SpringBoot模拟员工数据库并实现增删改查操作

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","[e-mail]",1,new department(101,"教学部")));
        employees.put(1002,new employee(1002,"bb","[e-mail]",1,new department(101,"教研部")));
        employees.put(1003,new employee(1003,"cc","[e-mail]",1,new department(101,"市场部")));
        employees.put(1004,new employee(1004,"dd","[e-mail]",1,new department(101,"运营部")));
        employees.put(1005,new employee(1005,"ee","[e-mail]",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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