Before run the project

• src/main/resources/application.properties

spring.application.name=spring-data-jpa
spring.datasource.url=jdbc:postgresql://localhost:5432/<DB_NAME>
spring.jpa.properties.hibernate.default_schema=<SCHEMA_NAME>
spring.datasource.username=<USERNAME>
spring.datasource.password=<DB_PASSWORD>

spring.jpa.hibernate.ddl-auto=create
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.format_sql=true

After creating the database, the things you need to do

• When you run the project for the first time, set spring.jpa.hibernate.ddl-auto=create. After the table is created, don't forget to change it to update or none, but I recommend using update. To prevent the added data from being deleted

spring.jpa.hibernate.ddl-auto=update