how to read data from CURSOR - mysql stored procedure - mysql

Question

I have implemented the CURSOR inside mysql stored procedure... I am getting challenge while reading the cursor... Basically I want to read column value from cursor & store the same into a variable.. but I am getting the variable value as NULL... What would be the solution... Please help me.. Thanks in advance...
My code is like below,
delimiter //
CREATE PROCEDURE placeOrder(IN cartId INT)
BEGIN
DECLARE countitem INT DEFAULT 0;
DECLARE productId INT;
DECLARE quantity INT;
DECLARE itemDicountAmt DOUBLE DEFAULT 0;
DECLARE v_finished INT DEFAULT 0;
DEClARE cart_cursor CURSOR FOR
SELECT ProductId, Quantity FROM TBL_SHOPPING_CART_ITEM;
-- declare NOT FOUND handler
DECLARE CONTINUE HANDLER
FOR NOT FOUND SET v_finished = 1;
OPEN cart_cursor;
get_cart: LOOP
FETCH cart_cursor into productId, quantity;
IF v_finished = 1 THEN
LEAVE get_cart;
END IF;
-- build email list
insert into debugtable select concat('PRODUCT :', productId);
insert into debugtable select concat('QUANTITY :', quantity);
END LOOP get_cart;
CLOSE cart_cursor;
END//
delimiter ;
OUTPUT:
tmptable
NULL
NULL
As I am having one record in my shopping cart table...

Answer 1

See C.1 Restrictions on Stored Programs :: Name Conflicts within Stored Routines.
Option 1:
...
/*DEClARE cart_cursor CURSOR FOR
SELECT ProductId, Quantity FROM TBL_SHOPPING_CART_ITEM;*/
DEClARE cart_cursor CURSOR FOR
SELECT
TBL_SHOPPING_CART_ITEM.ProductId,
TBL_SHOPPING_CART_ITEM.Quantity
FROM TBL_SHOPPING_CART_ITEM;
...
Option 2:
...
/*DECLARE productId INT;
DECLARE quantity INT;*/
DECLARE _productId INT;
DECLARE _quantity INT;
...
/*FETCH cart_cursor into productId, quantity;*/
FETCH cart_cursor into _productId, _quantity;
...
/*insert into debugtable select concat('PRODUCT :', productId);
insert into debugtable select concat('QUANTITY :', quantity);*/
insert into debugtable select concat('PRODUCT :', _productId);
insert into debugtable select concat('QUANTITY :', _quantity);
...