implement employee management with TypeORM integration

src/employees/employees.module.ts

 import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm'; // ✅ เพิ่ม
 import { EmployeesService } from './employees.service';
 import { EmployeesController } from './employees.controller';
+import { Employee } from './entities/employee.entity'; // ✅ เพิ่ม
 
 @Module({
+  imports: [TypeOrmModule.forFeature([Employee])], // ✅ เพิ่ม
   controllers: [EmployeesController],
   providers: [EmployeesService],
 })

src/employees/employees.service.ts

 import { Injectable } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
 import { CreateEmployeeDto } from './dto/create-employee.dto';
 import { UpdateEmployeeDto } from './dto/update-employee.dto';
+import { Employee } from './entities/employee.entity';
 
 @Injectable()
 export class EmployeesService {
+  constructor(
+    @InjectRepository(Employee)
+    private readonly employeeRepository: Repository<Employee>,
+  ) {}
+
+  // ✅ ใช้งานจริง
   create(createEmployeeDto: CreateEmployeeDto) {
-    return 'This action adds a new employee';
+    const newEmployee = this.employeeRepository.create(createEmployeeDto);
+    return this.employeeRepository.save(newEmployee);
   }
 
+  // ✅ ดึงพนักงานทั้งหมดจาก DB
   findAll() {
-    return `This action returns all employees`;
+    return this.employeeRepository.find();
   }
 
+  // ✅ ดึงพนักงานตาม ID
   findOne(id: number) {
-    return `This action returns a #${id} employee`;
+    return this.employeeRepository.findOneBy({ EmployeeID: id });
   }
 
-  update(id: number, updateEmployeeDto: UpdateEmployeeDto) {
-    return `This action updates a #${id} employee`;
+  // ✅ อัปเดตพนักงาน
+  async update(id: number, updateEmployeeDto: UpdateEmployeeDto) {
+    await this.employeeRepository.update(id, updateEmployeeDto);
+    return this.findOne(id);
   }
 
+  // ✅ ลบพนักงาน
   remove(id: number) {
-    return `This action removes a #${id} employee`;
+    return this.employeeRepository.delete(id);
   }
 }