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Connecting to MySQL

MySQL is a popular relational database from Oracle. You should install MySQL separately before you can connect to it from your Vaadin application (you can also install MySQL as a Docker container).

For an existing Vaadin project, you can connect to MySQL by following the steps below:

  1. Add the mysql-connector-java dependency to the pom.xml file.

        <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <scope>runtime</scope>
    </dependency>

  2. Add MySQL configuration properties to the src/main/resources/application.properties file. You will have to replace HOST, PORT, DB_NAME, USERNAME, PASSWORD with corresponding parameters from your MySQL instance.

    # MySQL Configuration
spring.jpa.hibernate.ddl-auto=update
spring.datasource.url=jdbc:mysql://HOST:PORT/DB_NAME
spring.datasource.username=USERNAME
spring.datasource.password=PASSWORD
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
Caution
Avoid storing sensitive information in the project’s properties file.

It is bad practice to store database URI, username, and passwords in the application.properties file. You should consider externalizing these properties.

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