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leveldown

A low-level Node.js LevelDB binding

  • 6.1.1
  • latest
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
609K
increased by42.44%
Maintainers
3
Weekly downloads
 
Created

What is leveldown?

LevelDOWN is a Node.js binding for LevelDB, a fast key-value storage library written at Google that provides an ordered mapping from string keys to string values. It is used as a backend for the LevelUP module, which provides a more user-friendly API.

What are leveldown's main functionalities?

Open a Database

This feature allows you to open a LevelDB database. The code sample demonstrates how to open a database located at './mydb'.

const leveldown = require('leveldown');
const db = leveldown('./mydb');
db.open(function (err) {
  if (err) throw err;
  console.log('Database opened');
});

Put Data

This feature allows you to store a key-value pair in the database. The code sample shows how to store the value 'value' under the key 'key'.

db.put('key', 'value', function (err) {
  if (err) throw err;
  console.log('Data written');
});

Get Data

This feature allows you to retrieve a value by its key from the database. The code sample demonstrates how to get the value associated with the key 'key'.

db.get('key', function (err, value) {
  if (err) throw err;
  console.log('Data retrieved:', value);
});

Delete Data

This feature allows you to delete a key-value pair from the database. The code sample shows how to delete the key 'key' from the database.

db.del('key', function (err) {
  if (err) throw err;
  console.log('Data deleted');
});

Batch Operations

This feature allows you to perform multiple operations in a single batch. The code sample demonstrates how to perform a batch operation that puts and deletes multiple key-value pairs.

db.batch()
  .put('key1', 'value1')
  .del('key2')
  .put('key3', 'value3')
  .write(function (err) {
    if (err) throw err;
    console.log('Batch operations completed');
  });

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Package last updated on 25 Mar 2022

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