我正在寻求更新记录，但找不到记录无法正常工作的原因。相同的方法可以很好地将记录添加到MySQL数据库。没有错误发生，页面刷新，但记录未在数据库中更新。在下面，您将看到代码。任何帮助将不胜感激。
JSP页面
<%@page import="Basic.DBManager"%>
<%@page import="Model.Test"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page language="java" import="java.sql.*" %>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html lang="en">
<div class="container">
<div class="row">
<div class="col-lg-12">
<h4>Pending Variation Requests</h4>
<div class="row">
<form class="center" name="updaterequest" id="form" action="updateRequestServlet" method="POST">
<table class="table">
<tbody>
<%
String clientId=session.getAttribute("clientId").toString();
DBManager dbmgr = new DBManager();
Connection connection = dbmgr.getConnection();
Statement statement = null;
ResultSet resultSet = null;
%>
<tr>
</tr>
<tr>
<td><b>Date</b></td>
<td><b>Request ID</b></td>
<td><b>Title</b></td>
<td><b>Relevant Stage</b></td>
<td><b>Request information</b></td>
<td><b>Quote</b></td>
<td><b>Status</b></td>
<td><b>Update</b></td>
</tr>
<%
try{
statement=connection.createStatement();
String sql ="SELECT * FROM request WHERE client_id= " + clientId + " and request_status='Pending'";
resultSet = statement.executeQuery(sql);
while(resultSet.next()){
%>
<tr>
<td><%=resultSet.getString("request_date") %></td>
<td><%=resultSet.getString("request_id") %></td>
<td><%=resultSet.getString("request_title") %></td>
<td><%=resultSet.getString("request_stage") %></td>
<td><%=resultSet.getString("request_info") %></td>
<td><%=resultSet.getString("request_quotation")%></td>
<td><%=resultSet.getString("request_status") %></td>
<td><select name="status" >
<option value="Approved">Approve</option>
<option value="Rejected">Reject</option>
</select></td>
</tr>
<%
}
connection.close();
} catch (Exception e) {
e.printStackTrace();
}
%>
</tbody>
</table>
<div class="col-sm-6 col-lg-6">
<div class="wrap" align="right">
<button type="submit"> Submit </button>
</div>
</div>
</form>
</div>
</div>
</div>
</div>
调用updateRequestServlet.java
package Servlets;
import Manager.RequestManager;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class updateRequestServlet extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession();
String clientId =session.getAttribute("clientId").toString();
String status = request.getParameter("status");
RequestManager rMgr = new RequestManager();
rMgr.updateRequest(clientId, status);
RequestDispatcher rd = request.getRequestDispatcher("/Requests.jsp");
rd.forward(request, response);
}
}
然后转到RequestManager.java
package Servlets;
import Manager.RequestManager;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class updateRequestServlet extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession();
String clientId =session.getAttribute("clientId").toString();
String status = request.getParameter("status");
RequestManager rMgr = new RequestManager();
rMgr.updateRequest(clientId, status);
RequestDispatcher rd = request.getRequestDispatcher("/Requests.jsp");
rd.forward(request, response);
}
}
最后在RequestDAO.java中调用updateRequest
package DAO;
import Model.Request;
import Basic.DBManager;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Vector;
import java.util.logging.Level;
import java.util.logging.Logger;
public class RequestDAO {
//inserting a new request into the request table
public void newRequest(String clientId, String requestname, String stage, String info) {
String stmtNewRequest = "INSERT INTO request(client_id, request_title, request_stage, request_info)\n VALUES('" + clientId + "', '" + requestname + "', '" + stage + "', '" + info + "')";
DBManager dbm = new DBManager();
Connection con = dbm.getConnection();
executeSqlScript(con, stmtNewRequest);
}
//inserting an update request into the request table
public void updateRequest(String clientId, String status) {
String updateRequest = "UPDATE request SET request_status=" + status + "WHERE clientId= "+ clientId ;
DBManager dbm = new DBManager();
Connection con = dbm.getConnection();
executeSqlScript(con, updateRequest);
}
public void executeSqlScript(Connection conn, String stmtRequest) {
Logger logger = Logger.getLogger(DBManager.class.getName());
// Loop through the SQL statements
Statement currentStatement = null;
// Get statement
String rawStatement = stmtRequest;
try {
// Execute statement
currentStatement = conn.createStatement();
currentStatement.execute(rawStatement);
} catch (SQLException sqlExcept) {
logger.log(Level.SEVERE, null, sqlExcept);
}
}
}