How to use pre-mapping process operator

Hi,
I am using OWB version 10.1.0.4.0.
There are two source tables namely src1_tb(id1,field1,field2), src2_tb(id2,field3,field4) and a target table namely target_tb(id1,id2,field1,field2,field3,field4).
It's a simple mapping with a join operator. Here, when I try to use a pre-mapping process operator 'LENGTH', with input from outgroup of join operator (field1) and output linked to an added field( VALUE_LENGTH) in Traget Table, it gives error "VLD-2451: Connection to premapping is invalid" and a warning "VLD-1008 :Referenced mapping column VALUE_LENGTH" does not exist"
Can anyone please let me know how to use pre-mapping process operator.
Any help will be greatly appreciated.
Regards,
Pawan

yes, a pre-mapping procedure is not what you want here.
Pre-mapping procedures run once when the mapping initializes and before the actual ETL is run. IT is a place where you could do some custom data cleansing / validation, populate your own audit loggin tables if you wish, or whatever other things you might like to do.
For what you are describing, you want to pass the field through an expression object. Drop the Expression on the canvas and drag a link from the field in your OUTGRP to the INGRP on the expression This will auto-create the corresponding ingrp attribute in the expression for that field. Then double-click the expression object to bring up it's properties sheet. You will then want to create an OUTGRP attribute called length_value of type number, and set it's Expression property to length(ingrp1.your_Field_name_here). You can then connect from this outgrp field to your field in the target table.
Cheers,
Mike

Similar Messages

Problem using pre-mapping process operator in owb 9i

Hi,
I was trying to use the pre-mapping process operator in owb 9i. Problem is that the manual does not specify how the inputs need to be connected to this operator. Following is what I went through -
I created a mapping table operator and a mapping dimension operator and connected these two. Then i created a pre-mapping process operator selecting the LTRIM function. Further I connected one of the table attributes to this pre-mapping operator as input and connected the output of this pre-mapping operator to the appropriate dimension operator attribute. On performing Validate, following error message was flashed -
VLD-2451 : Illegal connection to pre-mapping process operator
I am trying to learn how to use OWB 9i from the manual. So my interpretation of the use of the pre-mapping process operator may be wrong.
In any case kindly help,
Thanks
Saju

Pre-mapping process is use to perform some operations preceding to mapping operation itself.
For example, if your mapping is designed to incrementally append data to table for the definite time interval (witch is a parameter of the map operation) you might want to perform the table data cleanup for that period. That will allow for reload data number of time.
In this case you have to define the procedure witch perform cleanup and than include the call to that procedure as a pre-mapping process.
Other examples of pre- and post mapping process is disabling referential integrity before loading and re-enabling them after loading.
Anyway, OWB documentation has clear definition for pre- and post-mapping processes.

Pre-Mapping Process Operator

We are not getting any documentation, how to use Pre-Mapping Process Operator(I went through the help documentation and tried to apply whatever is there).
I am using this operator for a function that returns single value. The output of this operator I want to load into the Expression input and expression operator output I want to load into the target table. The output from the Pre-mapping Operator is blank when I am seeing indebugging mode. I am not getting result in execution mode also. Its a simple function that returns number. The function is
FUNCTION Tesppt RETURN NUMBER IS
BEGIN
RETURN 100;
END;
I want to know how Pre-Mapping operator works . When I am using the function in expression it works fine.
I tried out simple mapping to load a table, it did not work out. The code generated is
CREATE OR REPLACE PACKAGE "TEREEES" AS
sql_stmt VARCHAR2(32767);
get_abort BOOLEAN := FALSE;
get_trigger_success BOOLEAN := TRUE;
get_errors NUMBER(22) := 0;
get_status NUMBER(22) := 0;
-- Status variable for Batch cursors
"TEST_PP_St" BOOLEAN;
"PREMAPPING_0_VALUE" NUMBER;
-- Function Main -- Entry point in package "TEREEES"
FUNCTION Main RETURN NUMBER;
END "TEREEES";
CREATE OR REPLACE PACKAGE BODY "TEREEES" AS
-- Function "TEST_PP_Bat"
-- performs batch extraction
-- Returns TRUE on success
-- Returns FALSE on failure
FUNCTION "TEST_PP_Bat" RETURN BOOLEAN IS
BEGIN
EXECUTE IMMEDIATE 'ALTER SESSION ENABLE PARALLEL DML';
BEGIN
INSERT
/*+ APPEND PARALLEL(TEST_PP, DEFAULT, DEFAULT) */
INTO
"TEST_PP"
("C1",
"C2")
(SELECT
"TEST_COUNTRY"."CODE" "CODE",
"PREMAPPING_0_VALUE" "VALUE"
FROM "TEST_COUNTRY" "TEST_COUNTRY"
COMMIT;
EXCEPTION WHEN OTHERS THEN
ROLLBACK;
COMMIT;
RETURN FALSE;
END;
COMMIT;
RETURN TRUE;
END "TEST_PP_Bat";
FUNCTION Main RETURN NUMBER IS
get_batch_status BOOLEAN := TRUE;
BEGIN
-- Pre-Model Triggers
BEGIN
"PREMAPPING_0_VALUE" :=TESPPT();
EXCEPTION WHEN OTHERS THEN
get_trigger_success := FALSE;
END;
-- Initialize all batch status variables
"TEST_PP_St" := FALSE;
IF get_trigger_success THEN
"TEST_PP_St" := "TEST_PP_Bat";
END IF;
RETURN get_status;
END Main;
END "TEREEES";
Thanks in advance.

