46- Implement Delete Student Feature
1- Create a delete button next to update button in students.html
students.html
student-management-system --> src/main/resources --> templates --> students.html
<!DOCTYPE html>
<html xmlns:th="//www.thymeleaf.org">
<head>
<meta charset="ISO-8859-1">
<title>Student Management System</title>
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css"
integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u"
crossorigin="anonymous">
</head>
<body>
<h1 class=".text-success">Student Management System</h1>
<a th:href="@{/students/new}" class="btn btn-primary">Add Student</a>
<br><br><br>
<table class="table">
<thead>
<tr>
<th scope="col">Employee First Name </th>
<th scope="col"> Employee Last Name</th>
<th scope="col">Employee Email</th>
<th scope="col">Actions</th>
</tr>
</thead>
<tbody>
<tr th:each="student:${students}">
<td th:text="${student.firstName}" ></td>
<td th:text="${student.lastName}"></td>
<td th:text="${student.email}"></td>
<td><a th:href = "@{/students/edit/{id}(id=${student.id})}"
class = "btn btn-success">Update</a>
<a th:href = "@{/students/delete/{id}(id=${student.id})}"
class = "btn btn-danger">Delete</a></td>
</tr>
</tbody>
</table>
</body>
</html>
Service Class Updates
student-management-system --> src/main/java --> net.javaguides.springboot.service --> StudentService.java
package net.javaguides.springboot.service;
import java.util.List;
import net.javaguides.springboot.entity.Student;
public interface StudentService {
List<Student> getAllStudents();
Student saveStudent(Student student);
Student getStudentById(Long id);
Student updateStudent(Student student);
void deleteStudentById(long id);
}
ServiceImpl Class Updates
student-management-system --> src/main/java --> net.javaguides.springboot.service.impl --> StudentServiceImpl.java
package net.javaguides.springboot.sevice.impl;
import java.util.List;
import org.springframework.stereotype.Service;
import net.javaguides.springboot.entity.Student;
import net.javaguides.springboot.repository.StudentRepository;
import net.javaguides.springboot.service.StudentService;
@Service
public class StudentServiceImpl implements StudentService {
private StudentRepository studentRepository;
public StudentServiceImpl(StudentRepository studentRepository) {
super();
this.studentRepository = studentRepository;
}
@Override
public List<Student> getAllStudents() {
return studentRepository.findAll();
}
@Override
public Student saveStudent(Student student) {
return studentRepository.save(student);
}
@Override
public Student getStudentById(Long id) {
return studentRepository.findById(id).get();
}
@Override
public Student updateStudent(Student student) {
return studentRepository.save(student);
}
@Override
public void deleteStudentById(long id) {
studentRepository.deleteById(id);
}
}
Controller Class Updates
student-management-system --> src/main/java --> net.javaguides.springboot.controller --> StudentController.java
package net.javaguides.springboot.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import net.javaguides.springboot.entity.Student;
import net.javaguides.springboot.service.StudentService;
@Controller
public class StudentController {
private StudentService studentService;
public StudentController(StudentService studentService) {
super();
this.studentService = studentService;
}
@GetMapping("/students")
public String listStudents(Model model) {
model.addAttribute("students", studentService.getAllStudents());
return "students";
}
@GetMapping("/students/new")
public String createStudent(Model model) {
Student student= new Student();
model.addAttribute("student", student);
return "create_student";
}
@PostMapping("/students")
public String saveStudent(@ModelAttribute("student")Student student) {
studentService.saveStudent(student);
return "redirect:/students";
}
@GetMapping("/students/edit/{id}")
public String editStudentForm(@PathVariable long id,Model model) {
model.addAttribute("student",studentService.getStudentById(id));
return "edit_student";
}
@PostMapping("/students/{id}")
public String updateStudent(@PathVariable long id,@ModelAttribute ("student") Student student,Model model) {
Student existingStudent=studentService.getStudentById(id);
//Changing values of previous employee
existingStudent.setId(id);
existingStudent.setFirstName(student.getFirstName());
existingStudent.setLastName(student.getLastName());
existingStudent.setEmail(student.getEmail());
//Saving changes made
studentService.updateStudent(existingStudent);
return "redirect:/students";
}
@GetMapping("/students/delete/{id}")
public String deleteStudent(@PathVariable long id) {
studentService.deleteStudentById(id);
return "redirect:/students";
}
}
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