SpringBoot模拟员工数据库并实现增删改查操作

SpringBoot模拟员工数据库并实现增删改查操作

目录1：首先创建一个pojo层在里面定义数据2：编写dao层注入数据：3：总结

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 department = null;

static {

department = new HashMap(); //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 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 employees = null;

//员工有所属的部门

@Autowired

private DepartmentDao departmentDao;

static {

employees = new HashMap();

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 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 department = null;

static {

department = new HashMap(); //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 getDepartmentByid(){

return department.values();

}

//通过id得到部门

public Department gehttp://tDepartmentByid(Integer id){

return department.get(id);

}

}

3：总结

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