第四篇——JDBC操作数据库之修改数据
2018-03-11 22:42
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使用JDBC修改数据库中的数据，其操作方法是和添加数据差不多的，只不过在修改数据的时候还要用到UPDATE语句来实现的，例如：把图书信息id为1的图书数量改为100，其sql语句是：update book set bookCount=100 where id=1。在实际开发过程中，通常会由程序传递SQL语句中的参数，所以修改数据也通常使用PreparedStatement对象进行操作。
步骤说明：
1、代码请参考——第三篇JDBC数据库之添加数据。
2、在第三篇基础上继续实现功能——第四篇JDBC操作数据库之修改数据。
一、bookList.jsp
1.添加<td><a href="<%=request.getContextPath()%>/bookUpdate?id=${bookitem.id}">修改</a></td><%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page import="com.entity.*" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>图书列表</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<link rel="stylesheet" type="text/css" href="css/bookList.css">
</head>
<body>
<form action="" method="post">
<table width="80%" align="center">
<div class="list">图书列表</div>
<ul>
<li><a href="bookAdd.jsp">新增图书</a> </li>
<li>xxx</li>
<li>xxx</li>
<li>xxx</li>
</ul>
<tr>
<td>图书编号</td>
<td>图书名称</td>
<td>图书价格</td>
<td>图书数量</td>
<td>图书作者</td>
<td>图书修改</td>
<td>图书删除</td>
</tr>
<c:forEach var="bookitem" items="${booklist}">
<tr>
<td>${bookitem.id}</td>
<td>${bookitem.name}</td>
<td>${bookitem.price}</td>
<td>${bookitem.bookCount}</td>
<td>${bookitem.author}</td>
<td><a href="<%=request.getContextPath()%>/BookUpdate?id=${bookitem.id}">修改</a></td>
<td>xx<
4000
;/td>
</tr>
</c:forEach>
</table>
</form>
</body>
</html>
二、BookUpdate.java
1.根据input标签name属性获取值
2.调用模型----调用查询方法-->根据Id/**
* Created by Ray on 2018/3/11 0011.
**/
public class BookUpdate extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//根据input name获取值
int id = Integer.parseInt(request.getParameter("id"));
//调用模型
BookModel BookModel = new BookModel();
//调用查询方法(根据id),返回booklist集合
List booklist = BookModel.listId(id);
//不同页面间传递,传递一次后,request失去作用
request.setAttribute("booklist",booklist);
//request请求,不会改变路径
request.getRequestDispatcher("/bookUpdate.jsp").forward(request,response);
}
}
三、bookUpdate.jsp
1.添加<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
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>修改图书信息</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>
<body>
<form action="<%=request.getContextPath()%>/BookDoUpdate" method="post">
<table align="center">
<div align="center" style="font-size: 36px;font-weight: bold">修改列表</div>
<c:forEach var="bookitem" items="${booklist}">
<tr>
<td>图书编号:</td>
<td><input type="text" name="id" value="${bookitem.id}"></td>
</tr>
<tr>
<td>图书名称:</td>
<td><input type="text" name="name" value="${bookitem.name}"></td>
</tr>
<tr>
<td>图书价格:</td>
<td><input type="text" name="price" value="${bookitem.price}"></td>
</tr>
<tr>
<td>图书数量:</td>
<td><input type="text" name="bookCount" value="${bookitem.bookCount}"></td>
</tr>
<tr>
<td>图书作者:</td>
<td><input type="text" name="author" value="${bookitem.author}"></td>
</tr>
</c:forEach>
<tr>
<td><input type="submit" value="修改"></td>
<td><input type="reset" value="重置"></td>
</tr>
</table>
</form>
</body>
</html>
四、BookDoUpdate.java
1.根据input标签name属性获取值
2.调用模型----调用更新方法package com.control;
import com.model.BookModel;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* Created by Ray on 2018/3/11 0011.
**/
public class BookDoUpdate extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//根据input name获取值
int id = Integer.parseInt(request.getParameter("id"));
String name = request.getParameter("name");
double price = Double.parseDouble(request.getParameter("price"));
int bookCount = Integer.parseInt(request.getParameter("bookCount"));
String author = request.getParameter("author");
//调用模型
BookModel BookModel = new BookModel();
//调用更新方法
BookModel.updateBook(id,name,price,bookCount,author);
//response重定向改变路径
response.sendRedirect(request.getContextPath() + "/BookList");
}
}
五、BookModel.java
1.根据id获取信息listId(int id)
2.修改图书信息updateBook(int id,String name,double price,int bookCount,String author)package com.model;
import com.dbutil.Dbconn;
import com.entity.Book;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Ray on 2018/3/11 0011.
