add the return statement and you will report an error, but if you don"t add it, you will ok,. Why?

router.post("/aaaa", upload.any(), function (req, res, next) {
    sql.getConnection(function (err, connection) {
        if (err) throw err;
        connection.query({
            sql: "sql",
            timeout: 40000, // 40s
            values: [111, 0, 10]
        }, function (error, results, fields) {
            if (error) throw error;
            res.send(JSON.stringify({
                resultCode: "00000",
                resultMsg: "",
                data: results
            }));
        });
        connection.release();
    });
    //return;
});