BLOB data into varchar2

Question

Hi All,
Can someone please help me in converting BLOB data into varchar2 or long .
we have function which convert long data and return it has varchar . But has part of Apps upgrade the Column has been converted into blob column.
Edited by: user10310673 on Feb 12, 2013 6:56 AM

Answer 1

Hi BluShadow,
This is how i am trying to read the data from BLOB and store it has varchar2 , but my function is not returning any value.. not sure where I am making the mistake ,
but i can see the data in dbms_output.put_line
create or replace function test_alert_msg(v_rowid rowid) return varchar2 is
vblob BLOB;
data_buffer RAW (1);
temp_buffer VARCHAR2(1);
temp_buffer1 varchar2(4000);
amount BINARY_INTEGER := 1;
position INTEGER := 1;
length_count INTEGER;
BEGIN
dbms_output.put_line('Start Time: ' || to_char(sysdate,'DD-MON-RR HH24:MI:SS'));
-- select blob into variable
SELECT GDTXFT
INTO vblob
from jdedta.f00165 m
where rowid = v_rowid;
-- get length of blob
length_count := dbms_lob.getlength(vblob);
dbms_output.put_line('Internal LOB size is: ' || length_count);
WHILE length_count <> 0 LOOP
dbms_lob.read (vblob, amount, position, data_buffer);
temp_buffer := utl_raw.cast_to_varchar2(data_buffer);
temp_buffer1 := temp_buffer1||temp_buffer;
position := position + 1;
length_count := length_count - 1;
data_buffer := null;
END LOOP;
dbms_output.put_line(temp_buffer1);
return(temp_buffer1);
end test_alert_msg;
Output
Start Time: 12-FEB-13 09:21:34
Internal LOB size is: 512
[ O n e W o r l d . A p p l i c a t i o n ]
I s M e n u = 0
A p p l i c a t i o n = P 0 3 B 3 1
F o r m = W 0 3 B 3 1 A
i d F o r m = W 0 3 B 3 1 A
D a t a F o r m a t = 1 | W 0 3 B 3 1 A | 1 | 2 | 3
D a t a = 5 0 6 5 4 3 2 | 3 0 | 0 1 0 0 0