Update for HTTP PATCH method

Author: darbyluv2code

04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee-and-delete-employee/HELP.md 04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee/HELP.md

@@ -0,0 +1,25 @@
+package com.luv2code.springboot.cruddemo.dao;
+
+import com.luv2code.springboot.cruddemo.entity.Employee;
+
+import java.util.List;
+
+public interface EmployeeDAO {
+
+    List<Employee> findAll();
+
+    Employee findById(int theId);
+
+    Employee save(Employee theEmployee);
+
+}
+
+
+
+
+
+
+
+
+
+

04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee-and-delete-employee/mvnw 04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee/mvnw

@@ -0,0 +1,69 @@
+package com.luv2code.springboot.cruddemo.dao;
+
+import com.luv2code.springboot.cruddemo.entity.Employee;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.TypedQuery;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public class EmployeeDAOJpaImpl implements EmployeeDAO {
+
+    // define field for entitymanager
+    private EntityManager entityManager;
+
+
+    // set up constructor injection
+    @Autowired
+    public EmployeeDAOJpaImpl(EntityManager theEntityManager) {
+        entityManager = theEntityManager;
+    }
+
+
+    @Override
+    public List<Employee> findAll() {
+
+        // create a query
+        TypedQuery<Employee> theQuery = entityManager.createQuery("from Employee", Employee.class);
+
+        // execute query and get result list
+        List<Employee> employees = theQuery.getResultList();
+
+        // return the results
+        return employees;
+    }
+
+    @Override
+    public Employee findById(int theId) {
+
+        // get employee
+        Employee theEmployee = entityManager.find(Employee.class, theId);
+
+        // return employee
+        return theEmployee;
+    }
+
+    @Override
+    public Employee save(Employee theEmployee) {
+
+        // save employee
+        Employee dbEmployee = entityManager.merge(theEmployee);
+
+        // return the dbEmployee
+        return dbEmployee;
+    }
+
+}
+
+
+
+
+
+
+
+
+
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+

04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee-and-delete-employee/mvnw.cmd 04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee/mvnw.cmd

@@ -63,24 +63,6 @@ public Employee updateEmployee(@RequestBody Employee theEmployee) {
         return dbEmployee;
     }
 
-    // add mapping for DELETE /employees/{employeeId} - delete employee
-
-    @DeleteMapping("/employees/{employeeId}")
-    public String deleteEmployee(@PathVariable int employeeId) {
-
-        Employee tempEmployee = employeeService.findById(employeeId);
-
-        // throw exception if null
-
-        if (tempEmployee == null) {
-            throw new RuntimeException("Employee id not found - " + employeeId);
-        }
-
-        employeeService.deleteById(employeeId);
-
-        return "Deleted employee id - " + employeeId;
-    }
-
 }
 
 

04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee-and-delete-employee/pom.xml 04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee/pom.xml

@@ -0,0 +1,15 @@
+package com.luv2code.springboot.cruddemo.service;
+
+import com.luv2code.springboot.cruddemo.entity.Employee;
+
+import java.util.List;
+
+public interface EmployeeService {
+
+    List<Employee> findAll();
+
+    Employee findById(int theId);
+
+    Employee save(Employee theEmployee);
+
+}

04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee-and-delete-employee/src/main/java/com/luv2code/springboot/cruddemo/CruddemoApplication.java 04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee/src/main/java/com/luv2code/springboot/cruddemo/CruddemoApplication.java

@@ -0,0 +1,43 @@
+package com.luv2code.springboot.cruddemo.service;
+
+import com.luv2code.springboot.cruddemo.dao.EmployeeDAO;
+import com.luv2code.springboot.cruddemo.entity.Employee;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+@Service
+public class EmployeeServiceImpl implements EmployeeService {
+
+    private EmployeeDAO employeeDAO;
+
+    @Autowired
+    public EmployeeServiceImpl(EmployeeDAO theEmployeeDAO) {
+        employeeDAO = theEmployeeDAO;
+    }
+
+    @Override
+    public List<Employee> findAll() {
+        return employeeDAO.findAll();
+    }
+
+    @Override
+    public Employee findById(int theId) {
+        return employeeDAO.findById(theId);
+    }
+
+    @Transactional
+    @Override
+    public Employee save(Employee theEmployee) {
+        return employeeDAO.save(theEmployee);
+    }
+
+}
+
+
+
+
+
+

04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee/src/main/java/com/luv2code/springboot/cruddemo/dao/EmployeeDAO.java

@@ -0,0 +1,25 @@
+package com.luv2code.springboot.cruddemo.dao;
+
+import com.luv2code.springboot.cruddemo.entity.Employee;
+
+import java.util.List;
+
+public interface EmployeeDAO {
+
+    List<Employee> findAll();
+
+    Employee findById(int theId);
+
+    Employee save(Employee theEmployee);
+
+}
+
+
+
+
+
+
+
+
+
+

04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee/src/main/java/com/luv2code/springboot/cruddemo/dao/EmployeeDAOJpaImpl.java

