如何使用Couchbase和Node.js SDK在存储桶中执行更新和删除操作 [英] How to perform Update and Delete operations in a bucket using Couchbase and Nodejs sdk
问题描述
我正在使用Node.js从mongodb迁移到Couchbase.我想执行CRUD操作. Insert(create)和 Get 工作正常,但是当我想执行 Update 和 Delete 时遇到一些错误消息(此处使用'upsert','replace'进行更新)类似于
I am moving from mongodb to Couchbase using Node.js. I want to perform the CRUD operations. Insert(create) and Get are working fine, but when I want to perform Update and Delete getting some error messages (Here update purpose using 'upsert','replace' are used) like:
TypeError:无法读取未定义的属性替换"
TypeError: Cannot read property 'replace' of undefined
这是代码:
db.js
db.js
// Instantiate Couchbase and Ottoman
var couchbase=require('couchbase');
var ottoman=require('ottoman');
// Build my cluster object and open a new cluster
var myCluster = new couchbase.Cluster('localhost:8091');
var myBucket = myCluster.openBucket('default');
ottoman.bucket=myBucket;
require('./model/user');
ottoman.ensureIndices(function(){});
user.js
user.js
var db = require('./../db.js').myBucket;
var ottoman = require('ottoman');
var userMdl = ottoman.model('User', {
firstName: {type:'string'},
lastName: {type:'string'},
created: {type: 'Date', default:function(){return new Date()}},
email:'string',
phone: 'string'
},{
index: {
findByID: {
by: '_id'
},
}
})
module.exports = userMdl;
routes.js
routes.js
var bodyParser = require('body-parser');
var db = require('../schema/db').myBucket;
var user=require('../schema/model/user');
var jsonParser = bodyParser.json();
var urlencodedParser = bodyParser.urlencoded({ extended: false });
module.exports = function (app) {
// Delete a record
app.post("/api/delete/:_id", function(req, res) {
console.log("_id:"+req.params._id)
if(!req.params._id) {
return res.status(400).send({"status": "error", "message": "A document id is required"});
}
db.delete({_id:req.params._id}, function(error, result) {
if(error) {
return res.status(400).send(error);
}
res.send(result);
});
});
app.post('/api/user/update/:id',function(req,res){
db.replace(req.params.id,{firstName:"Mahesh"},function(err,result){
if (err) {
res.status = 400;
res.send(err);
return;
}
else {
res.status = 202;
res.send(result);
}
})
})
}
最近两天我一直被困在这里.
I am stuck here from last two days.
推荐答案
您可以使用两种方法来更新Couchbase文档,一种是 upsert
方法,第二种是 N1qlQuery
You can update Couchbase document using 2 ways 1st by upsert
method and second by N1qlQuery
bucket.upsert('user', {'name': 'Jay'}, {'expiry': 1}, function(err){
bucket.get('user', function(err, result) {
console.log('Have item: %j', result.value);
})
});
let query = N1qlQuery.fromString("UPDATE `"+BUCKETNAME+"` SET name='"+data.name+"' where _id ='"+id+"'");
bucket.query(query,(error,result)=>{
if(error){
console.log(error);
}
console.log(result);
});
您可以使用两种方法删除Couchbase文档,第一种是 Removed
方法,第二种是通过 N1qlQuery
You can delete Couchbase document using 2 ways 1st is removed
method and second by N1qlQuery
bucket.remove(id, function(error, result) {
console.log("Deleted");
});
let query = N1qlQuery.fromString("DELETE FROM `"+BUCKETNAME+"` WHERE _id = '"+id+"'");
bucket.query(query,(error,result)=>{
if(error){
console.log(error);
}
console.log(result);
})
这篇关于如何使用Couchbase和Node.js SDK在存储桶中执行更新和删除操作的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!