Stored Procedure Output in NodeJS - mysql

Question

Can someone tell me what is wrong with this code? I am getting syntax error near Select category_ID;
I am using latest version is mysql in nodejs
Note - If i remove the output params, Input code is properly working.
Node Server Code -
app.post('/api/createcategory', function (req, res) {
name = req.body.categoryName, icon = req.body.categoryIcon;
let createcategory = `CALL spAddCategory(?, ?, #category_id); SELECT #category_id;`
db.query(createcategory, [name, icon], (err, result) => {
if(err) {throw err};
console.log(result);
})
res.send('Category Created')
})
SQL Query -
CREATE PROCEDURE spAddCategory ( IN category_name varchar(255), IN category_icon varchar(255), OUT category_id int )
BEGIN
INSERT INTO categories ( categoryName, categoryIcon )
VALUES ( category_name, category_icon );
SELECT categoryID INTO category_id FROM categories
WHERE categoryName = category_name;
END

Answer 1

Instead of OUT-variables (which are useful mainly between procedures), consider handling the output as normal result set:
app.post('/api/createcategory', function (req, res) {
name = req.body.categoryName, icon = req.body.categoryIcon;
let createcategory = `CALL spAddCategory(?, ?);`
db.query(createcategory, [name, icon], (err, result) => {
if(err) {throw err};
console.log(result[0]);
})
res.send('Category Created')
})
And the procedure, returns the result set which contains the last inserted id (assuming the categoryID is an AUTO_INCREMENT id):
CREATE PROCEDURE spAddCategory (
category_name varchar(255),
category_icon varchar(255)
)
BEGIN
INSERT INTO categories ( categoryName, categoryIcon )
VALUES ( category_name, category_icon );
SELECT last_insert_id();
END
Note that you may end up with more than one category with same name.