I am trying to make transaction in nodejs
The logic will be check if sufficient coin in sender's amount, if sufficient then do transaction.
I am new to postgres, not sure if this is a right way to do so, if you have a better solution, please let me know, thank you.
const coin = 10
const senderId = 1
const receiverId = 2
await pgPool.query(`
DO $$
BEGIN
if (SELECT coin from app_user where id = $1) >= $3 THEN
UPDATE app_user set coin = coin - $3 where id = $1;
UPDATE app_user set coin = coin + $3 where id = $2;
INSERT INTO coin_history(sender_id, receiver_id, amount) VALUES ($1, $2, $3)
END IF;
END;
$$`,[senderId, receiverId, coin]);
Error (node:10044) UnhandledPromiseRejectionWarning: error: bind message supplies 3 parameters, but prepared statement "" requires 0
