MySQL Spring Boot Application Properties - SQL

Introduction

In any web application, the database is an essential component that stores and manages data. MySQL is one of the most popular open-source relational databases used in web development. Spring Boot is a widely-used framework for building Java applications. Combining these two technologies can result in a highly performant and scalable web application.

This guide will cover the configuration of MySQL in a Spring Boot application. We will explore the various properties that can be set in the application.properties file to establish a connection to a MySQL database and perform SQL operations.

Setup

To follow along with this guide, you will need the following:

• Java 8+ installed on your machine
• A MySQL server installed and running
• A Spring Boot project set up

Configuration

Setting up the Database Connection

To connect to a MySQL database, we need to set the following properties in the application.properties file:

spring.datasource.url=jdbc:mysql://localhost:3306/mydatabase
spring.datasource.username=root
spring.datasource.password=password
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

The spring.datasource.url property specifies the URL of our MySQL database, where mydatabase is the name of the database. If using a different port or IP address, make sure to update the URL accordingly.

The spring.datasource.username and spring.datasource.password properties specify the credentials used to connect to the database. Change these to the appropriate values.

Finally, the spring.datasource.driver-class-name property specifies the class name of the JDBC driver to use. In our case, we are using the MySQL JDBC driver.

Performing SQL Operations

Once the database connection is established, we can perform SQL operations using Spring's JdbcTemplate class. To configure the JdbcTemplate in our Spring Boot application, we need to add the following properties to the application.properties file:

spring.datasource.hikari.maximum-pool-size=5
spring.datasource.hikari.minimum-idle=1
spring.datasource.hikari.idle-timeout=10000

The spring.datasource.hikari.maximum-pool-size property specifies the maximum number of connections allowed in the connection pool at one time. A higher value can increase the performance of our application, but be careful not to create too many connections as it can lead to server overload and slow response times.

The spring.datasource.hikari.minimum-idle property specifies the minimum number of idle connections that should be maintained in the connection pool. This helps to reduce connection latency when new connections are required.

The spring.datasource.hikari.idle-timeout property specifies the maximum amount of time a connection can remain idle in the connection pool before it is closed and replaced with a new connection.

Conclusion

In this guide, we have covered the basic configuration of MySQL in a Spring Boot application. By setting the appropriate properties in the application.properties file, we can connect to a MySQL database and perform SQL operations using Spring's JdbcTemplate class.