What's wrong with msg.topic : the query is not defined as a string?

i want to collect data and then send it to database, but it said msg.topic : the query is not defined as a string". i don't know how to fix it.

Difficult to tell from just a picture.

Either share your flow or show where you set topic.

Ps, try adding node.warn(typeof msg.topic) in the function AFTER you have generated your SQL statement.

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Hi, in order to make code more readable and importable it is important to surround your code with three backticks
```
like this
```

You can edit and correct your post by clicking the pencil icon.

See this post for more details - How to share code or flow json

Also add a debug node showing what is going into the db node and check that msg.topic contains the correct query. Set the debug node to show Complete Message.

Thanks for helping.i will add a debug.

You must create your sql query and put it in msg.topic.

Nowhere in your flow do I see a valid sql query - Do you know how to format an sql 'insert' statement?

If not, you might want to do some reading.