解析 CSV 输入
问题
您希望解析 CSV 数据以使用其中包含的值。
解决方案
CSV 节点可用于解析 CSV 并从中生成 JavaScript 对象。
示例
[{"id":"73e4e16.4d9742","type":"inject","z":"64133d39.bb0394","name":"Inject","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":110,"y":780,"wires":[["2bef78fd.ae70f8"]]},{"id":"90ed51dc.dcc71","type":"csv","z":"64133d39.bb0394","name":"","sep":",","hdrin":true,"hdrout":false,"multi":"mult","ret":"\\n","temp":"","skip":"1","x":410,"y":780,"wires":[["9aace6e7.adc538"]]},{"id":"9aace6e7.adc538","type":"debug","z":"64133d39.bb0394","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":570,"y":780,"wires":[]},{"id":"2bef78fd.ae70f8","type":"template","z":"64133d39.bb0394","name":"CSV data","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"# This is some random data\na,b,c\n80,18,2\n52,36,10\n91,18,61\n32,47,65","output":"str","x":260,"y":780,"wires":[["90ed51dc.dcc71"]]}]
讨论
在此示例中，流注入了包含 CSV 数据的有效负载。
# This is some random data
a,b,c
80,18,2
52,36,10
91,18,61
32,47,65
CSV 已配置为忽略输入的**第一行**，因此它会忽略初始注释行。然后它使用**下一行**获取列名，并使用**剩余行**获取数据。
在这个特定的示例中，节点也已配置为发送包含所有数据的**单个消息**。这会产生一个带有以下有效负载的消息：
[
{ a: 80, b: 18, c: 2},
{ a: 52, b: 36, c: 10},
{ a: 91, b: 18, c: 61},
{ a: 32, b: 47, c: 65},
]
还可以将节点配置为为**每一行数据**发出一条消息。在这种模式下，消息还将包含 msg.parts 属性，该属性允许将它们传递给 Join 节点以将它们重新组合成一个数组。
