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在创建 Json 数据源时,如果我们将预查询选择为 SQL语句(使用Json函数) 时,则可以使用 SQL 语句对 Json 数据进行预处理。
这样数据设计人员可以重新构建数据结构(例如输出连接的结果表)并隐藏不必要的数据细节,灵活的规划 Json 数据。
上图SQL语句中使用了 unwindJson 、 cross apply 等Json函数对源json数据进行了处理。
隐藏了大部分字段,仅提取了部分需要的字段,并且将“ author ”列的内容展开后与原表进行了拼接。
type=info
提示
在JSON数据源连接界面中,SQL语句使用“@source”来引用配置的JSON内容。
本节内容中介绍的 Json 函数:
可以在连接 Json 数据源的时候可以使用。
在创建自定义表的 SQL 语句时(数据源为 Excel、Json、Xml、CSV、MongoDB 或者 Odata 均可以使用)。
在报表中使用 SQL 创建内嵌数据集(数据源为 Excel、Json、Xml、CSV、MongoDB或者 Odata 时均可以使用)。
文中以连接Json 数据源为例,为您介绍这些函数的用法。
系统中支持的 Json 函数主要有:
表值函数 UnwindJson、UnwindArray 。
表连接函数 Cross Apply、Outer Apply
以及JsonValue、JsonQuery。
接下来,为您详细介绍这几种 Json 函数的具体用法。