模拟数据源

建立pojo

Employee

package com.qw.springboot_test.pojo;

import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;
import org.omg.CORBA.INTERNAL;

import java.util.Date;

/**
 * @author QBS @win10
 * @version 1.0
 * @date 2021/5/24 0:30
 * 类说明
 */
@Data
@NoArgsConstructor
@ToString
public class Employee {
    private Integer id;
    private String lastName;
    private String email;
    private Integer gender; //0：女 1：男

    private Department department;
    private Date date;

    public Employee(Integer id, String lastName, String email, Integer gender, Department department) {
        this.id = id;
        this.lastName = lastName;
        this.email = email;
        this.gender = gender;
        this.department = department;
        this.date = new Date();
    }
}

Department

package com.qw.springboot_test.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;

/**
 * @author QBS @win10
 * @version 1.0
 * @date 2021/5/24 0:29
 * 部门
 */

@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
public class Department {
    private Integer id;
    private String departmentName;
}

    

模拟Dao

EmployeeDao

@Repository
public class EmployeeDao {

    private static Map<Integer,Employee> employees = null;
    //员工有所属的部门

    @Autowired
    private DepartmentDao departmentDao;

    static {
        employees = new HashMap<Integer, Employee>();
        employees.put(1001,new Employee(1001,"AA","A12313@qq.com",1,new Department(101,"后勤部")));
        employees.put(1002,new Employee(1002,"BB","B12313@qq.com",0,new Department(102,"后勤部")));
        employees.put(1003,new Employee(1003,"CC","C12313@qq.com",1,new Department(103,"后勤部")));
        employees.put(1004,new Employee(1004,"DD","D12313@qq.com",0,new Department(104,"后勤部")));
        employees.put(1005,new Employee(1005,"EE","E12313@qq.com",1,new Department(105,"后勤部")));
    }


    /**
     * 增加一个员工
     * 主键自增
     */
    private static Integer initId = 1006;
    public void save(Employee employee){
        if (employee.getId() == null){
            employee.setId(initId);
        }
        employee.setDepartment(departmentDao.getDepartmentById(employee.getDepartment().getId()));
        employees.put(employee.getId(),employee);
    }

    /**
     * 查询全部员工
     *
     */
    public Collection<Employee> getEmployee(){
        return employees.values();
    }

    /**
     * 通过id查询员工
     *
     */
    public Employee getEmployeeById(Integer id){
        return employees.get(id);
    }

    /**
     * 删除员工
     */
    public void deleteEmployee(Integer id){
        employees.remove(id);
    }
}

DepartmentDao

@Repository
public class DepartmentDao {

    //模拟数据库中的数据
    private static Map<Integer, Department> departments = null;
    static{
        departments = new HashMap<Integer, Department>();             //创建一个部门表


        departments.put(101,new Department(101,"教学部"));
        departments.put(102,new Department(102,"市场部"));
        departments.put(103,new Department(103,"教研部"));
        departments.put(104,new Department(104,"运营部"));
        departments.put(105,new Department(105,"后勤部"));
    }

    /**
     * 所有部门信息
     */

    public Collection<Department> getDepartments(){
        return departments.values();
    }

    public Department getDepartmentById(Integer id){
        return departments.get(id);
    }
}