![]() Deleting data from a table – show you how to delete data from a table. ![]() Updating data – covers the steps of updating data in a table.Inserting data into a table – shows you how to insert one or more rows into a table.Controlling the execution flow of statements – explains the steps of executing multiple SQL statements in serialized mode or in parallel mode.Querying data from tables – introduces you to various methods for querying data from tables.Connecting to an SQLite3 database – shows you how to connect to an in-memory database or a file-based database.To understand how the sqlite3 module works, you can use the following tutorials in sequence: Control the query execution flow, supporting both serialized and parallel modes.The sqlite3 module is actively maintained and provides a rich set of features: In addition, you will learn how to execute SQL statements in serialized mode or in parallel mode. After the tutorial, you will know how to open a database connection and perform common database operations such as select, insert, update, and delete. For this I will again be using the n(.) method in conjunction with new delete methods for both the ProjectRepository and TaskRepository classes.įor ProjectRepository this looks like this: // project_repository.In this section, you will learn how to interact with SQLite databases from a Node.js application using the sqlite3 module. ![]() The last mutational functionality to implement is to provide the ability to delete records from the database. This.db = new sqlite3.Database(dbFilePath, ( err) => = task dao.js const sqlite3 = require( 'sqlite3') After that I will scaffold out a data access class called AppDAO that will establish a connection to the database inside a constructor and assign it to a member field called db. ![]() Inside dao.js, I will add imports for sqlite3 and Bluebird's Promise objects. To start I will need to make a main.js file along with a dao.js (or Data Access Object) file in the same directory as the package.json file. Ok, now that I know what I need to create I can now translate that into code. For the rest I will just use a little intuition, some made up test data, and roll with it (a common work characteristic for most developers). It is clear that I will need a projects table as well as a tasks table. With the business rules stated I can take that info and start designing the necessary tables and their fields. Each project can have one or more tasks to complete.That is all performed via a routine exported by sqlite3. The most fundamental part is the loading of the WASM-compiled form of the library and initialization of its JavaScript binding. The basic business rules for this application's data access layer are as follows: With the HTML out of the way, we need our JavaScript application. For this article I am going with the assumption that I am building out the data access layer for a project and task tracking application. Designing the DatabaseĪs with almost every one of my other articles I will be using a made up application to help describe some of the important aspects of database programming with Node.js and SQLite. I will now create an empty file right next to the package.json file called database.sqlite3 that SQLite will store data in. In addition to sqlite3 I am going to install Bluebird so that I can use the familiar promise functionality in my database programming. Next I will need to install sqlite3 package via npm like so: $ npm install -save sqlite3 "test": "echo \"Error: no test specified\" & exit 1" "description": "Code for tutorial blog on node and sqlite", Save it as a dependency in the package.json file.ĭescription: Code for tutorial blog on node and sqliteĪbout to write to /node-sqlite/app/package.json: Use `npm install -save` afterwards to install a package and See `npm help json` for definitive documentation on these fields It only covers the most common items, and tries to guess sane defaults. This utility will walk you through creating a package.json file. This SQLite tutorial is designed for developers who want to use SQLite as the back-end database or to manage structured data in applications, including desktop, web, and mobile apps SQLite is an open-source, zero-configuration, self-contained, stand-alone. I will begin by creating a new npm package using npm init inside an empty directory called node-sqlite-tutorial. In this tutorial, you will learn SQLite step by step through extensive hands-on practice. For those not familiar with SQLite, it is a simple single file relational database that is very popular among smart devices, embedded systems, and even small web application. In this tutorial I will be demonstrating how to use SQLite in combination with JavaScript inside the Node.js environment with the help of the sqlite3 Node.js driver.
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