注册，UnhandledPromiseRejectionWarning，UnhandledPromiseRejectionWarning：QueryResultError：0，DeprecationWarning
你好，我有麻烦试图找出为什么我不断收到这漫长的错误消息。我试图创建一个使用Node.js的，PG-承诺与PostgreSQL数据库的简单注册功能。
(node:79941) UnhandledPromiseRejectionWarning: QueryResultError: 0
at new QueryResultError (/Users/Documents/Login_Reg_app/node_modules/pg-promise/lib/errors/queryResult.js:131:24)
at Query.ctx.db.client.query (/Users/Documents/Login_Reg_app/node_modules/pg-promise/lib/query.js:209:41)
at Query.handleReadyForQuery (/Users/Documents/Login_Reg_app/node_modules/pg/lib/query.js:125:10)
at Connection.<anonymous> (/Users/Documents/Login_Reg_app/node_modules/pg/lib/client.js:192:19)
at Connection.emit (events.js:180:13)
at Socket.<anonymous> (/Users/Documents/Login_Reg_app/node_modules/pg/lib/connection.js:125:12)
at Socket.emit (events.js:180:13)
at addChunk (_stream_readable.js:274:12)
at readableAddChunk (_stream_readable.js:261:11)
at Socket.Readable.push (_stream_readable.js:218:10)
(node:79941) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:79941) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
POST /signup - - ms - -
在我的代码我试图检查用户的电子邮件在我的数据库中已经注册。如果是这样，我想提醒的电子邮件是在使用中，否则，进入到网站登记。如果我注释掉，如果用户的电子邮件地址已经被注册代码的第一部分，多数民众赞成检查，登记代码工作就好了。反之为来检查，如果用户邮箱已经在数据库的代码。问题是，当我试图让他们都为一个功能一起工作。代码炸毁;（
请参阅我的代码
app.post('/', (req, res, next) => {
const {
first_name,
last_name,
user_name,
email,
password
} = req.body;
const created_on = date;
const saltRounds = 10;
//If user already exist in PostgreSQL Database
db.one('SELECT user_id, first_name, last_name, email, user_name, password, created_on FROM users WHERE email = $1', [email])
.then(user => {
if (user) {
return res.json({
message: 'Email Already Exist' + email,
user: user
})
.catch(error => {
res.json({
error: error,
message: 'Unable to locate Email'
})
console.log(error);
})
} else {
bcrypt.hash(password, saltRounds, (err, hash) => {
//If user never registered for website then following will execute
db.none('INSERT INTO users(first_name, last_name, user_name, password, email,created_on) VALUES($1,$2,$3,$4,$5,$6)', [first_name, last_name, user_name, hash, email, created_on])
.then(users => {
res.json({
message: 'User Created on ' + date,
userInfo: req.body
})
})
.catch(error => {
res.json({
error: error,
message: 'Unable to Create User'
})
console.log(error);
})
})
}
})
})QueryResultError: 0意味着查询没有结果，但返回的行预期数量不能为零。使用.one要求查询返回一行。
所以你db.one('SELECT user_id, first_name, last_name, email, user_name, password, created_on FROM users WHERE email = $1', [email])不会为email返回结果。
它是一个UnhandledPromiseRejectionWarning因为你不处理这种情况。
db.one('SELECT user_id, first_name, last_name, email, user_name, password, created_on FROM users WHERE email = $1', [email])
.then(user => {
if (user) {
// ...
} else {
// ...
} /*, function(err) {} */)
// or .catch(function(err) {}) is missing here
但是因为你的if(user)的程序逻辑预计，该查询eitherreturns具体哪一行或没有，所以你正在寻找.oneOrNone(...)而不是.one(...)。因此，最终的代码看起来类似的东西：
db.oneOrNone('SELECT user_id, first_name, last_name, email, user_name, password, created_on FROM users WHERE email = $1', [email])
.then(user => {
if (user) {
return res.json({
message: 'Email Already Exist' + email,
user: user
})
} else {
bcrypt.hash(password, saltRounds, (err, hash) => {
//If user never registered for website then following will execute
db.none('INSERT INTO users(first_name, last_name, user_name, password, email,created_on) VALUES($1,$2,$3,$4,$5,$6)', [first_name, last_name, user_name, hash, email, created_on])
.then(users => {
res.json({
message: 'User Created on ' + date,
userInfo: req.body
})
})
.catch(error => {
res.json({
error: error,
message: 'Unable to Create User'
})
console.log(error);
})
})
}
})
.catch(error => {
res.json({
error: error,
message: 'Unexpected error'
})
console.log(error);
})
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