那麼book表一分為n，多個子表更新數據的時候會聯動book表更新數據。然後順勢寫了個增加圖書的方法。內容不多，錯誤不少、 ...
目錄
大項目之網上書城（八）——資料庫大改&添加圖書
主要改動
今天也是各種各種各種出錯的一天啊，經歷了各種方法的重寫，各種觸發器的重寫。
那麼book表一分為n，多個子表更新數據的時候會聯動book表更新數據。然後順勢寫了個增加圖書的方法。內容不多，錯誤不少、
1.資料庫新增表
代碼
以clothing為例，為各個類都新增了一個表。
DROP TABLE IF EXISTS `clothing`;
CREATE TABLE `clothing` (
`book_name` varchar(40) NOT NULL,
`price` double NOT NULL,
`describtion` varchar(200) DEFAULT NULL,
`clazz` varchar(40) NOT NULL,
`second_id` int(11) NOT NULL AUTO_INCREMENT,
`book_img` blob,
`click_num` int(11) NOT NULL,
`buy_num` int(9) NOT NULL,
`re_du` int(12) DEFAULT NULL,
`count` int(6) NOT NULL,
`is_new` int(1) NOT NULL,
`insert_date` date NOT NULL,
`book_id` int(11) DEFAULT NULL,
PRIMARY KEY (`second_id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;2.資料庫新增觸發器
還是以clothing表為例，兩個方法，一個是當子表插入數據時，book表插入一條同樣的數據，2是子表更新時，book也做出相應更新。
DROP TRIGGER IF EXISTS `c_insert`;
DELIMITER ;;
CREATE TRIGGER `c_insert` AFTER INSERT ON `clothing` FOR EACH ROW begin
insert into book(book_name,price,describtion,clazz,second_id,click_num,buy_num,count,is_new,insert_date) values(NEW.book_name,NEW.price,NEW.describtion,NEW.clazz,NEW.second_id,0,0,NEW.count,1,NEW.insert_date);
end
;;
DELIMITER ;
DROP TRIGGER IF EXISTS `c_update`;
DELIMITER ;;
CREATE TRIGGER `c_update` AFTER UPDATE ON `clothing` FOR EACH ROW begin
update book set book.re_du = NEW.click_num + NEW.buy_num * 100,book.click_num = NEW.click_num,book.buy_num = NEW.buy_num where clazz = new.clazz and second_id = new.second_id;
end
;;
DELIMITER ;3.其他對BookService和BookDao的修改
代碼
因為改得代碼太多，太亂了，不好發，於是重新都發一下實現類好了。
daoimpl
package cn.edu.bdu.mc.daos.impls;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Date;
import java.util.List;
import javax.sql.DataSource;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import cn.edu.bdu.mc.beans.Book;
import cn.edu.bdu.mc.daos.BookDao;
import cn.edu.bdu.mc.utils.JDBCUtil;
public class BookDaoImpl implements BookDao {
private DataSource dataSource = JDBCUtil.getDataSource();
private QueryRunner queryRunner = new QueryRunner(dataSource);
@Override
public Book findNewBookByPaiMing(int shu) throws SQLException {
// TODO Auto-generated method stub
String sql = "select * from (select * from book where is_new = 1 order by re_du desc)as book1 limit "+(shu-1)+",1";
return queryRunner.query(sql, new BeanHandler<Book>(Book.class));
}
@Override
public List<Book> findBookReMen(int page) throws SQLException {
String sql = "select * from (select * from book order by re_du desc)as book1 limit "+(page-1)*2+",2";
return queryRunner.query(sql, new BeanListHandler<Book>(Book.class));
}
@Override
public void insert(Book book) throws SQLException {
// TODO Auto-generated method stub
String sql = "insert into "+book.getClazz()+"(book_name,price,describtion,clazz,click_num,buy_num,count,is_new,insert_date) values(?,?,?,?,0,0,?,1,?)";
queryRunner.update(sql,book.getBook_name(),book.getPrice(),book.getDescribtion(),book.getClazz(),book.getCount(),new Date());
}
@Override
public Book findBookById(int book_id) throws SQLException{
String sql = "select * from book where book_id = ?";
return queryRunner.query(sql, new BeanHandler<Book>(Book.class),book_id);
}
@Override
public List<Book>findAllBook() throws SQLException {
String sql = "select * from book";
return queryRunner.query(sql, new BeanListHandler<Book>(Book.class));
}
@Override
public void deleteById(int book_id) throws SQLException {
String sql = "delete from book where book_id = ?";
queryRunner.update(sql,book_id);
}
@Override
public void update(Book book) throws SQLException {
String sql = "update book set book_name = ?, price = ?, describtion = ?, clazz = ?, second_id = ?, click_num = ?, buy_num = ?, count = ?, is_new = ? where book_id = ?";
