Convert long to varchar2

Hi there,
I am looking for a convertion, long to varchar2, in a sql statement.
If I run the following query :
select data_default from user_tab_columns
It works fine in sql developper but when I execute it in my PHP code it returns:
Notice: Undefined index: DATA_DEFAULT in /opt/lampp/htdocs/datamodel/index.php on line 64
This issue is due in the case where the columns has null.
So I try with the NVL function:
select nvl(data_default, 'null') from user_tab_columns
ORA-00932: inconsistent datatypes: expected LONG got CHAR
I found on internet some people are using the substr function but it did not working for me.
select substr(data_default, 1, 2000) from user_tab_columns
ORA-00932: inconsistent datatypes: expected NUMBER got LONG
Any one has an idea ?
Regards !

See this thread as well you can get an exaple user function
ORA-00932: inconsistent datatypes
G.

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PL/SQL Solution for Converting Long to VarChar2

I recently had to convert a bunch of text stored in Long fields to a new VarChar2(2000) field in the same table.
As you know if you've ever tried, you can't use a basic SQL the update statement will not do this, e.g. update table1 set field2 = field1 (where field2 is VarChar(2000) and field1 is Long) fails as does update table1 set field2 = substr(field1, 1, 2000).
Interestingly PL/SQL's implementation of SubStr does work with Long fields. I was able to put together the following anonymous PL./SQL block to accomplish the task (msgtext is varchar(2000), msgtext2 is Long):
DECLARE
CURSOR message_cur
IS
SELECT ROWID, msgtext, msgtext2
FROM tlrcmmessages
FOR UPDATE;
message_rec message_cur%ROWTYPE;
BEGIN
OPEN message_cur;
LOOP
FETCH message_cur
INTO message_rec;
EXIT WHEN message_cur%NOTFOUND;
UPDATE tlrcmmessages
SET msgtext = SUBSTR(message_rec.msgtext2, 1, 2000)
WHERE CURRENT OF message_cur;
END LOOP;
CLOSE message_cur;
END;
I hopes this helps others out there in similar circumstances.
Good luck,
Rob Bratton, Bratton Enterprises

Oracle strongly recommends to convert LONG fields into CLOB:
http://download-west.oracle.com/docs/cd/B10501_01/appdev.920/a96590/adfnstyp.htm#429091
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Hi ,
I have to retrive the CLOB data into varchar2 and spilt those comma seperated values into rows
but i am getting following error
" ORA-06502: PL/SQL: numeric or value error: character string buffer too small "
the proc i used is like following :
: create table test_clob (grp_id CLOB, id number)
Create or replace proc test_clob(p_id number )
Is
V_clob CLOB;
V_str varchar2(4000);
V_main varchar2(30000);
TYPE t_clob IS REF CURSOR;
cur_clob t_clob;
Begin
Select grp_id
Into v_str
From test_clob
Where id= p_id;
---converting column data in rows as I have to return the cursor as output
V_main:= ' select grp_id from ( WITH t AS
(SELECT REGEXP_SUBSTR(''' || v_str ||
''', ''[^,]+'', 1, LEVEL) txt
FROM DUAL
CONNECT BY LEVEL <=
LENGTH(''' || v_str ||
LENGTH(REPLACE(''' || v_str ||
''', '','')) + 1)
SELECT REGEXP_SUBSTR(trim(txt), ''[^\,]+'', 1, 1) grp_id
FROM t )';
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from ( '|| v_main||' ) ';
loop
fetch cur_clob
into V_clob;
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Please help its very urgent

