Kill running query with Sequelize - mysql

Question

I am working with sequelize and MySQL DB. I have some heavy queries that the users can cancel by clicking a 'cancel' button in the GUI.
I tried to do it with transaction but when I do t.rollback() the query doesn't getting killed in the DB. Is there any way to kill a query using sequelize?
I prefer to use sequlize to do it, but even getting the query ID and manually kill it is fine.
.transaction(async (t) => {
if (transaction) {
transaction.rollback();
}
transaction = t;
return db.myTable.findAll(data);
})
.then((data) => {
transaction = {};
return data;
})
.catch((error) => {
transaction = {};
throw error;
});

Answer 1

Not natively supported with Sequelize. There is an open, inactive issue to add this ability there, with a workaround used for PostgreSQL.
const killableQuery = async (query, req, options = {}) => {
const connection = await sequelize.connectionManager.getConnection();
req.on('close', () => {
sequelize.query(`SELECT pg_terminate_backend(${connection.processID});`)
.catch((error) => {
console.error('Unable to terminate query!', error);
});
});
const result = await sequelize.query(query, {
...options,
transaction: { connection },
});
await sequelize.connectionManager.releaseConnection(connection);
return result;
};
Sorry, I cannot find detail about the processID property and whether it corresponds to a property that MySQL tracks. If yes, one could replace the PostgreSQL statement with a MySQL counterpart like:
SELECT GROUP_CONCAT(CONCAT('KILL ',id,';') SEPARATOR ' ')
FROM information_schema.processlist
WHERE user <> 'system user'
AND -- <condition based on processID>;