An unconnected Lookup transformation is separate from the pipeline in the mapping. We write an expression using the :LKP reference qualifier to call the lookup within another transformation.
Steps to configure Unconnected Lookup:
Example for create a unconnected Lookup Transformation
Steps to configure Unconnected Lookup:
- Add input ports.
- Add the lookup condition.
- Designate a return value.
- Call the lookup from another transformation.
Example for create a unconnected Lookup Transformation
- Let us assume EMP will be source table and DEPT will be LOOKUP table.
- Create a target table T_UNCONN_LKP in target designer. Table should contain all ports of EMP table plus LOC.
- Go to the Mapping Designer.
- Click Mapping-> Create-> Give name. Ex: m_UNCONN_LKP
- Drag Source and Target table.
- Creat an EXPRESSION transformation and pass all ports from Source Qualifier to EXPRESSION transformation.
- Then connect all fields from EXPRESSION to target except DNAME.
- Create a LOOKUP transformation.
- As DEPT is the Source definition, click Source and then Select DEPT.
- Click Ok.
- Now Edit the Lookup Transformation. Go to Ports tab.
- As DEPTNO is common in source and Lookup, create a port IN_DEPTNO ports tab. Make it Input port only and Give Datatype same as DEPTNO.
- Designate LOC as Return Port. Check on R to make it.
- Now add a condition in Condition Tab.
- DEPTNO = IN_DEPTNO and Click Apply and then OK.
- Now we need to call this Lookup from Expression Transformation.
- Edit Expression transformation and create a new output port out_LOC of datatype as LOC.
- Open the Expression editor and call Lookup as given below:
- We double click Unconn in bottom of Functions tab and as we need only DEPTNO, we pass only DEPTNO as input.
- Write the expression as :LKP.LKPTRANS(DeptNo)
- The final mapping looks like as below..
- Validate the call in Expression editor and Click OK.
- Then save the mapping.
- Create Session and Workflow. Run the workflow and see the data in target table.
- Note:
- Make sure to give connection information for all tables.
- Make sure to give connection for LOOKUP Table also.
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