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[英]Cannot read property 'length' of undefined when trying to read the results of a MYSQL query
[英]MYSQL length of results undefined
*抛出错误; // 重新抛出非 MySQL 错误 ^
类型错误:无法读取未定义的属性“长度”*
数据库.js:
function validateUser(username, password) {
var sql = "SELECT * FROM users WHERE username = ? AND password = ?";
var values = [[username, password]];
con.query(sql,[values], function(err, results) {
if (results.length > 0){
return true;
}
else return false;
})
}
服务器.js:
app.post('/auth', function(req,res) {
console.log('form submitted');
if(db.validateUser(req.body.username,req.body.password)){
console.log('login successful');
}
res.status(200);
res.redirect(URL);
});
首先请不要将密码保存为纯文本。
例如https://cdnjs.com/libraries/jsSHA
对于您的代码:
function validateUser(username, password) {
var sql = "SELECT * FROM users WHERE username = ? AND password = ?";
var values = [username, password];
con.query(sql,values, function(err, results) {
if (results.length > 0){
return true;
}
else return false;
})
}
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