[英]Insert time and date in MySQL database using jsp,bean class and servlet
[英]How to insert value in database using bean class in jsp?
嗨,我要使用jsp形式的bean類在數據庫中插入值,我能夠做到這一點,但是每當我在表null值中插入值時,我也會遇到一點問題,但我嘗試不了,我無法在那獲取信息我錯了,請解決我的問題
我的bean.java
package com.javabean;
import java.io.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.sql.ResultSet;
public class bean
{
private String msgid;
private String message;
private Connection connection=null;
private ResultSet rs = null;
private Statement st = null;
String connectionURL = "jdbc:mysql://localhost:3306/JspBean";
public bean()
{
try {
// Load the database driver
Class.forName("com.mysql.jdbc.Driver");
// Get a Connection to the database
connection = DriverManager.getConnection(connectionURL, "root", "");
}catch(Exception e){
System.out.println("Exception is ;"+e);
}
}
public void setmsgid(String msgid)
{
this.msgid = msgid;
}
public String getmsgid()
{
return (this.msgid);
}
public void setmessage(String message)
{
this.message = message;
}
public String getmessage()
{
return (this.message);
}
public void insert()
{
try
{
String sql = "insert into login(messageid,message) values('"+msgid+"','"+message+"')";
Statement s = connection.createStatement();
s.executeUpdate (sql);
s.close ();
}catch(Exception e){
System.out.println("Exception is ;"+e);
}
}
}
這是我的jspbean.jsp文件
<%@ page language="Java" import="java.sql.*" %>
<html>
<head><title>JSP with Javabeans</title></head>
<body bgcolor="#ffccff">
<h1>JSP using JavaBeans example</h1>
<form name="form1" method="POST">
ID
<input type="text" name ="msgid"> <br>
Message<input type="text" name ="message"> <br>
<br>
<input type = "submit" value="Submit">
<jsp:useBean id="sample" class="com.javabean.bean" scope="page">
<jsp:setProperty name="sample" property="*"/>
</jsp:useBean>
</form>
<% sample.insert();%>
</body>
</html>
我怎樣才能做到這一點,請提前解決我的問題
您犯了一些錯誤:
public void setmsgid(String msgid)
{
this.msgid = msgid;
}
public String getmsgid()
{
return (this.msgid);
}
您應該更改為:
public String getmsgid()
{
return msgid;
}
public void setmsgid(String msgid)
{
this.msgid = msgid;
}
並添加以下內容:
public String toString()
{
return "User[msgid="+msgid+",message="+message+"];
}
您必須更改以下一項:
insert into login(username,password) values('"+msgid+"','"+message+"')";
insert into login(username,password) values(?,?)";
更新:
insert into login(messageid,message) values(?,?)";
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