ABAP Select data from SAP table OMS_HEAP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP OMS_HEAP table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to OMS_HEAP. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the OMS_HEAP table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_OMS_HEAP TYPE STANDARD TABLE OF OMS_HEAP,
      WA_OMS_HEAP TYPE OMS_HEAP,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <OMS_HEAP> TYPE OMS_HEAP.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_OMS_HEAP.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM OMS_HEAP
  INTO TABLE IT_OMS_HEAP.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OMS_HEAP
*  INTO TABLE @DATA(IT_OMS_HEAP2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_OMS_HEAP INDEX 1 INTO DATA(WA_OMS_HEAP2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_OMS_HEAP ASSIGNING <OMS_HEAP>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<OMS_HEAP>-USE_BYTE = 1.
<OMS_HEAP>-USE_KB = 1.
<OMS_HEAP>-USE_MB = 1.
<OMS_HEAP>-RESERVED = 1.
<OMS_HEAP>-RESERV_KB = 1.

ENDLOOP.

LOOP AT IT_OMS_HEAP INTO WA_OMS_HEAP.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OMS_HEAP-RESERV_MB, sy-vline,
  WA_OMS_HEAP-OMSMALLOC, sy-vline,
  WA_OMS_HEAP-MALLOC_KB, sy-vline,
  WA_OMS_HEAP-MALLOC_MB, sy-vline,
  WA_OMS_HEAP-CHUNK_SIZE, sy-vline,
  WA_OMS_HEAP-CHUNK_KB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_OMS_HEAP you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_OMS_HEAP TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_OMS_HEAP INTO WA_OMS_HEAP.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_OMS_HEAP_STR, 
USE_BYTE TYPE STRING,
USE_KB TYPE STRING,
USE_MB TYPE STRING,
RESERVED TYPE STRING,
RESERV_KB TYPE STRING,
RESERV_MB TYPE STRING,
OMSMALLOC TYPE STRING,
MALLOC_KB TYPE STRING,
MALLOC_MB TYPE STRING,
CHUNK_SIZE TYPE STRING,
CHUNK_KB TYPE STRING,
CHUNK_MB TYPE STRING,
EMER_INUSE TYPE STRING,
INUSE_KB TYPE STRING,
INUSE_MB TYPE STRING,
EMER_MAXUS TYPE STRING,
MAXUS_KB TYPE STRING,
MAXUS_MB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OMS_HEAP_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_OMS_HEAP_STR-USE_BYTE sy-vline 
WA_OMS_HEAP_STR-USE_KB sy-vline 
WA_OMS_HEAP_STR-USE_MB sy-vline 
WA_OMS_HEAP_STR-RESERVED sy-vline 
WA_OMS_HEAP_STR-RESERV_KB sy-vline 
WA_OMS_HEAP_STR-RESERV_MB sy-vline 
WA_OMS_HEAP_STR-OMSMALLOC sy-vline 
WA_OMS_HEAP_STR-MALLOC_KB sy-vline 
WA_OMS_HEAP_STR-MALLOC_MB sy-vline 
WA_OMS_HEAP_STR-CHUNK_SIZE sy-vline 
WA_OMS_HEAP_STR-CHUNK_KB sy-vline 
WA_OMS_HEAP_STR-CHUNK_MB sy-vline 
WA_OMS_HEAP_STR-EMER_INUSE sy-vline 
WA_OMS_HEAP_STR-INUSE_KB sy-vline 
WA_OMS_HEAP_STR-INUSE_MB sy-vline 
WA_OMS_HEAP_STR-EMER_MAXUS sy-vline 
WA_OMS_HEAP_STR-MAXUS_KB sy-vline 
WA_OMS_HEAP_STR-MAXUS_MB sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.