CouchDb未处理的“错误”事件-Node js [英] CouchDb unhandled 'error' event - Node js

问题描述

我是Node和CouchDb的新手，我正在尝试入门。
我正在努力编写一段代码来工作。
我想创建一个表 users ，插入一个新用户并同时获得另一个用户。

I'm new to Node and CouchDb and I'm trying to get my hands on it. I'm struggling to make a piece of code to work. I would like to create a table users, insert a new user and 'at the same time' getting another user.

启动 node app.js 时出现此错误：

antoine@ubuntu:~/projects/couchDb$ node app.js 
Database users exists.
{"error":"conflict","reason":"Document update conflict."}
Leaving saveDoc

events.js:48
        throw arguments[1]; // Unhandled 'error' event
                       ^
Error: socket hang up
    at createHangUpError (http.js:1107:15)
    at Socket.onend (http.js:1188:27)
    at TCP.onread (net.js:369:26)

---

这是我的代码，有什么问题吗？
（当我删除getDoc函数时，错误消失了）
我正在使用couchDB 1.0.1和节点0.6.12

---

And here is my very code, is there something wrong? (When I remove the getDoc function the error goes away) I'm using couchDB 1.0.1 and node 0.6.12

code> jdoe4 和 jdoe 文档已经存在于 users 数据库中。

The jdoe4 and jdoe documents are already present in the users database.

var dbHost = "127.0.0.1";
var dbPort = 5984;
var dbName = 'users';

var couchdb = require('felix-couchdb');
var client = couchdb.createClient(dbPort, dbHost);

var user = {
  name: {
    first: 'John',
    last: 'Doe'
  }
}

var db = client.db(dbName);

db.exists(function(err, exists) {
  if (!exists) {
    db.create();
    console.log('Database ' + dbName + ' created.');
  } else {
    console.log('Database ' + dbName + ' exists.');
  }

  db.saveDoc('jdoe4', user, function(err, doc) {
    if( err) {
          console.log(JSON.stringify(err));
        } else {
          console.log('Saved user.');
        }
        console.log('Leaving saveDoc');
    });

    db.getDoc('jdoe', function(err,doc) {
        if( err) {
            console.log(JSON.stringify(err));
        } else {
            console.log(JSON.stringify(doc));
        }
        console.log('Leaving getDoc');
    });

});

推荐答案

我很快意识到felix-couchdb与节点8（我知道您没有使用版本8，但是有一天会使用），所以我切换到了nano Sofadb，这是以下代码：

I quickly realized that felix-couchdb is not compatible with node 8 (I know you're not using version 8, but you will someday), so I switched to nano couchdb and here's the following code:

1. 它将检查是否已创建数据库


2. 仅在给定键唯一的情况下才会插入



3. 它将获得具有密钥的用户

1. It will check if the db is created
2. It will insert only if the key given is unique

3. It will get the user with a key

var couchdb = require('nano')('http://localhost:5984')
  , dbName = 'users'
  , db = couchdb.use(dbName)
  ;

var user = {
    name: {
        first: 'John',
        last: 'Doe'
    }
}

couchdb.db.create(dbName, function(err, db_body) {

db.insert(user, 'jdoe4', function(err, doc, header) {
    if( err) {
      console.log('Cannot save user');
    } else {
      console.log('Saved user.');
    }
    console.log('Leaving saveDoc');
});

db.get('jdoe', function(err, doc) {
    if( err) {
        console.log('Cannot get user');
    } else {
        console.log(JSON.stringify(doc));
    }
    console.log('Leaving getDoc');
});

});

值得注意的是，会在相同时间获得它们，它仍然向数据库发出3个请求，1个检查它是否存在，1个插入（或不插入），1个获得。

One thing worth noting is that, while this will get them at the "same time," it's still making 3 requests to the db, 1 to check if it exists, 1 to insert (or not), 1 to get.

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