1 <h1><center>三个查询业务</center></h1> 
 2 <form action="<c:url value=‘/OrderServlet‘/>" method="post">
 3    <input type="hidden" name="method" value="findByUid">
 4      业务一： 按用户名查询该用户订单，返回所有订单对象 的集合！测试用户id为"1"<br>
 5       请输入用户名： <input type="text" name="uid" value="请输入用户id..测试数据库中只有1"/>
 6    <input type="submit" value ="查询">
 7 </form>
 8 <hr>
 9 业务二： 查询多个商品，返回多个商品对象的集合！，每个商品中显示该商品分类的名字! <br>
10 <a href="<c:url value=‘/BookServlet?method=morefindAll‘/>">点击查询</a>
11 <hr>
12 业务三： 查询一个商品，返回该商品对象！，商品中显示该商品分类的名字！ 测试查询id为1的那本天龙八部的书<br>
13 <a href="<c:url value=‘/BookServlet?method=onefindByBid&bid=1‘/>">点击查询</a>

 1  <h1><center>全部书的信息，每本书显示分类</center></h1>
 2     <table border="1">
 3     <c:forEach items="${bookList }" var="book">
 4         <tr>
 5          <td>书名 ：</td>
 6          <td>${book.bname }</td>
 7        </tr>
 8        <tr>
 9          <td>分类 ：</td>
10          <td>
11              <c:forEach items="${categoryList }" var="category">
12                 <c:if test="${category.cid eq book.category.cid }">
13                    ${category.cname }
14                 </c:if>
15              </c:forEach>
16          </td>
17        </tr> 
18     </c:forEach>        
19     </table>

 1 <h1><center>一本书的详细，显示分类名称</center></h1>
 2    <table border="1">
 3       <tr>
 4         <td>书名:</td>
 5         <td>${book.bname }</td>
 6       </tr>
 7       <tr>
 8         <td>分类:</td>
 9         <td>
10 <%-- 遍历所有分类，商品中的分类属性中的id是否 和 分类中的id一样  。     --%>
11             <c:forEach items="${categoryList }" var="category">
12                <c:if test="${category.cid eq book.category.cid }">
13                   ${category.cname }
14                </c:if>
15             </c:forEach>
16         </td>
17       </tr>
18    </table>

 1 <h1><center>显示该用户订单，包括订单中的所有条目</center></h1>
 2     <table border="1">
 3     <c:forEach items="${orderList }" var="order">
 4         <tr>
 5          <td>订单编号 ：</td>
 6          <td>${order.oid}</td>
 7        </tr>
 8        <tr>
 9          <td>合计 ：</td>
10          <td>${order.totalPrice }</td>
11        </tr> 
12        <tr>
13          <td>订单中的物品 ：</td>
14          <td>
15          <%-- 遍历该订单所有的订单条目--%>
16            <c:forEach items="${order.orderItemList }" var="orderItem">
17                <%--遍历所有的商品，对比是否该订单条目中有哪个商品 --%>
18                <c:forEach items="${bookList }" var="book">
19                    <c:if test="${orderItem.book.bid eq book.bid  }">
20                    <%--如果有这个商品，输出该商品名称--%>
21                       ${book.bname }<br>
22                    </c:if>
23                </c:forEach>                                       
24            </c:forEach>          
25          </td>
26        </tr>
27     </c:forEach>        
28     </table>

package cn.kmust.bookstore.dao;

import java.sql.SQLException;
import java.util.List;
import java.util.Map;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.MapHandler;
import org.apache.commons.dbutils.handlers.MapListHandler;

import cn.itcast.commons.CommonUtils;
import cn.itcast.jdbc.TxQueryRunner;
import cn.kmust.bookstore.domain.Book;
import cn.kmust.bookstore.domain.Category;
import cn.kmust.bookstore.utils.ToBookUtils;
/**
 * 商品 持久层
 * @author ZHAOYUQIANG
 *
 */
public class BookDao {
    private QueryRunner qr = new TxQueryRunner();
    private ToBookUtils tbUtil = new ToBookUtils();
    /**
     * 查询一本书
     * @param bid
     * @return
     */
    public Book findByBid(String bid) {
        try{
            /*
             * 
             * 在Book对象中保存Category信息,即: 在书中添加所属分类
             *  要给Map映射成两个对象，再给这两个对象建立关系
             */
            String sql = "select * from tb_book where bid=?";
            Map<String,Object> map = qr.query(sql, new MapHandler(),bid);
            return tbUtil.toBook(map);
        }catch(SQLException e){
            throw new RuntimeException(e);
        }
    }
    /**
     * 查询所有图书
     * @return
     */
    public List<Book> findAll() {
        try{
            String sql = "select * from tb_book";
            List<Map<String,Object>> mapList = qr.query(sql, new MapListHandler());
            return tbUtil.toBookList(mapList);
        }catch(SQLException e){
            throw new RuntimeException(e);
        }        
    }
}

