PouchDB Read Batch
In PouchDB, the allDocs() method is used to read or retrieve multiple or bulk documents from a database .
This method accepts an optional callback function.
Syntax:
Read Batch Example
Let’s take an example to retrieve all the documents from a database named “Second_Database” stored in PouchDB server by using db.allDocs() method. This method retrieves the batch in the form of objects.
Save the above code in a file named “Read_Batch.js” within a folder name “PouchDB_Examples”. Open the command prompt and execute the JavaScript file using node:
Output:
[ { id: '001', key: '001', value: { rev: '4-f59034f061004dbca22da61662459a16' } }, { id: '002', key: '002', value: { rev: '1-0c0628a46e404d90870f4e892dc2d900' } }, { id: '003', key: '003', value: { rev: '1-1dc4fe229a61420db2b657e8fcbbfa7d' } } ] 
Generally, by using allDocs() method you can see only the _id, key and _rev fields of each document. If you want to see the whole document in the result, you have to make the optional parameter include_docs true.
Save the above code in a file named “Read_Batch2.js” within a folder name “PouchDB_Examples”. Open the command prompt and execute the JavaScript file using node:
Output:
[ { id: '001', key: '001', value: { rev: '4-f59034f061004dbca22da61662459a16' }, doc: { name: 'Ajeet', age: 23, Designation: 'Programmer', _id: '001', _rev: '4-f59034f061004dbca22da61662459a16' } }, { id: '002', key: '002', value: { rev: '1-0c0628a46e404d90870f4e892dc2d900' }, doc: { name: 'Robert', age: 24, Designation: 'Teacher', _id: '002', _rev: '1-0c0628a46e404d90870f4e892dc2d900' } }, { id: '003', key: '003', value: { rev: '1-1dc4fe229a61420db2b657e8fcbbfa7d' }, doc: { name: 'Abdul', age: 25, Designation: 'Mechanic', _id: '003', _rev: '1-1dc4fe229a61420db2b657e8fcbbfa7d' } } ] 
Read a Batch from Remote Database
You can read a batch from a database which is stored remotely on CouchDB Server. For this, you have to pass the path of the database where you want to read the batch.
Example
We have a database named “employees” on the CouchDB Server.
Let’s read all the documents from the “employees” database stored on CouchDB Server.
Save the above code in a file named “Read_Remote_Batch.js” within a folder name “PouchDB_Examples”. Open the command prompt and execute the JavaScript file using node:
Output:
[ { id: '001', key: '001', value: { rev: '6-bc6904f9fdcf64e8bc181e7da006db45' }, doc: { _id: '001', _rev: '6-bc6904f9fdcf64e8bc181e7da006db45', name: 'Lucky', age: 24, Designation: 'Teacher' } }, { id: '002', key: '002', value: { rev: '1-415437b4fd54d2af100e2eef26e3fad7' }, doc: { _id: '002', _rev: '1-415437b4fd54d2af100e2eef26e3fad7', name: 'Raman', age: 25, Designation: 'Designer' } }, { id: '003', key: '003', value: { rev: '1-ab07c37012e837c1654c0d6b9f22a56f' }, doc: { _id: '003', _rev: '1-ab07c37012e837c1654c0d6b9f22a56f', name: 'Albert', age: 26, Designation: 'Engineer' } } ] 