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我们在创建内嵌数据集时会使用 SQL 查询语句从数据库中进行取数,普通的 SQL 查询语句是相对静态和固定的,而动态 SQL 语句本身不固定,它会根据实际场景的不同进行动态变化。
如下图所示,当用户选择不同的统计范围时,SQL 查询语句发生了变化,从而在数据库中获取到了不同的数据。
接下来我们看一下具体怎样应用动态 SQL 查询语句来实现图中的效果。
type=info
提示
本节内容涉及到报表内嵌数据集的数据过滤功能,相关介绍请参见数据集过滤。
如下图所示设置 参数名称 、 提示文本、数据类型 和 可用数据 。设置完成后,单击上方的返回箭头返回到报表设计器当中。
添加内嵌数据集。
本例中使用SQL语句: select 销售大区 as 地区名称, count(订单编号) as 订单量, sum(订单金额) as 销售额 from 销售明细 group by 销售大区 ,单击验证按钮,可见获取到3个查询字段。
type=info
提示
此处没有直接使用动态SQL查询语句是因为动态SQL语句不能直接获取到数据库中的字段列表,我们需要先通过静态SQL将需要的字段获取到,然后再改为动态SQL语句。
本例中使用:
select {Switch(@统计范围 = "大区", "销售大区", @统计范围 = "省份", "销售省份", @统计范围 = "城市", "销售城市")} as 地区名称, count(订单编号) as 订单量, sum(订单金额) as 销售额 from 销售明细 group by {Switch(@统计范围 = "大区", "销售大区", @统计范围 = "省份", "销售省份", @统计范围 = "城市", "销售城市")}
输入动态SQL语句后,单击验证和确定按钮。
在报表中添加一个文本框组件,将动态 SQL 语句粘贴到文本框中,这样做是为了方便我们查看实际进行数据查询的 SQL 语句。
添加两个文本框组件,分别输入“ 全国各 ”和“ 销售统计 ”字样并调整字体样式。
然后将报表参数拖拽至两个文本框之间,并调整字体样式,使其动态显示报表参数的值。
具体如下图所示。
选中标题区域,将图表的标题内容删除。
为绘图区域添加降序排序。
绑定数据集中的数据字段并适当调整表格宽度。
选中“ 销售额 ”明细单元格,调整数据格式为货币格式,如下图所示。
(9) 预览报表
当我们选择统计范围为“ 大区 ”时,SQL查询语句即为:select 销售大区 as 地区名称, count(订单编号) as 订单量, sum(订单金额) as 销售额 from 销售明细 group by 销售大区
因此“ 地区名称 ”实际为“ 销售大区 ”,并且数据按照“ 销售大区 ”进行分组统计。
当我们选择统计范围为“ 省份 ”时,SQL查询语句即为:select 销售省份 as 地区名称, count(订单编号) as 订单量, sum(订单金额) as 销售额 from 销售明细 group by 销售省份
此时“ 地区名称 ”实际为“ 销售省份 ”,并且数据按照“ 销售省份 ”进行分组统计。