ABAP Select data from SAP table HUWM_INITIAL_LOAD_HEADER into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP HUWM_INITIAL_LOAD_HEADER 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 HUWM_INITIAL_LOAD_HEADER. 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 HUWM_INITIAL_LOAD_HEADER 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_HUWM_INITIAL_LOAD_HEADER TYPE STANDARD TABLE OF HUWM_INITIAL_LOAD_HEADER,
      WA_HUWM_INITIAL_LOAD_HEADER TYPE HUWM_INITIAL_LOAD_HEADER,
      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: <HUWM_INITIAL_LOAD_HEADER> TYPE HUWM_INITIAL_LOAD_HEADER.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM HUWM_INITIAL_LOAD_HEADER
*  INTO TABLE @DATA(IT_HUWM_INITIAL_LOAD_HEADER2).
*--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_HUWM_INITIAL_LOAD_HEADER INDEX 1 INTO DATA(WA_HUWM_INITIAL_LOAD_HEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<HUWM_INITIAL_LOAD_HEADER>-EXIDA = 1.
<HUWM_INITIAL_LOAD_HEADER>-VHILM = 1.
<HUWM_INITIAL_LOAD_HEADER>-EXIDV2 = 1.
<HUWM_INITIAL_LOAD_HEADER>-BWLVS = 1.
<HUWM_INITIAL_LOAD_HEADER>-SQUIT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_HUWM_INITIAL_LOAD_HEADER-LGNUM, sy-vline,
  WA_HUWM_INITIAL_LOAD_HEADER-TARAG, sy-vline,
  WA_HUWM_INITIAL_LOAD_HEADER-GEWEI, sy-vline,
  WA_HUWM_INITIAL_LOAD_HEADER-MAGEW, sy-vline,
  WA_HUWM_INITIAL_LOAD_HEADER-NTGEW, sy-vline,
  WA_HUWM_INITIAL_LOAD_HEADER-BRGEW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_HUWM_INITIAL_LOAD_HEADER 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_HUWM_INITIAL_LOAD_HEADER 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_HUWM_INITIAL_LOAD_HEADER INTO WA_HUWM_INITIAL_LOAD_HEADER.


*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.

*Conversion exit MATN1, internal->external for field VHILM
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_HUWM_INITIAL_LOAD_HEADER-VHILM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HUWM_INITIAL_LOAD_HEADER-VHILM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EXIDV2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_HUWM_INITIAL_LOAD_HEADER-EXIDV2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HUWM_INITIAL_LOAD_HEADER-EXIDV2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_HUWM_INITIAL_LOAD_HEADER-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HUWM_INITIAL_LOAD_HEADER-GEWEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GEWEI_MAX
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_HUWM_INITIAL_LOAD_HEADER-GEWEI_MAX
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HUWM_INITIAL_LOAD_HEADER-GEWEI_MAX.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VOLEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_HUWM_INITIAL_LOAD_HEADER-VOLEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HUWM_INITIAL_LOAD_HEADER-VOLEH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VOLEH_MAX
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_HUWM_INITIAL_LOAD_HEADER-VOLEH_MAX
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HUWM_INITIAL_LOAD_HEADER-VOLEH_MAX.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEABM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_HUWM_INITIAL_LOAD_HEADER-MEABM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HUWM_INITIAL_LOAD_HEADER-MEABM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit VHUPI, internal->external for field PACKVORSCH
CALL FUNCTION 'CONVERSION_EXIT_VHUPI_OUTPUT'
  EXPORTING
    input =                      WA_HUWM_INITIAL_LOAD_HEADER-PACKVORSCH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HUWM_INITIAL_LOAD_HEADER-PACKVORSCH.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

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

TYPES: BEGIN OF T_HUWM_INITIAL_LOAD_HEADER_STR, 
EXIDA TYPE STRING,
VHILM TYPE STRING,
EXIDV2 TYPE STRING,
BWLVS TYPE STRING,
SQUIT TYPE STRING,
LGNUM TYPE STRING,
TARAG TYPE STRING,
GEWEI TYPE STRING,
MAGEW TYPE STRING,
NTGEW TYPE STRING,
BRGEW TYPE STRING,
GEWEI_MAX TYPE STRING,
GEWTO TYPE STRING,
TAVOL TYPE STRING,
VOLEH TYPE STRING,
MAVOL TYPE STRING,
NTVOL TYPE STRING,
BTVOL TYPE STRING,
VOLEH_MAX TYPE STRING,
GEWFX TYPE STRING,
LAENG TYPE STRING,
BREIT TYPE STRING,
HOEHE TYPE STRING,
MEABM TYPE STRING,
LETYP TYPE STRING,
NLTYP TYPE STRING,
NLBER TYPE STRING,
NLPLA TYPE STRING,
INHALT TYPE STRING,
ERLKZ TYPE STRING,
SORTL TYPE STRING,
VEGR1 TYPE STRING,
VEGR2 TYPE STRING,
VEGR3 TYPE STRING,
VEGR4 TYPE STRING,
VEGR5 TYPE STRING,
PACKVORSCH TYPE STRING,
PACKVORSCHR_ST TYPE STRING,
LABELTYP TYPE STRING,
ZUL_AUFL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_HUWM_INITIAL_LOAD_HEADER_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_HUWM_INITIAL_LOAD_HEADER_STR-EXIDA sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-VHILM sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-EXIDV2 sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-BWLVS sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-SQUIT sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-LGNUM sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-TARAG sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-GEWEI sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-MAGEW sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-NTGEW sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-BRGEW sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-GEWEI_MAX sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-GEWTO sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-TAVOL sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-VOLEH sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-MAVOL sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-NTVOL sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-BTVOL sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-VOLEH_MAX sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-GEWFX sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-LAENG sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-BREIT sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-HOEHE sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-MEABM sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-LETYP sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-NLTYP sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-NLBER sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-NLPLA sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-INHALT sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-ERLKZ sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-SORTL sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-VEGR1 sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-VEGR2 sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-VEGR3 sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-VEGR4 sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-VEGR5 sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-PACKVORSCH sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-PACKVORSCHR_ST sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-LABELTYP sy-vline 
WA_HUWM_INITIAL_LOAD_HEADER_STR-ZUL_AUFL sy-vline      INTO ld_text SEPARATED BY SPACE.

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