后端部门管理页面代码
后端部门管理代码找代写，就一点点，不多，拉一下苦命的大学生吧！可➕V联系
java 编程语言的可以使用若依框架，比较简单
https://gitee.com/y_project/RuoYi-Vue
- 你可以看下这个问题的回答https://ask.csdn.net/questions/7624970
- 你也可以参考下这篇文章：编写三个系别的学生类：英语系，计算机系，文学系（要求通过继承学生抽象类）各系来显示以下成绩：
- 除此之外, 这篇博客: 操作系统实验报告（二）银行家算法中的 八、 实验数据及源代码（学生必须提交自己设计的程序源代码，并有注释，源代码电子版也一并提交），包括思考题的程序。 部分也许能够解决你的问题, 你可以仔细阅读以下内容或跳转源博客中阅读:
实验源代码：
#include <bits/stdc++.h> using namespace std; typedef long long ll; const int resourceNum = 5; //资源数量 const int processNum = 5; //进程数量 //系统可用的剩余资源 int available[resourceNum]; //进程的最大需求 int maxRequest[processNum][resourceNum]; //进程已经占有的资源 int allocation[processNum][resourceNum]; //进程还需要的资源（满足关系need + allocation == maxRequest） int need[processNum][resourceNum]; //复制available数组，复制的目的仅是为了在检查系统是否安全的时候不破坏原来的available数组 int work[resourceNum]; //进程是否已经完成(为true代表已经完成，全部为true就代表安全) int finish[processNum]; //安全序列号 int safeSeries[processNum]; //申请资源的数量 int request[resourceNum]; //已经完成的进程数量 int cnt = 0; //判断某一进程的need[]是不是全部为0（全部为0就代表该进程已完成） bool isAllZero(int pid){ for(int j = 0;j<resourceNum;++j){ if(need[pid][j]){ return 0; } } return 1; } //目前资源使用情况 void info(){ printf("当前系统剩余资源："); for(int i = 0;i < resourceNum;++i){ printf("%d ",available[i]); } printf("\n"); printf("当前所有进程的资源使用情况如下：\n"); printf("PID\t\tmaxRequest\t\tallocation\t\tneed\n"); for(int i = 0;i < processNum;++i){ printf("%05d\t\t",i); //输出PID //输出maxRequest for(int j = 0;j<resourceNum;++j){ printf("%-2d ",maxRequest[i][j]); } printf("\t\t"); //输出allocation for(int j = 0;j<resourceNum;++j){ printf("%-2d ",allocation[i][j]); } printf("\t\t"); //输出need for(int j = 0;j<resourceNum;++j){ printf("%-2d ",need[i][j]); } printf("\n"); } } //判断当前系统是否安全 bool isSafe(bool showinfo = 1/*showinfo:是否显示分配过程，默认显示*/){ //初始化finish memset(finish,0,sizeof(finish)); int finishNum = 0; //已经完成的进程数量 int safeIndex = 0; //安全序列的下标 //复制available数组给work for(int i = 0;i < resourceNum;++i){ work[i] = available[i]; } //检查是否有进程已经完成（所需资源全部为0就视为完成） for(int i = 0;i < processNum;++i){ if(isAllZero(i)){ finish[i] = 1; finishNum += 1; } } int lastFinishNum = -1;//上一趟循环之后完成的进程数量 int pid = 0; //当前是哪个进程 bool tag = 1; //标识系统是否安全 while(finishNum < processNum){ int num; pid %= processNum; if(pid == 0){ //pid==0，说明这是新的一趟循环 //如果一趟循环之后，完成的进程数量都还没有增加，那么剩下的资源都不可能有完成的了，所以不安全 if(finishNum == lastFinishNum){ tag = 0; break; } lastFinishNum = finishNum; } if(finish[pid]){ ++pid; continue; //当前进程已完成，跳过 } num = 0; for(int j = 0;j < resourceNum;++j){ num += need[pid][j] <= work[j]; } //当前系统资源能满足进程j所需的所有资源，说明该进程能完成 if(num == resourceNum){ for(int j = 0;j<resourceNum;++j){ work[j] += allocation[pid][j]; //释放该进程占有的资源 } finish[pid] = 1; //标记一下该进程已完成 safeSeries[safeIndex++] = pid; //安全序列 if(showinfo){ printf("----------------------------------------------------\n"); printf("%d) 把当前系统资源分配给进程%05d\n",safeIndex,pid); printf(">>> 进程%05d目前还需要的资源为", pid); for(int j = 0;j < resourceNum;++j){ printf("%-2d ", need[pid][j]); } printf("能满足要求！\n"); printf(">>> 进程%05d运行完成后，释放掉该进程占有的资源后，当前系统剩余资源为",pid); for(int j = 0;j < resourceNum;++j){ printf("%-2d ", work[j]); } printf("\n"); } finishNum++; } ++pid; } if(showinfo){ if(tag){ printf("\n当前系统安全，安全序列为："); for(int i = 0;i < safeIndex;++i){ printf("%d ",safeSeries[i]); } printf("\n"); }else{ printf("\n当前剩余资源无法使接下来的任一进程完成工作，所以当前系统不安全!