Writing a file on demand

[knimerin]

Hi,
I only want to write a xlsx file if certain conditions apply. Is there a possibility to prevent the write node from executing?

[mlauber71]

@knimerin you can use a CASE Switch Start – KNIME Community Hub node to decide to run a (writer) node or not.

You could take a look at this example in the green box:

Error Handling within Table Row to Variable Loop Start

@JGebhard I wanted to build a workflow that would do a try catch anyway. It does follow the model and would try to append sheets to an existing Excel file. In the first instance of the outer loop a _temp.table will be written that would contain the procedures and one could follow if the loop was successfil. [image] Within the component an inner loop would try 10 times (you could adapt that) to finish the job. A Try Catch block would check if the operation was successful and fill a Flow Varia…

Switch Workflow Branch Execution Depending on the Input Data – knime

[tqAkshay95]

Hello @knimerin

Could you please provide an example of a condition that needs to be met for an ‘if’ statement, and if that condition is not met, what action you would like to take in the ‘else’ clause?

Additionally You can use the

IF Switch

and

CASE Switch Start