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You can delete a document from a database that exists in PouchDB using the db.remove() method.
Syntax
Following is the syntax of using the db.remove() method of PouchDB. To this method, we have to pass id and _rev to delete an existing document as shown in the following code. This method accepts an optional callback function. We can also pass the complete document instead of id and _rev.
db. get ( docId, docRev, [callback] ) or db. get ( docId, docRev, [callback] )
Example
Assume we have a document in PouchDB with id 001 which have the details of a person. In order to delete this document along with its id we should also have its _rev number. Therefore, retrieve the contents of the document as shown in the following code.
//Requiring the package var PouchDB = require(''PouchDB''); //Creating the database object var db = new PouchDB(''my_database''); //Reading the contents of a Document db.get(''001'', function(err, doc) { if (err) { return console.log(err); } else { console.log(doc); } });
Executing the above code gives the following output.
{ _id: ''001'', _rev: ''3-552920d1ca372986fad7b996ce365f5d'', name: ''Raju'', age: 23, designation: ''Designer'' }
Now, using the _rev and id of the document you can delete this by using the remove() method as shown in the following code.
//Requiring the package var PouchDB = require(''PouchDB''); //Creating the database object var db = new PouchDB(''my_database''); //Deleting an existing document db.remove(''001'', ''3-552920d1ca372986fad7b996ce365f5d'', function(err) { if (err) { return console.log(err); } else { console.log("Document deleted successfully"); } });
Save the above code in a file with the name Delete_Document.js. Open the command prompt and execute the JavaScript file using node as shown below.
C:PouchDB_Examples >node Delete_Document.js
This deletes the contents of the given document that exists in the database named my_database which is stored locally. The following message is displayed.
Document deleted successfully
Deleting a Document from a Remote Database
You can also delete an existing document 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.
By clicking on the database named my_database you can see the following screenshot. Here, you can observe that the database contains a document with id 001.
Following is an example of deleting the contents of the document having id “001” 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''); //Deleting an existing document db.remove(''001'', ''3-552920d1ca372986fad7b996ce365f5d'', function(err) { if (err) { return console.log(err); } else { console.log("Document deleted successfully"); } });
Save the above code in a file with name Remote_Delete_Document.js. Open the command prompt and execute the JavaScript file using node as shown below.
C:PouchDB_Examples >node Remote_Delete_Document.js
This deletes the given document that exists in the database named my_database which is stored in CouchDB. The following message is displayed.
Document deleted successfully
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