How to Loop at an Internal Table in SAP BW/4HANA Using AMDP Code

Internal tables are data objects that store multiple records of the same structure in memory. Internal tables are often used in SAP BW/4HANA to store and process intermediate or final results of data transformations, such as lookups, calculations, aggregations, etc.

However, sometimes you may need to loop at an internal table to perform some operations on each record, such as filtering, modifying, aggregating, etc. For example, you may want to loop at an internal table to check some conditions or calculate some values based on the record fields.

In this blog post, we will show you how to loop at an internal table in SAP BW/4HANA data loads using AMDP code. AMDP stands for ABAP Managed Database Procedures, which are database procedures written in ABAP and executed on the SAP HANA database. AMDP code can help you process and transform data faster and more efficiently than ABAP code.

Why Use AMDP Code for Looping at an Internal Table?

There are several reasons why you may want to use AMDP code for looping at an internal table in SAP BW/4HANA data loads:

AMDP code can run directly on the SAP HANA database, which means it can leverage the parallel processing and in-memory capabilities of SAP HANA. This can improve the performance and scalability of your data loads.
AMDP code can access and manipulate data from different sources and targets, such as tables, views, InfoObjects, etc. This can give you more flexibility and control over your data transformations.
AMDP code can use SQLScript, which is a scripting language for SAP HANA that supports advanced features such as loops, variables, expressions, etc. This can make your code more readable and maintainable.

How to Use AMDP Code for Looping at an Internal Table?

To use AMDP code for looping at an internal table in SAP BW/4HANA data loads, you need to follow these steps:

Create an AMDP class and method that contains the logic for looping at an internal table. You can use the example code below as a reference. The code uses the FOR loop statement to iterate over each record of the internal table. It also uses a local variable to store the record value and perform some operations on it.

class zcl_loop_itab_01 definition   public   final   create public .
  public section.
  interfaces if_amdp_marker_hdb.
  CLASS-methods LOOP_ITAB importing VALUE (IT_ITAB) TYPE any table   exporting VALUE (ET_ITAB) TYPE any table.
  protected section.
  private section.
endclass.

class zcl_loop_itab_01 implementation.
  method LOOP_ITAB by database procedure   for hdb   language sqlscript.
    declare lv_record like line of :IT_ITAB;
    declare lv_count integer := 0;
    -- Loop over each record of the internal table
    FOR lv_record IN SELECT * FROM :IT_ITAB DO
      -- Do some operations on the record value
      -- For example, increment a counter
      lv_count := :lv_count + 1;
      -- Modify the record value if needed
      -- For example, add the counter value to a field
      lv_record-ZFIELD := :lv_record-ZFIELD + :lv_count;
      -- Insert the modified record into the output internal table
      INSERT INTO :ET_ITAB VALUES (:lv_record);
    END FOR;
  endmethod.
endclass.

class zcl_loop_itab_01 definition public final create public .

public section.

interfaces if_amdp_marker_hdb.

CLASS-methods LOOP_ITAB importing VALUE (IT_ITAB) TYPE any table exporting VALUE (ET_ITAB) TYPE any table.

protected section.

private section.

endclass.

class zcl_loop_itab_01 implementation.

method LOOP_ITAB by database procedure for hdb language sqlscript.

declare lv_record like line of :IT_ITAB;

declare lv_count integer := 0;

-- Loop over each record of the internal table

FOR lv_record IN SELECT * FROM :IT_ITAB DO

-- Do some operations on the record value

-- For example, increment a counter

lv_count := :lv_count + 1;

-- Modify the record value if needed

-- For example, add the counter value to a field

lv_record-ZFIELD := :lv_record-ZFIELD + :lv_count;

-- Insert the modified record into the output internal table

INSERT INTO :ET_ITAB VALUES (:lv_record);

END FOR;

endmethod.

endclass.

Create a transformation that uses the AMDP class and method for looping at an internal table. You can use the transformation editor in SAP BW/4HANA to create a transformation between your source and target objects. In the transformation, you need to call the AMDP method with the appropriate parameters. You can use the example code below as a reference. The code passes an internal table as a parameter to the AMDP method and assigns the output value to another internal table.

METHOD START_ROUTINE.
  DATA: lt_itab TYPE STANDARD TABLE OF _ty_s_TG_1,
        lt_result LIKE lt_itab.
  "Fill the input internal table with some data
ENDMETHOD.

METHOD END_ROUTINE.
  CALL METHOD zcl_loop_itab_01=>LOOP_ITAB
    EXPORTING
      IT_ITAB   = lt_itab
    IMPORTING
      ET_ITAB   = lt_result.
  IF sy-subrc <> 0.
    "Handle the exception
  ENDIF.
  "Do something with the result internal table
ENDMETHOD.

METHOD START_ROUTINE.

DATA: lt_itab TYPE STANDARD TABLE OF _ty_s_TG_1,

lt_result LIKE lt_itab.

"Fill the input internal table with some data

ENDMETHOD.

METHOD END_ROUTINE.

CALL METHOD zcl_loop_itab_01=>LOOP_ITAB

EXPORTING

IT_ITAB = lt_itab

IMPORTING

ET_ITAB = lt_result.

IF sy-subrc <> 0.

"Handle the exception

ENDIF.

"Do something with the result internal table

ENDMETHOD.

Execute the data load and check the results. You can use the InfoPackage or the Data Transfer Process (DTP) to execute the data load from your source object to your target object. You can also monitor the data load status and logs in SAP BW/4HANA. After the data load is completed, you can check the results in your internal table and verify that the data is looped and modified correctly.

Conclusion

In this blog post, we have shown you how to loop at an internal table in SAP BW/4HANA data loads using AMDP code. AMDP code can help you improve the performance, flexibility, and readability of your data transformations. We hope you find this blog post useful and informative. If you have any questions or feedback, please feel free to leave a comment below.

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