有一个包含不同列的表。想要通过单击按钮
来更新特定的列我想要做什么，我只是使用了按钮的onclick（），在该按钮中传递了servelet文件并更新了列。但会更新所有列。所以基本上我想传递特定行的ID，以便按钮将获取ID并更新特定行。
ServeletApprove.java
import java.sql.*;
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/ServletApprove")
public class ServletApprove extends HttpServlet
{
private static final long serialVersionUID = 1L;
public ServletApprove()
{
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
PrintWriter out=response.getWriter();
//jdbc code for connectivity with oracle database.
try
{
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","system","up78cp5317");
Statement stmt=con.createStatement();
stmt.executeUpdate("UPDATE APPROVAL SET STATUS='approved'");
out.println("<script type=\"text/javascript\">");
out.println("alert('your submission has been successfully approved');");
out.println("location='approval_pg.jsp';");
out.println("</script>");
//String sql = "UPDATE APPROVAL SET STATUS='approved' WHERE EMAIL='"+EMAIL+"'";
//stmt.executeUpdate(sql);
//out.close();
//stmt.executeUpdate("UPDATE APPROVAL SET STATUS='approved' WHERE EMAIL='e'");
}
catch (Exception e2)
{
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
}
}
approval_page.jsp
<%
// String name = request.getParameter( "username" );
// session.setAttribute( "theName", name );
%>
<html>
<head>
<meta name="viewport" content="width=device-width,initial-scale=1.0"/>
<link href="empcss.css" type="text/css" rel="stylesheet"/>
<style>
* {
box-sizing: border-box;
}
body
{
font-family: Arial, Helvetica, sans-serif;
}
.form-popup {
display: none;
}
/* Style the header */
header
{
background-color: #666;
/*opacity:0.7;*/
background: rgba(0, 0, 0, 0.4);
padding: 30px;
text-align: center;
font-size: 45px;
color: white;
}
/* Container for flexboxes */
section
{
background: rgba(0, 0, 0, 0.1);
display: -webkit-flex;
text-align: center;
display: flex;
}
/* Style the navigation menu */
nav
{
-webkit-flex: 1;
-ms-flex: 1;
flex: 0.5;
background: #ccc;
padding: 20px;
background: rgba(0, 0, 0, 0.2);
}
/* Style the list inside the menu */
nav ul
{
list-style-type: none;
padding: 0;
}
/* Style the content */
article
{
-webkit-flex: 3;
-ms-flex: 3;
flex: 3;
background-color: #f1f1f1;
/*opacity:0.7;*/
background: rgba(0, 0, 0, 0.1);
padding: 50px;
}
.button1 {
background-color: #4CAF50; /* Green */
}
.button2 {background-color: #f44336;} /* Red */
/* Responsive layout - makes the menu and the content (inside the section) sit on top of each other instead of next to each other */
@media (max-width: 600px)
{
section
{
-webkit-flex-direction: column;
flex-direction: column;
}
}
</style>
</head>
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<%@ page import="java.util.*"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<body>
<%
response.setHeader("Cache-control","no-cache");
response.setHeader("Cache-control","no-store");
response.setHeader("Pragma","no-cache");
response.setDateHeader("Expire", 0);
String appemails=(String)session.getAttribute("emails");
/*if(emails==null)
{
System.out.println(emails);
response.sendRedirect("logout.jsp");
}
*/
%>
<form action="./ServletApprove">
<a href="logout.jsp"><img src="licon.jpg" height="35" width="35" align="right"></a>
<p class="form_label"><h2>Welcome:<%out.println(appemails);%></h2></p>
<header>
<h3>Approval Authority Corner</h3>
</header>
<section>
<nav>
<ul>
<li>
<button type="button" value="Get All Record" class="open-button" onclick="openForm()" style="width:70px;
height:40px;
margin:5px;
border:none;
border-radius:2px;
font-size:17px;
font-weight:bold;">View</button>
<button type="button" class="btn cancel" onclick="closeForm()" style="width:70px;
height:40px;
margin:5px;
border:none;
border-radius:2px;
font-size:17px;
font-weight:bold;">Close</button>
</li>
</ul>
</nav>
<article>
<h1 style="color:white; font-size: 20px;">Travel Records</h1>
<div class="form-popup" id="myForm" style="height:200px;width:1180px;overflow:scroll;overflow-y:scroll;overflow-x:hidden;">
<table style="border:black;color:white; font-family: Arial, Helvetica, sans-serif; font-size:10px; font-weight:bold;" border="5" cellpadding="5" cellspacing="1" >
<tr>
<td>ID</td>
<td>NAME</td>
<td>FUNC</td>
<td>MANAGER</td>
<td>PURPOSE</td>
<td>PNAME</td>
<td>MEETING</td>
<td>REQDATE</td>
<td>STARTDATE</td>
<td>ENDDATE</td>
<td>SOURCE</td>
<td>DEST</td>
<td>CDATE</td>
<td>CID</td>
<td>REMARKS</td>
<td>STATUS</td>
<td>CHECK</td>
</tr>
<%
try
{
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe","system","up78cp5317");
//String url="jdbc:oracle:thin:@localhost:1521:xe";
//String username="system";
//String password="up78cp5317";
String query="select * from APPROVAL";
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery(query);
while(rs.next())
{
%>
<tr>
<td><%=rs.getString("ID") %></td>
<td><%=rs.getString("FULLNAME") %></td>
<td><%=rs.getString("FUNCTION") %></td>
<td><%=rs.getString("RESOURCEMANAGER") %></td>
<td><%=rs.getString("PURPOSEOFTRAVEL") %></td>
<td><%=rs.getString("PROJECTNAME") %></td>
<td><%=rs.getString("MEETINGDETAILS") %></td>
<td><%=rs.getString("REQUESTDATE") %></td>
<td><%=rs.getString("TRAVELSTARTDATE") %></td>
<td><%=rs.getString("TRAVELENDDATE") %></td>
<td><%=rs.getString("TRAVELSOURCE") %></td>
<td><%=rs.getString("TRAVELDESTINATION") %></td>
<td><%=rs.getString("CONCURDATE") %></td>
<td><%=rs.getString("CONCURID") %></td>
<td><%=rs.getString("ANYREMARKS") %></td>
<td><%=rs.getString("STATUS") %></td>
<td><button type="button" class="button1" value="approve" onclick="location.href='ServletApprove'" style="width:60px;
height:20px;
border:none;
border-radius:6px;
font-size:10px;
font-weight:bold;">Approve</button>
<button type="button" class="button2" value="reject" onclick="location.href='ServletReject'" style="width:60px;
height:20px;
border:none;
border-radius:6px;
font-size:10px;
font-weight:bold;">Reject</button>
</td>
</tr>
<%
}
%>
<%
rs.close();
stmt.close();
con.close();
}
catch(Exception e)
{
e.printStackTrace();
}
%>
</table>
</div>
</article>
<script>
function openForm()
{
document.getElementById("myForm").style.display = "block";
}
function closeForm()
{
document.getElementById("myForm").style.display = "none";
}
</script>
</section>
</form>
</body>
</html>
答案 0 :(得分：0)
在Jsp中，在参数中附加ID，如下所示：
<button type="button" class="button1" value="approve" onclick="location.href='ServletApprove?ID=<%=rs.getString("ID") %>'"
然后在您的servlet中从请求中获取该附加ID，并将其附加到查询中，如下所示：
String id = request.getParameter("ID");
Statement stmt=con.createStatement();
stmt.executeUpdate("UPDATE APPROVAL SET STATUS='approved' WHERE ID="+id);// Parse id into integer if needed.