Javascript 如何传递和执行mysql查询?
我想知道如何执行mysql查询,以便客户端可以看到“users registered:number” Server.js:Javascript 如何传递和执行mysql查询?,javascript,mysql,sql,node.js,Javascript,Mysql,Sql,Node.js,我想知道如何执行mysql查询,以便客户端可以看到“users registered:number” Server.js: var http = require('http'); var ejs = require('ejs'); var fs = require('fs'); var mysql = require('mysql'); var connection = mysql.createConnection({ host: '127.0.0.1', user: 'root
var http = require('http');
var ejs = require('ejs');
var fs = require('fs');
var mysql = require('mysql');
var connection = mysql.createConnection({
host: '127.0.0.1',
user: 'root',
password: 'root',
database: 'kitsune',
connectionLimit: 50,
port: 3306 });
connection.connect(function(err) {
if (err) throw err;
});
connection.query('SELECT 1 + 1 AS solution', function (error, results, fields) {
if (error) throw error;
console.log('The solution is: ', results[0].solution);
});
module.exports = connection;
http.createServer(function(req,res) {
res.writeHead(200, {'Content-Type': 'text/html'});
fs.readFile('index.html', 'utf-8', function(err, content) {
if (err) {
res.end('error occurred');
return;
}
var countQuery = "SELECT Count(ID) AS NumberOfPenguins FROM Penguins"; console.log(countQuery);
connection.query(countQuery, function(err, rows) {
if (err) throw err;
console.log('Connected!');
});
var renderedHtml = ejs.render(content, {countQuery: countQuery});
res.end(renderedHtml);
});
}).listen(80);
index.html:
<html>
<head>
</head>
<body>
Users registered: <%= countQuery %>
</body>
</html>
注册用户:
这仅显示查询,但不执行查询。知道如何执行吗?您确实执行了查询,但从未对结果做过任何处理。结果是在回调函数中传递
行
connection.query(countQuery, function(err, rows) {
if (err) throw err;
var renderedHtml = ejs.render(content, {countQuery: rows});
res.end(renderedHtml);
});
您需要处理查询的结果。connection.query(countQuery,…返回一个结果,该结果应包含您想要的内容。我明天会查看此结果,因为我现在正在使用手机。感谢您花时间提供帮助。此操作不起作用,因为它以普通方式返回查询,或者[object object object]尝试更改
无效。返回了sql查询,但仍然返回了[object]使用上面的答案。出于某种原因,它没有执行查询。请在发送countQUERY:JSON.stringify(rows)})
@JavaSherwood之前尝试对行进行字符串化