web 实验三通过js的数据库操作
2022/5/28 2:19:34
本文主要是介绍web 实验三通过js的数据库操作，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
基于js的数据库操作
代码如下：
css文件：
body {
text-align: center;
}
table {
width: 400px;
border: 1px solid #696969;
border-collapse: collapse;
margin:0 auto;
}
th {
border: 1px solid #696969;
background-color: #FFF8DC;
}
td {
text-align: center;
border: 1px solid #696969;
height: 50px;
background-color: #E0FFFF;
}
input {
font-size: 20px;
}
index.jsp文件
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@page import="java.sql.*" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图书管理系统</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<h1>学生管理系统</h1>
<a href="add.jsp">添加学生信息</a>
<br />
<br />
<table style="width: 50%;">
<tr>
<th>学号</th>
<th>姓名</th>
<th>性别</th>
<th>生日</th>
<th>管理</th>
</tr>
<%
Class.forName("com.mysql.jdbc.Driver");
String db_url="jdbc:mysql://localhost:3306/lab03?uerUnicode=true&characterEncoding=UTF-8";
String db_user="root";
String db_password="123456";
Connection con=DriverManager.getConnection(db_url,db_user,db_password);
//使用Statement对象
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select * from students");
/*
PreparedStatement stmt = con.prepareStatement("select * from bookinfo");
ResultSet rs = stmt.executeQuery();
*/
while (rs.next()) {
String id = rs.getString(2);
out.println("<tr><td>" + rs.getString(2) + "</td><td>" + rs.getString(1) +"</td><td>" + rs.getString(3) + "</td><td>"
+ rs.getString(4) + "</td><td><a href='change.jsp?id=" + id
+ "'>修改</a> <a href='delete.jsp?id=" + id + "'>删除</a></td></tr>");
}
rs.close();
stmt.close();
con.close();
%>
</table>
<br />
<hr />
<div style="text-align: center; width: 100%; font-size: 12px; color: #333;">
©版权所有：石家庄铁道大学信息科学与技术学院
</div>
</body>
</html>
add.jsp文件
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" errorPage="error.jsp"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>添加学生信息</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<form action="addsql.jsp" method="post">
<h2>添加学生信息</h2>
<table style="width: 50%">
<tr>
<th width="30%">学号：</th>
<td width="70%"><input name="id" type="text"></td>
</tr>
<tr>
<th>姓名：</th>
<td><input name="name" type="text"></td>
</tr>
<tr>
<th>性别：</th>
<td><input name="sex" type="radio" value="男">男
<input name="sex" type="radio" value="女">女 </td>
</tr>
<tr>
<th>生日：</th>
<td><input name="year" type="text" style="width:60px;">年<input name="month" type="text" style="width:40px;">月<input name="day" type="text" style="width:40px;">日</td>
</tr>
<tr>
<td colspan="2"><input type="submit" name="submit" value="添加"> <input type="reset" value="重置"></td>
</tr>
</table>
</form>
</body>
</html>
addsql.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@page import="java.sql.*" %>
<%@ page errorPage="error.jsp"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>添加学生信息</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String id = request.getParameter("id");
String name = request.getParameter("name");
String sex = request.getParameter("sex");
String year =request.getParameter("year");
String month =request.getParameter("month");
String day =request.getParameter("day");
String birthday=year+"/"+month+"/"+day;
Class.forName("com.mysql.jdbc.Driver");
String db_url="jdbc:mysql://localhost:3306/lab03?uerUnicode=true&characterEncoding=UTF-8";
String db_user="root";
String db_password="123456";
Connection con=DriverManager.getConnection(db_url,db_user,db_password);
PreparedStatement stmt = con.prepareStatement("insert into students(id,name,sex,birthday) values(?, ?, ?,?)");
stmt.setString(1, id);
stmt.setString(2, name);
stmt.setString(3, sex);
stmt.setString(4, birthday);
int i = stmt.executeUpdate();
if (i == 1) {
out.println("<h2>添加成功！</h2><br/>");
out.println("<a href='index.jsp'>返回首页</a>");
} else {
out.println("<h2>添加失败！</h2><br/>");
out.println("<a href='add.jsp'>重新添加</a>");
}
stmt.close();
con.close();
%>
</body>
</html>
change.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@page import="java.sql.*" %>
<%@ page errorPage="error.jsp"%>
<!DOCTYPE html>
<html>
<head>
<title>修改学生信息</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String id = request.getParameter("id");
Class.forName("com.mysql.jdbc.Driver");
