PouchDB Add Attachment




PouchDB Add Attachment

  • putAttachment() - This method is used to add a binary object to a document in PouchDB. Here we have to pass the document id, attachment id, MIME type along with the attachment.
  • This method takes a callback function as a optional parameter.
 PouchDB Add Attachment

PouchDB Add Attachment

Syntax

db.putAttachment(docId, attachmentId, attachment, type, [callback] );

Add Attachment Example

To create a document with an attachment in a newly created database "New_Database".

//Requiring the package   
var PouchDB = require('PouchDB');  
//Creating the database object   
var db = new PouchDB('New_Database');  
//Preparing the attachment   
var my_attachment = new Buffer(['Hello wikitechy......'], {type:'text/plain'});  
//Adding attachment to a document   
db.putAttachment('001', 'attachment1.txt', my_attachment, 'text/plain', function(err, res) {   
   if (err) {   
      return console.log(err);   
   } else {   
      console.log(res+"Attachment added successfully")   
   }   
});  
  • Save the file name as "Add_Attachment.js" within a folder name "PouchDB_Examples". Open the command prompt and execute the javascript file using node.
node Add_Attachment.js  
 PouchDB Add Attachment

PouchDB Add Attachment

Verification

//Requiring the package   
var PouchDB = require('PouchDB');  
//Creating the database object   
var db = new PouchDB('New_Database');  
//Reading the Document   
db.get('001',{attachments: true}, function(err, doc) {   
   if (err) {   
      return console.log(err);   
   } else {   
      console.log(doc);   
   }   
});  
  • Save the above code in a file named "read_doc_attach.js" within a folder name "PouchDB_Examples". Open the command prompt and execute the JavaScript file using node:
node read_doc_attach.js  
 PouchDB Add Attachment

PouchDB Add Attachment

Add attachment to an existing document

  • We have a document in database named "Last_Database" with id "002". You can see the value of the document:
{ name: 'nisha',  
  age: 21,  
  designation: 'Teacher',  
  _id: '002',  
  _rev: '1-06272bacc14146d68d8ee0c36dfa0cb9'   
}  
  • Now add an attachment to this document using its _rev value.

Example:

//Requiring the package   
var PouchDB = require('PouchDB');  
//Creating the database object   
var db = new PouchDB('Last_Database');  
//Adding attachment to existing document   
var my_attachment = new Buffer (['Hello wikitechy....'], {type: 'text/plain'});  
  
rev =’ 2-78dfc06e4badf7f2d52f3b7cff85973f’;   
db.putAttachment('002', 'attachment1.txt', rev, my_attachment, 'text/plain', function(err, res) {   
   if (err) {   
      return console.log(err);   
   } else {   
      console.log (res + "Attachment added successfully")   
   }   
});  

Save the file name as "Add_Attachment2.js" within a folder name "PouchDB_Examples". Open the command prompt and execute the javascript file using node.

node Add_Attachment2.js  

Output:

 PouchDB Add Attachment

PouchDB Add Attachment

Add Attachment to a Remote Database Example

  • Additionally we can add an attachment to a remotely stored server (CouchDB). For this purpose, You just have to pass the path to the database where you need to add your attachment in CouchDB.
  • We have a database name "employees" stored on the CouchDB server.
 PouchDB Add Attachment

PouchDB Add Attachment

Add an attachment to the document 001 stored in a database named "employees" which is stored in the CouchDB server.

//Requiring the package  
var PouchDB = require('PouchDB');  
  
//Creating the database object  
var db = new PouchDB('http://localhost:5984/employees');  
  
//Adding attachment to existing document  
var my_attachment = new Buffer (['Hello wikitechy'], {type: 'text/plain'});  
  
rev = '2-7258b5c92fedd3894ca53f15eb647e39';  
db.putAttachment('001', 'att_1.txt',rev, my_attachment, 'text/plain', function(err, res) {  
   if (err) {  
      return console.log(err);  
   } else {  
      console.log (res+ "Attachment added successfully")  
   }  
});  

Save the above code in a file named "Add_Remote_Attachment.js" within a folder name "PouchDB_Examples". Open the command prompt and execute the JavaScript file using node:

 PouchDB Add Attachment

PouchDB Add Attachment

Verification

Go to CouchDB server and we can see that attachment is added with the document.

 PouchDB Add Attachment


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