Please explain this part of the code

CREATE OR REPLACE PROCEDURE IS abc123
-Statements
v_T_MAP_record T_MAP_map % ROWTYPE;

TYPE t_element_cursor IS REF CURSOR;
v_T_MAP_cursor t_element_cursor;

number of v_T_MAP_count;
BEGIN
DBMS_OUTPUT. ENABLE (1000000);
v_T_MAP_cursor: = get_T_MAPs (1308); -This will get the record of the cursor

-Open the cursor
EXTRACTION v_T_MAP_cursor
IN v_T_MAP_record;

V_T_MAP_cursor % FOUND LOOP

dbms_output.put_line ('uc.use_case_id: ' | v_T_MAP_record.use_case_id);

v_T_MAP_count: = v_T_MAP_count + 1;

EXTRACTION v_T_MAP_cursor
IN v_T_MAP_record;

END LOOP;

-Close the cursor
CLOSE V_T_MAP_cursor;

EXCEPTION
While OTHERS THEN
dbms_output.put_line ('Error' |) TO_CHAR (SQLCODE) | ': ' || SQLERRM);
END;

I do not understand why we are having 2 game instruction Fetch IN v_T_MAP_record's first before the while loop v_T_MAP_cursor and the other inside the v_T_MAP_cursor. Please explain. If I remove the second instruction fetch inside the loop, it gives me a buffer overflow error.

It's what he does...

CREATE OR REPLACE PROCEDURE abc123  IS
    --Variable declarations
    v_T_MAP_record T_MAP_map%ROWTYPE;

    TYPE t_element_cursor IS REF CURSOR;
    v_T_MAP_cursor t_element_cursor;

    v_T_MAP_count number;
  BEGIN
    DBMS_OUTPUT.ENABLE(1000000);  -- THIS ISN'T REALLY NEEDED

    -- This opens the ref cursor, it doesn't fetch anything (assuming get_T_MAPs doesn't fetch itself)
    v_T_MAP_cursor := get_T_MAPs(1308);

    -- This fetches the first record from the cursor
    FETCH v_T_MAP_cursor
      INTO v_T_MAP_record;

    -- If a record is found we enter a loop
    WHILE v_T_MAP_cursor%FOUND LOOP
      -- output the current record details
      dbms_output.put_line('uc.use_case_id: '||v_T_MAP_record.use_case_id);
      v_T_MAP_count := v_T_MAP_count + 1;

      -- fetch the next record
      FETCH v_T_MAP_cursor
        INTO v_T_MAP_record;
      -- loop back to the start of the while loop
    END LOOP;

    --Close the cursor
    CLOSE v_T_MAP_cursor;

  -- Pointless stupid exception handler
  EXCEPTION
    when OTHERS THEN
      dbms_output.put_line('Error ' || TO_CHAR(SQLCODE) || ': ' || SQLERRM);
  END;

Although this would be a better style:

CREATE OR REPLACE PROCEDURE abc123  IS
  --Variable declarations
  v_T_MAP_record T_MAP_map%ROWTYPE;
  TYPE t_element_cursor IS REF CURSOR;
  v_T_MAP_cursor t_element_cursor;
  v_T_MAP_count number;
BEGIN
  -- This opens the ref cursor, it doesn't fetch anything (assuming get_T_MAPs doesn't fetch itself)
  v_T_MAP_cursor := get_T_MAPs(1308);

  LOOP
    -- This fetches the first/next record from the cursor
    FETCH v_T_MAP_cursor INTO v_T_MAP_record;
    EXIT WHEN v_T_MAP_cursor%NOTFOUND;

    dbms_output.put_line('uc.use_case_id: '||v_T_MAP_record.use_case_id);
    v_T_MAP_count := v_T_MAP_count + 1;
  END LOOP;

  --Close the cursor
  CLOSE v_T_MAP_cursor;
END;

However, I would also change things to use the SYS_REFCURSOR as the need to define your own type from the REF CURSOR was placed back in 9i with the new type built in SYS_REFCURSOR.
There are probably many other things I would like examine why I'm using ref Cursor in the first place and why I try to write data using dbms_output etc., but hey, we all have start somewhere.

Published by: BluShadow on 28-Sep-2012 14:28

Tags: Database

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