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11_​Workflow_​Control

Workflow Control

Exercise 11 for the KNIME Analytics Platform for Data Wranglers course
- Write subsets of a file using a loop
- Read and concatenate many files using a loop
- Activate a workflow branch based on a user selection

Activity III: CASE Switch Extend the workflow below with a switch that only creates one type of visualization. - Create a Single Selection Configuration node with the possible values "scatter" and "bar" - Use the CASE Switch Data (Start) that activates the top/middle branch depending on the selection scatter/bar (Use the "...(index)" flow variable to define the activeport)- Combine the outputs of the two branches with the CASE Switch Data (End) node Activity I: Write Multiple Excel Sheets into an Excel FileGoal: Build a loop that will create an Excel file with separate Excel sheets for the records of different products. - Read the table CurrentDetailData.table (Table Reader node) - Start a loop that handles the records for the different products in separate iterations (Group Loop Start node) - For each product write one Excel sheet into a single Excel file (Excel Writer node) Tip: Control the flow variable sheet_name in the Flow Variable tab by using a flow variable created by the Group Loop Start node - Close and execute the loop (Variable Loop End node) Activity II: Concatenate Multiple Excel SheetsGoal: Create a loop that reads and concatenates all the sheets in an Excel file. - Create a table that contains all sheet names (Read Excel Sheet Names node) - Start a loop that iterates over the sheet names (Table Row to Variable Loop Start node) - Read the Excel sheet with the sheet name in the current iteration (Excel Reader node) Tip: Use the flow variable created by the Table Row to Variable Loop node to control the setting sheet_name in the Flow Variable tab - Close the loop and concatenate the tables from the different iterations (Loop End node) Table Reader Image To Table Image To Table Scatter Plot Bar Chart Activity III: CASE Switch Extend the workflow below with a switch that only creates one type of visualization. - Create a Single Selection Configuration node with the possible values "scatter" and "bar" - Use the CASE Switch Data (Start) that activates the top/middle branch depending on the selection scatter/bar (Use the "...(index)" flow variable to define the activeport)- Combine the outputs of the two branches with the CASE Switch Data (End) node Activity I: Write Multiple Excel Sheets into an Excel FileGoal: Build a loop that will create an Excel file with separate Excel sheets for the records of different products. - Read the table CurrentDetailData.table (Table Reader node) - Start a loop that handles the records for the different products in separate iterations (Group Loop Start node) - For each product write one Excel sheet into a single Excel file (Excel Writer node) Tip: Control the flow variable sheet_name in the Flow Variable tab by using a flow variable created by the Group Loop Start node - Close and execute the loop (Variable Loop End node) Activity II: Concatenate Multiple Excel SheetsGoal: Create a loop that reads and concatenates all the sheets in an Excel file. - Create a table that contains all sheet names (Read Excel Sheet Names node) - Start a loop that iterates over the sheet names (Table Row to Variable Loop Start node) - Read the Excel sheet with the sheet name in the current iteration (Excel Reader node) Tip: Use the flow variable created by the Table Row to Variable Loop node to control the setting sheet_name in the Flow Variable tab - Close the loop and concatenate the tables from the different iterations (Loop End node) Table Reader Image To Table Image To Table Scatter Plot Bar Chart

Nodes

Extensions

Links

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To use this workflow in KNIME, download it from the below URL and open it in KNIME:

Download Workflow
Created by: knime
Created at: 2014-06-17
On NodePit since: 2021-11-16
Last update: 2024-11-18
Created with KNIME version: v4.4.2
Tags: loopreading many filesswitchalternative branchworkflow controleducation

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