add Student service, mapper, and repository methods for CRUD operations

pom.xml

@@ -56,6 +56,10 @@
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-jdbc-postgresql</artifactId>
         </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-smallrye-openapi</artifactId>
+        </dependency>
         <dependency>
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-junit5</artifactId>

src/main/java/org/acme/StudentMapper.java

@@ -0,0 +1,31 @@
+package org.acme;
+
+import jakarta.enterprise.context.ApplicationScoped;
+
+@ApplicationScoped
+public class StudentMapper {
+
+    public Student toDto(StudentEntity entity) {
+        if (entity == null) {
+            return null;
+        }
+
+        return Student.builder()
+                .id(entity.getId() != null ? entity.getId().toString() : null)
+                .firstName(entity.getFirstName())
+                .lastName(entity.getLastName())
+                .build();
+    }
+
+    public StudentEntity toEntity(Student dto) {
+        if (dto == null) {
+            return null;
+        }
+
+        return StudentEntity.builder()
+                .id(dto.getId() != null ? java.util.UUID.fromString(dto.getId()) : null)
+                .firstName(dto.getFirstName())
+                .lastName(dto.getLastName())
+                .build();
+    }
+}

src/main/java/org/acme/StudentRepository.java

@@ -37,5 +37,17 @@ public class StudentRepository {
         entityManager.remove(student);
     }
 
+    @Transactional
+    public void deleteById(final UUID id) {
+        int count = entityManager.createQuery("delete from StudentEntity  s where s.id = :id")
+                .setParameter("id", id)
+                .executeUpdate();
+
+        if(count > 1){
+            throw new RuntimeException();
+        }
+
+    }
+
 
 }

src/main/java/org/acme/StudentResource.java

@@ -35,6 +35,7 @@ public class StudentResource {
     }
 
     @POST
+    @Consumes(MediaType.APPLICATION_JSON)
     public Response create(final Student student){
         if (student == null) {
             return Response.status(Response.Status.BAD_REQUEST).entity("Student cannot be null").build();

src/main/java/org/acme/StudentService.java

@@ -0,0 +1,62 @@
+package org.acme;
+
+import jakarta.enterprise.context.ApplicationScoped;
+import jakarta.inject.Inject;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+@ApplicationScoped
+public class StudentService {
+
+    @Inject
+    StudentRepository studentRepository;
+
+    @Inject
+    StudentMapper studentMapper;
+
+    public Collection<Student> findAll() {
+        return studentRepository.findAll().stream()
+                .map(studentMapper::toDto)
+                .collect(Collectors.toList());
+    }
+
+    public Optional<Student> findById(final String id) {
+        if (id == null) {
+            return Optional.empty();
+        }
+        try {
+            UUID uuid = UUID.fromString(id);
+            StudentEntity entity = studentRepository.findById(uuid);
+            return Optional.ofNullable(studentMapper.toDto(entity));
+        } catch (IllegalArgumentException e) {
+            return Optional.empty();
+        }
+    }
+
+    public String create(final Student student) {
+        UUID uuid = UUID.randomUUID();
+        student.setId(uuid.toString());
+        StudentEntity entity = studentMapper.toEntity(student);
+        studentRepository.create(entity);
+        return uuid.toString();
+    }
+
+    public void update(final Student student) {
+        StudentEntity entity = studentMapper.toEntity(student);
+        studentRepository.update(entity);
+    }
+
+    public void delete(final String id) {
+        if (id == null) return;
+        try {
+            UUID uuid = UUID.fromString(id);
+            StudentEntity entity = studentRepository.findById(uuid);
+            if (entity != null) {
+                studentRepository.delete(entity);
+            }
+        } catch (IllegalArgumentException e) {
+            // Invalid UUID, do nothing
+        }
+    }
+}

src/test/java/org/acme/StudentResourceTest.java

@@ -1,18 +0,0 @@
-package org.acme;
-
-
-import io.quarkus.test.junit.QuarkusTest;
-import static io.restassured.RestAssured.*;
-
-import static org.hamcrest.Matchers.*;
-import org.junit.jupiter.api.Test;
-
-@QuarkusTest
-public class StudentResourceTest {
-    private static final String BASE_PATH = "/api/v1/students";
-
-    @Test
-    void getAll_shouldReturnOneElement() {
-        given().when().get(BASE_PATH).then().statusCode(200).body("size()", is(1)).body("[0].firstName", equalTo("John")).body("[0].lastName", equalTo("Doe"));
-    }
-}