[英]Mongoose.connect not throwing any error, when Mongodb is not running
解决:如果有人感兴趣,似乎MongoDB只是在Windows启动时自动启动......
我有这个函数来初始化猫鼬连接:
const mongoose = require('mongoose');
let db;
async function initDD(){
try {
db = await mongoose.connect('mongodb://localhost:27017/local', { useNewUrlParser: true });
} catch (error) {
console.log('mongoose error',error)//Doesn't come to this...
}
}
这个承诺不会被拒绝,即使我还没有开始我的 MongoDB 服务。 我也尝试了回调版本-相同的结果。 我显然没有运行任何 MongoDB,但 Mongoose “连接”,好像没有任何问题。
这里可能有什么问题? 我有一个标准的 MongoDB 设置、最新的 Mongoose、Windows 7 和 Node 10。
编辑:“db”的记录值,当没有 MogoDB 运行时:
Mongoose {
connections:
[ NativeConnection {
base: [Circular],
collections: [Object],
models: [Object],
config: [Object],
replica: false,
options: null,
otherDbs: [],
relatedDbs: {},
states: [Object],
_readyState: 1,
_closeCalled: false,
_hasOpened: true,
plugins: [],
_listening: false,
_connectionOptions: [Object],
name: 'local',
host: 'localhost',
port: 27017,
user: undefined,
pass: undefined,
client: [MongoClient],
'$initialConnection': [Promise],
db: [Db] } ],
models: { User: Model { User } },
modelSchemas:
{ User:
Schema {
obj: [Object],
paths: [Object],
aliases: {},
subpaths: {},
virtuals: [Object],
singleNestedPaths: {},
nested: {},
inherits: {},
callQueue: [],
_indexes: [],
methods: {},
methodOptions: {},
statics: {},
tree: [Object],
query: {},
childSchemas: [],
plugins: [Array],
'$id': 1,
s: [Object],
_userProvidedOptions: {},
options: [Object],
'$globalPluginsApplied': true } },
options: { pluralization: true, [Symbol(mongoose:default)]: true },
_pluralize: [Function: pluralize],
Schema:
{ [Function: Schema]
reserved:
[Object: null prototype] {
populated: 1,
remove: 1,
validate: 1,
toObject: 1,
schema: 1,
save: 1,
modelName: 1,
get: 1,
isNew: 1,
isModified: 1,
init: 1,
errors: 1,
db: 1,
collection: 1,
removeListener: 1,
listeners: 1,
once: 1,
on: 1,
emit: 1,
prototype: 1 },
Types:
{ String: [Function],
Number: [Function],
Boolean: [Function],
DocumentArray: [Function],
Embedded: [Function: SingleNestedPath],
Array: [Function],
Buffer: [Function],
Date: [Function],
ObjectId: [Function],
Mixed: [Function],
Decimal: [Function],
Decimal128: [Function],
Map: [Function: Map],
Oid: [Function],
Object: [Function],
Bool: [Function],
ObjectID: [Function] },
ObjectId:
{ [Function: ObjectId]
schemaName: 'ObjectId',
get: [Function],
_checkRequired: [Function],
_cast: [Function: castObjectId],
cast: [Function: cast],
checkRequired: [Function] } },
model: [Function],
plugins:
[ [ [Function], [Object] ],
[ [Function], [Object] ],
[ [Function], [Object] ],
[ [Function], [Object] ] ] }
我也有Windows。 安装 Mongo 后,它会在后台运行并且很好,否则您每次都必须手动启动一个mongod
实例。
即使现在支持try/catch
我也更喜欢使用then/catch
:
mongoose.connect(
'mongodb://localhost:27017/test',{
useNewUrlParser: true,
useCreateIndex: true,
useFindAndModify: false,
useUnifiedTopology: true
}
)
.then(() => console.log('DB Connection Successfull'))
.catch((err) => {
console.error(err);
});
如果你不想缓冲你的模型,从而导致混乱的行为,你需要在你的架构上或全局禁用它:
https://mongoosejs.com/docs/guide.html#bufferCommands https://mongoosejs.com/docs/connections.html#buffering
参考: mongoose
文档
我不知道。 但我认为您应该执行该功能。 等待initDD()。 只需少量代码即可了解会发生什么。
类似的东西
//数据库.js
const mongoose = require("mongoose");
async function connect() {
await mongoose.connect(process.env.DATABASE_SERVER, {
useNewUrlParser: true
});
if (mongoose.connection.readyState === 1) {
console.log("Successfully connected to database");
}
}
module.exports = { connect };
// index.js
const app = require("./app");
const { connect } = require("./database");
async function main() {
// dayabase conexion
await connect();
// start server
const port = process.env.PORT || 4000;
await app.listen(port, () => console.log(`Server on port ${port} `));
}
main();
用'mongodb://localhost:27017/local'替换process.env.DATABASE_SERVER
试试 MongoClient.connect
async function initDD() {
try {
await MongoClient.connect("mongodb://localhost:27017/test", {
useNewUrlParser: true
});
} catch (error) {
console.log("error is ->" + error);
}
}
initDD();
错误是——
error is ->MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017]
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