Sequence error recovery is returned when you perform a simple extraction

Hi all

According to my understanding, if extract us all lines of a sys_refcursor in a collection in the pl/sql block, then it returns no rows to the calling program. Instead an extraction out of sequence error is encountered. It worked well. However, when I use a single fetch statement (in which case the sys_refcursor contains a single line), I encounter no error "Fetch sequence. It would really help if someone could explain this behavior.

Here is a sample code snippet that I ran into PL/SQL Developer:

CREATE OR REPLACE PROCEDURE test_cur_1 (in_dept_id VARCHAR2,
out_cursor OUT SYS_REFCURSOR) IS
temp_count NUMBER;
temp_rec dept % ROWTYPE;

BEGIN
-This piece of code is running in an error "Out of sequence", trying to open the sys_refcursor.
OPEN FOR Out_cursor
SELECT *.
OF THE Department
WHERE dept_id = in_dept_id ;--dept_id is the primary key

LOOP
EXIT WHEN out_cursor % NOTFOUND;
EXTRACTION out_cursor
IN temp_rec;
dbms_output.put_line (' name of the Department: ' | temp_rec.dept_name);
END LOOP;

EXCEPTION
WHILE OTHERS THEN
OPEN FOR Out_cursor
SELECT SQLCODE. » -> ' || SQLERRM FROM dual;
END;
------------------------------------


CREATE OR REPLACE PROCEDURE test_cur_2 (in_dept_id VARCHAR2,
out_cursor OUT SYS_REFCURSOR) IS
temp_count NUMBER;
temp_rec dept % ROWTYPE;

BEGIN
-This piece of code does not run in an error of "search sequence". Instead the sys_refcursor exit opens for no line to display.
OPEN FOR Out_cursor
SELECT *.
OF THE Department
WHERE dept_id = in_dept_id ;--dept_id is the primary key

EXTRACTION out_cursor
IN temp_rec;

dbms_output.put_line (' name of the Department: ' | temp_rec.dept_name);

EXCEPTION
WHILE OTHERS THEN
OPEN FOR Out_cursor
SELECT SQLCODE. » -> ' || SQLERRM FROM dual;
END;


Appreciate your time!

When you browse a cursor Oracle doesn't know how many lines it will be in the cursor until he extracted all and it cannot know it has extracted all the until he makes a last checkout after obtaining the last row to find that it gets nothing in return. In the code of pseudo-device the fetch command works something like:

open cursor
cursor%notfound := null;
-- This is the fetch phase
ask sql engine to give me a row
if I got one then
   cursor%notfound := false;
   populate variables/record with values
else
   cursor%notfound := true;
end if;
-- end fetch phase
go onto next command in the pl/sql block

So in your first procedure you go get the last line of the cursor, then back to the top of the loop. Because Oracle knows not at this point that the last line has already been read so out_cursor % notfound is always false, so he sent for another how he now "knows" that the last line is read so notfound becomes true and your loop exits, returns control to the caller. At this point, no doubt, the appellant tries to retrieve the cursor. As the handle of the cursor already points past the last line, you get the extraction out of sequence.

In your second procedure, check out you a single line of the cursor. You know that the cursor is oriented to the 'last' line since you query based on the PK, but Oracle is not yet known who. Now return you this slider to the caller who makes extraction more that moves the pointer beyond the end of the cursor. Calling it "sees" no lines, but it is because your procedure already recovered lines, but has not "checked" to the last line.

John

Tags: Database

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