NQRDB

NQRDB is a simple and versatile JSON-based database class for Node.js. It allows for CRUD operations, querying, and various utility functions on a JSON file used as a database.

Installation

To use NQRDB, you need to have Node.js installed. Install the package using npm:

npm install nqrdb

Usage

Here's a quick overview of how to use NQRDB:

Initialization

import NQRDB from 'nqrdb';

// Create an instance of the database, with an optional file name.
const db = new NQRDB('mydatabase.json');

Basic Operations

• Set a value:

  db.set('key', 'value');

• Fetch a value:

  const value = db.fetch('key');

• Update a value:

  db.update('key', 'newValue');

• Delete a key:

  db.delete('key');

• Check if a key exists:

  const exists = db.has('key');

Advanced Operations

• Increment a numeric value:

  db.add('numericKey', 10);

• Decrement a numeric value:

  db.subtract('numericKey', 5);

• Perform mathematical operations:

  db.math('numericKey', '+', 10); // Adds 10
  db.math('numericKey', '-', 5);  // Subtracts 5

• Filter entries:

  const results = db.filter((key, value) => value > 10);

• Map entries:

  const mapped = db.map((key, value) => value * 2);

• Clone the database:

  db.clone('newDatabase');

• Merge databases:

  db.mergeAll('otherDatabase1.json', 'otherDatabase2.json');

• Backup the database:

  db.backup('backup');

Error Handling

NQRDB uses custom error handling with the NQRError class and various error codes. Refer to the ERROR_CODES enum for details on error types.

API

Methods

• size - Returns the number of keys in the database.
• keys() - Returns an array of all keys.
• values() - Returns an array of all values.
• filter(callback) - Filters entries based on a callback.
• map(callback) - Maps entries based on a callback.
• find(callback) - Finds an entry based on a callback.
• some(callback) - Checks if any entry matches a callback.
• every(callback) - Checks if all entries match a callback.
• countBy(callback) - Counts entries matching a callback.
• updater(key, updater) - Updates a value using a callback function.
• update(key, value) - Updates a value directly.
• removeByValue(value) - Removes entries matching a value.
• clone(newKey, [keyToClone]) - Clones data to a new key.
• rename(oldKey, newKey) - Renames a key.
• toggle(key) - Toggles a boolean value.
• mergeAll(...filePaths) - Merges multiple databases.
• pluck(key) - Extracts values by a key.
• set(key, value) - Sets a value.
• fetch(key) - Fetches a value.
• has(key) - Checks if a key exists.
• delete(key) - Deletes a key.
• fetchAll() - Retrieves all data.
• backup(fileName) - Backs up the database.
• add(key, value) - Increments a numeric value.
• subtract(key, value) - Decrements a numeric value.
• reset() - Clears all data.
• all(limit) - Retrieves all entries with an optional limit.
• push(key, value) - Appends a value to an array.
• math(key, operation, value) - Performs a mathematical operation.
• merge(key, data) - Merges data with an existing key.
• clear(key) - Clears an array or object.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Contributing

Feel free to open issues or submit pull requests if you want to contribute to NQRDB.