Read about the Informix Warehouse Accelerator:
http://tinyurl.com/the-iwa-blog

IBM Deutschland Research & Development GmbH
Chairman of the Supervisory Board: Martina Koederitz
Board of Management: Dirk Wittkopp
Corporate Seat: Boeblingen, Germany
Reg.-Gericht: Amtsgericht Stuttgart, HRB 243294

From: "MATTI JAATINEN" <matti.jaatinen@norelco.fi>
To: ids@iiug.org
Date: 10/22/2014 07:51
Subject: Re: Informix 12 Unicode [34010]
Sent by: ids-bounces@iiug.org

Hi,

"But It's not clear to me
what are the real requirements and complains..."

It is just that i am bit frustrated pecause i
did research and tested informix and did not find way to make informix
report
logical character length and
now i know it's impossible. So im bit of relieved but.... no good.

1)
Yes, i tested bit further SQL_LOGICAL_CHAR and it did not resolve the
problem.
Example SQL_LOGICAL_CHAR is 3 make query "select 'test' AS test,* from
eka;"
We have no clue what is the length of column test.
SQL_LOGICAL_CHAR is useless in my case.

2)
We have kind of RAD(Rapid Application Development)-tool which we use to
develop GUIs;
the tool gets field length from prepared SQL-statements. This information
can
be
used to prevent user from flooding the data. The tool uses logical
character
length, not the
character byte size.

3)
Not understood the question.

4)
If the informix could report the logical character length, the program
could
notify the user that there is no enough space for what he's putting into
program.

5)
Our idea was that we could put the cyrillic texts in our database, every
single character
is at leat 2-bytes, then the chinese 3-bytes. This means that programmer
have to manually control how many characters he allows to put into field.
Again
this is more work for him.

So Informix canno't produce the information about logical character
length.
This is the information which i came here to ask, pecause i did myself try
to
find way to make informix report
actual logical character length but now i know iformix canno't do it.

*******************************************************************************

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