创建规则对接收到的报文数据进行业务过滤，报文有各种结构的，下面对各种结构报文sql过滤使用进行说明

下面sql规则统一对temperature大于20的数据进行过滤

1：单层结构报文

{"temperature": 35,"humidity": 66
}

sql写法如下

select * from zjrg where temperature>20 and isNull(temperature) = FALSE 

2：双层结构报文

{"dl": {"temperature": 100,"humidity": 0}
}

sql写法如下

select * from zjrg where dl.temperature>20 and isNull(dl.temperature) = FALSE 

3：多层数组类型报文结构

{"deviceValueE": [{"da": "plc_pump1","dl": {"temperature": 100,"humidity": 65}},{"da": "plc_pump2","dl": {"temperature": 0,"humidity": 66}}],"ts": "2022-07-07 16:50:42"
}

sql写法如下

select * from zjrg where deviceValueE[0].dl.temperature>20 and isNull(deviceValueE[0].dl.temperature) = FALSE