根据一级标题查询书本的信息

根据一级标题查询二级标题的信息

根据二级标题查询书本的信息

根据二级标题查询一级标题的信息

分页查询

Mapper

    //编辑推荐 根据销量查询前二少public List<Book> selectBookByEdit();//热销推荐 根据销量查询前三多public List<Book> selectBookByHotBuy();//最新上架 根据日期查询前三新public List<Book> selectBookByNewDate();//新书热卖 根据日期降序销量降序取前二public List<Book> selectBookByNewDateAndHotBuy();//根据id查询public Book selectBookById(Integer id);//查询一级类别分页展示数据List<Book> selectBookByPageLevelOne(@Param("categoryId") Integer categoryId, @Param("pageIndex") Integer pageIndex, @Param("pageSize") Integer pageSize);//查询二级类别 分页展示数据List<Book> selectBookByPageLevelTwo(@Param("categoryId") Integer categoryId, @Param("pageIndex") Integer pageIndex, @Param("pageSize") Integer pageSize);//查询一级类别总条数Integer selectBookByLevelOne(@Param("categoryId") Integer categoryId);//查询二级类别总条数Integer selectBookByLevelTwo(@Param("categoryId")Integer categoryId);public interface CategoryMapper {//查询所有类别public List<Category> selectAllCategory();//根据一级分类id查询二级分类public Category selectCategoryById(Integer id);//查询一级分类的图书public List<Book> selectBookByLevelOne(Integer id);//根据二级分类id查询一级分类public Integer selectLevelOneByTwo(Integer id);//根据二级分类查询图书public List<Book> selectBookByLevelTwo(Integer id);//查询二级分类的图书个数public List<Category> selectLevelTwoNum(Integer id);}

SQL/Mapper

    Book：<select id="selectBookByPageLevelOne" resultMap="bookResultMap">select * from d_bookwhere cid in(select category_id from d_category where parent_id=#{categoryId})limit #{pageIndex},#{pageSize}</select><select id="selectBookByPageLevelTwo" resultMap="bookResultMap">select * from d_bookwhere cid=#{categoryId}limit #{pageIndex},#{pageSize}</select><select id="selectBookByLevelOne" resultType="java.lang.Integer">select count(*) from d_bookwhere cid in(select category_id from d_category where parent_id=#{categoryId})</select><select id="selectBookByLevelTwo" resultType="java.lang.Integer">select count(*) from d_book where cid=#{categoryId}</select>Category：<select id="selectAllCategory" resultMap="categoryResultMap">select father.*,child.category_id cid,child.category_name cnamefrom d_category father inner join d_category childon child.parent_id = father.category_id</select><select id="selectCategoryById" resultMap="categoryResultMap">select father.*,child.category_id cid,child.category_name cnamefrom d_category father inner join d_category childon child.parent_id = father.category_id where father.category_id = #{id}</select><select id="selectBookByLevelOne"             resultMap="com.baizhi.mapper.BookMapper.bookResultMap">select * from d_book where cid in(select child.category_id from d_category father INNER JOIN d_category childon child.parent_id = father.category_id where father.category_id = #{id})</select><select id="selectLevelTwoNum" resultMap="categoryResultMap">select c.category_id,c.category_name,count(book_id) book_count from d_book b         RIGHT JOIN d_category c ON b.cid = c.category_idwhere c.parent_id=#{id} GROUP BY c.category_id</select><select id="selectBookByLevelTwo" resultMap="com.baizhi.mapper.BookMapper.bookResultMap">select * from d_book where cid=#{id}</select><select id="selectLevelOneByTwo" resultType="java.lang.Integer">select father.category_id from d_category father left join d_category child on father.category_id = child.parent_id where child.category_id = #{id}</select>

Controller

@RequestMapping("/showMain")public String showAll(Model model, HttpSession session) {User user = (User) session.getAttribute("user");if (user!=null){List<Book> editBooks = bookService.selectBookByEdit();List<Book> hotBooks = bookService.selectBookByHotBuy();List<Book> newBooks = bookService.selectBookByNewDate();List<Book> newHotBooks = bookService.selectBookByNewDateAndHotBuy();model.addAttribute("editBooks", editBooks);model.addAttribute("hotBooks", hotBooks);model.addAttribute("newBooks", newBooks);model.addAttribute("newHotBooks", newHotBooks);//类别List<Category> categories = categoryService.selectAllCategory();model.addAttribute("categories", categories);return "/main/main";}else {return "user/login_form";}}
//分页Controller实现@RequestMapping("selectBookByOne")private String selectBookByOne(Integer categoryId,Integer pageIndex,Integer pageSize,Model model) {//查询一级标题下的二级标题List<Category> categories = categoryService.selectLevelTwoNum(categoryId);model.addAttribute("categories", categories);Category category = categoryService.selectCategoryById(categoryId);model.addAttribute("category", category);List<Book> books = bookService.selectBookByPageLevelOne(categoryId, pageIndex, pageSize);model.addAttribute("books",books);//书本总数Integer integer = bookService.selectBookByLevelOne(categoryId);//页数int totalPage = 0;if (integer%pageSize==0){totalPage = integer/pageSize;}else {totalPage = integer/pageSize+1;}//当前页model.addAttribute("method","selectBookByOne.do");model.addAttribute("pageIndex",pageIndex);//categoryIdmodel.addAttribute("c",categoryId);model.addAttribute("integer",integer);model.addAttribute("totalPage",totalPage);return "main/book_list";}@RequestMapping("selectBookByTwo")private String selectBookByTwo(Integer categoryId,Integer pageIndex,Integer pageSize,Model model) {Integer i = categoryService.selectLevelOneByTwo(categoryId);//查询分类Category category = categoryService.selectCategoryById(i);model.addAttribute("category", category);//查询二级分类的图书个数List<Category> categories = categoryService.selectLevelTwoNum(i);model.addAttribute("categories", categories);//查询二级分类的图书总个数Integer sum = 0;for (Category c : categories) {sum += c.getBookCount();}model.addAttribute("sum", sum);//二级标题下的所有图书List<Book> books = bookService.selectBookByPageLevelTwo(categoryId, pageIndex, pageSize);model.addAttribute("books",books);System.out.println(pageIndex);//书本总数Integer integer = bookService.selectBookByLevelTwo(categoryId);//页数int totalPage = 0;if (integer%pageSize==0){totalPage = integer/pageSize;}else {totalPage = integer/pageSize+1;}System.out.println(totalPage);model.addAttribute("method","selectBookByTwo.do");//当前页model.addAttribute("pageIndex",pageIndex);//categoryIdmodel.addAttribute("c",categoryId);model.addAttribute("integer",integer);model.addAttribute("totalPage",totalPage);return "main/book_list";}

JSP

<c:forEach items="${categories}" var="category">[<a href='${pageContext.request.contextPath}/book/selectBookByOne.do?        categoryId=${category.id}&pageIndex=1&pageSize=5'>${category.name}</a>]
<c:forEach items="${category.child}" var="child"><a href='${pageContext.request.contextPath}/book/selectBookByTwo.do?categoryId=${child.id}&pageIndex=1&pageSize=5'>${child.name}</a>
</c:forEach>

<c:if test="${pageIndex>1}"><div class='list_r_title_text3a'><a name=link_page_next href="${pageContext.request.contextPath}/book/${method}?categoryId=${c}&pageIndex=${pageIndex-1}&pageSize=5"><img src='../images/page_up.gif' /> </a></div>
</c:if>

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Mapper

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Controller

JSP

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