如何使用Node-RED編輯器將參數傳遞給dashDB查詢？

在Bluemix Node-RED應用程序中，我使用Cloudant和dashDB服務。我將Cloudant數據庫複製到dashDB中，其中包含存儲在表中的多個值，如DALERT，DEVICE，ID等。如何使用Node-RED編輯器將參數傳遞給dashDB查詢？

我試圖從dALDB列中使用DALERT列搜索CLAYDANT表中的記錄，該值等於臨界值。

我想這些方式的節點RED編輯器，但無法從dashDB檢索數據：

[ 
{"id":"9941f62b.66be08","type":"http in","name":"","url":"/get/specificcritical","method":"get","swaggerDoc":"","x":103.5,"y":409,"z":"c96fb1cb.36905","wires":[["b52196bf.4ade68","292d3e2e.d6d2c2"]]}, 
{"id":"b52196bf.4ade68","type":"function","name":"","func":"msg.Dalert=msg.payload.Dalert;\n\nreturn msg;","outputs":1,"noerr":0,"x":326,"y":353,"z":"c96fb1cb.36905","wires":[["457cf34.fba830c","d937915d.26c87"]]}, 
{"id":"457cf34.fba830c","type":"dashDB in","service":"dashDB-9a","query":"select * from XXXXX.CLOUDANT WHERE DALERT=?;","params":"msg.Dalert","name":"","x":510,"y":404,"z":"c96fb1cb.36905","wires":[["60d36407.9f2c9c","886c48df.7793b8"]]}, 
{"id":"d937915d.26c87","type":"debug","name":"","active":false,"console":"true","complete":"payload","x":599,"y":327,"z":"c96fb1cb.36905","wires":[]}, 
{"id":"60d36407.9f2c9c","type":"debug","name":"","active":true,"console":"false","complete":"false","x":758,"y":397,"z":"c96fb1cb.36905","wires":[]}, 
{"id":"886c48df.7793b8","type":"http response","name":"","x":771,"y":477,"z":"c96fb1cb.36905","wires":[]}, 
{"id":"292d3e2e.d6d2c2","type":"debug","name":"","active":true,"console":"true","complete":"payload","x":321,"y":483,"z":"c96fb1cb.36905","wires":[]} 
]

請讓我知道是否有任何解決方案。

來源

2015-10-20 supriya

你將不得不放棄了很多更詳細的瞭解你正在嘗試做的任何人將能夠幫助你面前 – hardillb

如果我理解正確你的問題，你只需要使用一些類似的修改function節點：

msg.dalert="critical"; 
return msg;

在CLOUDANT表假設你DALERT列是VARCHAR類型。如果您的數據庫是不同的類型，則可能需要更改它。

運行應用程序，如：

http://yourappname.mybluemix.net/get/specificcritical

會導致如下輸出爲我的表：

[ 
    { 
    "DALERT": "critical", 
    "DEVICE": "device1", 
    "ID": 1 
    }, 
    { 
    "DALERT": "critical", 
    "DEVICE": "device3", 
    "ID": 3 
    }, 
    { 
    "DALERT": "critical", 
    "DEVICE": "device5", 
    "ID": 5 
    } 
]

這裏是我與變化所造成的新的節點流量（我加一個帶空白消息的input節點只是爲了測試編輯器中的流程）：

[{"id":"c7468303.38b98","type":"http in","name":"","url":"/get/specificcritical","method":"get","swaggerDoc":"","x":125,"y":245,"z":"8e2ae4a.f71d518","wires":[["c685ce8c.397a3","20dfeeba.df2012"]]},{"id":"c685ce8c.397a3","type":"function","name":"","func":"msg.dalert=\"critical\";\nreturn msg;","outputs":1,"noerr":0,"x":347.5,"y":189,"z":"8e2ae4a.f71d518","wires":[["e1f8c153.1e074","1f2d6f8e.e0d29"]]},{"id":"e1f8c153.1e074","type":"dashDB in","service":"dashDB-0a","query":"select * from CLOUDANT WHERE DALERT=?;","params":"msg.dalert","name":"","x":531.5,"y":240,"z":"8e2ae4a.f71d518","wires":[["f1810e4c.0e7ef","1401dc1a.ebfe24"]]},{"id":"1f2d6f8e.e0d29","type":"debug","name":"","active":false,"console":"true","complete":"payload","x":620.5,"y":163,"z":"8e2ae4a.f71d518","wires":[]},{"id":"f1810e4c.0e7ef","type":"debug","name":"dashDB Output","active":true,"console":"false","complete":"payload","x":779.5,"y":233,"z":"8e2ae4a.f71d518","wires":[]},{"id":"1401dc1a.ebfe24","type":"http response","name":"","x":792.5,"y":313,"z":"8e2ae4a.f71d518","wires":[]},{"id":"20dfeeba.df2012","type":"debug","name":"","active":true,"console":"true","complete":"payload","x":342.5,"y":319,"z":"8e2ae4a.f71d518","wires":[]},{"id":"1f530672.e0acfa","type":"inject","name":"","topic":"","payload":"","payloadType":"none","repeat":"","crontab":"","once":false,"x":122,"y":112,"z":"8e2ae4a.f71d518","wires":[["c685ce8c.397a3"]]}]

來源

2015-10-21 02:08:17

我回答了問題。

如果我們想要傳遞值作爲參數只寫msg.variable = msg.payload.variable;並返回味精; 裏面的函數節點和msg.variable也在dashDB IN節點中的查詢parm中聲明。例如：msg.Dalert = msg.payload.Dalert;和臨界值與URL傳遞爲http://yourappname.mybluemix.net/get/specificcritical?Dalert=critical

其簡單的工作節點紅色血流

[ 
{"id":"9941f62b.66be08","type":"http in","name":"","url":"/get/specificcritical","method":"get","swaggerDoc":"","x":103.5,"y":409,"z":"c96fb1cb.36905","wires":[["b52196bf.4ade68","292d3e2e.d6d2c2"]]}, 
{"id":"b52196bf.4ade68","type":"function","name":"","func":"msg.Device=msg.payload.Device;\n\nreturn msg;","outputs":1,"noerr":0,"x":326,"y":353,"z":"c96fb1cb.36905","wires":[["457cf34.fba830c","d937915d.26c87"]]}, 
{"id":"457cf34.fba830c","type":"dashDB in","service":"dashDB-XX","query":"select * from XXXXX.CLOUDANT WHERE DEVICE=?","params":"msg.Device","name":"","x":510,"y":404,"z":"c96fb1cb.36905","wires":[["60d36407.9f2c9c","886c48df.7793b8"]]}, 
{"id":"d937915d.26c87","type":"debug","name":"","active":false,"console":"true","complete":"payload","x":599,"y":327,"z":"c96fb1cb.36905","wires":[]}, 
{"id":"60d36407.9f2c9c","type":"debug","name":"","active":true,"console":"false","complete":"false","x":758,"y":397,"z":"c96fb1cb.36905","wires":[]}, 
{"id":"886c48df.7793b8","type":"http response","name":"","x":771,"y":477,"z":"c96fb1cb.36905","wires":[]}, 
{"id":"292d3e2e.d6d2c2","type":"debug","name":"","active":true,"console":"true","complete":"payload","x":321,"y":483,"z":"c96fb1cb.36905","wires":[]} 
]

來源

2015-10-21 09:30:07 supriya

如何使用Node-RED編輯器將參數傳遞給dashDB查詢？

回答

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