Generating Date Dimension


Create a new job called date_dim. First we will define a variable for start date, because we will use this job in various projects and we might require a different start date each time:

Click on the Context tab and then on the + button to add a new context variable. Give it the name myStartDate of type Date and define a value for it.



Next add a tRowGenerator component to the design area and double click on it to activate the settings dialog. The idea is to create X amount of rows: The first row will hold our start date and each subsequent row will increment the date by one day.


1.       Click the + button to add a new column. Name it date and set the type to Date.
2.       Click in the Environment variables cell on the right hand side and then you will see the parameters displayed in the Function parameters tab on the bottom left hand side.
3.       Define the number of rows that should be generated in Number of Rows for RowGenerator.
4.       In the Function parameters tab set the date parameter value to context.myStartDate. This will ensure that the context variable which we defined earlier will be used.
5.       Set the nb parameter to Numeric. sequence(“s1”, 1, 1) - 1. Use the expression builder for a more convenient setup. This will create a sequence which we will use to add days to our start date. The reason why we subtract 1 at the end is because we want to keep our start date.
6.       Set the dateType parameter value to “dd”. This ensures that days will be added to our date.
7.       Click on the Preview tab and check if the result set looks as expected.
8.       Click Ok to close the component settings.

A.       Now add a tMap component and create a row from the tRowGenerator to the tMap component. Double click the tMap component:

  1. Click the + button on the right hand side to create a new output table.
  2. For year column extract the year using TalendDate.formatDate("yyyy",row1.date)
  3. For Quater details: (Integer.parseInt(TalendDate.formatDate("M",row1.date))+3-1) /  3   
  4. For Month number : TalendDate.formatDate("MM",row1.date)
  5. For Month name : TalendDate.formatDate("MMM",row1.date)
  6. For Weekday number (1-5) : row1.date.getDay()
  7.  For day part of the date (1-31) : row1.date.getDate()
  8. For week of the year(1-52): TalendDate.formatDate("ww",row1.date)
  9. For day of the year(1-366) : TalendDate.formatDate("DDD",row1.date)
  10. Click Ok.
  11. Add a database output component of your choice (in my case I used one for PostgreSQL) and create a row from the tMap to the database output component. Double click the database output component and provide all the necessary settings. That’s it: Now you can run the job and examine the data in your table.

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