better-sqlite3-helper

    3.1.5 • Public • Published

    better-sqlite3-helper

    A nodejs wrapper library for the work with better-sqlite3 ("The fastest and simplest library for SQLite3 in Node.js"). It's intended for simple server-apps for nodejs and offer some new functions and a migration-system.

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    New in Version 3.0

    better-sqlite3 Version 7 is now used. This means that the option "memory" is removed (use path :memory: instead - worked in version 2 too) and support for Node.js versions < 10 is dropped. For older node versions you can continue using version 2 of this library.

    New in Version 2.0

    All commands of better-sqlite3 Version 5 (like function and backup) can now be used too. Commands for Version 4 are removed. In addition there is now a TypeScript Declaration File for this library.

    How to install

    Install it for example with

    npm i better-sqlite3-helper

    How to use

    In every file you want access to a sqlite3 database simply require the library and use it right away.

    anyServerFile.js
    const DB = require('better-sqlite3-helper');
    
    let row = DB().queryFirstRow('SELECT * FROM users WHERE id=?', userId);
    console.log(row.firstName, row.lastName, row.email);

    To setup your database, create a sql-file named 001-init.sql in a migrations-directory in the root-directory of your program.

    ~/migrations/001-init.sql
    -- Up
    CREATE TABLE `users` (
      id INTEGER PRIMARY KEY,
      firstName TEXT NOT NULL,
      lastName TEXT NOT NULL,
      email TEXT NOT NULL
    );
    
    -- Down
    DROP TABLE IF EXISTS `users`;

    And that's it!

    One global instance

    A normal, simple application is mostly working with only one database. To make the class management more easy, this library does the access-control for you - mainly as a singleton. (But you can create a new instance to access other databases.)

    The database loads lazy. Only when it's used for the first time, the database is read from the file, the migration is started and the journal-mode WAL is set. The default directory of the database is './data/sqlite3.db'.

    If you want to change the default-values, you can do this by calling the library once in the beginning of your server-code and thus setting it up:

    index.js
    const DB = require('better-sqlite3-helper');
    
    // The first call creates the global instance with your settings
    DB({
      path: './data/sqlite3.db', // this is the default
      readonly: false, // read only
      fileMustExist: false, // throw error if database not exists
      WAL: true, // automatically enable 'PRAGMA journal_mode = WAL'
      migrate: {  // disable completely by setting `migrate: false`
        force: false, // set to 'last' to automatically reapply the last migration-file
        table: 'migration', // name of the database table that is used to keep track
        migrationsPath: './migrations' // path of the migration-files
      }
    })

    After that you can use the library without parameter:

    anotherAPIFile.js
    const DB = require('better-sqlite3-helper');
    
    // a second call directly returns the global instance
    let row = DB().queryFirstRow('SELECT * FROM users WHERE id=?', userId);
    console.log(row.firstName, row.lastName, row.email);

    New Functions

    This class implements shorthand methods for better-sqlite3.

    // shorthand for db.prepare('SELECT * FROM users').all();
    let allUsers = DB().query('SELECT * FROM users');
    // result: [{id: 1, firstName: 'a', lastName: 'b', email: 'foo@b.ar'},{},...]
    // result for no result: []
    
    // shorthand for db.prepare('SELECT * FROM users WHERE id=?').get(userId);
    let row = DB().queryFirstRow('SELECT * FROM users WHERE id=?', userId);
    // result: {id: 1, firstName: 'a', lastName: 'b', email: 'foo@b.ar'}
    // result for no result: undefined
    
    // shorthand for db.prepare('SELECT * FROM users WHERE id=?').get(999) || {};
    let {id, firstname} = DB().queryFirstRowObject('SELECT * FROM users WHERE id=?', userId);
    // result: id = 1; firstName = 'a'
    // result for no result: id = undefined; firstName = undefined
    
    // shorthand for db.prepare('SELECT * FROM users WHERE id=?').pluck(true).get(userId);
    let email = DB().queryFirstCell('SELECT email FROM users WHERE id=?', userId);
    // result: 'foo@b.ar'
    // result for no result: undefined
    
    // shorthand for db.prepare('SELECT * FROM users').all().map(e => e.email);
    let emails = DB().queryColumn('email', 'SELECT email FROM users');
    // result: ['foo@b.ar', 'foo2@b.ar', ...]
    // result for no result: []
    
    // shorthand for db.prepare('SELECT * FROM users').all().reduce((o, e) => {o[e.lastName] = e.email; return o;}, {});
    let emailsByLastName = DB().queryKeyAndColumn('lastName', 'email', 'SELECT lastName, name FROM users');
    // result: {b: 'foo@b.ar', c: 'foo2@b.ar', ...}
    // result for no result: {}

    Insert, Update and Replace

    There are shorthands for update, insert, replace and delete. They are intended to make programming of CRUD-Rest-API-functions easier. With a blacklist or a whitelist it's even possible to send a request's query (or body) directly into the database.

