From a52e0ff94a7cce2780aea88ffbc40cc79b0a7acf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=99=88=E4=BD=B3=E7=82=9C?= <626104790@qq.com>
Date: Thu, 8 Jun 2023 12:04:35 +0800
Subject: [PATCH] =?UTF-8?q?=E5=AD=A6=E5=8B=A4=E8=80=83=E5=AF=9F=E4=BD=9C?=
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---
 ...24\346\254\241\344\275\234\344\270\232.md" | 421 ++++++++++++++++++
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 create mode 100644 "26 \351\231\210\344\275\263\347\202\234/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232.md"

diff --git "a/26 \351\231\210\344\275\263\347\202\234/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232.md" "b/26 \351\231\210\344\275\263\347\202\234/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232.md"
new file mode 100644
index 0000000..29683b9
--- /dev/null
+++ "b/26 \351\231\210\344\275\263\347\202\234/\347\254\254\344\272\224\346\254\241\344\275\234\344\270\232.md"	
@@ -0,0 +1,421 @@
+```
+create database AttDB charset utf8;
+use AttDB;
+#     表： Student (学生表)
+#     字段名	数据类型	默认值	备注和说明
+
+
+create table Student(
+    sid int primary key auto_increment,# 主键,自动增长列
+    sname varchar(20)  not null unique# 唯一,非空
+);
+#     表：Attence (考勤表)
+#     字段名	数据类型	默认值	备注和说明
+create table Attence (
+    aid int primary key auto_increment,#主键,自动增长列
+    time varchar(20) not null ,#非空
+    type int comment '1:已到；2:迟到；3旷课',#1:已到；2:迟到；3旷课
+    sid int ,# 外键
+    foreign key (sid) references Student(sid)
+);
+insert into Student VALUES
+                        (1,'张三'),
+                        (2,'李四'),
+                        (3,'王五'),
+                        (4,'老六'),
+                        (5,'老八');
+insert into Attence values
+                        (1,'2022-05-20 08:20:00',1,1),
+                        (2,'2022-05-23 09:20:00',2,1),
+                        (3,'2022-05-20 08:20:00',2,2),
+                        (4,'2022-05-22 08:20:00',3,2),
+                        (5,'2022-05-23 08:20:00',2,3);
+
+
+
+
+```
+
+```
+package bean;
+
+
+
+public class Attence {
+
+  private int aid;
+
+  private String time;
+
+  private int type;
+
+  private int sid;
+
+  private String sname;
+
+
+
+  public Attence(int aid, String time, int type, int sid, String sname) {
+
+​    this.aid = aid;
+
+​    this.time = time;
+
+​    this.type = type;
+
+​    this.sid = sid;
+
+​    this.sname = sname;
+
+  }
+
+
+
+  public Attence() {
+
+  }
+
+
+
+  public int getAid() {
+
+​    return aid;
+
+  }
+
+
+
+  public void setAid(int aid) {
+
+​    this.aid = aid;
+
+  }
+
+
+
+  public String getTime() {
+
+​    return time;
+
+  }
+
+
+
+  public void setTime(String time) {
+
+​    this.time = time;
+
+  }
+
+
+
+  public int getType() {
+
+​    return type;
+
+  }
+
+
+
+  public void setType(int type) {
+
+​    this.type = type;
+
+  }
+
+
+
+  public int getSid() {
+
+​    return sid;
+
+  }
+
+
+
+  public void setSid(int sid) {
+
+​    this.sid = sid;
+
+  }
+
+
+
+  public String getSname() {
+
+​    return sname;
+
+  }
+
+
+
+  public void setSname(String sname) {
+
+​    this.sname = sname;
+
+  }
+
+
+
+  @Override
+
+  public String toString() {
+
+​    return "Attence{" +
+
+​        "aid=" + aid +
+
+​        ", time='" + time + '\'' +
+
+​        ", type=" + type +
+
+​        ", sid=" + sid +
+
+​        ", sname='" + sname + '\'' +
+
+​        '}';
+
+  }
+
+}
+
+
+
+package bean;
+
+
+
+public class Student {
+
+  private int sid;
+
+  private String sname;
+