**/
public class BookModel {
Dbconn Dbconn = new Dbconn();
Connection conn = null;
PreparedStatement ps;
ResultSet rs;
/**
* @Author: Ray
* @Date: 2018/3/11 0011
* @Description: 查询所有图书信息
* @Return: booklist
*/
public List<Book> bookList(){
//创建booklist集合
List booklist = new ArrayList();
Book Book = null;
try{
//创建Connection连接
conn = Dbconn.getConnection();
//查询所有图书信息的sql语句
String sql = "select * from booktable";
//获取PreparedStatement
ps = conn.prepareStatement(sql);
//执行查询
rs = ps.executeQuery();
//判断光标向后移动,并判断是否有效
while (rs.next()){
//实例化Book对象
Book = new Book();
//对id属性赋值
Book.setId(rs.getInt("id"));
//对name属性赋值
Book.setName(rs.getString("name"));
//对price属性赋值
Book.setPrice(rs.getDouble("price"));
//对bookCount属性赋值
Book.setBookCount(rs.getInt("bookCount"));
//对author属性赋值
Book.setAuthor(rs.getString("author"));
//将book对象添加到集合中
booklist.add(Book);
}
//关闭连接
Dbconn.closeConnection(conn,ps,rs);
}catch (Exception e){
e.printStackTrace();
}
//返回booklist集合
return booklist;
}
/**
* @Author: Ray
* @Date: 2018/3/11 0011
* @Description: 新增图书信息
* @Return:
*/
public void addBook(int id,String name,double price,int bookCount,String author){
try{
//创建Connection连接
conn = Dbconn.getConnection();
//添加图书信息的sql语句
String sql = "insert into booktable(id,name,price,bookCount,author) values(?,?,?,?,?)";
//获取PrepareStatement
ps = conn.prepareStatement(sql);
//对占位符进行赋值
ps.setInt(1,id);
ps.setString(2,name);
ps.setDouble(3,price);
ps.setInt(4,bookCount);
ps.setString(5,author);
//执行更新,返回更新锁影响的行数
int row = ps.executeUpdate();
if(row > 0){
System.out.println("添加数据成功");
}
ps.close();
conn.close();
}catch (Exception e){
System.out.println("添加数据失败");
e.printStackTrace();
}
}
/**
* @Author: Ray
* @Date: 2018/3/11 0011
* @Description: 根据Id查询图书信息
* @Return: booklist集合
*/
public List<Book> listId(int id){
//创建booklist集合
List booklist = new ArrayList();
Book Book = null;
try{
//创建Connection 连接
conn = Dbconn.getConnection();
//根据id查询图书信息的sql语句
String sql = "select * from booktable where id = ?";
//创建PreparedStatement
ps = conn.prepareStatement(sql);
//对占位符进行赋值
ps.setInt(1,id);
//执行查询
rs = ps.executeQuery();
//判断光标向后移动,并判断是否有效
while(rs.next()){
Book = new Book();
Book.setId(rs.getInt("id"));
Book.setName(rs.getString("name"));
Book.setPrice(rs.getDouble("price"));
Book.setBookCount(rs.getInt("bookCount"));
Book.setAuthor(rs.getString("author"));
booklist.add(Book);
}
}catch (Exception e){
e.printStackTrace();
}
return booklist;
}
/**
* @Author: Ray
* @Date: 2018/3/11 0011
* @Description: 修改图书信息
* @Return:
*/
public void updateBook(int id,String name,double price,int bookCount,String author){
try{
//创建Connection连接
conn = Dbconn.getConnection();
//更新图书信息的sql语句
String sql = "update booktable set name=?,price=?,bookCount=?,author=? where id=?";
//获取PreparedStatement
ps = conn.prepareStatement(sql);
//对占位符进行赋值
ps.setString(1,name);
ps.setDouble(2,price);
ps.setInt(3,bookCount);
ps.setString(4,author);
ps.setInt(5,id);
//执行更新
int row = ps.executeUpdate();
//判断是否有效
if(row > 0){
System.out.println("修改数据成功");
}
//关闭连接
ps.close();
conn.close();
}catch (Exception e){
e.printStackTrace();
}
}
}
六、web.xml
这个很关键,不能出错,否则访问会出现404错误<?xml version="1.0" encoding="UTF-8"?>
<web-app>
<servlet>
<servlet-name>BookList</servlet-name>
<servlet-class>com.control.BookList</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>BookList</servlet-name>
<url-pattern>/BookList</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>BookAdd</servlet-name>
<servlet-class>com.control.BookAdd</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>BookAdd</servlet-name>
<url-pattern>/BookAdd</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>BookUpdate</servlet-name>
<servlet-class>com.control.BookUpdate</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>BookUpdate</servlet-name>
<url-pattern>/BookUpdate</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>BookDoUpdate</servlet-name>
