我需要一些帮助来确定SQL查询的语法，同时通过连接到Google云Mysql数据库的api.ai webhook &使用它们。 虽然查询工作，在 '请求被超时'如何从MySql数据库中获取结果并将它们发送回API.ai

'use strict'; 
const mysql = require('mysql'); 

exports.name = (req, res) => { 

    let action = req.body.result['action']; 

if (action === 'apple') { 


    callDB().then((output) => { 

     res.setHeader('Content-Type', 'application/json'); 
     res.send(JSON.stringify(output)); 
    }).catch((error) => { 

     res.setHeader('Content-Type', 'application/json'); 
     res.send(JSON.stringify(error)); 
    }); 

} 
}; 

function callDB() { 
    return new Promise((resolve, reject) => { 

    try { 

     var connection = mysql.createConnection({ 
      host: "", 
      user: "", 
      password: "", 
      database: "" 
     }); 

     connection.query("SELECT description AS solution FROM mtable WHERE title LIKE '%Breakfast%'", function (error, results, fields) { 
      if (!error) { 

       let response = "The result is: " + results[0].solution; 
       response = response.toString(); 
       let output = {'speech': response, 'displayText': response}; 
       console.log(output); 
       resolve(output); 

      } else { 

       let output = {'speech': 'Error. Query Failed.', 'displayText': 'Error. Query Failed4.'}; 
       console.log(output); 
       reject(output); 

      } 
     }); 
     connection.end(); 

    } catch (err) { 
     let output = {'speech': 'try-catch block error', 'displayText': 'try-catch block error3'}; 
     console.log(output); 
     reject(output); 

    } 

} 
); 
} 

如果我取代与此查询，它的工作原理：

'SELECT描述AS解决方案从mtable WHERE ID LIKE 1001'

ID是列名，只有id`s

标题列名和标题，如早餐包等

这是网络挂接JSON所示的错误的部分：

"metadata": { 
    "intentId": "", 
    "webhookUsed": "true", 
    "webhookForSlotFillingUsed": "false", 
    "webhookResponseTime": 5000, 

"status": { 
"code": 206, 
"errorType": "partial_content", 
"errorDetails": "Webhook call failed. Error: Request timeout.", 
"webhookTimedOut": true 
    }, 

我引用的代码如下线程， How to get results from MySql DB using node.js MySQL and send them back to API.ai