queryRunner.update(sql,book.getBook_name(),book.getPrice(),book.getDescribtion(),book.getClazz(),book.getSecond_id(),book.getClick_num(),book.getBuy_num(),book.getCount(),book.getIs_new(),book.getBook_id());
}
@Override
public void addImgByName(String book_name, String path) throws SQLException, IOException {
// TODO Auto-generated method stub
Connection conn = null;
PreparedStatement ps = null;
FileInputStream in = null;
in = new FileInputStream(new File(path));
conn = JDBCUtil.getConn();
String sql = "update book set book_img = ? where book_name = ?";
ps = conn.prepareStatement(sql);
ps.setBinaryStream(1, in, in.available());
ps.setString(2, book_name);
int count = ps.executeUpdate();
if (count > 0) {
System.out.println("插入成功！");
} else {
System.out.println("插入失敗！");
}
JDBCUtil.release(conn, ps);
}
@Override
public InputStream getImgById(int book_id) throws SQLException {
// TODO Auto-generated method stub
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
InputStream in = null;
try {
conn = JDBCUtil.getConn();
String sql = "select book_img from book where book_id = ?";
ps = conn.prepareStatement(sql);
ps.setInt(1, book_id);
rs = ps.executeQuery();
while (rs.next()) {
in = rs.getBinaryStream("book_img");
}
} catch (Exception e) {
e.printStackTrace();
}
JDBCUtil.release(conn, ps, rs);
return in;
}
@Override
public Book findBookByClazzAndEr_id(String clazz, int er_id) throws SQLException {
// TODO Auto-generated method stub
String sql = "select * from "+clazz+" where second_id = ?";
Book book = queryRunner.query(sql, new BeanHandler<Book>(Book.class),er_id);
if(book.getBook_id()==0) {
sql = "select * from book where clazz = ? and second_id = ?";
book.setBook_id(queryRunner.query(sql,new BeanHandler<Book>(Book.class),clazz,er_id).getBook_id());
sql = "update "+clazz+" set book_id = ?";
queryRunner.update(sql,book.getBook_id());
}
return book;
}
@Override
public void updateClazz(Book book) throws SQLException {
// TODO Auto-generated method stub
String sql = "update "+book.getClazz()+" set book_name = ?, price = ?, describtion = ?, clazz = ?, book_id = ?, click_num = ?, buy_num = ?, count = ?, is_new = ? where second_id = ?";
queryRunner.update(sql,book.getBook_name(),book.getPrice(),book.getDescribtion(),book.getClazz(),book.getBook_id(),book.getClick_num(),book.getBuy_num(),book.getCount(),book.getIs_new(),book.getSecond_id());
}
}
serviceimpl
package cn.edu.bdu.mc.services.impls;
import java.io.IOException;
import java.io.InputStream;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import javax.sql.DataSource;
import cn.edu.bdu.mc.beans.Book;
import cn.edu.bdu.mc.daos.BookDao;
import cn.edu.bdu.mc.daos.impls.BookDaoImpl;
import cn.edu.bdu.mc.services.BookService;
import cn.edu.bdu.mc.utils.JDBCUtil;
public class BookServiceImpl implements BookService {
private DataSource dataSource = JDBCUtil.getDataSource();
private BookDao dao = new BookDaoImpl();
@Override
public Book findNewBookByPaiMing(int shu) throws SQLException {
// TODO Auto-generated method stub
return dao.findNewBookByPaiMing(shu);
}
@Override
public void click(int book_id) throws SQLException {
// TODO Auto-generated method stub
Book book = dao.findBookById(book_id);
book.setClick_num(book.getClick_num()+1);
dao.update(book);
dao.updateClazz(book);
}
@Override
public void buy(int book_id) throws SQLException {
// TODO Auto-generated method stub
Book book = dao.findBookById(book_id);
book.setBuy_num(book.getBuy_num()+1);
dao.update(book);
}
@Override
public List<Book> findBookReMen(int page) throws SQLException {
return dao.findBookReMen(page);
}
@Override
public void addImgByName(String book_name, String path) throws SQLException, IOException {
// TODO Auto-generated method stub
dao.addImgByName(book_name, path);
}
@Override
