Opcua client sqlite not working

Industrial
1

Hello,

I am currently working on creating a datalogger using OPCUA. For some reason, I'm unable to get the msg.payload into the sqlite, because it's saying that the payload is undefined. Could anyone help with this Issue?
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Thank you for your time.

2

Welcome to the forum @nathan1

It is saying that you are trying to access column named undefined. Use a debug node to see what is coming out of the write query function so that you can check what you are actually sending to the database.

3

Hi @Colin,
This is what I'm seeing:

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This is my first time using Node-Red, I'm still a newbie.
Thank you,
Nathan

4

Here's the writequery function:
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5

msg.topic should be a string containing the query. Possibly something like
msg.topic = "INSERT INTO RANDOMNUM VALUES (" + x + ")"
Though I find it much easier to use this syntax for making complex strings

msg.topic = `INSERT INTO RANDOMNUM VALUES ( ${x} )`

Also make debug 3 output Complete Message so you can more easily see what is in the topic.
In addition I recommend adding another debug node showing what is going into the function to check that what you expect is there.

6

Hi Colin,
It seems that it's getting NULL into the writequery function. I'm not sure why since Debug3 is getting the correct message.

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7

I moved it up to the first output and it seems to be giving an output now. However, the query is still empty.

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8

Your function is not connected to the sqlite node.

9

Thank you it works now. I have another question with read multiple. Is there a way to put the payload values in 1 array?

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10

Is this a question about opcua or sqlite? If it is an opcua question it might be better to start a new thread. I have never used opcua.

11

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