@@ -0,0 +1,69 @@
+package com.luv2code.springboot.cruddemo.dao;
+
+import com.luv2code.springboot.cruddemo.entity.Employee;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.TypedQuery;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+
+@Repository
+public class EmployeeDAOJpaImpl implements EmployeeDAO {
+
+    // define field for entitymanager
+    private EntityManager entityManager;
+
+
+    // set up constructor injection
+    @Autowired
+    public EmployeeDAOJpaImpl(EntityManager theEntityManager) {
+        entityManager = theEntityManager;
+    }
+
+
+    @Override
+    public List<Employee> findAll() {
+
+        // create a query
+        TypedQuery<Employee> theQuery = entityManager.createQuery("from Employee", Employee.class);
+
+        // execute query and get result list
+        List<Employee> employees = theQuery.getResultList();
+
+        // return the results
+        return employees;
+    }
+
+    @Override
+    public Employee findById(int theId) {
+
+        // get employee
+        Employee theEmployee = entityManager.find(Employee.class, theId);
+
+        // return employee
+        return theEmployee;
+    }
+
+    @Override
+    public Employee save(Employee theEmployee) {
+
+        // save employee
+        Employee dbEmployee = entityManager.merge(theEmployee);
+
+        // return the dbEmployee
+        return dbEmployee;
+    }
+
+}
+
+
+
+
+
+
+
+
+
+
+

04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee-and-delete-employee/src/main/java/com/luv2code/springboot/cruddemo/entity/Employee.java 04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee/src/main/java/com/luv2code/springboot/cruddemo/entity/Employee.java

@@ -1,21 +1,27 @@
 package com.luv2code.springboot.cruddemo.rest;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.luv2code.springboot.cruddemo.entity.Employee;
 import com.luv2code.springboot.cruddemo.service.EmployeeService;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
 
 import java.util.List;
+import java.util.Map;
 
 @RestController
 @RequestMapping("/api")
 public class EmployeeRestController {
 
     private EmployeeService employeeService;
 
+    private ObjectMapper objectMapper;
+
     @Autowired
-    public EmployeeRestController(EmployeeService theEmployeeService) {
+    public EmployeeRestController(EmployeeService theEmployeeService, ObjectMapper theObjectMapper) {
         employeeService = theEmployeeService;
+        objectMapper = theObjectMapper;
     }
 
     // expose "/employees" and return a list of employees
@@ -63,22 +69,43 @@ public Employee updateEmployee(@RequestBody Employee theEmployee) {
         return dbEmployee;
     }
 
-    // add mapping for DELETE /employees/{employeeId} - delete employee
+    // add mapping for PATCH /employees/{employeeId} - patch employee ... partial update
 
-    @DeleteMapping("/employees/{employeeId}")
-    public String deleteEmployee(@PathVariable int employeeId) {
+    @PatchMapping("/employees/{employeeId}")
+    public Employee patchEmployee(@PathVariable int employeeId,
+                                  @RequestBody Map<String, Object> patchPayload) {
 
         Employee tempEmployee = employeeService.findById(employeeId);
 
         // throw exception if null
-
         if (tempEmployee == null) {
             throw new RuntimeException("Employee id not found - " + employeeId);
         }
 
-        employeeService.deleteById(employeeId);
+        // throw exception if request body contains "id" key
+        if (patchPayload.containsKey("id")) {
+            throw new RuntimeException("Employee id not allowed in request body - " + employeeId);
+        }
+
+        Employee patchedEmployee = apply(patchPayload, tempEmployee);
+
+        Employee dbEmployee = employeeService.save(patchedEmployee);
+
+        return dbEmployee;
+    }
+
+    private Employee apply(Map<String, Object> patchPayload, Employee tempEmployee) {
+
+        // Convert employee object to a JSON object node
+        ObjectNode employeeNode = objectMapper.convertValue(tempEmployee, ObjectNode.class);
+
+        // Convert the patchPayload map to a JSON object node
+        ObjectNode patchNode = objectMapper.convertValue(patchPayload, ObjectNode.class);
+
+        // Merge the patch updates into the employee node
+        employeeNode.setAll(patchNode);
 
-        return "Deleted employee id - " + employeeId;
+        return objectMapper.convertValue(employeeNode, Employee.class);
     }
 
 }

04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee-and-delete-employee/src/main/java/com/luv2code/springboot/cruddemo/rest/EmployeeRestController.java 04-spring-boot-rest-crud/13-spring-boot-rest-crud-employee-rest-controller-update-employee/src/main/java/com/luv2code/springboot/cruddemo/rest/EmployeeRestController.java

@@ -0,0 +1,15 @@
+package com.luv2code.springboot.cruddemo.service;
+
+import com.luv2code.springboot.cruddemo.entity.Employee;
+
+import java.util.List;
+
+public interface EmployeeService {
+
+    List<Employee> findAll();
+
+    Employee findById(int theId);
+
+    Employee save(Employee theEmployee);
+
+}