public InputStream getImgById(int book_id) throws SQLException {
// TODO Auto-generated method stub
return dao.getImgById(book_id);
}
@Override
public Book findBookByClazzAndEr_id(String clazz, int er_id) throws SQLException {
// TODO Auto-generated method stub
return dao.findBookByClazzAndEr_id(clazz, er_id);
}
@Override
public List<Book> findBookByClazz(String clazz) throws SQLException {
List<Book> list = dao.findAllBook();
List<Book> newList = new ArrayList<>();
//lambda表達式，emmmm，的確可讀性不太好的樣子。
list.forEach(book->{if(book.getClazz().equals(clazz)){newList.add(book);}});
/*
相當於
for (Book book : newList) {
if(book.getClazz().equals(clazz)){
newList.add(book);
}
}
*/
return newList;
}
@Override
public void insert(String book_name, double price, String describtion, String clazz, int count)
throws SQLException {
// TODO Auto-generated method stub
Book book = new Book(book_name,price,describtion,clazz,count);
dao.insert(book);
}
}
4.addBook.jsp
代碼
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<title>添加圖書</title>
</head>
<body style="background-color:#bbb;width:1400px;margin:0 auto">
<!-- 調用頭部頁面 -->
<div style="width:100%;height:100px;float:left">
<jsp:include page="/admin/head.jsp"></jsp:include>
</div>
<!-- 通用內容體大小 -->
<div style="width:70%;height:600px;float:left;margin-left:15%;">
<!-- 好看的圖 -->
<div style="width:55%;height:100%;float:left;margin-top:10%;">
<img alt="拿書男孩" src="${pageContext.request.contextPath }/client/img/admin.jpg" style="width:90%;">
</div>
<!-- 登錄界面 -->
<div style="width:45%;height:80%;float:left;margin-top:7%">
<form action="${pageContext.request.contextPath }/AddNewBook" method="post"
enctype="multipart/form-data" class="form-horizontal" role="form">
<div class="form-group">
<label for="lastname" class="col-sm-3 control-label input-lg">書名</label>
<div class="col-sm-9">
<input type="text" name="book_name" class="form-control input-lg"
placeholder="請輸入書名" style="float:left"/>
</div>
</div>
<div class="form-group">
<label for="lastname" class="col-sm-3 control-label input-lg">價格</label>
<div class="col-sm-9">
<input type="text" name="price" class="form-control input-lg"
placeholder="請輸入價格" style="float:left"/>
</div>
</div>
<div class="form-group">
<label for="lastname" class="col-sm-3 control-label input-lg">描述</label>
<div class="col-sm-9">
<textarea class="form-control input-lg" name="describtion" rows="2"
placeholder="請輸入描述" style="float:left"></textarea>
</div>
</div>
<div class="form-group">
<label for="lastname" class="col-sm-3 control-label input-lg">類別</label>
<div class="col-sm-9">
<select name="clazz" class="form-control input-lg" style="float:left">
<option value="clothing">服裝</option>
<option value="food">食品</option>
<option value="net_literature">網路文學</option>
<option value="nursery">育嬰童</option>
<option value="pai">好書拍賣</option>
<option value="residence">家居</option>
<option value="sport">運動戶外</option>
</select>
</div>
</div>
<div class="form-group">
<label for="lastname" class="col-sm-3 control-label input-lg">數量</label>
<div class="col-sm-9">
<input type="text" name="count" class="form-control input-lg"
placeholder="請輸入數量" style="float:left"/>
</div>
</div>
<div class="form-group">
<label for="exampleInputFile" class="col-sm-3 control-label input-lg" style="float:left;">圖片</label>
<div class="col-sm-9">
<input type="file" name="img" class="form-control input-lg" style="float:left">
</div>
</div>
<div class="form-group">
<label for="firstname" class="col-sm-1 control-label input-lg"></label>
<div class="col-sm-5">
<input type="submit" name="submit" value="提交"
class="form-control input-lg btn btn-primary"style="width:100%;float:left"/>
</div>
<div class="col-sm-5">
<input type="reset" name="reset" value="重置" id="re"
