java如何使用jsp和servlet更新数据库中的多个记录

1 年，5 月 Questions & Answers 6681

可编辑格式。jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
   <%@page import ="techpanel.Getters" %>
    <%@page import="java.util.Vector" %>


<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Panel Details</title>
</head>

<%Vector<Getters> vec=(Vector<Getters>)request.getAttribute("vec"); %>

<h1>Technical Panel</h1>



<center>
<table width="80" id="customers" id="Add">


<tr>
<form action="UpdateTechpanelDetails" method="Post">

<td>Employee ID</td>

<th><u>First Name</td>

<th><u>Last Name</u></th>
<th><u>Mobile No</u></th>

<th><u>Email ID</u></th>

<th><u>Skills</u></th>

</tr>

 <% 
for(int i=0;i<vec.size();i++)
 {%>

<tr>
 <td><input type="text" name="EmployeeID" value=" %=vec.elementAt(i).getEmployeeID()%>"/> </td>
 <td><input type="text" name="FirstName" value="<%=vec.elementAt(i).getFirstName()%>"/> </td>
<td><input type="text" name="LastName" value="<%=vec.elementAt(i).getLastName()%>"/></td>
<td><input type="text" name="MobileNo" value="<%=vec.elementAt(i).getMobileNo()%>"/></td>
<td><input type="text" name="EmailID" value="<%=vec.elementAt(i).getEmailID()%>"/></td>
<td><input type="text" name="PanelPersonSkills" value="<%=vec.elementAt(i).getPanelPersonSkills()%>"/></td>
</tr>
<tr>

}
</table>
<br><br>
<center><table>
<tr>
 <td><input type="submit"    value="Update"  /></td></form>
<td><form action="RetrievingTechpanelDetails"><input type="submit" name="button"  value="Back"></form></td>
</tr>
</table>
</body>
</html>

UpdateTechpanelDetails。爪哇

package techpanel;

import java.io.IOException;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;


public class UpdateTechpanelDetails extends HttpServlet {

    public UpdateTechpanelDetails() {
        super();
        }


    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {



         String Eid = request.getParameter("EmployeeID");
         System.out.println(Eid);
        String FName = request.getParameter("FirstName");
        System.out.println(FName);
        String LName = request.getParameter("LastName");
        System.out.println(LName);
        String MNo = request.getParameter("MobileNo");
        System.out.println(MNo);
        String EID = request.getParameter("EmailID");
        System.out.println(EID);
        String Skills = request.getParameter("PanelPersonSkills");
        System.out.println(Skills);

        String msg=("Data Updated");
        Connection con=null; 
         PreparedStatement st=null;
       try {
          Class.forName("com.mysql.jdbc.Driver");
            con = DriverManager.getConnection("jdbc:mysql://localhost:3306?user=root&password=kartheek");
         String sql = " UPDATE techpanel1.techpaneldetails SET EmployeeID=?,FirstName=?,LastName=?,MobileNo=?,EmailID=?,PanelPersonSkills=? WHERE EmployeeID=?";

        con.setAutoCommit(false);
          st = con.prepareStatement(sql);

         st.setString(1, Eid); 
         st.setString(2, FName ); 
         st.setString(3, LName); 
         st.setString(4, MNo ); 
         st.setString(5, EID );
         st.setString(6, Skills );
         st.setString(7, Eid); 



        st.executeUpdate();

        con.commit();
        request.setAttribute(".", msg);
         con.close();
         st.close();
                RequestDispatcher rd = request.getRequestDispatcher("AddingTechpanelDetails.jsp");
              rd.include(request, response);
        }

        catch (Exception e) {
         e.printStackTrace();

        }

       }


    private int getInitParameter() {
        // TODO Auto-generated method stub
        return 0;
    }

  }

主要问题

我已经将向量array(vec.elementAt(i).getEmployeeID(),vec.elementAt(i).getFirstName())中的值从数据库中提取到一个文本框中，该文本框是可编辑的format(input type="text" name=EmployeeID value=<%=vec.elementAt(i).getEmployeeID()%>/>)，我想将多个记录更新到数据库中。但只有第一条记录得到更新。。保留或不更新。有人能帮我吗

共 (2) 个答案

# 1 楼答案

使用批处理，您可以插入或更新记录数。请尝试此代码

 String sql = "update people set firstname=? , lastname=? where id=?";


PreparedStatement preparedStatement = null;
try{
    preparedStatement =
            connection.prepareStatement(sql);

preparedStatement.setString(1, "Gary");
preparedStatement.setString(2, "Larson");
preparedStatement.setLong  (3, 123);

preparedStatement.addBatch();

preparedStatement.setString(1, "Stan");
preparedStatement.setString(2, "Lee");
preparedStatement.setLong  (3, 456);

preparedStatement.addBatch();

int[] affectedRecords = preparedStatement.executeBatch();

}finally {
    if(preparedStatement != null) {
        preparedStatement.close();
    }
}

# 2 楼答案

要获取所有文本框的值，请使用request.getParameterValues('name')，这将返回具有相同“名称”的元素的所有值 String[] employeeID = request.getPrameterValues('EmployeeID')将所有名为“EmployeeID”的文本框值返回到字符串数组EmployeeID中，您可以迭代该数组并从textBox中获取每个值

要更新多行，请尝试使用prepared stationsaddBatch()方法，然后使用executeBatch()方法执行批处理语句

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