VARCHAR2: 8 k limit when you use a multibyte character set

Hi people,
Apex 3.1.2 on 10.2.0.4 RAC on linux; the character set standard for my organization is AL32UTF8.
The apex database contains all non-US7ASCII character.

In a part of the URL, I just came from a package XML strings that are concatenated and passed as a parameter to Anychart.swf. Once my concatenated string exceeds 8 k I get "ORA-06502: PL/SQL: digital error or value." This is because on a UTF8 database are reserved to 4 bytes for each character; whether coded on several bytes, or not - and the varchar2 (32767) is exhausted.

It is a severe limitation as the XML table can easily exceed 8 k.

What choices do I have?
-If I change my database in US7ASCII he works my limit for the concatenation in a region with a real 32,767 characters? Better, but still limited.
-are there functions to force a single byte per character conversion - I don't think so, but just in case where...
-would spend using CLOB? I'm worried it might slow down processing low-response time is one of the main motivations for going to the whole problem in the first place.

My code looks like this:

DECLARE
Xml1 VARCHAR2 (4000);
xml2 VARCHAR2 (4000);
XML3 VARCHAR2 (4000);
xml4 VARCHAR2 (4000);
str1 VARCHAR2 (32767).

pkg_chart. Gen_Chart_Xml5
(p_chart = >...)
, p_Location = >...
, p_timescale = >...
, p_Day = >...
, p_RETURN1 = > xml1
, p_RETURN2 = > xml2
, p_RETURN3 = > xml3
, p_RETURN4 = > xml4
);
str1: = xml1. xml2 | XML3 | xml4;

.. .and later
var Chart1 = new AnyChart();
Chart1.SetData ("' | str1 |) ''');
Chart1.write ("chartDiv-1");

Right now my code fails in concatenation in str1 if the total length is more than about 8 k.
I've seen different messages about CLOB handling in the apex and it seems to be fraught with problems too: so I was wondering if anyone has any advice on how to best proceed. or could you show me an example to do something like this using CLOB instead.

Thank you very much!
Mark

Published by: Mark Teehan on October 12, 2009 02:22

Hello

I was about to hit you up an example when I spotted a recent blog post of someone I know called Morten Jensen.

His blog is here [http://theworldofjensenmo.blogspot.com/] and here is the relevant quote...

>
He must be a procedure which will be "buffer printing" CLOB. The procedure to come htp.prn with the PL/SQL Web Toolkit in the Oracle database allow up to 8192 characters to print at a time, which is too few in my case. So this function below will share a CLOB up to 256 character fragments and htp.prn them one at a time.

create or replace PROCEDURE HTP_BUF_PRN
(p_text IN CLOB
) AS
l_buflen INTEGER: = 256;
BEGIN

FOR i FROM 0... Floor (length (p_text) / l_buflen) LOOP
-HTP. PRN will not accept lines up to 8192 characters - that's why this function is required
HTP. PRN (substr (p_text, i * l_buflen + 1, l_buflen));
END LOOP;

-htp.prn (substr (p_text, LENGTH (p_text) - (LENGTH (p_text) mod l_buflen), LENGTH (p_text) mod l_buflen));

END HTP_BUF_PRN;
>

He hit me with that feeling of "why didn't I think that!

I hope this helps.

See you soon

Ben

Tags: Database

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