MySQL stored procedure UPDATE changing first row only - mysql

Question

I have the following watching table
If I run this simple test query:
UPDATE
`watching`
SET
`lastPriceSeen` = 1.33
WHERE
`email` = 'blablanfff#gmail.com' AND
`productId` = 254857265
LIMIT 1
row ID 10 correctly updates to 1.33 in the lastPriceSeen column
If I convert this to a stored procedure:
DELIMITER ;;
CREATE PROCEDURE `updateLastSeenPrice`(
email VARCHAR(100),
productId INT(11),
price FLOAT
)
DETERMINISTIC
COMMENT 'Updates watcher last seen price'
BEGIN
UPDATE
`watching`
SET
`lastPriceSeen` = price
WHERE
`email` = email AND
`productId` = productId
LIMIT 1;
END;;
DELIMITER ;
and run CALL updateLastSeenPrice('blablanfff#gmail.com','254857265', 1.11)
Only the first row (ID 1) gets updated with the price, when I was expecting row ID 10 to update.
This makes no sense to me, the WHERE clause should prevent this from happening, and it's the same query! I've even added a SELECT at the end of the stored procedure to test it's receiving the IN parameters correctly and it is...
Any ideas as to why the first row gets updated? Why is it matching on that when the WHERE clause should prevent it from doing so?

Answer 1

The WHERE clause doesn't see the difference between the column name and parameter name. Therefore, any record will do and it will update the first one.
Change it into:
CREATE PROCEDURE `updateLastSeenPrice`(
p_email VARCHAR(100),
p_productId INT(11),
p_price FLOAT
)
DETERMINISTIC
COMMENT 'Updates watcher last seen price'
BEGIN
UPDATE
`watching`
SET
`lastPriceSeen` = p_price
WHERE
`email` = p_email AND
`productId` = p_productId
LIMIT 1;
END;;
DELIMITER ;