我正在从不同来源获取新闻资讯&添加到DB但我得到以下异常
错误:在已经将握手排队后无法将握手排入队列。 在Protocol._validateEnqueue(/home/vikas/node_modules/mysql/lib/protocol/Protocol.js:210:16) 在Protocol._enqueue(/home/vikas/node_modules/mysql/lib/protocol/Protocol.js:139:13) 在Protocol.handshake(/home/vikas/node_modules/mysql/lib/protocol/Protocol.js:52:23) 在Connection.connect(/home/vikas/node_modules/mysql/lib/Connection.js:130:18) at storeNewsFeedsInDB(/ home / vikas / NodeJS Practice / fetchNews.js:42:7) 在newsapi.v2.everything.then.response(/ home / vikas / NodeJS Practice / fetchNews.js:33:9) 在tryCatcher(/home/vikas/node_modules/bluebird/js/release/util.js:16:23) 在Promise._settlePromiseFromHandler(/home/vikas/node_modules/bluebird/js/release/promise.js:512:31) 在Promise._settlePromise(/home/vikas/node_modules/bluebird/js/release/promise.js:569:18) 在Promise._settlePromise0(/home/vikas/node_modules/bluebird/js/release/promise.js:614:10) 在Promise._settlePromises(/home/vikas/node_modules/bluebird/js/release/promise.js:693:18) at Async._drainQueue(/home/vikas/node_modules/bluebird/js/release/async.js:133:16) at Async._drainQueues(/home/vikas/node_modules/bluebird/js/release/async.js:143:10) 在Immediate.Async.drainQueues(/home/vikas/node_modules/bluebird/js/release/async.js:17:14) 在runCallback(timers.js:637:20) 在tryOnImmediate(timers.js:610:5)
以下是我的代码
const NewsAPI = require('newsapi');
const newsapi = new NewsAPI('*****************************');
var mysql = require('mysql');
var con = mysql.createConnection({
host: "****",
user: "****",
password: "****",
database: "****"
});
var channels = ['bbc-news', 'the-verge', 'reuters', 'cnbc', 'bloomberg', 'economist', 'nytimes'];
var topics = ['technology', 'business', 'finance', 'tech', 'economics', 'company'];
for (var i = 0; i < channels.length; i++) {
for (var j = 0; j < topics.length; j++) {
newsapi.v2.everything({
q: topics[j],
// q: 'technology',
sources: channels[i],
// sources: 'bloomberg',
// domains: 'bbc.co.uk, techcrunch.com',
from: '2018-03-14',
to: '2018-03-14',
language: 'en',
sortBy: 'relevancy',
pageSize:100,
page: 1
}).then(response => {
// console.log(response);
for (var i = 0; i < response.articles.length; i++) {
// console.log(response.articles[i].title);
storeNewsFeedsInDB(response.articles[i].title,
response.articles[i].description,
response.articles[i].url);
}
});
}
}
function storeNewsFeedsInDB(title, description, url) {
con.connect(function(err) {
if (err) throw err;
console.log("Connected!");
//Insert a record in the "newsfeeds" table:
var sql = "INSERT IGNORE INTO newsfeeds (`title`, `description`, `url`) VALUES ('"
+ title.replace(/'/g, "\\'") + "', '" + description.replace(/'/g, "\\'") + "', '" + url + "')";
console.log(sql);
con.query(sql, function (err, result) {
if (err) throw err;
console.log("1 record inserted");
});
});
}
Nodejs&amp; Mysql,请帮帮我。
答案 0 :(得分:2)
你正在(嵌套)循环中调用storeNewsFeedsInDB
,每次访问它时都会调用con.connect
,这就是你得到“排队握手”错误的原因。查看one of mysql
npm package test suites可能会显露出来,因为一旦进行了两次con.connect
次调用,就会抛出错误。
您应该善于删除代码中的con.connect
来电,因为任何query
调用都隐式建立了连接as the docs say。