📄 class_modify_db.jsp
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<%@ page language="java" import="java.sql.*" contentType="text/html;charset=gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'class_modify_db.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<jsp:useBean id="test1" scope="application" class="test.Connect_db"/>
<body>
<%
Connection con=test1.getConnection();
int semester_id=Integer.parseInt(request.getParameter("semester_id"));
String cname=request.getParameter("cname");
String new_cname=new String(cname.getBytes("ISO-8859-1"),"gb2312");
String major=request.getParameter("major");
String new_major=new String(major.getBytes("ISO-8859-1"),"gb2312");
String sql1="select c_id from course where cname=?";
PreparedStatement ps1=con.prepareStatement(sql1);
ps1.setString(1,new_cname);
out.print(new_cname);
ResultSet rs1=ps1.executeQuery();
rs1.next();
String c_id=rs1.getString(1);
// out.print(c_id);
String sql="update course_arrangement set c_id=? where major=? and semester_id=?";
PreparedStatement ps=con.prepareStatement(sql);
ps.setString(1,c_id);
// String major=request.getParameter("major");
// out.print(major);
// String new_major=new String(major.getBytes("ISO-8859-1"),"GB2312");
ps.setString(2,new_major);
out.print(new_major);
ps.setInt(3,semester_id);
ps.executeUpdate();
out.print("更新成功．");
%>
</body>
</html>
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