Friday, March 22, 2013

Filter Transformation

The Filter Transformation is Active and Connected Transformation.

Filter: The Filter transformation to filter out rows in a mapping which are passing through it. The Filter transformation allows rows that meet the specified filter condition to pass through. It drops rows that do not meet the condition. You can filter data based on one or more conditions.

A filter condition may returns TRUE or FALSE for each row that the Integration Service evaluates, depending on the specified condition. For each row that returns TRUE can pass through the transformation. For each row that returns FALSE will be dropped out and writes a message to the session log.

Sample Mapping:

1. Connect and Open the folder if not already opened.
2. Select Tools --> Mapping Designer

3. Select Mappings --> Create

It will pop-up "Mapping Name". Enter the mapping name of your choice" and Click on 'OK'. Example: m_emp_dept_filter

4. Drag the Source and Target definitions into workspace if they are already exist. If not click here to know how to create or import Tabledefinitions.

5. Select 'Transformation' from Menu --> Create

a)    That will appear you 'Select the transformation type to create:'

b) Select 'Filter' from drop down and 'Enter a new name for this transformation:' as "Fil_Emp_Dept"
c)   Click 'Create' and 'Done'
or

a)    Click on Filter Transformation icon marked below in below snapshot.

b)    Click in the workspace in Mapping Designer.

c)    Select FILTRANS in workspace and Right Click --> Edit.

d)    In Transformation tab --> Click on 'Rename' highlighted above which will pop-up 'Rename Transformation'. Enter the Transformation Name: "Fil_Emp_Dept"
e)    Click on 'OK'
f)    Click on 'Apply' and 'OK'.

6). Drag all the ports from 'SQ_EMP' Source Qualifier to 'Fil_Emp_Dept' Filter Transformation.

7) Select 'Fil_Emp_Dept' Filter Transformation and right click --> Edit --> Properties Tab.

 a)    Click on 'Open Button' highlighted above which will appear 'Expression Editor'.
                   ex: Enter the Filter Condition: SAL > 2000
b)    Click on 'Validate' to validate the function and Click on 'OK'.
c)    Click on 'Apply' and 'OK'.

8). Drag the Port from 'Fil_Emp_Dept' filter transformation to 'EMP1' target instance.

9) Select 'Mapping' from Menu --> Validate.

10) Select 'Repository' from Menu --> Save.


Tips:
  1. Place the Filter transformation as close to the sources in the mapping as possible to maximize session performance. Rather than passing rows you plan to discard through the mapping, you can filter out unwanted data early in the flow of data from sources to targets.
  2. The filter condition is case sensitive.
  3. To maximize session performance, keep the Filter transformation as close as possible to the sources in the mapping. Rather than passing rows that you plan to discard through the mapping, you can filter out unwanted data early in the flow of data from sources to targets.
  4. The Source Qualifier transformation provides an alternate way to filter rows. Rather than filtering rows from within a mapping, the Source Qualifier transformation filters rows when read from a source.

3 comments:

  1. Excellent example of a simple Filter Transaction. Thank you. J.Finn.

    ReplyDelete
  2. Hi,
    Please include that we need to add the port name under port which has similar data types of Source. Please correct me if I am wrong

    ReplyDelete