crud spring code example
Example: how to perform crud operations in spring boot
package com.example.demo.com.example.demo.resource;
import java.util.List;
import java.util.Optional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import com.example.demo.com.example.demo.model.Student;
import com.example.demo.com.example.demo.repository.StudentRep;
@RestController
@RequestMapping(value = "/webapi")
public class StudentResource {
@Autowired
private StudentRep studentRep;
@RequestMapping(method = RequestMethod.GET, value = "/getstudents")
public List<Student> getStudents() {
return studentRep.findAll();
}
@RequestMapping(method = RequestMethod.POST, value = "/addstudent")
public String addStudent(@RequestBody Student student) {
studentRep.save(student);
return "Added Student : "+student.getName();
}
@RequestMapping(method = RequestMethod.GET,value = "/getstudents/{id}")
public Optional<Student> getStudent(@PathVariable String id) {
return studentRep.findById(id);
}
@RequestMapping(method = RequestMethod.POST, value = "/deletestudent/{id}")
public String deleteStudent(@PathVariable String id) {
studentRep.deleteById(id);
return "Record Deleted :"+ id;
}
@RequestMapping(method = RequestMethod.PUT, value = "/updatestudent")
public String updateStudent(@RequestBody Student student) {
studentRep.findById(student.getId());
if(studentRep.existsById(student.getId())) {
studentRep.save(student);
return "Record updated";
}
else {
return "No record";
}
}
}