How To Connect Mysql Database In Typescript

There are many different ways to connect to a MySQL database in Typescript, depending on the specific needs of your project. In this tutorial, we will guide you through the process of setting up a basic connection to a MySQL database in a Typescript project.

Step 1: Install the Required Packages

The first step is to install the required packages for connecting to a MySQL database. Open your command line interface and navigate to your Typescript project folder. Then, type the following command and hit enter:

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npm install --save mysql

This will install the MySQL library, which we will use to establish a connection to the database.

Step 2: Set Up Database Credentials

Before we can connect to the database, we need to specify the credentials for our MySQL server. Create a new file called dbconfig.ts in your Typescript project folder and add the following code:

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export const dbConfig = {
    host: 'localhost',
    user: 'username',
    password: 'password',
    database: 'mydatabase'
};

Be sure to replace the values for user, password, and database with your own values, depending on your MySQL server setup.

Step 3: Create a Connection Pool

To connect to the database, we will create a connection pool. A connection pool is a group of database connections that can be used and reused by different parts of your code as needed. Add the following code to your app.ts file to create a connection pool:

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import * as mysql from 'mysql';
import { dbConfig } from './dbconfig';
 
const pool = mysql.createPool(dbConfig);

Note that we are importing the mysql library and the dbConfig object we defined earlier. We are then using the createPool() method to create a new connection pool with the specified configuration.

Step 4: Test the Connection

To test that the connection is working, let’s query the database for some data. Add the following code to your app.ts file:

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pool.query("SELECT * FROM mytable", (err, rows) => {
    if (err) throw err;
    console.log(rows);
});

This code sends a query to the database to select all rows from the mytable table. If no error occurs, the result is logged to the console.

Step 5: Start the Application

Now that we have set up the connection pool and tested the connection, we can start running our Typescript application. Make sure you have compiled your code to Javascript and then run the following command in your command line interface:

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node app.js

This will start your Typescript application and establish a connection to the MySQL database using the connection pool we created earlier.

Conclusion

In this tutorial, we have shown you how to set up a basic connection to a MySQL database in a Typescript application. By following these steps, you can easily establish a connection to any MySQL server and begin querying data from your databases.

At the top of your Typescript files, make sure to import the required library and the dbConfig object:

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import * as mysql from 'mysql';
import { dbConfig } from './dbconfig';

Then, use the createPool() method to create a connection pool:

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const pool = mysql.createPool(dbConfig);

Finally, query the database for data and use the results in your application:

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pool.query("SELECT * FROM mytable", (err, rows) => {
    if (err) throw err;
 
    console.log(rows);
});

With these steps, you can easily connect to and query data from any MySQL database in your Typescript projects.

Full code:

dbconfig.ts:

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export const dbConfig = {
    host: 'localhost',
    user: 'username',
    password: 'password',
    database: 'mydatabase'
};

app.ts:

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import * as mysql from 'mysql';
import { dbConfig } from './dbconfig';
 
const pool = mysql.createPool(dbConfig);
 
pool.query("SELECT * FROM mytable", (err, rows) => {
    if (err) throw err;
 
    console.log(rows);
});