 1 package cn.kmust.bookstore.dao;
 2 
 3 import java.sql.SQLException;
 4 import java.util.List;
 5 
 6 import org.apache.commons.dbutils.QueryRunner;
 7 import org.apache.commons.dbutils.handlers.BeanListHandler;
 8 
 9 import cn.itcast.jdbc.TxQueryRunner;
10 import cn.kmust.bookstore.domain.Category;
11 /**
12  * 分类 持久层
13  * @author ZHAOYUQIANG
14  *
15  */
16 public class CategoryDao {
17     private QueryRunner qr = new TxQueryRunner();
18     /**
19      * 查询所有分类
20      * @return
21      */
22     public List<Category> findAll() {
23         try{
24             String sql = "select * from tb_category";
25             return qr.query(sql, new BeanListHandler<Category>(Category.class));
26         }catch(SQLException e ){
27             throw new RuntimeException (e);
28         }
29 
30     }
31 
32 }

 1 package cn.kmust.bookstore.dao;
 2 
 3 import java.sql.SQLException;
 4 import java.util.List;
 5 import java.util.Map;
 6 
 7 import org.apache.commons.dbutils.QueryRunner;
 8 import org.apache.commons.dbutils.handlers.BeanListHandler;
 9 import org.apache.commons.dbutils.handlers.MapListHandler;
10 
11 import cn.itcast.jdbc.TxQueryRunner;
12 import cn.kmust.bookstore.domain.Order;
13 import cn.kmust.bookstore.domain.OrderItem;
14 import cn.kmust.bookstore.utils.ToOrder;
15 /**
16  * 订单持久层
17  * @author ZHAOYUQIANG
18  *
19  */
20 public class OrderDao {
21     private QueryRunner qr = new TxQueryRunner();
22     private ToOrder toUtil = new ToOrder();
23     /**
24      * 按用户id查询所有订单
25      *   订单中需要有订单条目
26      * @param username
27      * @return
28      */
29     public List<Order> findByUid(String uid) {
30         try{
31             String sql = "select * from tb_order where uid=?" ;
32             List<Order> orderList = qr.query(sql, 
33                     new BeanListHandler<Order>(Order.class),uid);
34             /*
35              * 遍历查找出来的每个Order,为每个order加载他的所有orderItem(订单条目)
36              */
37             for(Order order : orderList){
38                 loadOrderItems(order);
39             }
40             return orderList ;
41         }catch(SQLException e){
42             throw new RuntimeException(e);
43         }        
44     }
45     /**
46      * 为指定的order对象加载它的所有条目
47      * @param order
48      */
49     private void loadOrderItems(Order order) {
50         try{
51             /*
52              * 需要查询book表和orderItem表，多表查询
53              */
54             String sql = "select * from tb_orderItem i,tb_book b where i.bid=b.bid and oid=?";
55             List<Map<String,Object>> mapList = qr.query(sql, 
56                     new MapListHandler(),order.getOid());
57             /*
58              * 建立订单条目与book的关系，得到该订单的条目 
59              */
60             List<OrderItem> orderItemList = toUtil.toOrderItemList(mapList);    
61             /*
62              * 订单加载所有条目
63              */
64             order.setOrderItemList(orderItemList);
65         }catch(SQLException e){
66             throw new RuntimeException(e);
67         }
68     }
69     
70 }