\n"); } } return tag; } //初始化数据 void init(){ int i,j; //随机数种子 srand((unsigned long)time(0)); //写available数组 for(i = 0;i < resourceNum;++i){ available[i] = rand() % 5 + 3; } //写maxRequest数组 for(i = 0;i < processNum;++i){ for(j = 0;j < resourceNum;++j){ maxRequest[i][j] = rand() % 5 + 5; } } //写allocation数组 for(i = 0;i < processNum;++i){ for(j = 0;j < resourceNum;++j){ allocation[i][j] = rand() % (maxRequest[i][j]); } } //根据maxRequest和allocation写need数组 for(i = 0;i < processNum;++i){ for(j = 0;j < resourceNum;++j){ need[i][j] = maxRequest[i][j] - allocation[i][j]; } } } //随机分配资源 void allot(){ //随机数种子 srand((unsigned long)time(0)); int pid = 0; //随机一个进程，但是该进程不能是已经完成的进程 do{ pid = rand() % processNum; }while(isAllZero(pid)); //随机分配资源 for(int i = 0;i < resourceNum;++i){ request[i] = rand() % min(available[i] + 1, need[pid][i] + 1); //随机分配资源 } printf("正在尝试对进程%05d分配资源：",pid); for(int j = 0;j < resourceNum;++j){ printf("%-2d ", request[j]); } printf("\n"); //分配资源 for(int j = 0;j < resourceNum;++j){ need[pid][j] -= request[j]; allocation[pid][j] += request[j]; available[j] -= request[j]; } info(); //如果本次分配能直接满足该进程的要求，那么直接同意分配！ if(isAllZero(pid)){ printf("本次分配之后，已经能满足该进程的要求，同意分配！进程完成之后释放资源！\n"); for(int j = 0;j < resourceNum;++j){ available[j] += allocation[pid][j]; } ++cnt; }else{ printf("本次分配之后，仍未能满足该进程的要求\n"); //检查分配之后是否安全 if(isSafe()){ //同意分配 printf("同意本次分配！\n"); }else{ printf("回滚本次分配！\n"); for(int j = 0;j < resourceNum;++j){ need[pid][j] += request[j]; allocation[pid][j] -= request[j]; available[j] += request[j]; } } } info(); } //菜单 bool menu(){ printf("***************************\n"); printf("1. 查看系统当前资源使用情况\n"); printf("2. 分析当前系统安全性\n"); printf("3. 分配资源\n"); printf("4. 重新生成系统资源数据\n"); printf("0. 退出程序\n"); printf("***************************\n"); printf("请选择："); int a = -1; //当前选择 do{ scanf("%d",&a); if(a < 0 || a > 4){ printf("请输入正确的数字！"); a = -1; } while(getchar() != '\n'){};//清空缓冲区 }while(a == -1); if(a == 0){ return 0; //退出程序 }else if(a == 1){ info(); }else if(a == 2){ info(); isSafe(); }else if(a == 3){ allot(); }else if(a == 4){ //初始化数据（要保证初始化之后系统是安全的！） do{ init(); }while(!isSafe(0)); printf("初始化数据完成！\n"); info(); } cout << endl; system("pause"); return 1; }; int main() { //初始化数据（要保证初始化之后系统是安全的！） do{ init(); }while(!isSafe(0)); //检查系统中是否已经有进程完成： for(int i = 0;i < processNum;++i){ if(isAllZero(i)){ ++cnt; //释放资源 for(int j = 0;j < resourceNum;++j){ available[j] += allocation[i][j]; } } } while(menu()){ //显示菜单 if(cnt >= processNum){ printf("当前所有进程已经完成，程序结束！\n"); break; } system("cls"); //清屏操作 } return 0; }- 您还可以看一下 唐宇迪老师的深度学习模型部署与剪枝优化实例课程中的 课程简介（课程数据代码下载，需网页登录）小节, 巩固相关知识点
可以试试
package com.hjf.dao;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import com.hjf.entity.Course;
import com.hjf.util.DBUtil;
/**
* 课程Dao
* Dao层操作数据
* @author Hu
*
*/
public class CourseDao {
/**
* 添加
* @param course
* @return
*/
public boolean add(Course course) {
String sql = "insert into course(name, sex,minzu,zhuce,age,zhengzhi,fuwu) values('" + course.getName() + "','" + course.getSex() + "','" + course.getMinzu() + "','" + course.getZhuce()+ "','" + course.getAge() + "','" + course.getZhengzhi() + "','" + course.getFuwu() + "')";
//创建数据库链接
Connection conn = DBUtil.getConn();
