Update Document in PouchDB

Update Document The _rev or revision marker is used to update a document in PouchDB which is generated when a PouchDB document is created and is changed whenever a change or update is made to the document.

Example:

Read the required document and get its _rev number. Output:
{ name: 'Tom', salary: 45000, experience: 3, _id: '100', _rev: '1-99a7a70ec2a34678845637a16d57344f' }
{ name: 'Tom', salary: 45000, experience: 3, _id: '100', _rev: '1-99a7a70ec2a34678845637a16d57344f' }
Use the _rev to update the document.
Create a file named “UpdateDocument.js” within a folder named “Examples”.

Add the below code to the file.

UpdateDocument.js:

var PouchDB = require('PouchDB');
var db = new PouchDB('Example_Database');
doc = {
salary: 50000,
_id: '100',
_rev: '1-99a7a70ec2a34678845637a16d57344f'
}
db.put(doc);
db.get('100', function(err, doc) {
if (err) {
return console.log(err);
} else {
console.log(doc);
}
});

Open the command prompt.

Execute the .js file.

node UpdateDocument.js

Output:

{ salary: 50000,
_id: '100',
_rev: '2-c23478900ffg561ab723567g2be7865s' }

Explanation: The values in the document with ID “100” present in the “Example_Database” is updated and thus the document.

Update a Document in Remote Database:

Instead of the database name, pass the path of the database to update a document in CouchDB or remote server.

Example:

Read the required document and get its _rev number. Output:
{ _id: '100', _rev: '3-897c876543ad71f53b345feda12e65b1', name: 'Tom', salary: 45000, experience: 3 }
{ _id: '100', _rev: '3-897c876543ad71f53b345feda12e65b1', name: 'Tom', salary: 45000, experience: 3 }
Create a file named “UpdateRemoteDocument.js” within a folder named “Examples”.

Add the below code to the file. UpdateRemoteDocument.js:

var PouchDB = require('PouchDB');
var db = new PouchDB('http://localhost:5984/students');
doc = {
"_id": "100",
"_rev": "3-897c876543ad71f53b345feda12e65b1",
"name": "Jerry",
"salary": 60000
}
db.put(doc);
db.get('100', function(err, doc) {
if (err) {
return console.log(err);
} else {
console.log(doc);
}
});

Open the command prompt.

Execute the .js file.

node UpdateRemoteDocument.js

Output:

{ _id: '100',
_rev: '4-123agh3678975bc0d2314894dxzbab87',
name: 'Jerry',
salary: 60000 }

Explanation: The values in the document with ID “100” present in the “students” database in CouchDB is updated with PouchDB.

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