Exception - If table is Invalid

Question

Hi All,
I have following procedure... what exceptions should be used if the table name which i am passing is invalid.
Can i give INVALID_CURSOR?????
Specification
Used table type...
   TYPE t_tab IS TABLE OF VARCHAR2 (4000);
  PROCEDURE PROCESS (
      pv_tab     IN       t_tab
   IS
      --This cursor will fetch all the high_value,high_value_length,partition_name available for the tables which is passed for purging
      CURSOR c_dba_tab_part (lv_multi_tab IN VARCHAR2)
      IS
         SELECT dtp.high_value, dtp.partition_name
           FROM dba_tab_partitions dtp
          WHERE dtp.table_name = lv_multi_tab
      --Local variable which holds the cursor parameters value
      lv_part_name         dba_tab_partitions.partition_name%TYPE;
      lv_long_high_val     LONG;
   BEGIN
      FOR i IN 1 .. pv_tab.COUNT
      LOOP
         --Opening the cursor for processing
         OPEN c_dba_tab_part (pv_multi_tab (i));
         LOOP
            FETCH c_dba_tab_part
            INTO lv_long_high_val, lv_part_name;
               EXIT WHEN c_dba_tab_part%NOTFOUND;
   EXCEPTION
      WHEN OTHERS
      THEN
         -- During processing or any abrupt actions; if the cursor is still open, then close the cursor.
         IF c_dba_tab_part%ISOPEN
         THEN
            CLOSE c_dba_tab_part;
         END IF;
         DBMS_OUTPUT.put_line
            (   'Exception Raised in Package Procedure PROCESS --> SQLCODE-->'
             || SQLCODE
             || 'SQLERRM-->'
             || SQLERRM
         RAISE;
   END PROCESS;  
   Please help....
Thanks....

Answer 1

In this explicit CURSOR will not generate an exception like NO_DATA_FOUND. You have to use cursor attributes. This long example may help you!
SQL> CREATE TYPE t_tab IS TABLE OF VARCHAR2 (4000);
  2  /
Type created.
SQL> show error
No errors.
SQL> CREATE OR REPLACE PROCEDURE PROCESS(pv_tab IN t_tab) IS
  2    --This cursor will fetch all the high_value,high_value_length,partition_name available for the tables which is passed
  3    CURSOR c_dba_tab_part(lv_multi_tab IN VARCHAR2) IS
  4      SELECT dtp.column_name
  5        FROM user_tab_cols dtp --I changed the table name for simpicity.
  6       WHERE dtp.table_name = lv_multi_tab;
  7 
  8    --Local variable which holds the cursor parameters value
  9    TYPE tbl_typ IS TABLE OF user_tab_cols.column_name%TYPE;
10    lv_part_name     tbl_typ; --Changed this for simplicity
11    lv_long_high_val LONG;
12    v_tbl            PLS_INTEGER;
13  BEGIN
14 
15    FOR i IN 1 .. pv_tab.COUNT LOOP
16      --Opening the cursor for processing
17      OPEN c_dba_tab_part(pv_tab(i));
18      FETCH c_dba_tab_part BULK COLLECT
19        INTO lv_part_name;
20      v_tbl := c_dba_tab_part%ROWCOUNT;
21      IF v_tbl = 0 THEN
22        dbms_output.put_line('This is invalid table:' || pv_tab(i));
23      ELSE
24        dbms_output.put_line('The columns for:' || pv_tab(i) || ' are: ');
25        FOR j in 1 .. lv_part_name.COUNT LOOP
26          dbms_output.put_line(lv_part_name(j));
27        END LOOP;
28      END IF;
29      CLOSE c_dba_tab_part;
30    END LOOP;
31 
32  EXCEPTION
33    WHEN OTHERS THEN
34      -- During processing or any abrupt actions; if the cursor is still open, then close the cursor.
35      IF c_dba_tab_part%ISOPEN THEN
36        CLOSE c_dba_tab_part;
37      END IF;
38   
39      DBMS_OUTPUT.put_line('Exception Raised in Package Procedure PROCESS --> SQLCODE-->' ||
40                           SQLCODE || 'SQLERRM-->' || SQLERRM);
41      RAISE;
42  END PROCESS;
43  /
Procedure created.
SQL>
SQL> BEGIN
  2  PROCESS (t_tab('EMP','DEPT','TABLE_3'));
  3  END;
  4  /
The columns for:EMP are:
EMPNO
ENAME
JOB
MGR
HIREDATE
SAL
COMM
DEPTNO
The columns for:DEPT are:
DEPTNO
DNAME
LOC
This is invalid table:TABLE_3
PL/SQL procedure successfully completed.
SQL>