Notice the usage of annotations and to map various URIs to controller methods. Clients will connect with these endpoints to get/update/delete employees records. Public void deleteEmployeeById(Long id) throws RecordNotFoundExceptionįinally expose all operations through MVC URLs or REST endpoints. Optional employee = repository.findById(entity.getId()) ĮmployeeEntity newEntity = employee.get() Public EmployeeEntity createOrUpdateEmployee(EmployeeEntity entity) throws RecordNotFoundException Throw new RecordNotFoundException("No employee record exist for given id") Optional employee = repository.findById(id) Public EmployeeEntity getEmployeeById(Long id) throws RecordNotFoundException List employeeList = repository.findAll() Generally, we will connect with repository here for crud operations. The service layer is optional – still recommended to perform additional business logic if any. We are using H2 database so respective properties are used.Īlso, we have used couple of more properties to enable H2 console and extensive logging. To connect to database, we must configure the datasource. ", lastName=" + lastName + ", email=" + email + "]" Return "EmployeeEntity [id=" + id + ", firstName=" + firstName + Import class EmployeeEntity Long String String nullable=false, length=200) Remember to include only JPA API annotations ( javax.persistence.*) to de-couple hibernate from application code.
SPRING BOOT CRUD EXAMPLE WITH MYSQL AND JSP CODE
The types of entity class and it’s ID field are specified in the generic parameters on JpaRepository. Important The code has been updated to support Spring Boot 2.2.2, java 11, implement UserDetailService strategy and resolve minor/major issues (January 16, 2020). Whenever possible, extend JpaRepository interface to allows to create repository implementations automatically, at runtime, for any given entity class. The first step to work with data in database is to model it’s structure in JPA entity classes and create repository interfaces for them.
In this example, we are using maven to add runtime jars in project. The purpose of this demo is to showcase the nuts and bolts, which make this interaction possible, not covering the complexity in business logic involved in real world applications. The demo operations enable the clients to modify the employee records in database. In this example, we are creating crud operations and exposing them through REST APIs so that UI clients can invoke these operations. Learn to create apis/methods for crud operations in spring boot application which modify the data in database using hibernate/jpa persistence apis.