MySQL Stored Procedures : cursor declaration - mysql

Question

Sorry for the vague title, here is my problem. I have stored procedures for DB2 that i try to convert for MySQL. I'd like to know if i can write the SELECT statement in the cursor declaration as a string variable. For example with DB2 i have this :
(...)
-- Declare cursors
DECLARE c_very_init CURSOR WITH RETURN FOR s_very_init;
DECLARE c_date CURSOR WITH RETURN FOR s_date;
DECLARE CONTINUE HANDLER FOR not_found
SET at_end = 1;
-- In case the_date is 0, retrieve the first date
IF the_date = 0 THEN
SET sql_end_date = '
SELECT DATE
FROM ACCOUNTS
WHERE REF = ''' || the_ref || '''
ORDER BY ID ASC FETCH FIRST 1 ROWS ONLY';
PREPARE s_date FROM sql_end_date;
OPEN c_date;
FETCH FROM c_date INTO data_ins;
SET the_last_date = data_ins;
CLOSE c_date;
ELSE
SET the_last_date = the_date;
END IF;
-- Get the 'very' initial value
SET sql_very_init = '
SELECT in, out
FROM MOVEMENTS
WHERE REF = ''' || the_ref || '''
AND DATE < ' || the_last_date;
PREPARE s_very_init FROM sql_very_init;
OPEN c_very_init;
FETCH FROM c_very_init INTO dare, avere;
-- Loop through the results
(...)
I declare a c_very_init cursor, but at the time of the cursor declaration in the SP i still don't know the full select statement because i need to fetch (if necessary) the the_last_date value. It seems i can't do this :
DECLARE c_very_init CURSOR WITH RETURN FOR s_very_init;
with MySQL, the syntax being with the statement directly in the declaration :
DECLARE c_very_init CURSOR FOR SELECT blaablaa...;
Am i wrong?
Thank you.
fabien.

Answer 1

No, you cannot declare cursors in this way. But if 'the_ref' is a variable, you could do it like this -
...
DECLARE the_ref INT DEFAULT 10;
DECLARE cur1 CURSOR FOR SELECT column1 FROM table1 WHERE column1 = the_ref;
...