 1 package cn.kmust.bookstore.domain;
 2 /**
 3  * 商品 领域对象 属性名字与数据库字段名字一样
 4  * @author ZHAOYUQIANG
 5  *
 6  */
 7 public class Book {
 8     private String bid ;
 9     private String bname ;
10     private double price ;
11     private Category category  ; //关联cid
12     public String getBid() {
13         return bid;
14     }
15     public void setBid(String bid) {
16         this.bid = bid;
17     }
18     public String getBname() {
19         return bname;
20     }
21     public void setBname(String bname) {
22         this.bname = bname;
23     }
24     public double getPrice() {
25         return price;
26     }
27     public void setPrice(double price) {
28         this.price = price;
29     }
30     public Category getCategory() {
31         return category;
32     }
33     public void setCategory(Category category) {
34         this.category = category;
35     }
36 }

 1 package cn.kmust.bookstore.domain;
 2 /**
 3  * 分类  领域对象 属性名字与数据库字段名字一样
 4  * @author ZHAOYUQIANG
 5  *
 6  */
 7 public class Category {
 8     private String cid ;
 9     private String cname  ;
10     public String getCid() {
11         return cid;
12     }
13     public void setCid(String cid) {
14         this.cid = cid;
15     }
16     public String getCname() {
17         return cname;
18     }
19     public void setCname(String cname) {
20         this.cname = cname;
21     }
22 }

 1 package cn.kmust.bookstore.domain;
 2 
 3 import java.util.List;
 4 
 5 /**
 6  * 订单 领域对象 属性名字与数据库字段名字一样
 7  * @author ZHAOYUQIANG
 8  *
 9  */
10 public class Order {
11     private String oid ;
12     private double totalPrice ;
13     private User user ;//关联用户
14     private List<OrderItem> orderItemList ;//单独设置的关联，因为订单中需要添加所有的条目
15     
16     public List<OrderItem> getOrderItemList() {
17         return orderItemList;
18     }
19     public void setOrderItemList(List<OrderItem> orderItemList) {
20         this.orderItemList = orderItemList;
21     }
22     public String getOid() {
23         return oid;
24     }
25     public void setOid(String oid) {
26         this.oid = oid;
27     }
28     public double getTotalPrice() {
29         return totalPrice;
30     }
31     public void setTotalPrice(double totalPrice) {
32         this.totalPrice = totalPrice;
33     }
34     public User getUser() {
35         return user;
36     }
37     public void setUser(User user) {
38         this.user = user;
39     }        
40 }

 1 package cn.kmust.bookstore.domain;
 2 /**
 3  * 订单条目 领域对象 属性名字与数据库字段名字一样
 4  * @author ZHAOYUQIANG
 5  *
 6  */
 7 public class OrderItem {
 8     private String oiid ;
 9     private int count ;
10     private double subtotal ;
11     private Order order ;//关联订单
12     private Book book ; //关联商品
13     public String getOiid() {
14         return oiid;
15     }
16     public void setOiid(String oiid) {
17         this.oiid = oiid;
18     }
19     public int getCount() {
20         return count;
21     }
22     public void setCount(int count) {
23         this.count = count;
24     }
25     public double getSubtotal() {
26         return subtotal;
27     }
28     public void setSubtotal(double subtotal) {
29         this.subtotal = subtotal;
30     }
31     public Order getOrder() {
32         return order;
33     }
34     public void setOrder(Order order) {
35         this.order = order;
36     }
37     public Book getBook() {
38         return book;
39     }
40     public void setBook(Book book) {
41         this.book = book;
42     }
43 }

 1 package cn.kmust.bookstore.domain;
 2 /**
 3  * 订单 领域对象 属性名字与数据库字段名字一样
 4  * @author ZHAOYUQIANG
 5  *
 6  */
 7 public class User {
 8     private String uid ;
 9     private String uname ;
10     public String getUid() {
11         return uid;
12     }
13     public void setUid(String uid) {
14         this.uid = uid;
15     }
16     public String getUname() {
17         return uname;
18     }
19     public void setUname(String uname) {
20         this.uname = uname;
21     }
22     
23 
24 }

