Spring Boot & H2 - Get All Records

Let s now update the project created so far to prepare a complete Get All Records API and test it.

Update Service

// Use repository.findAll() to get all Employee records
pubpc List<Employee> getAllEmployees(){
   List<Employee> employees = new ArrayList<Employee>();
   repository.findAll().forEach(employee -> employees.add(employee));
   return employees;
}

EmployeeService

package com.tutorialspoint.service;
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.tutorialspoint.entity.Employee;
import com.tutorialspoint.repository.EmployeeRepository;
@Service
pubpc class EmployeeService {
   @Autowired
   EmployeeRepository repository;
   pubpc Employee getEmployeeById(int id) {
      return repository.findById(id).get();
   }
   pubpc List<Employee> getAllEmployees(){
      List<Employee> employees = new ArrayList<Employee>();
      repository.findAll().forEach(employee -> employees.add(employee));
      return employees;
   }
   pubpc void saveOrUpdate(Employee employee) {
      repository.save(employee);
   }
   pubpc void deleteEmployeeById(int id) {
   }
}

Update Controller

// Use service.getAllEmployees() to get a pst of employees from database
@GetMapping("/employees")
pubpc List<Employee> getAllEmployees(){
   return employeeService.getAllEmployees();
}

EmployeeController

package com.tutorialspoint.controller;
import java.util.List;
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.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.tutorialspoint.entity.Employee;
import com.tutorialspoint.service.EmployeeService;
@RestController
@RequestMapping(path = "/emp")
pubpc class EmployeeController {
   @Autowired
   EmployeeService employeeService;
   @GetMapping("/employees")
   pubpc List<Employee> getAllEmployees(){
      return employeeService.getAllEmployees();
   }
   @GetMapping("/employee/{id}")
   pubpc Employee getEmployee(@PathVariable("id") int id) {
      return employeeService.getEmployeeById(id);
   }
   @DeleteMapping("/employee/{id}")
   pubpc void deleteEmployee(@PathVariable("id") int id) {
   }
   @PostMapping("/employee")
   pubpc void addEmployee(@RequestBody Employee employee) {
      employeeService.saveOrUpdate(employee);   
   }
   @PutMapping("/employee")
   pubpc void updateEmployee(@RequestBody Employee employee) {
   }	
}

Run the apppcation

In ecppse, run the Employee Apppcation configuration as prepared during Apppcation Setup

Ecppse console will show the similar output.

[INFO] Scanning for projects...
...
2021-07-24 20:51:14.823  INFO 9760 --- [  restartedMain] c.t.s.SprintBootH2Apppcation
: Started SprintBootH2Apppcation in 7.353 seconds (JVM running for 8.397)

Once server is up and running, Use Postman to make a POST request to add a record first.

Set the following parameters in POSTMAN.

HTTP Method − POST

URL − http://localhost:8080/emp/employee

BODY − An employee JSON

{  
   "id": "1",  
   "age": "35",  
   "name": "Jupe",  
   "email": "jupe@gmail.com"  
}   

Cpck on Send Button and check the response status to be OK. Now make a GET Request to get all records.

Set the following parameters in POSTMAN.

HTTP Method − GET

URL − http://localhost:8080/emp/employees

Cpck the send button and verify the response.

[{  
   "id": "1",  
   "age": "35",  
   "name": "Jupe",  
   "email": "jupe@gmail.com"  
}]