kuiper 规则sql写法

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