 1 package cn.kmust.bookstore.utils;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 import java.util.Map;
 6 
 7 import cn.itcast.commons.CommonUtils;
 8 import cn.kmust.bookstore.domain.Book;
 9 import cn.kmust.bookstore.domain.Category;
10 /**
11  * 建立商品与分类之间的关系
12  * @author ZHAOYUQIANG
13  *
14  */
15 public class ToBookUtils {
16     /**
17      * 把mapList中每个Map转换成Book对象，并且每个Book对象调用toBook方法建立与category的关系
18      * 返回集合
19      * @param mapList
20      * @return
21      */
22     public List<Book> toBookList(List<Map<String,Object>> mapList){
23         List<Book> bookList = new ArrayList<Book>();
24         for(Map<String,Object> map : mapList){
25             Book b = toBook(map);
26             bookList.add(b);
27         } 
28         return bookList ;        
29     }
30     /**
31      * 把一个map转换成两个对象(book和category)，并且建立两个对象之间的关系(把category合并在Book中)
32      * 返回一个对象
33      * @param map
34      * @return
35      */
36     public Book toBook(Map<String,Object> map){
37         Category category = CommonUtils.toBean(map, Category.class);
38         Book book = CommonUtils.toBean(map, Book.class);
39         book.setCategory(category);
40         return book ;
41     }
42 
43 }

 1 package cn.kmust.bookstore.utils;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 import java.util.Map;
 6 
 7 import cn.itcast.commons.CommonUtils;
 8 import cn.kmust.bookstore.domain.Book;
 9 import cn.kmust.bookstore.domain.OrderItem;
10 
11 /**
12  * 建立订单条目(OrderItem)和商品(Book)之间的关系
13  * @author ZHAOYUQIANG
14  *
15  */
16 public class ToOrder {
17     /**
18      * 把mapList中每个Map转换成OrderItem对象，并且每个OrderItem对象调用toOrderItem方法建立与book的关系
19      * @param mapList
20      * @return
21      */
22     public List<OrderItem> toOrderItemList(List<Map<String,Object>> mapList){
23         List<OrderItem> orderItemList = new ArrayList<OrderItem>();
24         for(Map<String,Object> map : mapList){
25             OrderItem item = toOrderItem(map);
26             orderItemList.add(item);
27         }
28         return orderItemList; 
29     }
30     /**
31      * 把一个map转换成两个对象(OrderItem和book)，并且建立两个对象之间的关系(把book合并在OrderItem中)
32      * @param map
33      * @return
34      */
35     public OrderItem toOrderItem(Map<String,Object> map){
36         OrderItem orderItem = CommonUtils.toBean(map, OrderItem.class);
37         Book book = CommonUtils.toBean(map, Book.class);
38         orderItem.setBook(book);
39         return orderItem ;
40     }
41 }

 1 package cn.kmust.bookstore.web.servlet;
 2 
 3 import java.io.IOException;
 4 import java.util.List;
 5 
 6 import javax.servlet.ServletException;
 7 import javax.servlet.http.HttpServletRequest;
 8 import javax.servlet.http.HttpServletResponse;
 9 
10 import cn.itcast.servlet.BaseServlet;
11 import cn.kmust.bookstore.domain.Book;
12 import cn.kmust.bookstore.service.BookService;
13 import cn.kmust.bookstore.service.CategoryService;
14 /**
15  * BookServlet表述层
16  * @author ZHAOYUQIANG
17  *
18  */
19 public class BookServlet extends BaseServlet {
20     private BookService bookService = new BookService();
21     private CategoryService categoryService = new CategoryService();
22     /**
23      * 查询一本图书信息
24      * @param request
25      * @param response
26      * @return
27      * @throws ServletException
28      * @throws IOException
29      */
30     public String onefindByBid(HttpServletRequest request, HttpServletResponse response)
31             throws ServletException, IOException {
32         Book book = bookService.findByBid(request.getParameter("bid"));
33         request.setAttribute("book", book);
34         request.setAttribute("categoryList", categoryService.findAll());
35         return "f:/list_onebook.jsp" ;
36     }
37     /**
38      * 查询多本图书
39      * @param request
40      * @param response
41      * @return
42      * @throws ServletException
43      * @throws IOException
44      */
45     public String morefindAll(HttpServletRequest request, HttpServletResponse response)
46             throws ServletException, IOException {
47         List<Book> bookList = bookService.findAll();
48         request.setAttribute("bookList", bookList);
49         request.setAttribute("categoryList",categoryService.findAll() );
50         return "f:/list_morebook.jsp" ;
51     }
52 
53 }