Statement state = null;
boolean f = false;
int a = 0;
try {
state = conn.createStatement();
state.executeUpdate(sql);
} catch (Exception e) {
e.printStackTrace();
} finally {
//关闭连接
DBUtil.close(state, conn);
}
if (a > 0) {
f = true;
}
return f;
}
/**
* 删除
*
* @param id
* @return
*/
public boolean delete (int id) {
boolean f = false;
String sql = "delete from course where id='" + id + "'";
Connection conn = DBUtil.getConn();
Statement state = null;
int a = 0;
try {
state = conn.createStatement();
a = state.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(state, conn);
}
if (a > 0) {
f = true;
}
return f;
}
/**
* 修改
* @param name
* @param pass
*/
public boolean update(Course course) {
String sql = "update course set name='" + course.getName() + "', sex='" + course.getSex() + "', minzu='" + course.getMinzu()+ "', zhuce='" + course.getZhuce()+ "', age='" + course.getAge()+ "', zhengzhi='" + course.getZhengzhi()+ "', fuwu='" + course.getFuwu()
+ "' where id='" + course.getId() + "'";
Connection conn = DBUtil.getConn();
Statement state = null;
boolean f = false;
int a = 0;
try {
state = conn.createStatement();
a = state.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(state, conn);
}
if (a > 0) {
f = true;
}
return f;
}
/**
* 验证课程名称是否唯一
* true --- 不唯一
* @param name
* @return
*/
public boolean name(String name) {
boolean flag = false;
String sql = "select name from course where name = '" + name + "'";
Connection conn = DBUtil.getConn();
Statement state = null;
ResultSet rs = null;
try {
state = conn.createStatement();
rs = state.executeQuery(sql);
while (rs.next()) {
flag = true;
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(rs, state, conn);
}
return flag;
}
/**
* 通过ID得到课程信息
* @param id
* @return
*/
public Course getCourseById(int id) {
String sql = "select * from course where id ='" + id + "'";
Connection conn = DBUtil.getConn();
Statement state = null;
ResultSet rs = null;
Course course = null;
try {
state = conn.createStatement();
rs = state.executeQuery(sql);
while (rs.next()) {
String name = rs.getString("name");
String sex = rs.getString("sex");
String minzu = rs.getString("minzu");
String zhuce = rs.getString("zhuce");
String age = rs.getString("age");
String zhengzhi = rs.getString("zhengzhi");
String fuwu = rs.getString("fuwu");
course = new Course(id, name, sex, minzu,zhuce,age,zhengzhi,fuwu);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
DBUtil.close(rs, state, conn);
}
return course;
}
/**
* 通过name得到Course
* @param name
* @return
*/
public Course getCourseByName(String name) {
String sql = "select * from course where name ='" + name + "'";
Connection conn = DBUtil.getConn();
Statement state = null;
ResultSet rs = null;
Course course = null;
try {
state = conn.createStatement();
rs = state.executeQuery(sql);
while (rs.next()) {
int id = rs.getInt("id");
String sex = rs.getString("sex");
String minzu = rs.getString("minzu");
String zhuce = rs.getString("zhuce");
String age = rs.getString("age");
String zhengzhi = rs.getString("zhengzhi");
String fuwu = rs.getString("fuwu");
course = new Course(id, name, sex, minzu,zhuce,age,zhengzhi,fuwu);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
DBUtil.close(rs, state, conn);
}
return course;
}