957624 wrote:
Hi ,
I have to retrive the CLOB data into varchar2 and spilt those comma seperated values into rows
but i am getting following error
" ORA-06502: PL/SQL: numeric or value error: character string buffer too small "
the proc i used is like following :
: create table test_clob (grp_id CLOB, id number)
Create or replace proc test_clob(p_id number )
Is
V_clob CLOB;
V_str varchar2(4000);
V_main varchar2(30000);
TYPE t_clob IS REF CURSOR;
cur_clob t_clob;
Begin
Select grp_id
Into v_str
From test_clob
Where id= p_id;
---converting column data in rows as I have to return the cursor as output
V_main:= ' select grp_id from ( WITH t AS
(SELECT REGEXP_SUBSTR(''' || v_str ||
''', ''[^,]+'', 1, LEVEL) txt
FROM DUAL
CONNECT BY LEVEL <=
LENGTH(''' || v_str ||
LENGTH(REPLACE(''' || v_str ||
''', '','')) + 1)
SELECT REGEXP_SUBSTR(trim(txt), ''[^\,]+'', 1, 1) grp_id
FROM t )';
open cur_clob for ' select rtrim(xmlagg(xmlelement(e, grp_id || '','')).extract (''//text()'').getclobval (),'','') grp_id
from ( '|| v_main||' ) ';
loop
fetch cur_clob
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exit when cur_clob %notfound;
end loop;
insert into test_clob
values (p_id, v_clob);
commit;
End;
Please help its very urgentNo, nothing is urgent here and it is very rude to suggest it is, as well as it being a breach of the terms of use for the forums. Urgent issues relate to commercially live systems, and for those you need to raise a support request with Oracle Support. The forums are manned by volunteers with their own jobs to do, so suggesting they drop everything to help you urgently is very rude. Also, other people asking questions would like answers to theirs as soon as possible too, so suggesting your question is more urgent than theirs is also rude to those people. You will find that suggesting your question is urgent will actually prevent people from helping you on the forums as many people will simply choose to ignore you for your rudeness (either that or they'll be rude back)
Please read {message:id=9360002} to learn how to ask a question properly.
Now, in answer to your question...
What is it you are really trying to do?
If you have comma seperated data, why it is being stored like that in a CLOB? That seems like bad design for storing data.
If the data is coming from a file, then you could consider using External Tables (or SQL*Loader) to load the comma seperated data in a structured way.
If you really have data in a clob in comma seperated format, what are you wanting to do with it exactly i.e. what determines where the data should be split?
Your code isn't clear, but it looks like, on the one hand you are splitting comma seperated data out of a string, and on the other hand you're turning it into XML to get a clob of data back.
Please be clear by providing some example data and expected output, along with your database version as explained in the FAQ post I linked to above.

Convert NVARCHAR2 to VARCHAR2 in select statement

I need to convert NVARCHAR2 values to VARCHAR2 in a select statement. Is this possible? The COUNTY_PARCEL_DATA colums are the NVARCHAR2 columns that need converting. I've tried TRANSLATE(COUNTY_PARCEL_DATA.SITUS_STREET_NUMBER USING CHAR_CS), CAST(COUNTY_PARCEL_DATA.SITUS_STREET_NUMBER AS VARCHAR2(100)), CONVERTCS(COUNTY_PARCEL_DATA.SITUS_STREET_NUMBER, 'CHAR_CS') and others directly in the statement for each column. Anything I'm missing? Thanks.
SELECT BENEFICIARY.NAME_FIRST || ' ' || BENEFICIARY.NAME_LAST AS NAME,
COUNTY_PARCEL_DATA.SITUS_STREET_NUMBER
|| ' '
|| COUNTY_PARCEL_DATA.SITUS_STREET_DIRECTION
|| ' '
|| COUNTY_PARCEL_DATA.SITUS_STREET_NAME
|| ' '
|| COUNTY_PARCEL_DATA.SITUS_STREET_TYPE
AS ADDRESS,
COUNTY_PARCEL_DATA.SITUS_CITY AS CITY,
'AZ' AS STATE,
COUNTY_PARCEL_DATA.SITUS_ZIP AS ZIP,
'T4' AS TRACER
FROM BENEFICIARY
LEFT OUTER JOIN
VARS_PARCEL
ON BENEFICIARY.AVNUM = VARS_PARCEL.AVNUM
LEFT OUTER JOIN
COUNTY_PARCEL_DATA
ON VARS_PARCEL.APN = COUNTY_PARCEL_DATA.APN
LEFT OUTER JOIN
OWNER
ON BENEFICIARY.BENEFICIARY_ID = OWNER.BENEFICIARY_ID
WHERE (SUBSTR (VARS_PARCEL.AVNUM, 0, 4) IN
(SELECT COLUMN_VALUE
FROM TABLE(SPLIT_STRING (
R_VARS_MAILING_NOTICES.NEIGHBORHOODS
OR R_VARS_MAILING_NOTICES.NEIGHBORHOODS IS NULL)
AND BENEFICIARY.BENEFICIARY_TYPE = 'Tenant';
Edited by: Guddie on Apr 6, 2010 12:23 PM

