ABAP Select data from SAP table HUMSEG_HU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM HUMSEG_HU
*  INTO TABLE @DATA(IT_HUMSEG_HU2).
*--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_HUMSEG_HU INDEX 1 INTO DATA(WA_HUMSEG_HU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<HUMSEG_HU>-VENUM = 1.
<HUMSEG_HU>-VEPOS = 1.
<HUMSEG_HU>-IMSEG_TABIX = 1.
<HUMSEG_HU>-EXIDV_OB = 1.
<HUMSEG_HU>-HU_LGORT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_HUMSEG_HU-HU_VHART, sy-vline,
  WA_HUMSEG_HU-QUANTITY, sy-vline,
  WA_HUMSEG_HU-VEMEH, sy-vline,
  WA_HUMSEG_HU-MATNR, sy-vline,
  WA_HUMSEG_HU-CHARG, sy-vline,
  WA_HUMSEG_HU-WERKS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_HUMSEG_HU 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_HUMSEG_HU 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_HUMSEG_HU INTO WA_HUMSEG_HU.


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

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

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

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

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

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

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

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

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

*Conversion exit CUNIT, internal->external for field /CWM/VEMEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_HUMSEG_HU-/CWM/VEMEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HUMSEG_HU-/CWM/VEMEH.
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_HUMSEG_HU_STR, 
VENUM TYPE STRING,
VEPOS TYPE STRING,
IMSEG_TABIX TYPE STRING,
EXIDV_OB TYPE STRING,
HU_LGORT TYPE STRING,
HU_VHART TYPE STRING,
QUANTITY TYPE STRING,
VEMEH TYPE STRING,
MATNR TYPE STRING,
CHARG TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
BESTQ TYPE STRING,
SOBKZ TYPE STRING,
SONUM TYPE STRING,
LGNUM TYPE STRING,
LGTYP TYPE STRING,
LGPLA TYPE STRING,
LEIT TYPE STRING,
L_TRANSIT TYPE STRING,
N_MATNR TYPE STRING,
N_CHARG TYPE STRING,
N_WERKS TYPE STRING,
N_LGORT TYPE STRING,
N_BESTQ TYPE STRING,
N_SOBKZ TYPE STRING,
N_SONUM TYPE STRING,
N_LGNUM TYPE STRING,
N_LGTYP TYPE STRING,
N_LGPLA TYPE STRING,
GEGEN TYPE STRING,
G_TRANSIT TYPE STRING,
WDATU TYPE STRING,
VFDAT TYPE STRING,
OPMNG TYPE STRING,
MOVEMENT_TYPE TYPE STRING,
UNPACK TYPE STRING,
HU_SYSTEM TYPE STRING,
QPLOS TYPE STRING,
ZEUGN TYPE STRING,
LETYP TYPE STRING,
ATTRIBUTE TYPE STRING,
SGT_SCAT TYPE STRING,
SGT_UMSCAT TYPE STRING,
/CWM/VEMNG TYPE STRING,
/CWM/VEMEH TYPE STRING,
WRF_CHARSTC1 TYPE STRING,
WRF_CHARSTC2 TYPE STRING,
WRF_CHARSTC3 TYPE STRING,
WRF_CHARSTC1_TXT TYPE STRING,
WRF_CHARSTC2_TXT TYPE STRING,
WRF_CHARSTC3_TXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_HUMSEG_HU_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_HUMSEG_HU_STR-VENUM sy-vline 
WA_HUMSEG_HU_STR-VEPOS sy-vline 
WA_HUMSEG_HU_STR-IMSEG_TABIX sy-vline 
WA_HUMSEG_HU_STR-EXIDV_OB sy-vline 
WA_HUMSEG_HU_STR-HU_LGORT sy-vline 
WA_HUMSEG_HU_STR-HU_VHART sy-vline 
WA_HUMSEG_HU_STR-QUANTITY sy-vline 
WA_HUMSEG_HU_STR-VEMEH sy-vline 
WA_HUMSEG_HU_STR-MATNR sy-vline 
WA_HUMSEG_HU_STR-CHARG sy-vline 
WA_HUMSEG_HU_STR-WERKS sy-vline 
WA_HUMSEG_HU_STR-LGORT sy-vline 
WA_HUMSEG_HU_STR-BESTQ sy-vline 
WA_HUMSEG_HU_STR-SOBKZ sy-vline 
WA_HUMSEG_HU_STR-SONUM sy-vline 
WA_HUMSEG_HU_STR-LGNUM sy-vline 
WA_HUMSEG_HU_STR-LGTYP sy-vline 
WA_HUMSEG_HU_STR-LGPLA sy-vline 
WA_HUMSEG_HU_STR-LEIT sy-vline 
WA_HUMSEG_HU_STR-L_TRANSIT sy-vline 
WA_HUMSEG_HU_STR-N_MATNR sy-vline 
WA_HUMSEG_HU_STR-N_CHARG sy-vline 
WA_HUMSEG_HU_STR-N_WERKS sy-vline 
WA_HUMSEG_HU_STR-N_LGORT sy-vline 
WA_HUMSEG_HU_STR-N_BESTQ sy-vline 
WA_HUMSEG_HU_STR-N_SOBKZ sy-vline 
WA_HUMSEG_HU_STR-N_SONUM sy-vline 
WA_HUMSEG_HU_STR-N_LGNUM sy-vline 
WA_HUMSEG_HU_STR-N_LGTYP sy-vline 
WA_HUMSEG_HU_STR-N_LGPLA sy-vline 
WA_HUMSEG_HU_STR-GEGEN sy-vline 
WA_HUMSEG_HU_STR-G_TRANSIT sy-vline 
WA_HUMSEG_HU_STR-WDATU sy-vline 
WA_HUMSEG_HU_STR-VFDAT sy-vline 
WA_HUMSEG_HU_STR-OPMNG sy-vline 
WA_HUMSEG_HU_STR-MOVEMENT_TYPE sy-vline 
WA_HUMSEG_HU_STR-UNPACK sy-vline 
WA_HUMSEG_HU_STR-HU_SYSTEM sy-vline 
WA_HUMSEG_HU_STR-QPLOS sy-vline 
WA_HUMSEG_HU_STR-ZEUGN sy-vline 
WA_HUMSEG_HU_STR-LETYP sy-vline 
WA_HUMSEG_HU_STR-ATTRIBUTE sy-vline 
WA_HUMSEG_HU_STR-SGT_SCAT sy-vline 
WA_HUMSEG_HU_STR-SGT_UMSCAT sy-vline 
WA_HUMSEG_HU_STR-/CWM/VEMNG sy-vline 
WA_HUMSEG_HU_STR-/CWM/VEMEH sy-vline 
WA_HUMSEG_HU_STR-WRF_CHARSTC1 sy-vline 
WA_HUMSEG_HU_STR-WRF_CHARSTC2 sy-vline 
WA_HUMSEG_HU_STR-WRF_CHARSTC3 sy-vline 
WA_HUMSEG_HU_STR-WRF_CHARSTC1_TXT sy-vline 
WA_HUMSEG_HU_STR-WRF_CHARSTC2_TXT sy-vline 
WA_HUMSEG_HU_STR-WRF_CHARSTC3_TXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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