You can update an array of documents in PouchDB at once using the bulkDocs() method. To do so you need to create an array of documents where, each document contains _id, _rev and the values that are to be updated.

Suppose the database named my_database that is stored locally in PouchDB contains 3 documents namely doc1, doc2, doc3 with the following contents.

doc1 = {_id: ''001'', name: ''Ram'', age: 23, Designation: ''Programmer''}
doc2 = {_id: ''002'', name: ''Robert'', age: 24, Designation: ''Programmer''}
doc3 = {_id: ''003'', name: ''Rahim'', age: 25, Designation: ''Programmer''}

Suppose we have to increase the age values in all the 3 documents by 2 years. For this to happen, first you need to get the _rev values. Therefore, fetch the contents of these documents using the following code.

//Requiring the package
var PouchDB = require(''PouchDB'');

//Creating the database object
var db = new PouchDB(''my_database'');

//Retrieving all the documents in PouchDB
db.allDocs({include_docs: true},function(err, docs) {
   if (err) {
      return console.log(err);
   } else {
      console.log(docs.rows);
   }
});

Save the above code as bulk_fetch.js. On executing, the above program gives you the _id and _rev values of the documents in the database as shown below.

[ 
   { 
      id: ''001'',
      key: ''001'',
      value: { rev: ''1-1604b0c3ff69dc1e261265fd60808404'' } 
   },
   { 
      id: ''002'',
      key: ''002'',
      value: { rev: ''1-b5e49db7e984841bf12a13e3ee548125'' } 
   },
   { 
      id: ''003'',
      key: ''003'',
      value: { rev: ''1-a7b342786ecc707aa91f3b321a177b51'' } 
   } 
]

Now, you can update the documents using their respective _id and _rev values as shown below.

//Requiring the package
var PouchDB = require(''PouchDB'');

//Creating the database object
var db = new PouchDB(''my_databas'');

//Preparing the document
docs = [{_id : ''001'', _rev: ''1-1604b0c3ff69dc1e261265fd60808404'', age : 25, },
      {_id : ''002'', _rev: ''1-b5e49db7e984841bf12a13e3ee548125'', age : 26, },
      {_id : ''003'', _rev: ''1-a7b342786ecc707aa91f3b321a177b51'', age : 27 }]

//Updating the documents in bulk
db.bulkDocs(docs, function(err, response) {
   if (err) {
      return console.log(err);
   } else {
      console.log("Documents Updated Successfully");
   }
});

Save the above code in a file with the name Update_All_Document.js. Open the command prompt and execute the JavaScript file using node as shown below.

C:PouchDB_Examples >node Update_All_Document.js

This updates all the documents that exists in the database named my_database which is stored locally, displaying the following message.

Documents Updated Successfully

Now, if you execute the bulk_fetch.js program by adding {include_docs: true} as a parameter to allDocs() function, before the callback, then, you will can see the values of the documents updated, as shown below.

[ 
   { 
      id: ''001'',
      key: ''001'',
      value: { rev: ''2-77f3a9974dd578d12f3f2a33aae64c8d'' },
      doc: { 
         age: 25,
         _id: ''001'',
         _rev: ''2-77f3a9974dd578d12f3f2a33aae64c8d'' 
      } 
   },
   { 
      id: ''002'',
      key: ''002'',
      value: { rev: ''2-43966007568ce9567c96422195fcfa0d'' },
      doc: { 
         age: 26,
         _id: ''002'',
         _rev: ''2-43966007568ce9567c96422195fcfa0d'' 
      } 
   },
   { 
      id: ''003'',
      key: ''003'',
      value: { rev: ''2-6c5349652527f4f39583ff14f23cd677'' },
      doc: { 
         age: 27,
         _id: ''003'',
         _rev: ''2-6c5349652527f4f39583ff14f23cd677'' 
      } 
   } 
]

Updating Batch from a Remote Database

You can update all the documents from the database that is stored remotely on the server (CouchDB).

To do so, instead of a database name, you need to pass the path to the database in CouchDB, which contains the document that is to be read.

