Unconnected Lookup Transformation in Informatica

Passive Transformation

Unlike Connected Transformation that receives input directly from the mapping pipeline, it receives input from the result of an expression in another transformation.

Acts like a function. An actual parameter is passed to the unconnected lookup transformation. A formal parameter captures that value and returns a value.

Lookup Transformation

Create a mapping M_LKP_UNC.

Drag Source (EMP), Target(Dim_JOIN),

From the transformation Menu Create an Expression transformation T_EXP and a lookup transformation T_LKP_UNC.

Lookup Transformation

Project the required ports from SQ to T_EXP and add a new port DNAME in T_EXP. Uncheck the Input port.

Edit the Lookup Transformation and add a new port IN_DEPTNO (Formal parameter). Set the datatype,size and precision same as that of DEPTNO.

Check the input port for IN_DEPTNO and return port for DNAME.

Go to Condition Tab and set the condition DEPTNO = IN_DEPTNO.

Lookup Transformation

In the Expression Transfromation T_EXP, build a formula in the Expression.

Go to Functions Tab, expand Lookup Folder. Double Click on Lookup Function :LKP.T_LKP_UNC().

Lookup Transformation

Go to PORTS tab and pass a parameter by dbl clicking DEPTNO.

:LKP.T_LKP_UNC(DEPTNO).

Lookup Transformation

Project the required ports from the EXP to the TGT.

Lookup Transformation

Define a workflow WKF_LKP_UNC.

Sepecify three connections:

Source

Target

Lookup (Important) .Since it is an unconnected lookup it is compulsory to assign the Relational Source connection MEEN_SRC here ($Source does not work here). Give the lookup table name.

Lookup Transformation

Preview the Output.

Lookup Transformation

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