Hi, there I am very new to node red and this is first message here I want to build database then want to store some values inside database and then want to read database and compare with inject value then if it is same then debug true can you please guide me how to do it and if there is an exampl…

The payload isn't a string if the message exists, it is an array of length 1. If there were multiple matching records then there would be one element for each record. However, since all you are interested in is whether a record exists or not I think you would be better using the query SELECT cou…

I want to get value from mqtt and insert inside variable (check) then msg.topic= "SELECT * FROM tab WHERE name = 'check'"; but it is not working

So how are you attempting to do that? Without showing your code we can not help.

[{"id":"d7bd381c.a59b28","type":"tab","label":"Flow 4","disabled":false,"info":""},{"id":"b454bc8.2a2c94","type":"switch","z":"d7bd381c.a59b28","name":"","property":"payload","propertyType":"msg","rules":[{"t":"cont","v":"10","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":470,"y":180,…

This is a diffrent question than you originally asked. You canstart by putting the value you want to search for in msg.payload/ Then using a CHANGE node you can set the topic by building the sql statement using the json expression. Something like "SELECT * FROM tab WHERE name = '" & $.payload & "';…

@zenofmud my question now how to compare msg.payload with a variable value using switch node? https://discourse.nodered.org/uploads/short-url/ksLUSqtzWQnrt5Oncd2S3prCorg.png

"Contains" in the switch node is for testing if a string contains another string, for example payload might be "abcde" and the Contains might be "bcd". If you are actually looking for equal to a variable value then select == then click on the dropdown to the right and you can select msg. something.…

@Colin thank so much it getting working with switch node comparing with variable

I'm looking for the same solution, could you maybe share your code?

[image] Andre: I'm looking for the same solution, could you maybe share your code? Several different questions were addressed in this thread. It would be a good idea to make it clear what particular problem you are trying to solve. However do please read right through the thread and see if …

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I have some questions relating database

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Colin 1 December 2018 09:25 55

You flow is not importable. Please see this on how to share your flow.

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I have some questions relating database

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