Comments (1)
在物联网应用中,常会采集比较多的数据项,用于实现智能控制、业务分析、设备监控等。由于应用逻辑的版本升级,或者设备自身的硬件调整等原因,数据采集项就有可能比较频繁地出现变动。为了在这种情况下方便地完成数据记录工作,TDengine 从 2.2.0.0 版本开始,提供调用 Schemaless 写入方式,可以免于预先创建超级表/子表的步骤,随着数据写入接口能够自动创建与数据对应的存储结构。并且在必要时,Schemaless 将自动增加必要的数据列,保证用户写入的数据可以被正确存储。
无模式写入方式建立的超级表及其对应的子表与通过 SQL 直接建立的超级表和子表完全没有区别,你也可以通过,SQL 语句直接向其中写入数据。需要注意的是,通过无模式写入方式建立的表,其表名是基于标签值按照固定的映射规则生成,所以无法明确地进行表意,缺乏可读性。
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