How to manage Long field data Instead of Substr..............

Question

Hi,
I have one long column and need to check the existence of perticular key word in all records. So I used below
function. Sometimes the length is more than 4000 bytes so i want to check string from 4000 bytes to 8000 bytes etc . till end of the string . result of string Passing to the Sbstr function. Anbody can help me to read the long data column value above 4000 bytes to 8000 etc.
I tried like DBMS_SQL.COLUMN_VALUE_LONG(V_cursor,4000 , 8000, 3, l_buffer, l_buffer_len ); its returning null.???
FUNCTION Get_string(--)
Begin
DBMS_SQL.PARSE( V_cursor, V_Qry, dbms_sql.native );
DBMS_SQL.DEFINE_COLUMN_LONG(V_cursor, 1);
IF (DBMS_SQL.EXECUTE_AND_FETCH(V_cursor) > 0) THEN
DBMS_SQL.COLUMN_VALUE_LONG(V_cursor, 1 , 4000, 3, l_buffer, l_buffer_len );
IF L_Buffer IS NOT NULL THEN
L_Buffer := REPLACE(l_buffer, ' ', NULL);
END IF;
END IF;
DBMS_SQL.CLOSE_CURSOR(V_cursor);
RETURN l_buffer;
End;
Regards
Bijesh K

Answer 1

Knowing that TEXT column of all_views is of a LONG type, you can manage to query when doing sth like
SQL>  SELECT view_name
  FROM (SELECT view_name,
               EXTRACTVALUE (
                  dbms_xmlgen.getxmltype ('select text from all_views where owner = '''
                     || owner || ''' and view_name =''' || view_name || ''''), '//text()') text
          FROM all_views
         WHERE owner = 'SYS' AND ROWNUM <= 10)
WHERE LOWER (text) LIKE '%apply_database_link%'
VIEW_NAME                    
ALL_APPLY                    
ALL_APPLY_CONFLICT_COLUMNS   
ALL_APPLY_DML_HANDLERS       
ALL_APPLY_KEY_COLUMNS        
4 rows selected.Hope you get the idea ....