/**
* 查找
* @param name
* @param teacher
* @param classroom
* @return
*/
public List<Course> search(String name, String sex, String minzu, String zhuce, String age, String zhengzhi, String fuwu) {
String sql = "select * from course where ";
if (name != ""&&sex !=""&&minzu!=""&&zhuce!=""&&age!=""&&zhengzhi!=""&&fuwu!="") {
sql += "name like '%" + name + "%'&&sex like '%" + sex + "%'&&minzu like '%" + minzu + "%'&&zhuce like '%" + zhuce + "%'&&age like '%" + age + "%'&&zhengzhi like '%" + zhengzhi + "%'&&fuwu like '%" + fuwu + "%'";
}
if (sex != "") {
sql += "sex like '%" + sex + "%'";
}
if (minzu != "") {
sql += "minzu like '%" + minzu + "%'";
}
if (zhuce != "") {
sql += "zhuce like '%" + zhuce + "%'";
}
if (age != "") {
sql += "age like '%" + age + "%'";
}
if (zhengzhi != "") {
sql += "zhengzhi like '%" + zhengzhi + "%'";
}
if (fuwu != "") {
sql += "fuwu like '%" + fuwu + "%'";
}
List<Course> list = new ArrayList<>();
Connection conn = DBUtil.getConn();
Statement state = null;
ResultSet rs = null;
try {
state = conn.createStatement();
rs = state.executeQuery(sql);
Course bean = null;
while (rs.next()) {
int id = rs.getInt("id");
String name2 = rs.getString("name");
String sex2 = rs.getString("sex");
String minzu2 = rs.getString("minzu");
String zhuce2 = rs.getString("zhuce");
String age2 = rs.getString("age");
String zhengzhi2 = rs.getString("zhengzhi");
String fuwu2 = rs.getString("fuwu");
bean = new Course(id, name2, sex2, minzu2,zhuce2,age2,zhengzhi2,fuwu2);
list.add(bean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(rs, state, conn);
}
return list;
}
/**
* 全部数据
* @param name
* @param teacher
* @param classroom
* @return
*/
public List<Course> list() {
String sql = "select * from course";
List<Course> list = new ArrayList<>();
Connection conn = DBUtil.getConn();
Statement state = null;
ResultSet rs = null;
try {
state = conn.createStatement();
rs = state.executeQuery(sql);
Course bean = null;
while (rs.next()) {
int id = rs.getInt("id");
String name2 = rs.getString("name");
String sex2 = rs.getString("sex");
String minzu2 = rs.getString("minzu");
String zhuce2 = rs.getString("zhuce");
String age2 = rs.getString("age");
String zhengzhi2 = rs.getString("zhengzhi");
String fuwu2 = rs.getString("fuwu");
bean = new Course(id, name2, sex2, minzu2,zhuce2,age2,zhengzhi2,fuwu2);
list.add(bean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(rs, state, conn);
}
return list;
}
}
package com.hjf.entity;
public class Course {
private int id;
private String name;
private String sex;
private String minzu;
private String zhuce;
private String age;
private String zhengzhi;
private String fuwu;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getMinzu() {
return minzu;
}
public void setMinzu(String minzu) {
this.minzu = minzu;
}
public String getZhuce() {
return zhuce;
}
public void setZhuce(String zhuce) {
this.zhuce = zhuce;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getZhengzhi() {
return zhengzhi;
}
public void setZhengzhi(String zhengzhi) {
this.zhengzhi = zhengzhi;
}
public String getFuwu() {
return fuwu;
}
public void setFuwu(String fuwu) {
this.fuwu = fuwu;
}
public Course() {}
public Course(int id, String name, String sex, String minzu,String zhuce, String age, String zhengzhi,String fuwu) {
this.id = id;
this.name = name;
this.sex = sex;
this.minzu = minzu;
this.zhuce = zhuce;
this.age = age;
this.zhengzhi = zhengzhi;
this.fuwu = fuwu;
}
public Course(String name, String sex, String minzu,String zhuce, String age, String zhengzhi,String fuwu) {
this.name = name;
this.sex = sex;
this.minzu = minzu;
this.zhuce = zhuce;
this.age = age;
this.zhengzhi = zhengzhi;
this.fuwu = fuwu;
}
}
package com.hjf.service;
import java.util.List;
import com.hjf.dao.CourseDao;
import com.hjf.entity.Course;
/**
* CourseService
* 服务层
* @author Hu
*
*/
public class CourseService {
CourseDao cDao = new CourseDao();
/**
* 添加
* @param course
* @return
*/
public boolean add(Course course) {
boolean f = false;
if(!cDao.name(course.getName())) {
cDao.add(course);
f = true;
}
return f;
}
/**
* 删除
*/
public void del(int id) {
cDao.delete(id);
}
/**
* 修改
* @return
*/
public void update(Course course) {
cDao.update(course);
}
/**
* 通过ID得到一个Course
* @return
*/
public Course getCourseById(int id) {
return cDao.getCourseById(id);
}
/**
* 通过Name得到一个Course
* @return
*/
public Course getCourseByName(String name) {
return cDao.getCourseByName(name);
}
/**
* 查找
* @return
*/
public List<Course> search(String name, String sex, String minzu,String zhuce, String age, String zhengzhi,String fuwu) {
return cDao.search( name, sex, minzu,zhuce, age, zhengzhi,fuwu);
}
/**
* 全部数据
* @return
*/
public List<Course> list() {
return cDao.list();
}
}
package com.hjf.servlet;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.hjf.entity.Course;
import com.hjf.service.CourseService;
@WebServlet("/CourseServlet")
public class CourseServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
CourseService service = new CourseService();
/**
* 方法选择
*/
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("utf-8");
String method = req.getParameter("method");
if ("add".equals(method)) {
add(req, resp);
} else if ("del".equals(method)) {
del(req, resp);
} else if ("update".equals(method)) {
update(req, resp);
} else if ("search".equals(method)) {
search(req, resp);
} else if ("getcoursebyid".equals(method)) {
getCourseById(req, resp);
} else if ("getcoursebyname".equals(method)) {
getCourseByName(req, resp);
} else if ("list".equals(method)) {
list(req, resp);
}
}
/**
* 添加
* @param req
* @param resp
* @throws IOException
* @throws ServletException
*/
private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
req.setCharacterEncoding("utf-8");
//获取数据
String name = req.getParameter("name");
String sex = req.getParameter("sex");
String minzu = req.getParameter("minzu");
String zhuce = req.getParameter("zhuce");
String age = req.getParameter("age");
String zhengzhi = req.getParameter("zhengzhi");
String fuwu = req.getParameter("fuwu");
Course course = new Course(name, sex, minzu,zhuce, age, zhengzhi,fuwu);
//添加后消息显示
if(service.add(course)) {
req.setAttribute("message", "添加成功");
req.getRequestDispatcher("add.jsp").forward(req,resp);
} else {
req.setAttribute("message", "课程名称重复，请重新录入");
req.getRequestDispatcher("add.jsp").forward(req,resp);
}
}
/**
* 全部
* @param req
* @param resp
* @throws ServletException
*/
private void list(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
List<Course> courses = service.list();
req.setAttribute("courses", courses);
req.getRequestDispatcher("list.jsp").forward(req,resp);
}
/**
* 通过ID得到Course
* @param req
* @param resp
* @throws ServletException
*/
private void getCourseById(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
int id = Integer.parseInt(req.getParameter("id"));
Course course = service.getCourseById(id);
req.setAttribute("course", course);
req.getRequestDispatcher("detail2.jsp").forward(req,resp);
}
/**
* 通过名字查找
* 跳转至删除
* @param req
* @param resp
* @throws IOException
* @throws ServletException
*/
private void getCourseByName(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
String name = req.getParameter("name");
Course course = service.getCourseByName(name);
if(course == null) {
req.setAttribute("message", "查无此课程！");
req.getRequestDispatcher("del.jsp").forward(req,resp);
} else {
req.setAttribute("course", course);
req.getRequestDispatcher("detail.jsp").forward(req,resp);
}
}
/**
* 删除
* @param req
* @param resp
* @throws IOException
* @throws ServletException
*/
private void del(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
int id = Integer.parseInt(req.getParameter("id"));
service.del(id);
req.setAttribute("message", "删除成功！");
req.getRequestDispatcher("del.jsp").forward(req,resp);
}
/**
* 修改
* @param req
* @param resp
* @throws IOException
* @throws ServletException
*/
private void update(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
int id = Integer.parseInt(req.getParameter("id"));
String name = req.getParameter("name");
String sex = req.getParameter("sex");
String minzu = req.getParameter("minzu");
String zhuce = req.getParameter("zhuce");
String age = req.getParameter("age");
String zhengzhi = req.getParameter("zhengzhi");
String fuwu = req.getParameter("fuwu");
Course course = new Course(id,name, sex, minzu,zhuce, age, zhengzhi,fuwu);
service.update(course);
req.setAttribute("message", "修改成功");
req.getRequestDispatcher("CourseServlet?method=list").forward(req,resp);
}
/**
* 查找
* @param req
* @param resp
* @throws ServletException
*/
private void search(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
String name = req.getParameter("name");
String sex = req.getParameter("sex");
String minzu = req.getParameter("minzu");
String zhuce = req.getParameter("zhuce");
String age = req.getParameter("age");
String zhengzhi = req.getParameter("zhengzhi");
String fuwu = req.getParameter("fuwu");
List<Course> courses = service.search(name, sex, minzu,zhuce, age, zhengzhi,fuwu);
req.setAttribute("courses", courses);
req.getRequestDispatcher("searchlist.jsp").forward(req,resp);
}
}
package com.hjf.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/**
* 数据库连接工具
* @author Hu
*
*/
public class DBUtil {
public static String db_url = "jdbc:mysql://localhost:3306/user";
public static String db_user = "root";
public static String db_pass = "root";
public static Connection getConn () {
Connection conn = null;
try {
Class.forName("com.mysql.jdbc.Driver");//加载驱动
conn = DriverManager.getConnection(db_url, db_user, db_pass);
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
/**
* 关闭连接
* @param state
* @param conn
*/
public static void close (Statement state, Connection conn) {
if (state != null) {
