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我知道这是一个非常基本的问题,但这里是问题所在。 我正在关注doc。在mongodb中查找查询不返回数据
我使用的是mongodb,express和node。
我有一个用户数据收集用户。我想在所有用户的网址'/'上输入json;
var users;
MongoClient.connect("mongodb://localhost:27017/test", function(err, db) {
if(err) { return console.dir(err); }
users = db.collection('users');
});
app.get('/', function (req, res) {
users.find({}, function (err, docs) {
res.send(JSON.stringify(docs));
});
});
但docs对象包含很多东西,但不是所有的用户。 我如何获得所有用户?
Readable {
connection: null,
server: null,
disconnectHandler:
{ s: { storedOps: [], storeOptions: [Object], topology: [Object] },
length: [Getter] },
bson: {},
ns: 'test.users',
cmd:
{ find: 'test.users',
limit: 0,
skip: 0,
query: {},
slaveOk: true,
readPreference: { preference: 'primary', tags: undefined, options: undefined } },
options:
{ skip: 0,
limit: 0,
raw: undefined,
hint: null,
timeout: undefined,
slaveOk: true,
readPreference: { preference: 'primary', tags: undefined, options: undefined },
db:
EventEmitter {
domain: null,
_events: {},
_eventsCount: 0,
_maxListeners: undefined,
s: [Object],
serverConfig: [Getter],
bufferMaxEntries: [Getter],
databaseName: [Getter],
options: [Getter],
native_parser: [Getter],
slaveOk: [Getter],
writeConcern: [Getter] },
promiseLibrary: [Function: Promise],
disconnectHandler: { s: [Object], length: [Getter] } },
topology:
EventEmitter {
domain: null,
_events:
{ reconnect: [Function],
timeout: [Object],
error: [Object],
close: [Function],
destroy: [Object] },
_eventsCount: 5,
_maxListeners: undefined,
s:
{ options: [Object],
callbacks: [Object],
logger: [Object],
state: 'connected',
reconnect: true,
reconnectTries: 30,
reconnectInterval: 1000,
emitError: true,
currentReconnectRetry: 30,
ismaster: [Object],
readPreferenceStrategies: undefined,
authProviders: [Object],
id: 1,
tag: undefined,
disconnectHandler: [Object],
wireProtocolHandler: {},
Cursor: [Object],
bsonInstance: {},
bson: {},
pool: [Object],
serverDetails: [Object] },
name: [Getter],
bson: [Getter],
wireProtocolHandler: [Getter],
id: [Getter] },
cursorState:
{ cursorId: null,
cmd:
{ find: 'test.users',
limit: 0,
skip: 0,
query: {},
slaveOk: true,
readPreference: [Object] },
documents: [],
cursorIndex: 0,
dead: false,
killed: false,
init: false,
notified: false,
limit: 0,
skip: 0,
batchSize: 1000,
currentLimit: 0,
transforms: undefined },
callbacks: null,
logger: { className: 'Cursor' },
_readableState:
ReadableState {
objectMode: true,
highWaterMark: 16,
buffer: [],
length: 0,
pipes: null,
pipesCount: 0,
flowing: null,
ended: false,
endEmitted: false,
reading: false,
sync: true,
needReadable: false,
emittedReadable: false,
readableListening: false,
defaultEncoding: 'utf8',
ranOut: false,
awaitDrain: 0,
readingMore: false,
decoder: null,
encoding: null },
readable: true,
domain: null,
_events: {},
_eventsCount: 0,
_maxListeners: undefined,
s:
{ numberOfRetries: 5,
tailableRetryInterval: 500,
currentNumberOfRetries: 5,
state: 0,
streamOptions: {},
bson: {},
ns: 'test.users',
cmd:
{ find: 'test.users',
limit: 0,
skip: 0,
query: {},
slaveOk: true,
readPreference: [Object] },
options:
{ skip: 0,
limit: 0,
raw: undefined,
hint: null,
timeout: undefined,
slaveOk: true,
readPreference: [Object],
db: [Object],
promiseLibrary: [Function: Promise],
disconnectHandler: [Object] },
topology:
EventEmitter {
domain: null,
_events: [Object],
_eventsCount: 5,
_maxListeners: undefined,
s: [Object],
name: [Getter],
bson: [Getter],
wireProtocolHandler: [Getter],
id: [Getter] },
topologyOptions:
{ socketOptions: {},
auto_reconnect: true,
host: 'localhost',
port: 27017,
cursorFactory: [Object],
reconnect: true,
emitError: true,
size: 5,
disconnectHandler: [Object],
bson: {},
messageHandler: [Function],
wireProtocolHandler: {} },
promiseLibrary: [Function: Promise],
currentDoc: null },
timeout: false,
sortValue: undefined,
readPreference: { preference: 'primary', tags: undefined, options: undefined } }
感谢。我应该使用猫鼬吗? – BoumTAC
如果你需要'ORM'类库,你可以使用猫鼬。有很多猫鼬水线(我更喜欢,因为你可以一起使用不同的数据库)等等。通常,如果我做简单的事情,我只使用mongodb模块,而如果我需要一个更大的结构,我使用水线 – DevAlien