Are you doing the NVARCHAR2 to VARCHAR2 conversions everywhere, see comments below
SELECT BENEFICIARY.NAME_FIRST || ' ' || BENEFICIARY.NAME_LAST AS NAME,
COUNTY_PARCEL_DATA.SITUS_STREET_NUMBER                        <==== Here, obviously
|| ' '
|| COUNTY_PARCEL_DATA.SITUS_STREET_DIRECTION                <==== Here
|| ' '
|| COUNTY_PARCEL_DATA.SITUS_STREET_NAME                        <==== Here
|| ' '
|| COUNTY_PARCEL_DATA.SITUS_STREET_TYPE                        <==== Here
AS ADDRESS,
COUNTY_PARCEL_DATA.SITUS_CITY AS CITY,                            <==== Here
'AZ' AS STATE,
COUNTY_PARCEL_DATA.SITUS_ZIP AS ZIP,                                 <==== Here
'T4' AS TRACER
FROM BENEFICIARY
LEFT OUTER JOIN
VARS_PARCEL
ON BENEFICIARY.AVNUM = VARS_PARCEL.AVNUM
LEFT OUTER JOIN
COUNTY_PARCEL_DATA
ON VARS_PARCEL.APN = COUNTY_PARCEL_DATA.APN                   <==== Here, maybe not so obvious
LEFT OUTER JOIN
OWNER
ON BENEFICIARY.BENEFICIARY_ID = OWNER.BENEFICIARY_ID
WHERE (SUBSTR (VARS_PARCEL.AVNUM, 0, 4) IN
(SELECT COLUMN_VALUE
FROM TABLE(SPLIT_STRING (
R_VARS_MAILING_NOTICES.NEIGHBORHOODS
OR R_VARS_MAILING_NOTICES.NEIGHBORHOODS IS NULL)
AND BENEFICIARY.BENEFICIARY_TYPE = 'Tenant';This is assuming that all fields in COUNTY_PARCEL_DATA are NVARCHAR2.
Edited by: AlanWms on Apr 6, 2010 3:53 PM changed "joins" to "conversions" in 1st sentence.

HELP! - Converting LONG to CLOB in PL/SQL

can i pass in a LONG as a parameter to a stored procedure and in
the stored procedure convert or assign it to a CLOB column? i
have tried passing in a CLOB as an input parameter using OO4O
without any success. i am using the oracle oledb provider
currently but may convert it over to using OO4O if i have to. i
know i can pass in a LONG via ADO as an adLongVarChar datatype,
but i am not sure what to do with the LONG inside the stored
procedure. if anyone knows how to get a LONG into a CLOB could
you please post some very basic sample PL/SQL code.
if there is an easier way please let me know!
the reason i am using CLOB's is because i need more than one
LONG in certain tables, and you can only have 1 LONG per table.
thanks

i should have mentioned i am using oracle 8.1.7.2.1 and when i
try to use TO_LOB() i get "Identifier TO_LOB must be declared."
so i am assuming this is an oracle 9 function. is this correct?

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