<servlet-class>com.control.BookDoUpdate</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>BookDoUpdate</servlet-name>
<url-pattern>/BookDoUpdate</url-pattern>
</servlet-mapping>
</web-app>
七、页面效果
ok！
步骤说明：
1、代码请参考——第三篇JDBC数据库之添加数据。
2、在第三篇基础上继续实现功能——第四篇JDBC操作数据库之修改数据。
一、bookList.jsp
1.添加<td><a href="<%=request.getContextPath()%>/bookUpdate?id=${bookitem.id}">修改</a></td><%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page import="com.entity.*" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>图书列表</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<link rel="stylesheet" type="text/css" href="css/bookList.css">
</head>
<body>
<form action="" method="post">
<table width="80%" align="center">
<div class="list">图书列表</div>
<ul>
<li><a href="bookAdd.jsp">新增图书</a> </li>
<li>xxx</li>
<li>xxx</li>
<li>xxx</li>
</ul>
<tr>
<td>图书编号</td>
<td>图书名称</td>
<td>图书价格</td>
<td>图书数量</td>
<td>图书作者</td>
<td>图书修改</td>
<td>图书删除</td>
</tr>
<c:forEach var="bookitem" items="${booklist}">
<tr>
<td>${bookitem.id}</td>
<td>${bookitem.name}</td>
<td>${bookitem.price}</td>
<td>${bookitem.bookCount}</td>
<td>${bookitem.author}</td>
<td><a href="<%=request.getContextPath()%>/BookUpdate?id=${bookitem.id}">修改</a></td>
<td>xx<
4000
;/td>
</tr>
</c:forEach>
</table>
</form>
</body>
</html>
二、BookUpdate.java
1.根据input标签name属性获取值
2.调用模型----调用查询方法-->根据Id/**
* Created by Ray on 2018/3/11 0011.
**/
public class BookUpdate extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//根据input name获取值
int id = Integer.parseInt(request.getParameter("id"));
//调用模型
BookModel BookModel = new BookModel();
//调用查询方法(根据id),返回booklist集合
List booklist = BookModel.listId(id);
//不同页面间传递,传递一次后,request失去作用
request.setAttribute("booklist",booklist);
//request请求,不会改变路径
request.getRequestDispatcher("/bookUpdate.jsp").forward(request,response);
}
}
三、bookUpdate.jsp
1.添加<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
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>修改图书信息</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>
<body>
<form action="<%=request.getContextPath()%>/BookDoUpdate" method="post">
<table align="center">
<div align="center" style="font-size: 36px;font-weight: bold">修改列表</div>
<c:forEach var="bookitem" items="${booklist}">
<tr>
<td>图书编号:</td>
<td><input type="text" name="id" value="${bookitem.id}"></td>
</tr>
<tr>
<td>图书名称:</td>
<td><input type="text" name="name" value="${bookitem.name}"></td>
</tr>
<tr>
<td>图书价格:</td>
<td><input type="text" name="price" value="${bookitem.price}"></td>
</tr>
<tr>
<td>图书数量:</td>
<td><input type="text" name="bookCount" value="${bookitem.bookCount}"></td>
</tr>
<tr>
<td>图书作者:</td>
<td><input type="text" name="author" value="${bookitem.author}"></td>
</tr>
</c:forEach>
<tr>
<td><input type="submit" value="修改"></td>
<td><input type="reset" value="重置"></td>
</tr>
</table>
</form>
</body>
</html>
四、BookDoUpdate.java
1.根据input标签name属性获取值
2.调用模型----调用更新方法package com.control;
import com.model.BookModel;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* Created by Ray on 2018/3/11 0011.
**/
public class BookDoUpdate extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//根据input name获取值
int id = Integer.parseInt(request.getParameter("id"));
String name = request.getParameter("name");
double price = Double.parseDouble(request.getParameter("price"));
int bookCount = Integer.parseInt(request.getParameter("bookCount"));
String author = request.getParameter("author");
//调用模型
BookModel BookModel = new BookModel();
//调用更新方法
BookModel.updateBook(id,name,price,bookCount,author);
//response重定向改变路径
response.sendRedirect(request.getContextPath() + "/BookList");
}
}
五、BookModel.java
1.根据id获取信息listId(int id)
2.修改图书信息updateBook(int id,String name,double price,int bookCount,String author)package com.model;
import com.dbutil.Dbconn;
import com.entity.Book;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Ray on 2018/3/11 0011.
