如何使用node.js MySQL从MySql DB获取结果并将它们发送回API.ai - DialogFlow
问题描述：
我遇到问题，从MySql数据库检索结果并将结果发送到API.ai.具体问题是如何等待结果可用，然后在JSON对象将结果发送回API.ai如何使用node.js MySQL从MySql DB获取结果并将它们发送回API.ai - DialogFlow
这是我有：
在网络挂接或服务，接收后的JSON请求，我调用一个方法：
if (action === 'get.data') {
// Call the callDBJokes method
callDB().then((output) => {
// Return the results to API.AI
res.setHeader('Content-Type', 'application/json');
res.send(JSON.stringify(output));
}).catch((error) => {
// If there is an error let the user know
res.setHeader('Content-Type', 'application/json');
res.send(JSON.stringify(error));
});
}
它调用其中执行数据库调用该方法callDB（）：
function callDB() {
return new Promise((resolve, reject) => {
try {
var connection = mysql.createConnection({
host: "127.0.0.1",
user: "root",
password: "x",
database: 'y'
});
connection.query('SELECT 1 + 1 AS solution', function (error, results, fields) {
if (!error) {
let response = "The solution 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 Failed.'};
console.log(output);
reject(output);
}
});
connection.end();
} catch (err) {
let output = {'speech': 'try-cacth block error', 'displayText': 'try-cacth block error'};
console.log(output);
reject(output);
}
}
);
}
我得到API.ai的JSON响应，如：
{
"id": "5daf182b-009f-4c11-a654-f2c65caa415e",
"timestamp": "2017-08-29T07:24:39.709Z",
"lang": "en",
"result": {
"source": "agent",
"resolvedQuery": "get data",
"action": "get.data",
"actionIncomplete": false,
"parameters": {},
"contexts": [
{
"name": "location",
"parameters": {
"date": "",
"geo-city": "Perth",
"date.original": "",
"geo-city.original": "perth"
},
"lifespan": 2
},
{
"name": "smalltalkagentgeneral-followup",
"parameters": {},
"lifespan": 2
}
],
"metadata": {
"intentId": "4043ad70-289f-441c-9381-e82fdd9a9985",
"webhookUsed": "true",
"webhookForSlotFillingUsed": "false",
"webhookResponseTime": 387,
"intentName": "smalltalk.agent.general"
},
**"fulfillment": {
"speech": "error",
"displayText": "error",
"messages": [
{
"type": 0,
"speech": "error"**
}
]
},
"score": 1
},
**"status": {
"code": 200,
"errorType": "success"**
},
"sessionId": "c326c828-aa47-490c-9ca0-37827a4e348a"
}
我只得到了错误消息，但不会从数据库中的结果。我读过它也可以使用回调来完成，但我还没弄明白。我可以看到数据库连接正在工作，因为连接的日志显示连接尝试。
任何帮助将不胜感激。谢谢。
答
通过声明var mysql = require（'mysql'）; as const mysql = require（'mysql'）;不在函数内部，而是在exports.myfunction声明之前。工作示例代码以获取如何使用Node.js的MySQL从MySQL数据库的结果，并且将它们送回API.ai如下：
'use strict';
const mysql = require('mysql');
exports.her_goes_your_function_name = (req, res) => { //add your function name
//Determine the required action
let action = req.body.result['action'];
if (action === 'get.data') {
// Call the callDBJokes method
callDB().then((output) => {
// Return the results of the weather API to API.AI
res.setHeader('Content-Type', 'application/json');
res.send(JSON.stringify(output));
}).catch((error) => {
// If there is an error let the user know
res.setHeader('Content-Type', 'application/json');
res.send(JSON.stringify(error));
});
}
};
function callDB() {
return new Promise((resolve, reject) => {
try {
var connection = mysql.createConnection({
host: "127.0.0.1",
user: "your_user",
password: "your_pass",
database: "your_DB"
});
connection.query('SELECT 1 + 1 AS solution', function (error, results, fields) {
if (!error) {
let response = "The solution 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 Failed.'};
console.log(output);
reject(output);
}
});
connection.end();
} catch (err) {
let output = {'speech': 'try-cacth block error', 'displayText': 'try-cacth block error'};
console.log(output);
reject(output);
}
}
);
}
使用'的console.log（）'调试代码。我还推荐if（！error）的其他部分，您可以在其中进行拒绝（错误）;检查连接是否正常工作。 – Myonara
好像你在访问数据库时出错。我将隔离并尝试运行访问数据库的代码，查看出现的错误并修复出现的问题并从中进行迭代。然后将固定的数据库访问代码放回到您的应用程序中，然后重试。 – matthewayne
您是否正确地在您的机器上设置了您的MySQL数据库？ – matthewayne