![node js sqlite node js sqlite](https://i.imgur.com/aR77Z7g.png)
![node js sqlite node js sqlite](https://i.ytimg.com/vi/DRx6_gUnNio/maxresdefault.jpg)
Just like we saw above, the function we're defining here will need to be prefixed with async so we can safely use the await keyword without triggering a JavaScript error. Like the name implies, our goal will be to check if our posts table is empty, and if it is, insert some test data for us to read. To do it, we're going to add another function above our call to db.serialize() called createPostsIfEmpty(). Next, with our table, we want to create some test data. Import ")`, 'run') Īwait query("CREATE TABLE IF NOT EXISTS posts (date text, title text, author text, content text, tags text)", 'run') We want to do this because by default the package uses a callback pattern (which can lead to messy code). Creating a promise wrapperīefore we get into creating our data, to make our work easier, we're going to quickly write a wrapper function that gives us a promised version of the sqlite3 driver.
NODE JS SQLITE DRIVER
In the event that this database (a file at the root of our project) does not exist, the driver will create it for us. Here, posts.db is the name of the database we want to connect to. Next, with our class, we create one more variable db which gives us access to our actual instance/connection to our database by calling new SQLite3.Database('posts.db').
NODE JS SQLITE FULL
This is getting us a copy of the class we'll use to start the driver in verbose mode which means that it will include the full stack trace for any errors it encounters (helpful for debugging). Next, we create a new variable SQLite3 (we use this casing because we expect to receive a JavaScript Class in return-this casing is a common pattern for signifying that) which is assigned to a call to sqlite3.verbose(). Keep in mind: this is the driver package (what we use to communicate with the database) and not SQLite itself. First, up top, we need to import sqlite3 from the package we installed earlier via NPM. Let's get started by wiring up a connection to a database (if it doesn't exist, our driver will create it for us) and then add a table to it.Ĭonst db = new SQLite3.Database('posts.db')
![node js sqlite node js sqlite](https://i.ytimg.com/vi/5b1foB552R0/maxresdefault.jpg)
The most popular option for this type of database is SQLite. These are databases that do not require a server to function, meaning they can run in resource-limited environments (e.g., a Raspberry Pi). To combat this, we have a different form of database known as an embedded database. In some cases, though, these sorts of databases are problematic, namely, when you're trying to keep as light a footprint as possible or limit the number of "expensive" (in terms of CPU and memory) processes running alongside your application.
![node js sqlite node js sqlite](https://i.imgur.com/yDRh7nd.png)
In order for these databases to work, though, they need a database server: a long-running process that handles inbound connections.įor a full-blown application, these sorts of databases are helpful because they offer a rich feature set and allow you to manage significant amounts of data. When most people think of a database, they think of something that writes and retrieves data from the disk (like PostgreSQL), or, directly from memory (like Redis). With that in place, we're ready to get started.
NODE JS SQLITE CODE
This will enable ESModules support and allow us to use the import statements shown in the code below. One last step: in the package.json file that was created for you, make sure to add the field "type": "module" as a property. The first will give us access to a Node.js driver for SQLite (what we'll use to connect to the database in our code), while the second will help us generate some test data to insert into our database.
NODE JS SQLITE INSTALL
Next, we want to install two extra dependencies, sqlite3 and lorem-ipsum: Next, cd into that directory and create an index.js file (this is where we'll write our code for the tutorial): Once you have Node.js installed on your computer, from your projects folder on your computer (e.g., ~/projects), create a new folder for our work: If you don't already have Node.js installed on your computer, read this tutorial first and then come back here. Because the code we're writing for this tutorial is "standalone" (meaning it's not part of a bigger app or project), we're going to create a Node.js project from scratch.