Visual Studio 2015 报表设计器嵌套数据答案

【问题标题】：Visual Studio 2015 Report Designer nested dataVisual Studio 2015 报表设计器嵌套数据
【发布时间】：2017-02-05 05:07:28
【问题描述】：

我在 MySQL 中有数据，例如：

+----+----------+--------+
| Id | grade    | defect |
+----+----------+--------+
| 1  | Grade #2 | dented |
+----+----------+--------+
| 1  | Grade #3 |        |
+----+----------+--------+
| 1  | Grade #4 | dented |
+----+----------+--------+
| 1  | Grade #5 |        |
+----+----------+--------+
| 1  | Grade #4 | short  |
+----+----------+--------+
| 1  | Grade #5 |        |
+----+----------+--------+
| 1  | Grade #1 | short  |
+----+----------+--------+
| 1  | Grade #6 |        |
+----+----------+--------+
| 1  | Grade #2 | broken |
+----+----------+--------+
| 1  | Grade #2 | long   |
+----+----------+--------+
| 1  | Grade #3 |        |
+----+----------+--------+

我想在 Visual Studio 报表设计器中创建报表。我可以创建一些查询并生成如下报告：

+----------------------+
| Grade          Count |
+----------------------+
| Grade #1       1     |
+----------------------+
| Grade #2       3     |
+----------------------+
| Grade #3       2     |
+----------------------+
| Grade #4       2     |
+----------------------+
| Grade #5       2     |
+----------------------+
| Grade #6       1     |
+----------------------+
| Total          11    |
+----------------------+
|                      |
+----------------------+
| Defect         Count |
+----------------------+
| dented         2     |
+----------------------+
| short          2     |
+----------------------+
| broken         1     |
+----------------------+
| long           1     |
+----------------------+
| Total          6     |
+----------------------+

但是，我想要更像这样的东西：

+-----------------------------+
| Grade                 Count |
+-----------------------------+
| Grade #1              1     |
+-----------------------------+
|     Short                   |
+-----------------------------+
| Grade #2              3     |
+-----------------------------+
|     dented                  |
+-----------------------------+
|     broken                  |
+-----------------------------+
|     long                    |
+-----------------------------+
| Grade #3              2     |
+-----------------------------+
| Grade #4              2     |
+-----------------------------+
|     dented                  |
+-----------------------------+
|     short                   |
+-----------------------------+
| Grade #5              2     |
+-----------------------------+
| Grade #6              1     |
+-----------------------------+
| Total                 11    |
+-----------------------------+

我确信这是可能的，但我不知道该怎么做。有人可以指出我正确的方向吗？同样，我正在使用 Visual Studio 2015、mysql、vb.net 和报表设计器。我看到提到了团体、孩子/父母等，但我看不出有什么方法可以做到这一点。提前致谢。哎呀，现在我很乐意在 mysql 中进行查询并显示在表格中。

【问题讨论】：

标签： mysql vb.net visual-studio-2015 reporting

【解决方案1】：

MySQL 的 GROUP_CONCAT() 可以为您提供包含您想要的信息的内容，尽管不是您输出的确切格式：

SELECT grade,
       COUNT(*) AS defect_count,
       GROUP_CONCAT(COALESCE(defect, '')) AS defects
FROM yourTable
GROUP BY grade

输出：

Grade #1 | 1 | short
Grade #2 | 3 | dented, broken, long
Grade #3 | 2 |
Grade #4 | 2 | dented, short
Grade #5 | 2 |
Grade #6 | 1 |

【讨论】：

concat 的问题是它吞噬了东西方的房地产。这是我正在重写的应用程序的当前问题。如果我得到太多独特的缺陷，它将不适合页面。我宁愿尝试做北/南，那只是另一页。不过感谢您的建议。

【解决方案2】：

这是我想出的，查询：

SELECT 
Grade,
SUM(Plated) AS Plated,
SUM(iF(Reject_Reason <> "", 1, 0)) AS Rejects,
Reject_Reason AS `Name`,
COUNT(Reject_Reason) As `Count`
 FROM
sorting.data
WHERE
job_name = @JobName
GROUP BY Grade, Reject_Reason

这让我很接近，其余的都在报表设计器中完成。我添加了一个子组。我对它的结果很满意。看示例报告，忽略数据，我只是在里面扔了一些东西。

Report setup, child group sample report

【讨论】：