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public static void close (ResultSet rs, Statement state, Connection conn) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (state != null) {
try {
state.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) throws SQLException {
Connection conn = getConn();
PreparedStatement pstmt = null;
ResultSet rs = null;
String sql ="select * from course";
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
if(rs.next()){
System.out.println("空");
}else{
System.out.println("不空");
}
}
}
是要实现部门管理的后台业务处理呢，还是只需要前台页面呢。后台的话无非就是和数据库交互，对数据实现增删改查即可，这个应该没有问题。前台的话，可以参考这位博主的:
https://blog.csdn.net/qq_41071754/article/details/130020396
写的很详细，应该对你有帮助
这个是比较复杂的哦，要连接数据库、还要面向前端提供接口，一般建议使用spring boot进行开发，数据库可以使用mysql
由于后端部门需要处理复杂的技术任务，并涉及到数据库、服务器和应用架构的管理，因此其管理代码的实现可能较为复杂。以下是一份 Python3 实现的代码示例，仅供参考：
from datetime import datetime
import random
class Employee:
def __init__(self, emp_id, emp_name):
self.id = emp_id
self.name = emp_name
self.status = "Idle"
def work_on_task(self, task):
self.status = "Working"
task.status = "In Progress"
task.worker = self
def complete_task(self, task):
task.status = "Completed"
task.worker = None
self.status = "Idle"
class Task:
def __init__(self, task_id, task_name, assignee=None):
self.id = task_id
self.name = task_name
self.status = "Unassigned"
self.worker = assignee
def assign_to(self, employee):
if self.status == "Unassigned":
self.status = "Assigned"
else:
self.status = "Reassigned"
self.worker.status = "Idle"
self.worker = employee
def __str__(self):
if self.worker:
return f"Task {self.id}: {self.name} (Status: {self.status}, Worker: {self.worker.name})"
else:
return f"Task {self.id}: {self.name} (Status: {self.status}, Worker: None)"
class Manager:
def __init__(self, emp_list):
self.employees = emp_list
self.tasks = []
def create_task(self, task_name):
task_id = len(self.tasks) + 1
return Task(task_id, task_name)
def hire_employee(self, emp_name):
emp_id = len(self.employees) + 1
emp = Employee(emp_id, emp_name)
self.employees.append(emp)
return emp
def assign_task(self, task):
available_employees = [emp for emp in self.employees if emp.status == "Idle"]
if not available_employees:
task.status = "Unassigned"
return
random_employee = random.choice(available_employees)
random_employee.work_on_task(task)
task.assign_to(random_employee)
def complete_task(self, task):
if task.worker is not None and task.status == "In Progress":
task.worker.complete_task(task)
elif task.worker is None and task.status == "Assigned":
task.status = "Unassigned"
if __name__ == '__main__':
emp1 = Employee(1, "Employee1")
emp2 = Employee(2, "Employee2")
emp3 = Employee(3, "Employee3")
emp_list = [emp1, emp2, emp3]
manager = Manager(emp_list)
task1 = manager.create_task("Build database schema")
task2 = manager.create_task("Configure server settings")
task3 = manager.create_task("Implement REST API")
manager.assign_task(task1)
manager.assign_task(task2)
manager.assign_task(task3)
manager.complete_task(task1)
manager.assign_task(task2)
manager.complete_task(task2)
manager.assign_task(task3)
manager.complete_task(task3)
for task in manager.tasks:
print(task)
该代码实现了一个简单的员工、任务和部门经理的管理模型，可以根据需要进行扩展。
后端管理页面代码还是比较简单的
写什么，用什么框架，三条内完成可行？
写完了吗
还有需要吗？可以私信一下，这个可以帮你解决。