为什么此Node.js try-catch块未捕获错误？

Question

try {
  db_conn.query(sqlq, (error, results, fields) => {
    if (error) throw error;
    if (!results.length) {
      throw new Error('df');
    }
    return;
  });
} catch (e) {
  res.status(400)
  res.send()
  return 0;
}

我在第5行中抛出错误以退出sql查询功能，并且我希望try-catch能够捕获该错误并将状态设置为400并发送响应。这就是结果。

D:\CodingData\SID-API-Server\node_modules\mysql\lib\protocol\Parser.js:80
    throw err; // Rethrow non-MySQL errors
    ^

Error: df
    at Query.db_conn.query (D:\CodingData\SID-API-Server\routes\api.js:45:15)
    at Query.<anonymous> (D:\CodingData\SID-API-Server\node_modules\mysql\lib\Connection.js:502:10)
    at Query._callback (D:\CodingData\SID-API-Server\node_modules\mysql\lib\Connection.js:468:16)
    at Query.Sequence.end (D:\CodingData\SID-API-Server\node_modules\mysql\lib\protocol\sequences\Sequence.js:83:24)
    at Query._handleFinalResultPacket (D:\CodingData\SID-API-Server\node_modules\mysql\lib\protocol\sequences\Query.js:139:8)
    at Query.EofPacket (D:\CodingData\SID-API-Server\node_modules\mysql\lib\protocol\sequences\Query.js:123:8)
    at Protocol._parsePacket (D:\CodingData\SID-API-Server\node_modules\mysql\lib\protocol\Protocol.js:278:23)
    at Parser.write (D:\CodingData\SID-API-Server\node_modules\mysql\lib\protocol\Parser.js:76:12)
    at Protocol.write (D:\CodingData\SID-API-Server\node_modules\mysql\lib\protocol\Protocol.js:38:16)
    at Socket.<anonymous> (D:\CodingData\SID-API-Server\node_modules\mysql\lib\Connection.js:91:28)

可能nodejs mysql软件包捕获错误，无所事事。几天前，此代码有效。 sql查询没有错误。