Question

我正在使用C＃中的一个Windows应用程序。在那里，我想在表格布局面板中显示类别明智的书籍图像。我希望每个类别显示5本图书图像。

我用来检索类别明智的书的查询是

WITH CategoryCTE AS (
    SELECT 
        BookName,
        ROW_NUMBER() OVER (
            PARTITION BY CategoryName
            ORDER BY CategoryName DESC
        ) AS CTE_Order
    FROM BookMaster
)
SELECT bm.BookName,bm.BookImage, cm.CategoryName, scm.SubCategoryName
FROM 
    CategoryCTE 
    INNER JOIN BookMaster bm ON CategoryCTE.BookName = bm.BookName
    INNER JOIN CategoryMaster cm ON bm.CategoryName = cm.Oid
    INNER JOIN SubCategoryMaster scm ON bm.SubCategoryName = scm.Oid
WHERE CategoryCTE.CTE_Order < 6
GROUP BY cm.CategoryName, scm.SubCategoryName, bm.BookName,bm.BookImage

这个查询给了我正确的输出，即它给了我每个类别的5本书。但问题是，我想在表格面板中显示书籍图像，第1行将有5个类别1的书籍图像，第2行具有类别2的书籍图像，依此类推。现在我的数据库中有4个书籍类别。表格布局面板的行取决于数据库中的类别表，表格列是固定的，即第一列是类别名称，另外5列是书籍图像。

我希望我已经正确解释了我的问题。请为我提出任何解决方案。提前致谢。

Answer 1

如果您希望结果如下所示：

CategoryName   Book1         Book2             Book3           Book4          Book5
------------   -----------   ---------------   --------------  -------------  ------------
Cat1           Image#6.jpg   Image#61.jpg      Image#62.jpg    Image#63.jpg   Image#64.jpg
Cat2           Image#5.jpg   Image#51316.jpg   Image#5136.jpg  Image#516.jpg  Image#56.jpg

以下查询应该这样做：

WITH CategoryCTE AS (
    SELECT 
        BookName,
        ROW_NUMBER() OVER (
            PARTITION BY CategoryName
            ORDER BY CategoryName DESC, BookName
        ) AS CTE_Order
    FROM BookMaster    
)

SELECT CategoryName, [1] AS Book1, [2] AS Book2, [3] AS Book3, [4] AS Book4, [5] AS Book5
FROM 
(SELECT bm.BookImage, cm.CategoryName, c.CTE_Order FROM 
    CategoryCTE c
    INNER JOIN BookMaster bm ON c.BookName = bm.BookName
    INNER JOIN CategoryMaster cm ON bm.CategoryName = cm.Oid
    INNER JOIN SubCategoryMaster scm ON bm.SubCategoryName = scm.Oid
WHERE c.CTE_Order < 6
GROUP BY cm.CategoryName, bm.BookImage, c.CTE_Order
) Sub
PIVOT (MAX(BookImage) FOR CTE_Order IN ([1],[2],[3], [4],[5])) AS PivotTable

如何动态显示表格面板中的数据

1 个答案: