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       
(Showing Draft Content)

级联查询

功能概述

查询参数不仅可以用于过滤展示在报表中的数据集数据,也可以用于过滤其他参数的“可用数据”,从而实现级联过滤的查询效果。

下图是一个典型的级联查询应用示例,在此示例中,报表展示的内容为某个城市的销售情况。

为了方便城市的选择,先按地区(比如西北)过滤出该地区的城市列表,然后从下拉列表中选择一个城市,查看该城市的销售情况。

image2020-6-10_10-18-13.png


接下来为您介绍实现这种级联查询效果的具体操作步骤。

操作示例

1. 定义“ 地区 ”数据集

添加基于WynDemoData的内嵌数据集,配置数据集名称为“ 地区 ”,查询语句为: select distinct 销售大区 from 销售明细

然后单击验证确定保存数据集定义。

image2019-8-21_9-58-0.png

2. 添加报表参数

以此数据集为基础,添加一个报表参数,如下图:

image2020-6-10_10-9-33.png

3. 定义“城市”数据集

以此参数作为查询条件,定义第二个数据集“ 城市 ”,其查询语句为: select distinct 销售城市 from 销售明细 where 销售大区=@查询参数1

如下图:

image2020-11-2_15-50-35.png

4. 添加第二个报表参数

以此“ 城市 ”数据集为基础,定义第二个报表参数,如下图:

image2020-6-10_10-11-50.png

5. 定义最终展示用的数据集

现在定义最终展示在报表中的数据集,其查询语句为: select * from 销售明细 where 销售城市=@查询参数1

image2020-11-2_15-54-6.png

6. 添加表格组件

从工具箱拖放一个表格到设计区,单元格中均绑定“ 销售详情 ”数据集中的字段,如下图。

image2020-6-10_10-15-29.png

image2020-11-2_15-55-31.png

7. 预览报表

先选择“ 销售大区 ”,再选择“ 销售城市 ”,然后单击预览按钮,报表将显示所选城市的销售情况。如下图:

image2020-6-10_10-17-55.png