1：首先创建一个pojo层在里面定义数据
Department部门：
package com.example.springbootweb.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* @author ${范涛之}
* @Description
* @create 2021-09-19 10:25
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Department {
private Integer id;
private String department;
}
Employee部门：
package com.example.springbootweb.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* @author ${范涛之}
* @Description
* @create 2021-09-19 10:26
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Employee {
private Integer id;
private String lastname;
private String email;
private Integer gender; //0代表女 1代表男
private Department department;
private Data birth;
}
2：编写dao层注入数据：
部门层：
package com.example.springbootweb.dao;
import com.example.springbootweb.pojo.Department;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
/**
* @author ${范涛之}
* @Description
* @create 2021-09-19 10:28
*/
//部门dao
public class DepartmentDao {
//模拟数据库中的数据
private static Map<Integer, Department> department = null;
static {
department = new HashMap<Integer,Department>(); //创建一个部门表
department.put(101,new Department(101,"教学部"));
department.put(102,new Department(101,"教研部"));
department.put(103,new Department(101,"市场部"));
department.put(104,new Department(101,"运营部"));
department.put(105,new Department(101,"清洁部"));
}
//获得所有部门信息
public Collection<Department> getDepartment(){
return department.values();
}
//通过id得到部门
public Department getDepartment(Integer id){
return department.get(id);
}
}
员工层：
package com.example.springbootweb.dao;
import com.example.springbootweb.pojo.Department;
import com.example.springbootweb.pojo.Employee;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
/**
* @author ${范涛之}
* @Description
* @create 2021-09-19 10:44
*/
@Repository
public class EmployeeDao {
//模拟数据库中的数据
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","2831826106@qq.com",1,new Department(101,"教学部")));
employees.put(1002,new Employee(1002,"BB","2831826106@qq.com",1,new Department(101,"教研部")));
employees.put(1003,new Employee(1003,"CC","2831826106@qq.com",1,new Department(101,"市场部")));
employees.put(1004,new Employee(1004,"DD","2831826106@qq.com",1,new Department(101,"运营部")));
employees.put(1005,new Employee(1005,"EE","2831826106@qq.com",1,new Department(101,"清洁部")));
}
//主键自增
private static Integer ininID = 1006;
// 增加一个员工
public void save(Employee employee){
if (employee.getId()== null){
employee.setId(ininID++);
}
employee.setDepartment(departmentDao.getDepartmentByid(employee.getDepartment().getId()));
employees.put(employee.getId(),employee);
}
//查询全部员工
public Collection<Employee> getAll(){
return employees.values();
}
//通过ID查询员工
public Employee getEmployeeByid(Integer id){
return employees.get(id);
}
//删除员工拖过ID
public void delete(Integer id){
employees.remove(id);
}
}
部门层
package com.example.springbootweb.dao;
import com.example.springbootweb.pojo.Department;
import org.springframework.stereotype.Repository;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
/**
* @author ${范涛之}
* @Description
* @create 2021-09-19 10:28
*/
//部门dao
@Repository
public class DepartmentDao {
//模拟数据库中的数据
private static Map<Integer, Department> department = null;
static {
department = new HashMap<Integer,Department>(); //创建一个部门表
department.put(101,new Department(101,"教学部"));
department.put(102,new Department(101,"教研部"));
department.put(103,new Department(101,"市场部"));
department.put(104,new Department(101,"运营部"));
department.put(105,new Department(101,"清洁部"));
}
//获得所有部门信息
public Collection<Department> getDepartmentByid(){
return department.values();
}
//通过id得到部门
public Department getDepartmentByid(Integer id){
return department.get(id);
}
}
3：总结
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原文链接：https://blog.csdn.net/justleavel/article/details/120378070
