02_lab_creating a simple mapping
TRANSCRIPT
-
7/30/2019 02_Lab_Creating a Simple Mapping
1/14
BANGALORE TECHNICAL
TRAININGS
+917411642061
Lab 2
Creating a Mapping
Lab at a Glance................................................................2
Objectives..............................................................2Duration.................................................................2
Exercises.........................................................................3
Exercise 1: Create a Mapping................................3
PowerCenter 9.x Level I Developer Lab Guide
[email protected] 2 - 1
mailto:[email protected]:[email protected] -
7/30/2019 02_Lab_Creating a Simple Mapping
2/14
Lab 2. Creating a Mapping
Lab at a Glance
The exercises in this lab are designed to familiarize the student
with the process of creating a mapping. The student will alsolearn to navigate within the Mapping Designer tool.
Objectives
After completing the lab, the student will be able to:
Open the Mapping Designer tool.
Create a new mapping.
Create an expression transformation.
Link sources, transformations, and targets within a
mapping.
Modify and add ports to an expression transformation.
Validate a mapping.
The completed mapping should look like this:
Duration
This lab should take approximately 30 minutes.
2 - 2 PowerCenter 9.x Level I Developer Lab Guide
-
7/30/2019 02_Lab_Creating a Simple Mapping
3/14
Lab 2. Creating a Mapping
Exercises
Exercise 1: Create a Mapping
In this exercise, the student will create a mapping that
represents the data flow between the EMPLOYEE source and the
ODS_EMPLOYEE target.
A mapping represents the dataflow between sources and targets.
The instructions defined in the mapping tell the Informatica
Server how to read, transform and write the data.
Step 1. Open the Mapping Designer tool.
In the Navigator window, select the Studentxx folder(where xx is your assigned student number).
Select Tools | Mapping Designer, or click the Mapping
Designer button in the toolbar.
Step 2. Create a new mapping.
Select Mappings | Create.
The Mapping Name dialog box appears.
Enterm_ODS_EMPLOYEE_xx for the New Mapping name
(where xx is the assigned student number):
Click the OKbutton.
PowerCenter 9.x Level I Developer Lab Guide 2 - 3
-
7/30/2019 02_Lab_Creating a Simple Mapping
4/14
Lab 2. Creating a Mapping
Step 3. Add source and target definitions.
2 - 4 PowerCenter 9.x Level I Developer Lab Guide
-
7/30/2019 02_Lab_Creating a Simple Mapping
5/14
Lab 2. Creating a Mapping
In the Navigator window, expand the Sources and
odbc_source nodes and locate the EMPLOYEE source
definition:
Drag-and-drop the EMPLOYEE source definition to the far
left side of the workspace.
In the Navigator window, expand the Targets node andlocate the ODS_EMPLOYEEtarget definition:
Drag-and-drop the ODS_EMPLOYEE target definition to the
far right side of the workspace.
The workspace should look as follows:
PowerCenter 9.x Level I Developer Lab Guide 2 - 5
-
7/30/2019 02_Lab_Creating a Simple Mapping
6/14
Lab 2. Creating a Mapping
Step 4. Rename and examine the source qualifiertransformation.
Note that the Data type field indicates thePowerCenter data type for the field, orport. The Informatica Server translatesnative data types to PowerCenter datatypes before processing. When theinformation is written to a target, it istranslated to the defined database or flatfile data type.
For purposes of this lab, the source qualifier will be
renamed to follow Informatica Velocity best practices.
Edit SQ_EMPLOYEEby double-clicking on the header.The Edit Transformations dialog box appears.
Click the Rename button.
Entersq_EMPLOYEE in the Transformation Name field.
ClickOK.
ClickApply.
Click on the Ports tab to view the port names, datatypes,precisions and scales:
Click the OKbutton to close the dialog box.
Step 5. Create an expression transformation.
Before the target is loaded, theFIRST_NAME and LAST_NAME ports foreach row must be concatenated. Thisconcatenation can be done in anExpression transformation.
If the toolbar is not visible, activate it by
selecting Tools | Customize, thenselect the Transformations checkbox
Before the target is loaded, the FIRST_NAME and LAST_NAME
ports for each row must be concatenated. This concatenation can
be done in an Expression transformation.
Locate the Transformation toolbar.
The default location is at the top of the Designer.
Click on the vertical bar at the beginning of the toolbar
and drag the toolbar to the center of the Designerworkspace.
An alternative is to selectTransformations Create fromthe menu and then choose Expression
Click on the Expression Transformation button in the
toolbar.
2 - 6 PowerCenter 9.x Level I Developer Lab Guide
-
7/30/2019 02_Lab_Creating a Simple Mapping
7/14
Lab 2. Creating a Mapping
as the transformation type. In thismethod, you name the transformation atthe time you create it.
In order to give yourself more room to
work, you may wish to toggle off thenavigator window. You can do this byselecting View Navigator from themenu or by clicking the x in the upper-right corner of the navigator.
