Question

我有以下gridview：

<asp:GridView ID="gvTimeline" ShowHeader="true"  runat="server" ShowHeaderWhenEmpty="true" AutoGenerateColumns="false" >
<Columns>
         <asp:BoundField DataField="8" ItemStyle-Width="25%" DataFormatString="{0:dd-MM-yyyy}" />
         <asp:BoundField DataField="2" ItemStyle-Width="25%" DataFormatString="{0:dd-MM-yyyy}" />
         <asp:BoundField DataField="6" ItemStyle-Width="25%" DataFormatString="{0:dd-MM-yyyy}" />
         <asp:BoundField DataField="4" ItemStyle-Width="25%" DataFormatString="{0:dd-MM-yyyy}" />
</Columns>
</asp:GridView>

以及以下sql表：

Id   |  type  |  date

2    |    8   |  22/09/1997   
1    |    6   |  22/09/1998   
3    |    4   |  22/09/1999

我想要的是运行sql行，并用与类型（仅1行）相对应的日期填充每一列。每个数据字段都是一个类型。最好的方法是什么，然后再正常访问每个id？

我希望如此：

8                 2                 6              4
22/09/1997      null          22/09/1998       22/09/1999

Answer 1

如果仅限制这些值，那么创建一个简单的视图并绑定到 it 可能是最简单的方法。例如：

CREATE VIEW view_for_gridview_binding AS
  SELECT DISTINCT
    eight.[date] as '8'
    , two.[date] as '2'
    , six.[date] as '6'
    , four.[date] as '4'
  FROM table_for_gridview_question 
  LEFT JOIN table_for_gridview_question AS eight ON (eight.[type] = 8)
  LEFT JOIN table_for_gridview_question AS two ON (two.[type] = 2)
  LEFT JOIN table_for_gridview_question AS six ON (six.[type] = 6)
  LEFT JOIN table_for_gridview_question AS four ON (four.[type] = 4)
GO

这里是测试：

CREATE TABLE table_for_gridview_question (
    Id int NOT NULL,
    [type] int NOT NULL,
    [date] date NOT NULL
)
GO

INSERT INTO table_for_gridview_question
SELECT 2, 8, '1997-09-22'
UNION
SELECT 1, 6, '1998-09-22'
UNION
SELECT 3, 4, '1999-09-22'
GO

CREATE VIEW view_for_gridview_binding AS
    SELECT DISTINCT
        eight.[date] as '8'
        , two.[date] as '2'
        , six.[date] as '6'
        , four.[date] as '4'
    FROM table_for_gridview_question 
    LEFT JOIN table_for_gridview_question AS eight ON (eight.[type] = 8)
    LEFT JOIN table_for_gridview_question AS two ON (two.[type] = 2)
    LEFT JOIN table_for_gridview_question AS six ON (six.[type] = 6)
    LEFT JOIN table_for_gridview_question AS four ON (four.[type] = 4)
GO

SELECT * FROM view_for_gridview_binding

DROP VIEW view_for_gridview_binding
DROP TABLE table_for_gridview_question

SELECT的结果：

8          2          6          4
---------- ---------- ---------- ----------
1997-09-22 NULL       1998-09-22 1999-09-22

但是，如果您的type可以是任何东西，则可能需要考虑阅读PIVOT和UNPIVOT，就像动态枢轴版本中所描述的那样答案here的一部分。

在gridview的已定义列中显示多行

1 个答案: