CRUD methods (save, findById, findAll, delete) in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to save an entity using Spring Data JPA.

Spring Boot

repository.[1](entity);

Drag options to blanks, or click blank then click option'

AfindById

Bsave

Cdelete

DfindAll

Attempts:

3 left

💡 Hint

Common Mistakes

Using findById instead of save

Using delete instead of save

The save method stores or updates an entity in the database.

2fill in blank

medium

Complete the code to find an entity by its ID.

Spring Boot

Optional<Entity> result = repository.[1](id);

Drag options to blanks, or click blank then click option'

AfindById

Bsave

Cdelete

DfindAll

Attempts:

3 left

💡 Hint

Common Mistakes

Using save instead of findById

Using findAll instead of findById

The findById method returns an Optional containing the entity if found.

3fill in blank

hard

Fix the error in the code to retrieve all entities.

Spring Boot

List<Entity> list = repository.[1]();

Drag options to blanks, or click blank then click option'

Asave

BfindById

CfindAll

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using findById which returns Optional

Using save which saves data

The findAll method returns a list of all entities in the repository.

4fill in blank

hard

Fill both blanks to delete an entity by its ID.

Spring Boot

repository.[1]([2]);

Drag options to blanks, or click blank then click option'

AdeleteById

Bsave

Cid

DfindAll

Attempts:

3 left

💡 Hint

Common Mistakes

Using save instead of deleteById

Passing the wrong argument instead of the ID

The deleteById method removes the entity with the given ID from the database.

5fill in blank

hard

Fill all three blanks to save an entity, then find it by ID and delete it.

Spring Boot

repository.[1](entity);
Optional<Entity> found = repository.[2](entity.[3]());

Drag options to blanks, or click blank then click option'

Asave

BfindById

CgetId

Ddelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using delete instead of findById

Using a wrong method to get the ID

First, save stores the entity. Then, findById retrieves it by its ID using getId().