PouchDB Update Batch
PouchDB Update Batch
- bulkDocs() - It is used to update an array of documents in PouchDB .
- To update a batch, we have to create an array of documents which contains _id, _rev and the values that we need to update.
{
id: '001',
key: '001',
value: { rev: '5-2cc59b86dde184268217fcb584dd7b5e' },
doc: {
name: 'reema',
age: 24,
Designation: 'Teacher',
_id: '001',
_rev: '5-2cc59b86dde184268217fcb584dd7b5e'
}
},
{
id: '002',
key: '002',
value: { rev: '1-e31c2a8d36ab9aac248fa9c168bfb5f1' },
doc: {
name: 'Ram',
age: 25,
Designation: 'Designer',
_id: '002',
_rev: '1-e31c2a8d36ab9aac248fa9c168bfb5f1'
}
},
{
id: '003',
key: '003',
value: { rev: '1-13ed46f3c354dde6ee6e38cca78cff0d' },
doc: {
name: 'pravin',
age: 26,
Designation: 'Engineer',
_id: '003',
_rev: '1-13ed46f3c354dde6ee6e38cca78cff0d'
}
}
- Let's update the documents using their individual_id and _rev values:
- Change the name and age of all three documents:
//Requiring the package
var PouchDB = require('PouchDB');
//Creating the database object
var db = new PouchDB('Second_Database');
//Preparing the document
docs = [{_id : '001', _rev:'4-f59034f061004dbca22da61662459a16', age : 21, name: 'admin', },
{_id : '002', _rev: ‘1 -e31c2a8d36ab9aac248fa9c168bfb5f1'', age : 26, name: 'nisha', },
{_id : '003', _rev: '1-13ed46f3c354dde6ee6e38cca78cff0d', age : 19, name: 'asha', }]
//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 file name as "Update_Batch2.js " within a folder name "PouchDB_Examples". Open the command prompt and execute the JavaScript file.
node Update_Batch2.js
Output
PouchDB Update Batch
Verification
- We can verify that the batch is updated by using node (Read_Batch) command:
PouchDB Update Batch
Update Batch in Remote Database
Additionally we can update an array of documents in a database that is stored remotely on a server (CouchDB). For this purpose, You just have to pass the path to the database where you want to update the documents in CouchDB.
- We have a database named "employees" in the CouchDB Server.
PouchDB Update Batch
- There are three documents in "employees" database
PouchDB Update Batch
- You can fetch these documents by using node (Read_Remote_Batch.js) command.
- Now update all the documents name and age of "employees" database stored on CouchDB Server.
//Requiring the package
varPouchDB = require('PouchDB');
//Creating the database object
vardb = new PouchDB('http://localhost:5984/employees');
//Preparing the document
docs = [{_id : '001', _rev:'4-1e412fc629671f09383beea7c3317393', age : 20, name: 'Reena' },
{_id : '002', _rev: '1-25ce5cbb5339b299077f98e6f5baea83', age : 21,
name: 'ram' },
{_id : '003', _rev: '1-4a57a26b5b02ac80bd823a18cd191df1', age : 22,
name: 'pravin'}]
//Inserting Document
db.bulkDocs(docs, function(err, response) {
if (err) {
return console.log(err);
} else {
console.log(+"Documents Updated Successfully");
}
});
- Save the file name as "Update_Remote_Batch.js" within a folder name "PouchDB_Examples". Open the command prompt and execute the javascript file using node.
node Update_Remote_Batch.js
- It will update the documents in "employees" database.
Verification
- You can verify that the batch is updated by using node (Read_Remote_Batch) command:
PouchDB Update Batch