    Update

    // const numberOfChangedRows = DB().update(table, data, where, whitelist = undefined)
    
    // simple use with a object as where and no whitelist
    DB().update('users', {
      lastName: 'Mustermann',
      firstName: 'Max'
    }, {
      email: 'unknown@emailprovider.com'
    })
    
    // data from a request and a array as a where and only editing of lastName and firstName is allowed
    DB().update('users', req.body, ['email = ?', req.body.email], ['lastName', 'firstName'])
    
    
    // update with blacklist (id and email is not allowed; only valid columns of the table are allowed) and where is a shorthand for ['id = ?', req.body.id]
    DB().updateWithBlackList('users', req.body, req.body.id, ['id', 'email'])

    Insert and replace

    // const lastInsertID = DB().insert(table, datas, whitelist = undefined)
    // const lastInsertID = DB().replace(table, datas, whitelist = undefined)
    
    // simple use with an object and no whitelist
    DB().insert('users', {
      lastName: 'Mustermann',
      firstName: 'Max',
      email: 'unknown@emailprovider.com'
    })
    
    // inserting two users
    DB().insert('users', [{
      lastName: 'Mustermann',
      firstName: 'Max',
      email: 'unknown@emailprovider.com'
    }, {
      lastName: 'Mustermann2',
      firstName: 'Max2',
      email: 'unknown2@emailprovider.com'
    }])
    
    // data from a request and only lastName and firstName are set
    DB().replace('users', req.body, ['lastName', 'firstName'])
    
    
    // replace with blacklist (id and email is not allowed; only valid columns of the table are allowed)
    DB().replaceWithBlackList('users', req.body, ['id', 'email']) // or insertWithBlackList

    Delete

    //delete the user with an id of 4
    DB().delete('users', {id: 4})

    Try and catch

    If you want to put invalid values into the database, the functions will throw an error. So don't forget to surround the functions with a try-catch. Here is an example for an express-server:

    const { Router } = require('express')
    const bodyParser = require('body-parser')
    const DB = require('better-sqlite3-helper')
    
    router.patch('/user/:id', bodyParser.json(), function (req, res, next) {
      try {
        if (!req.params.id) {
          res.status(400).json({error: 'missing id'})
          return
        }
        DB().updateWithBlackList(
          'users',
          req.body,
          req.params.id,
          ['id']
        )
    
        res.statusCode(200)
      } catch (e) {
        console.error(e)
        res.status(503).json({error: e.message})
      }
    })

    Migrations

    The migration in this library mimics the migration system of the excellent sqlite by Kriasoft.

    To use this feature you have to create a migrations-directory in your root. Inside you create sql-files that are separated in a up- and a down-part:

    migrations/001-initial-schema.sql
    -- Up
    CREATE TABLE Category (id INTEGER PRIMARY KEY, name TEXT);
    CREATE TABLE Post (id INTEGER PRIMARY KEY, categoryId INTEGER, title TEXT,
      CONSTRAINT Post_fk_categoryId FOREIGN KEY (categoryId)
        REFERENCES Category (id) ON UPDATE CASCADE ON DELETE CASCADE);
    INSERT INTO Category (id, name) VALUES (1, 'Business');
    INSERT INTO Category (id, name) VALUES (2, 'Technology');
    
    -- Down
    DROP TABLE Category
    DROP TABLE Post;
    migrations/002-missing-index.sql
    -- Up
    CREATE INDEX Post_ix_categoryId ON Post (categoryId);
    
    -- Down
    DROP INDEX Post_ix_categoryId;

    The files need to be numbered. They are automatically executed before the first use of the database.

    NOTE: For the development environment, while working on the database schema, you may want to set force: 'last' (default false) that will force the migration API to rollback and re-apply the latest migration over again each time when Node.js app launches. See "Global Instance".

    You can also give an array of changes.

    const DB = require('better-sqlite3-helper')
    
    const db = new DB({
      migrate: {
        migrations: [
          `-- Up
          CREATE TABLE Setting (
            key TEXT NOT NULL UNIQUE,
            value BLOB,
            type INT NOT NULL DEFAULT 0,
            PRIMARY KEY(key)
          );
          CREATE INDEX IF NOT EXISTS Setting_index_key ON Setting (key);
    
          -- Down
          DROP INDEX IF EXISTS Setting_index_key;
          DROP TABLE IF EXISTS Setting;
          `,
          `-- Up
          INSERT INTO Setting (key, value, type) VALUES ('test', 'now', 0);
          INSERT INTO Setting (key, value, type) VALUES ('testtest', 'nownow', 6);
    
          -- Down
          DELETE FROM Setting WHERE key = 'test';
          DELETE FROM Setting WHERE key = 'testtest';
          `
        ]
      }
    })

    More Documentation of better-sqlite3

    License

    MIT

    Install

    npm i better-sqlite3-helper

    DownloadsWeekly Downloads

    54

    Version

    3.1.5

    License

    MIT

    Unpacked Size

    50 kB

    Total Files

    6

    Last publish

    Collaborators

    • kauto