Move the pointer in the workspace to the right of the
sq_EMPLOYEE source qualifier. In the workspace, thecursor appears as crosshairs .
Left-click the mouse.
An Expression transformation is created.
PowerCenter 9.x Level I Developer Lab Guide 2 - 7
-
7/30/2019 02_Lab_Creating a Simple Mapping
8/14
Lab 2. Creating a Mapping
Step 6. Link the Source Qualifier to the Expressiontransformation.
2 - 8 PowerCenter 9.x Level I Developer Lab Guide
-
7/30/2019 02_Lab_Creating a Simple Mapping
9/14
Lab 2. Creating a Mapping
Link Columns toggles linking on/off.You must still link the columns, as in thenext step.
Select Layout | Link Columns, or click the Link Columns
button in the toolbar.
In the sq_EMPLOYEEsource qualifier, hold down the Ctrlkey and select the following ports:
EMPLOYEE_ID
FIRST_NAME
LAST_NAME
DATE_HIRED
TYPE_CODE
Drag the ports to an empty line of the expressiontransformation object and release the mouse button.
PowerCenter 9.x Level I Developer Lab Guide 2 - 9
-
7/30/2019 02_Lab_Creating a Simple Mapping
10/14
Lab 2. Creating a Mapping
Step 7. Rename the Expression transformation.
Double-click on the header of the Expression
transformation.
Click the Rename button.
Rename the transformation to exp_ODS_EMPLOYEE.
Step 8. Modify/add ports to the Expressiontransformation.
Select the Ports tab.
Disable the output ports forFIRST_NAME and LAST_NAME
by removing the checkmark in the O (output) column.
This will define the port as input only.
Click on the LAST_NAME column.
Click on the Add button to add a new port.
Name the new port NAME_out.
Verify the data type is string and increase the precision to
51.
Disable the input port forNAME_out by removing thecheckmark in the I (input) column. This will define the
port as output only:
Step 9. Create an expression formula.
Click in the Expression column of the NAME_outport andnotice the arrow that appears at the far right:
2 - 10 PowerCenter 9.x Level I Developer Lab Guide
-
7/30/2019 02_Lab_Creating a Simple Mapping
11/14
Lab 2. Creating a Mapping
Using the || string operator instead ofCONCAT improves Informatica Server
performance in processing the formula.
Note that a formula can also be typed inmanually, if the names of the functionsand ports are known.
Click on the arrow.
The Expression Editor dialog box appears.
Delete the text, NAME_out, in the Formula field.
Select the Ports tab on the left-hand side of theExpression Editor dialog box.
Portstab
Double-click on the port FIRST_NAME. Note that it is
added to the Formula field.
Click on the double-pipe button in the Operator
keypad. The concatenation operator is added to theformula.
Click on the single-quote button.
Press the spacebar once and click the single-quote button
again. This will cause a space to be placed after the
FIRST_NAME in the formula.
Click on the double-pipe button again.
Double-click on LAST_NAME. The concatenation formulais complete, and should look like this:
FIRST_NAME||''||LAST_NAME
ClickValidate.
Upon successful parsing of the formula, the Expressionparsed successfully message will appear.
ClickOK.
PowerCenter 9.x Level I Developer Lab Guide 2 - 11
-
7/30/2019 02_Lab_Creating a Simple Mapping
12/14
Lab 2. Creating a Mapping
ClickOK to close the Edit Transformation dialog box.
Save the repository.
Step 10. Link the target definition.
Click on the following ports in exp_ODS_EMPLOYEE anddrag them onto ODS_EMPLOYEE to link the ports:
EMPLOYEE_ID EMPLOYEE_ID
NAME_out NAME
DATE_HIRED DATE_HIRED
TYPE_CODE TYPE_CODE
The mapping is now complete. Right-click in the
workspace and select Arrange All the mapping shouldlook like the following:
Step 11. Validate the mapping.
Save the repository.
Every time a repository is saved, mapping validation
checks are performed.
Click on the Save tab in the Output window.
Expand the Output window and scroll up until the
validation test details are visible:
2 - 12 PowerCenter 9.x Level I Developer Lab Guide
-
7/30/2019 02_Lab_Creating a Simple Mapping
13/14
Lab 2. Creating a Mapping
Verify that there are no errors.
Step 12. Correct any errors
If the validation results are INVALID:
Locate the last date/time stamp (when the repository was
saved).
Locate the first error.
Note that there may be more than one error it is best tofind and correct the first error, as it may have caused
further errors.
Correct the error and save the repository, or selectMappings | Validate.
Check the results in the Output windows Validate tab:
PowerCenter 9.x Level I Developer Lab Guide 2 - 13
-
7/30/2019 02_Lab_Creating a Simple Mapping
14/14
Lab 2. Creating a Mapping
Save the repository.