+
+
+  @Override
+
+  public String toString() {
+
+​    return "Student{" +
+
+​        "sid=" + sid +
+
+​        ", sname='" + sname + '\'' +
+
+​        '}';
+
+  }
+
+
+
+  public int getSid() {
+
+​    return sid;
+
+  }
+
+
+
+  public void setSid(int sid) {
+
+​    this.sid = sid;
+
+  }
+
+
+
+  public String getSname() {
+
+​    return sname;
+
+  }
+
+
+
+  public void setSname(String sname) {
+
+​    this.sname = sname;
+
+  }
+
+
+
+  public Student() {
+
+  }
+
+
+
+  public Student(int sid, String sname) {
+
+​    this.sid = sid;
+
+​    this.sname = sname;
+
+  }
+
+}
+
+
+```
+
+```
+package utils;
+
+
+
+import java.sql.*;
+
+
+
+public class DBUtil {
+
+  static String url="jdbc:mysql///AttDB?useSSL=false&characterEncoding=utf8";
+
+  static String user="root";
+
+  static String pwd="root";
+
+  static {
+
+​    try {
+
+​      Class.forName("com.mysql.jdbc.Driver");
+
+​    } catch (ClassNotFoundException e) {
+
+​      e.printStackTrace();
+
+​    }
+
+  }
+
+  public static Connection getConn() throws SQLException {
+
+​    Connection conn = DriverManager.getConnection(url, user, pwd);
+
+​    return conn;
+
+  }
+
+  public static ResultSet query(String sql,Object... keys){
+
+​    ResultSet rs = null;
+
+​    try {
+
+​      Connection conn = getConn();
+
+​      PreparedStatement pst = conn.prepareStatement(sql);
+
+​      for (int i = 0; i < keys.length; i++) {
+
+​        pst.setObject((i+1),keys[i]);
+
+​      }
+
+​      rs = pst.executeQuery();
+
+​    } catch (SQLException e) {
+
+​      throw new RuntimeException(e);
+
+​    }
+
+​    return rs;
+
+  }
+
+}
+```
+
+```
+package servlet;
+
+import utils.DBUtil;
+
+import javax.servlet.*;
+import javax.servlet.http.*;
+import javax.servlet.annotation.*;
+import java.io.IOException;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+
+@WebServlet("/List")
+public class ListServlet extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+
+        String sql ="select * from attence a,student s where a.sid=s.sid";
+        ResultSet res = DBUtil.query(sql);
+        ArrayList<Attence> list = new ArrayList<>();
+        try {
+            while (res.next()){
+                int aid = res.getInt("aid");
+                String time = res.getString("time");
+                int type = res.getInt("type");
+                int sid = res.getInt("sid");
+                String sname = res.getString("sname");
+                Attence attence = new Attence(aid, time, type, sid, sname);
+                list.add(attence);
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        request.setAttribute("list",list);
+        request.getRequestDispatcher("/WEB-INF/list.jsp").forward(request,response);
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+
+    }
+}
+```
+
+```
+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>考勤</title>
+</head>
+<body>
+<a href="">添加</a>
+<table border="1">
+  <tr>
+    <th>考勤编号</th>
+    <th>学生编号</th>
+    <th>学生姓名</th>
+    <th>出勤时间</th>
+    <th>出勤状况</th>
+  </tr>
+  <c:forEach items="${list}" var="l">
+    <tr>
+      <td>${a.aid}</td>
+      <td>${a.sid}</td>
+      <td>${a.sname}</td>
+      <td>${a.time}</td>
+      <td>
+        <c:if test="${a.type==1}">
+          已到
+        </c:if>
+        <c:if test="${a.type==2}">
+          迟到
+        </c:if>
+        <c:if test="${a.type==3}">
+          旷课
+        </c:if>
+      </td>
+    </tr>
+  </c:forEach>
+
+
+</table>
+</body>
+</html>
+```
+
-- 
Gitee