Example

Suppose there is a database named my_database in the CouchDB server. Then, if you verify the list of databases in CouchDB using the URL http://127.0.0.1:5984/_utils/index.html you will get the following screenshot.

And assume if we select the database named my_database, you can observe that it contains 3 documents as shown in the following screenshot.

Now, fetch the contents of these documents using the following code.

//Requiring the package
var PouchDB = require(''PouchDB'');

//Creating the database object
var db = new PouchDB(''http://localhost:5984/my_database'');

//Retrieving all the documents in PouchDB
db.allDocs({include_docs: true}, function(err, docs) {
   if (err) {
      return console.log(err);
   } else {
      console.log(docs.rows);
   }
});

Save the above code as remote_bulk_fetch.js. On executing, the above program gives you the contents of all the documents in the database as shown below.

[ 
   { 
      id: ''001'', 
      key: ''001'', 
      value: { rev: ''3-552920d1ca372986fad7b996ce365f5d'' }, 
      doc: { 
         _id: ''001'', 
         _rev: ''3-552920d1ca372986fad7b996ce365f5d'', 
         name: ''Raju'', 
         age: 23, 
         designation: ''Designer'' 
      } 
   },
   { 
      id: ''002'', 
      key: ''002'', 
      value: { rev: ''1-9af15cb11054ebe03a7816bf6c5e4128'' }, 
      doc: { 
         _id: ''002'', 
         _rev: ''1-9af15cb11054ebe03a7816bf6c5e4128'', 
         name: ''Robert'', 
         age: 24, 
         Designation: ''Programmer'' 
      } 
   }, 
   { 
      id: ''003'', 
      key: ''003'', 
      value: { rev: ''1-3033b5a78e915c52fd37325d42eb3935'' }, 
      doc: { 
         _id: ''003'',
         _rev: ''1-3033b5a78e915c52fd37325d42eb3935'',
         name: ''Rahim'', 
         age: 25, 
         Designation: ''Programmer'' 
      } 
   } 
]

Following is an example of updating all the documents that exists in a database named my_database 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/my_database''); 

//Preparing the document 
docs = [{_id : ''001'', _rev: ''3-552920d1ca372986fad7b996ce365f5d'', age : 24, }, 
      {_id : ''002'', _rev: ''1-9af15cb11054ebe03a7816bf6c5e4128'', age : 26, }, 
      {_id : ''003'', _rev: ''1-3033b5a78e915c52fd37325d42eb3935'', age : 27}]

//Inserting Document 
db.bulkDocs(docs, function(err, response) { 
   if (err) { 
      return console.log(err); 
   } else { 
      console.log(+"Documents Updated Successfully"); 
   } 
});

Save the above code in a file with the name Remote_Update_Document.js. Open the command prompt and execute the JavaScript file using node as shown below.

C:PouchDB_Examples >node Remote_Update_Document.js

This updates the contents of all given document that exists in the database named my_database which is stored in CouchDB, and displays the following message.

Documents Updated Successfully

Now, if you execute the remote_bulk_fetch.js program you will can see the values of the documents updated, as shown below.

[ 
   { 
      id: ''001'',
      key: ''001'',
      value: { rev: ''4-6bc8d9c7a60fed2ed1667ec0740c1f39'' },
      doc: { 
         _id: ''001'',
         _rev: ''4-6bc8d9c7a60fed2ed1667ec0740c1f39'',
         age: 25 
      } 
   },
   { 
      id: ''002'',
      key: ''002'',
      value: { rev: ''2-1aa24ce77d96bb9d2a0675cdf1e113e0'' },
      doc: { 
         _id: ''002'',
         _rev: ''2-1aa24ce77d96bb9d2a0675cdf1e113e0'',
         age: 26 
      } 
   },
   { 
      id: ''003'',
      key: ''003'',
      value: { rev: ''2-fa113149ba618eda77f73072974a2bc1'' },
      doc: { 
         _id: ''003'',
         _rev: ''2-fa113149ba618eda77f73072974a2bc1'',
         age: 27 
      } 
   } 
]