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These are links to resources that describe how to access data via queries in a Spring Boot application. The Spring repository to work with will extend the Crud repository and will include methods that have annotations such as @Query and @Modifying. The queries can use JPQL or be native SQL.
Baeldung’s Tutorial on Spring JPA Data @Query:
https://www.baeldung.com/spring-data-jpa-query
App developer’s blog on the @Query annotation
http://www.appsdeveloperblog.com/spring-data-jpa-native-sql-query/
StackOverflow’s Inserting into Spring data
How to insert into db in spring-data?