We are having one table which will be populated from other source. It will have one value and we need to fetch that value and this value will be constant for the the whole mapping as there is only one record. So, this the reason why we wanted to do this process before the start of the mapping. The code that I have pasted is sample that I did as an trial for testing how pre mapping process operator works.
Actually we are using expression and in expression for every record, we don't want to call a function. We want to call function once only so thats the reason why we are using Pre-Mapping Process operator. I don't think that there is anything better than this but the function returns no value when we are using the Pre-Mapping process operator but when I use this function in the outgroup of the expression it returns the value.
I wanted to see how Pre-mapping operator works, so we tried out simple mapping with simple function but did not work there also. This simple mapping code is there in the query that I asked first.
Thanks in Advance

Problems with pre-mapping process operator in owb 9i

Hi,
I was trying to use the pre-mapping process operator in owb 9i. Problem is that the manual does not specify how the inputs need to be connected to this operator.
Following is what I went through -
I created a mapping table operator and a mapping dimension operator and connected these two. Then i created a pre-mapping process operator selecting the LTRIM function. Further I connected one of the table attributes to this pre-mapping operator as input and connected the output of this pre-mapping operator to the appropriate dimension operator attribute.
On performing Validate, following error message was flashed -
VLD-2451 : Illegal connection to pre-mapping process operator
I am trying to learn how to use OWB 9i from the manual. So my interpretation of the use of the pre-mapping process operator may be wrong.
In any case kindly help,
Thanks,
Saju

Pre-mapping process is use to perform some operations preceding to mapping operation itself.
For example, if your mapping is designed to incrementally append data to table for the definite time interval (witch is a parameter of the map operation) you might want to perform the table data cleanup for that period. That will allow for reload data number of time.
In this case you have to define the procedure witch perform cleanup and than include the call to that procedure as a pre-mapping process.
Other examples of pre- and post mapping process is disabling referential integrity before loading and re-enabling them after loading.
Anyway, OWB documentation has clear definition for pre- and post-mapping processes.

Using Pre-Mapping Process

Hi,
Can you please let me know how to use the pre-defined WB_DISABLE_ALL_CONSTRAINTS(p_table) function.
Do we have any link of the demo.
I followed the users guide ,but could not replicate that.
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Vinay

The OWB Transformation Guide shows usage, purpose and example of each transformation. Here is the place for WB_DISABLE_ALL_CONSTRAINTS http://download-west.oracle.com/docs/html/B12151_01/sqltrans03.htm#sthref261
Nikolai Rochnik

Problems with pre-mapping process in owb 9i

Hi,
I was trying to use the pre-mapping process operator in owb 9i. Problem is that the manual does not specify how the inputs need to be connected to this operator.
Following is what I went through -
I created a mapping table operator and a mapping dimension operator and connected these two. Then i created a pre-mapping process operator selecting the LTRIM function. Further I connected one of the table attributes to this pre-mapping operator as input and connected the output of this pre-mapping operator to the appropriate dimension operator attribute.
On performing Validate, following error message was flashed -
VLD-2451 : Illegal connection to pre-mapping process operator
I am trying to learn how to use OWB 9i from the manual. So my interpretation of the use of the pre-mapping process operator may be wrong.
In any case kindly help,
Thanks,
Saju

Hi,
Essentially the pre (and post) mapping processes are executed before and after the mapping logic. These are separate procedures in the generated package and are "stand alone" from the main package procedure holding the actual mapping diagram.
If you want to use LTRIM, there are 2 supported ways:
1) use an expression, this means you feed the column you want to do the expression on into the expression operator, open the code editor and select from the transformations (or type ltrim......) and then link the result to the target object
2) use a transformation operator, choose ltrim from the Oracle library and connect the operator as I stated in use case 1
We do not encourage you to use a filter to do transformations, it is better to use the operators that are intended for transformations.
Thanks,
Jean-Pierre

Truncate tables in pre-mapping process

I am using OWB 9.0.4 and I have 10 staging area tables that I will be loading in one mapping. I want to truncate all of these tables before I load them. I can not use the TRUNCATE/INSERT option on the target tables because each table will be loaded from two different source tables and I can't specify order in the mapping so I can't have one TRUNCATE/INSERT and the other just INSERT. I would prefer not to have two mappings. I have also tried doing a union on the two source tables but this was not working out well. If I use a pre-mapping operator and select the WB_TRUNCATE_TABLE function, how do I specify multiple tables?
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Hi
Following weblog might help you.
Testing ABAP Mapping - Testing ABAP Mapping
XML DOM Processing in ABAP part I - Convert an ABAP table into XML file using SAP DOM Approach.
/people/r.eijpe/blog/2006/02/19/xml-dom-processing-in-abap-part-iiia150-xml-dom-within-sap-xi-abap-mapping
SDN TV demo to create and test ABAP mapiing - https://media.sdn.sap.com/SDNTV/main.asp?mediaId=128
How to guide for ABAP mapping.
https://websmp106.sap-ag.de/~form/sapnet?_SHORTKEY=01200252310000071155&
Also check these links,
http://help.sap.com/saphelp_nw04/helpdata/en/ba/e18b1a0fc14f1faf884ae50cece51b/content.htm
Testing ABAP Mapping
Using ABAP XSLT Extensions for XI Mapping
Thanks
Gaurav
Edited by: Gaurav Bhargava on Oct 9, 2008 6:27 AM

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OWB 11.2.0.2 on Oracle database 11.2.0.2
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