PLS-00302: component 'M' must be declared in oracle 11g [duplicate] - oracle

Question

This question already has answers here:
Accessing elements of Oracle PLSQL record type on runtime
(3 answers)
Closed 6 months ago.
I want to convert table type data into single variable with ',' separated
also I dont know what column used in table type. please let us know how to achieve it without passing column name, output must be string type.
DECLARE
TEST_TAB ADT.TEST_TABB2 := ADT.TEST_TABB2(adt.test_obj(2,
'dsd'),
adt.test_obj(3,
'agg'));
l_name clob := '';
CURSOR c IS
SELECT
ATTR_NAME
FROM
ALL_TYPE_ATTRS
WHERE
OWNER = 'ADT'
AND TYPE_NAME = (
SELECT
REFERENCED_NAME
FROM
DBA_DEPENDENCIES
WHERE
REFERENCED_OWNER = 'ADT'
AND NAME = 'TEST_TABB2'
AND REFERENCED_TYPE = 'TYPE');
t nvarchar2(500) := '';
BEGIN
FOR i IN TEST_TAB.FIRST .. TEST_TAB.LAST
LOOP
l_name := l_name || '(';
FOR cur IN c LOOP
t := cur.ATTR_NAME;
dbms_output.put_line(t);
l_name := l_name || ' ' || t ;
l_name := l_name || ', ' || TEST_TAB(i).t;
END LOOP;
l_name := l_name || ')' ;
END LOOP;
dbms_output.put_line(l_name);
END;

Answer 1

You could use dynamic SQL, concatenating in the attribute name, and passing the object as a bind variable:
...
BEGIN
FOR i IN TEST_TAB.FIRST .. TEST_TAB.last LOOP
FOR cur IN c LOOP
m := '.' || cur.ATTR_NAME;
execute immediate 'select :o' || m || ' from dual'
into t
using test_tab(i);
dbms_output.put_line(t);
END LOOP;
END LOOP;
END;
or
...
BEGIN
FOR i IN TEST_TAB.FIRST .. TEST_TAB.last LOOP
FOR cur IN c LOOP
execute immediate 'select :o.' || cur.ATTR_NAME || ' from dual'
into t
using test_tab(i);
dbms_output.put_line(t);
END LOOP;
END LOOP;
END;
which both produce output;
2
John
3
Devid
db<>fiddle
The first block above doesn't work in the unpatched version of 11gR2 available in db<>fiddle, but I'm not quite sure why, or whether it would work in a later, patched, version. The second block does work though.