**/
public class BookModel {
Dbconn Dbconn = new Dbconn();
Connection conn = null;
PreparedStatement ps;
ResultSet rs;
/**
* @Author: Ray
* @Date: 2018/3/11 0011
* @Description: 查询所有图书信息
* @Return: booklist
*/
public List<Book> bookList(){
//创建booklist集合
List booklist = new ArrayList();
Book Book = null;
try{
//创建Connection连接
conn = Dbconn.getConnection();
//查询所有图书信息的sql语句
String sql = "select * from booktable";
//获取PreparedStatement
ps = conn.prepareStatement(sql);
//执行查询
rs = ps.executeQuery();
//判断光标向后移动,并判断是否有效
while (rs.next()){
//实例化Book对象
Book = new Book();
//对id属性赋值
Book.setId(rs.getInt("id"));
//对name属性赋值
Book.setName(rs.getString("name"));
//对price属性赋值
Book.setPrice(rs.getDouble("price"));
//对bookCount属性赋值
Book.setBookCount(rs.getInt("bookCount"));
//对author属性赋值
Book.setAuthor(rs.getString("author"));
//将book对象添加到集合中
booklist.add(Book);
}
//关闭连接
Dbconn.closeConnection(conn,ps,rs);
}catch (Exception e){
e.printStackTrace();
}
//返回booklist集合
return booklist;
}
/**
* @Author: Ray
* @Date: 2018/3/11 0011
* @Description: 新增图书信息
* @Return:
*/
public void addBook(int id,String name,double price,int bookCount,String author){
try{
//创建Connection连接
conn = Dbconn.getConnection();
//添加图书信息的sql语句
String sql = "insert into booktable(id,name,price,bookCount,author) values(?,?,?,?,?)";
//获取PrepareStatement
ps = conn.prepareStatement(sql);
//对占位符进行赋值
ps.setInt(1,id);
ps.setString(2,name);
ps.setDouble(3,price);
ps.setInt(4,bookCount);
ps.setString(5,author);
//执行更新,返回更新锁影响的行数
int row = ps.executeUpdate();
if(row > 0){
System.out.println("添加数据成功");
}
ps.close();
conn.close();
}catch (Exception e){
System.out.println("添加数据失败");
e.printStackTrace();
}
}
/**
* @Author: Ray
* @Date: 2018/3/11 0011
* @Description: 根据Id查询图书信息
* @Return: booklist集合
*/
public List<Book> listId(int id){
//创建booklist集合
List booklist = new ArrayList();
Book Book = null;
try{
//创建Connection 连接
conn = Dbconn.getConnection();
//根据id查询图书信息的sql语句
String sql = "select * from booktable where id = ?";
//创建PreparedStatement
ps = conn.prepareStatement(sql);
//对占位符进行赋值
ps.setInt(1,id);
//执行查询
rs = ps.executeQuery();
//判断光标向后移动,并判断是否有效
while(rs.next()){
Book = new Book();
Book.setId(rs.getInt("id"));
Book.setName(rs.getString("name"));
Book.setPrice(rs.getDouble("price"));
Book.setBookCount(rs.getInt("bookCount"));
Book.setAuthor(rs.getString("author"));
booklist.add(Book);
}
}catch (Exception e){
e.printStackTrace();
}
return booklist;
}
/**
* @Author: Ray
* @Date: 2018/3/11 0011
* @Description: 修改图书信息
* @Return:
*/
public void updateBook(int id,String name,double price,int bookCount,String author){
try{
//创建Connection连接
conn = Dbconn.getConnection();
//更新图书信息的sql语句
String sql = "update booktable set name=?,price=?,bookCount=?,author=? where id=?";
//获取PreparedStatement
ps = conn.prepareStatement(sql);
//对占位符进行赋值
ps.setString(1,name);
ps.setDouble(2,price);
ps.setInt(3,bookCount);
ps.setString(4,author);
ps.setInt(5,id);
//执行更新
int row = ps.executeUpdate();
//判断是否有效
if(row > 0){
System.out.println("修改数据成功");
}
//关闭连接
ps.close();
conn.close();
}catch (Exception e){
e.printStackTrace();
}
}
}
六、web.xml
这个很关键,不能出错,否则访问会出现404错误<?xml version="1.0" encoding="UTF-8"?>
<web-app>
<servlet>
<servlet-name>BookList</servlet-name>
<servlet-class>com.control.BookList</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>BookList</servlet-name>
<url-pattern>/BookList</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>BookAdd</servlet-name>
<servlet-class>com.control.BookAdd</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>BookAdd</servlet-name>
<url-pattern>/BookAdd</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>BookUpdate</servlet-name>
<servlet-class>com.control.BookUpdate</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>BookUpdate</servlet-name>
<url-pattern>/BookUpdate</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>BookDoUpdate</servlet-name>
<servlet-class>com.control.BookDoUpdate</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>BookDoUpdate</servlet-name>
<url-pattern>/BookDoUpdate</url-pattern>
</servlet-mapping>
</web-app>
七、页面效果
ok！
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