 1 package cn.kmust.bookstore.web.servlet;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.ServletException;
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 
 9 import cn.itcast.servlet.BaseServlet;
10 import cn.kmust.bookstore.service.BookService;
11 import cn.kmust.bookstore.service.OrderService;
12 /**
13  * Order表述层
14  * @author ZHAOYUQIANG
15  *
16  */
17 public class OrderServlet extends BaseServlet {
18     private OrderService orderService = new OrderService();
19     private BookService bookService = new BookService();
20     /**
21      * 按用户查询所有订单
22      * @param request
23      * @param response
24      * @return
25      * @throws ServletException
26      * @throws IOException
27      */
28     public String findByUid(HttpServletRequest request, HttpServletResponse response)
29             throws ServletException, IOException {
30         String uid = request.getParameter("uid");
31         request.setAttribute("orderList", orderService.findByUid(uid));
32         request.setAttribute("bookList", bookService.findAll());
33         return "f:/list_order.jsp" ;
34     }
35 
36 }

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <c3p0-config>
 3     <default-config>
 4         <property name="jdbcUrl">jdbc:mysql://localhost:3306/db_bookstore</property>
 5         <property name="driverClass">com.mysql.jdbc.Driver</property>
 6         <property name="user">root</property>
 7         <property name="password">123456</property>
 8         <property name="acquireIncrement">3</property>
 9         <property name="initialPoolSize">5</property>
10         <property name="minPoolSize">2</property>
11         <property name="maxPoolSize">8</property>
12     </default-config>
13 </c3p0-config>

 1 /*用户表*/
 2 CREATE TABLE tb_user(
 3    uid CHAR(32) PRIMARY KEY,
 4    uname VARCHAR(100) NOT NULL
 5 );
 6 INSERT  INTO tb_user(uid,uname) VALUES (‘1‘,‘张三‘);
 7 /*分类表*/
 8 CREATE TABLE tb_category(
 9    cid CHAR(32) PRIMARY KEY,
10    cname VARCHAR(100) NOT NULL 
11 );
12 INSERT  INTO tb_category(cid,cname) VALUES (‘1‘,‘武侠‘);
13 INSERT  INTO tb_category(cid,cname) VALUES (‘2‘,‘言情‘);
14 /*商品图书表*/
15 CREATE TABLE tb_book(
16    bid CHAR(32) PRIMARY KEY,
17    bname VARCHAR(100) NOT NULL ,
18    price DECIMAL(5,1) NOT NULL ,
19    cid CHAR(32), /*书籍所属分类*/
20    FOREIGN KEY(cid) REFERENCES tb_category(cid) /*建立外键关系*/   
21 );
22 INSERT  INTO tb_book VALUES (‘1‘,‘天龙八部‘,‘68.5‘,‘1‘);
23 INSERT  INTO tb_book VALUES (‘2‘,‘霸道总裁爱上我‘,‘39.9‘,‘2‘);
24 /*订单表*/
25 CREATE TABLE tb_order(
26    oid CHAR(32) PRIMARY KEY,
27    totalPrice DECIMAL(10,0), /*订单合计*/
28    uid CHAR(32) , /*订单主人*/
29    FOREIGN KEY(uid) REFERENCES tb_user(uid) /*建立外键关系*/   
30 );
31 INSERT  INTO tb_order VALUES (‘1‘,‘176.9‘,‘1‘);
32 
33 /*订单条目*/
34 CREATE TABLE tb_orderItem(
35   oiid CHAR(32) PRIMARY KEY ,
36   `count` INT ,/*商品数量*/
37   subtotal DECIMAL(10,0),/*小计*/
38   oid CHAR(32),/*所属订单*/
39   bid CHAR(32),/*条目中的商品*/
40   FOREIGN KEY(oid) REFERENCES tb_order(oid),
41   FOREIGN KEY(bid) REFERENCES tb_book(bid)
42 );
43 INSERT  INTO tb_orderItem VALUES (‘1‘,‘2‘,‘137.0‘,‘1‘,‘1‘);
44 INSERT  INTO tb_orderItem VALUES (‘2‘,‘1‘,‘39.9‘,‘1‘,‘2‘);
45 
46 SELECT * FROM tb_user;
47 SELECT * FROM tb_category;
48 SELECT * FROM tb_book;
49 SELECT * FROM tb_order;
50 SELECT * FROM tb_orderItem;