String db_url="jdbc:mysql://localhost:3306/lab03?uerUnicode=true&characterEncoding=UTF-8";
String db_user="root";
String db_password="123456";
Connection con=DriverManager.getConnection(db_url,db_user,db_password);
//使用Statement对象
//Statement stmt = con.createStatement();
//ResultSet rs = stmt.executeQuery("select * from bookinfo where id=" + id);
PreparedStatement stmt = con.prepareStatement("select * from students where id=?");
stmt.setString(1, id);
ResultSet rs = stmt.executeQuery();
rs.next();
%>
<%
String birthday=rs.getString(4);
String res[]=birthday.split("/");
String year=res[0];
String month=res[1];
String day=res[2];
%>
<form action="changesql.jsp" method="post">
<h2>修改图书信息</h2>
<table style="width:50%">
<tr>
<th width="30%">学号：</th>
<td width="70%"><input name="id" type="text"
value="<%=rs.getString(2)%>" readonly></td>
</tr>
<tr>
<th>姓名：</th>
<td><input name="name" type="text"
value="<%=rs.getString(1)%>"></td>
</tr>
<tr>
<th>性别：</th>
<%
if ("男 ".equals(rs.getString(3)))
{
System.out.println(rs.getString(3));
out.println("<td><input name='sex' type='radio' value='男' checked>男 "
+ "<input name='sex' type='radio' value='女'>女 </td>");
}
if ("女 ".equals(rs.getString(3))){
System.out.println(rs.getString(3));
out.println("<td><input name='sex' type='radio' value='男' >男 "
+ "<input name='sex' type='radio' value='女' checked>女 </td>");}
%>
</tr>
<tr>
<th>生日：</th>
<th>
<input name="year" type="text"
style="width:60px;" value="<%=year%>" >年
<input name="month" type="text"
style="width:40px;" value="<%=month%>">月
<input name="day" type="text"
style="width:40px;" value="<%=day%>">日
</th>
</tr>
<tr>
<td colspan="2"><input type="hidden" name="id" value="<%=id%>">
<input type="submit" value="修改"> <input type="reset"
value="重置"></td>
</tr>
</table>
</form>
<%
rs.close();
stmt.close();
con.close();
%>
</body>
</html>
changesql.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@page import="java.sql.*" %>
<%@ page errorPage="error.jsp"%>
<!DOCTYPE html>
<html>
<head>
<title>修改完成</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String id = request.getParameter("id");
String name = request.getParameter("name");
String sex = request.getParameter("sex");
String year =request.getParameter("year");
String month =request.getParameter("month");
String day =request.getParameter("day");
String birthday=year+"/"+month+"/"+day;
Class.forName("com.mysql.jdbc.Driver");
String db_url="jdbc:mysql://localhost:3306/lab03?uerUnicode=true&characterEncoding=UTF-8";
String db_user="root";
String db_password="123456";
Connection con=DriverManager.getConnection(db_url,db_user,db_password);
Statement stmt = con.createStatement();
String sql = "update students set id='" + id + "',name='" + name + "',sex='" + sex
+ " 'where id=" + id;
System.out.println(sql);
int i = stmt.executeUpdate(sql);
if (i == 1) {
out.println("<h2>修改成功！</h2><br/>");
out.println("<a href='index.jsp'>返回首页</a>");
} else {
out.println("<h2>修改失败！</h2><br/>");
out.println("<a href='edit.jsp?id='" + id + ">重新添加</a>");
}
stmt.close();
con.close();
%>
</body>
</html>
delete.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@page import="java.sql.*" %>
<%@ page errorPage="error.jsp"%>
<!DOCTYPE html>
<html>
<head>
<title>删除学生信息</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
Class.forName("com.mysql.jdbc.Driver");
String db_url="jdbc:mysql://localhost:3306/lab03?uerUnicode=true&characterEncoding=UTF-8";
String db_user="root";
String db_password="123456";
Connection con=DriverManager.getConnection(db_url,db_user,db_password);
Statement stmt=con.createStatement();
String id=request.getParameter("id");
int i=stmt.executeUpdate("delete from students where id="+id);
if(i==1)
{
out.println("<h2>删除成功！</h2><br/>");
}
else
{
out.println("<h2>删除失败！</h2><br/>");
}
out.println("<a href='index.jsp'>返回首页</a>");
stmt.close();
con.close();
%>
</body>
</html>
error.jsp
<%@ page language="java" isErrorPage="true" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>error page</title> </head> <body> <h1>程序出现错误</h1> <div>错误信息为：<br/> <%=exception.getMessage()%><br/> <%=exception.toString()%> </div> </body> </html>
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