class="form-control input-lg btn btn-warning"style="width:100%;float:left"/>
</div>
</div>
</form>
</div>
</div>
<!-- 調用底部頁面 -->
<div style="width:100%;height:60px;float:left">
<jsp:include page="/admin/foot.jsp"></jsp:include>
</div>
</body>
</html>
效果圖
5.AddNewBookServlet
代碼
package cn.edu.bdu.mc.servlets;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.util.List;
import java.util.UUID;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import cn.edu.bdu.mc.services.BookService;
import cn.edu.bdu.mc.services.impls.BookServiceImpl;
/**
* Servlet implementation class AddNewBookServlet
*/
@WebServlet("/AddNewBook")
public class AddNewBookServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public AddNewBookServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
BookService bookService = new BookServiceImpl();
// String book_name = request.getParameter("book_name");
// String price = request.getParameter("price");
// String describtion = request.getParameter("describtion");
// String clazz = request.getParameter("clazz");
// String count = request.getParameter("count");
// //測試成功
// response.getWriter().write(book_name+"<br>"+price+"<br>"+describtion+"<br>"+clazz+"<br>"+count);
//把enctype="multipart/form-data"之後好像不能用普通方法獲取了。。
DiskFileItemFactory factory = new DiskFileItemFactory();
File file = new File("d:\\Target");
if(!file.exists()) {
file.mkdirs();
}
factory.setRepository(file);
ServletFileUpload fileUpload = new ServletFileUpload(factory);
fileUpload.setHeaderEncoding("utf-8");
try {
List<FileItem> fileItems = fileUpload.parseRequest(request);
String value = null;
String book_name = fileItems.get(0).getString("utf-8");
Double price = Double.parseDouble(fileItems.get(1).getString("utf-8"));
String describtion = fileItems.get(2).getString("utf-8");
String clazz = fileItems.get(3).getString("utf-8");
int count = Integer.parseInt(fileItems.get(4).getString("utf-8"));
for (FileItem fileItem : fileItems) {
if(!fileItem.isFormField()) {
String filename = fileItem.getName();
filename = filename.substring(filename.lastIndexOf("\\")+1);
filename = UUID.randomUUID().toString()+"_"+value+"_"+filename;
String webPath = "/upload/";
String filepath = getServletContext().getRealPath(webPath+filename);
File file2 = new File(filepath);
File file3 = new File("d:\\upload\\"+filename);
file3.getParentFile().mkdirs();
file3.createNewFile();
file2.getParentFile().mkdirs();
file2.createNewFile();
InputStream inputStream = fileItem.getInputStream();
OutputStream outputStream = new FileOutputStream(file2);
OutputStream outputStream2 = new FileOutputStream(file3);
byte[] buffer = new byte[2048];
int len;
while((len = inputStream.read(buffer)) > 0) {
outputStream.write(buffer, 0, len);
outputStream2.write(buffer, 0, len);
}
inputStream.close();
outputStream.close();
outputStream2.close();
fileItem.delete();
try {
bookService.insert(book_name, price, describtion, clazz, count);
String path = "d:/upload/"+filename;
bookService.addImgByName(book_name, path);
String htmlCode="<!DOCTYPE html>\n" +
"<html>"
+ "<head>"
+ "<link rel=\"stylesheet\" href=\""+request.getContextPath()+"/bootstrap-3.3.7-dist/css/bootstrap.min.css\">"
+ "</head>"
+ "<body>"
+ "<div style=\"position:absolute;left:44%;top:46%;height:100px;width:240px;background-color:rgba(145, 162, 196, 0.9);border:1px;text-align:center;\"id=\"quit1\">\r\n" +
" <h3>添加成功！</h3><a class=\"btn btn-info\" href=\""+request.getContextPath()+"/admin/addBook.jsp\">繼續添加</a> "
+"<a class=\"btn btn-info\" href=\""+request.getContextPath()+"/client/index.jsp\">去主頁</a>\n" +
"</div>"
+ "</body>"
+ "</html>";
response.getWriter().write(htmlCode);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
} catch (FileUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
