ABAP Select data from SAP table MC45W_0HDR into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MC45W_0HDR 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 MC45W_0HDR. 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 MC45W_0HDR 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_MC45W_0HDR TYPE STANDARD TABLE OF MC45W_0HDR,
      WA_MC45W_0HDR TYPE MC45W_0HDR,
      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: <MC45W_0HDR> TYPE MC45W_0HDR.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MC45W_0HDR.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MC45W_0HDR
  INTO TABLE IT_MC45W_0HDR.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MC45W_0HDR
*  INTO TABLE @DATA(IT_MC45W_0HDR2).
*--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_MC45W_0HDR INDEX 1 INTO DATA(WA_MC45W_0HDR2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MC45W_0HDR ASSIGNING <MC45W_0HDR>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MC45W_0HDR>-ROCANCEL = 1.
<MC45W_0HDR>-ABART = 1.
<MC45W_0HDR>-AEDAT = 1.
<MC45W_0HDR>-BLDAT = 1.
<MC45W_0HDR>-BRTWR = 1.

ENDLOOP.

LOOP AT IT_MC45W_0HDR INTO WA_MC45W_0HDR.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MC45W_0HDR-BRTWRD, sy-vline,
  WA_MC45W_0HDR-BUKRS, sy-vline,
  WA_MC45W_0HDR-EKGRP, sy-vline,
  WA_MC45W_0HDR-EKORG, sy-vline,
  WA_MC45W_0HDR-ERDAT, sy-vline,
  WA_MC45W_0HDR-ERNAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MC45W_0HDR 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_MC45W_0HDR 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_MC45W_0HDR INTO WA_MC45W_0HDR.


*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 KUNRE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC45W_0HDR-KUNRE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC45W_0HDR-KUNRE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNRG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC45W_0HDR-KUNRG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC45W_0HDR-KUNRG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFRE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC45W_0HDR-LIFRE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC45W_0HDR-LIFRE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LNRZB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC45W_0HDR-LNRZB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC45W_0HDR-LNRZB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC45W_0HDR-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC45W_0HDR-LOGSYS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STAFO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC45W_0HDR-STAFO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC45W_0HDR-STAFO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field WBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC45W_0HDR-WBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC45W_0HDR-WBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field WBELN_RL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC45W_0HDR-WBELN_RL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC45W_0HDR-WBELN_RL.
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_MC45W_0HDR_STR, 
ROCANCEL TYPE STRING,
ABART TYPE STRING,
AEDAT TYPE STRING,
BLDAT TYPE STRING,
BRTWR TYPE STRING,
BRTWRD TYPE STRING,
BUKRS TYPE STRING,
EKGRP TYPE STRING,
EKORG TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
GSKTO TYPE STRING,
GSKTOD TYPE STRING,
HWAER TYPE STRING,
KKBER TYPE STRING,
KUNRE TYPE STRING,
KUNRG TYPE STRING,
KURST TYPE STRING,
LANDL TYPE STRING,
LFART TYPE STRING,
LFART_RL TYPE STRING,
LFGRU TYPE STRING,
LFTYP TYPE STRING,
LIFRE TYPE STRING,
LNRZB TYPE STRING,
LOGSYS TYPE STRING,
MWSBK TYPE STRING,
MWSBKD TYPE STRING,
NETWR TYPE STRING,
NETWRD TYPE STRING,
RFBSK TYPE STRING,
SPART TYPE STRING,
STAFO TYPE STRING,
VKBUR TYPE STRING,
VKGRP TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
WAERL TYPE STRING,
WBELN TYPE STRING,
WBELN_RL TYPE STRING,
WBTYP TYPE STRING,
WDTYP TYPE STRING,
WFDAT TYPE STRING,
WFDAT_RL TYPE STRING,
WRART TYPE STRING,
WRTYP TYPE STRING,
WSTWAE TYPE STRING,
ZEITP TYPE STRING,
PERIV TYPE STRING,
NOHDR TYPE STRING,
ANZVGRL TYPE STRING,
ANZVGLF TYPE STRING,
ANZRG TYPE STRING,
ANZLF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MC45W_0HDR_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_MC45W_0HDR_STR-ROCANCEL sy-vline 
WA_MC45W_0HDR_STR-ABART sy-vline 
WA_MC45W_0HDR_STR-AEDAT sy-vline 
WA_MC45W_0HDR_STR-BLDAT sy-vline 
WA_MC45W_0HDR_STR-BRTWR sy-vline 
WA_MC45W_0HDR_STR-BRTWRD sy-vline 
WA_MC45W_0HDR_STR-BUKRS sy-vline 
WA_MC45W_0HDR_STR-EKGRP sy-vline 
WA_MC45W_0HDR_STR-EKORG sy-vline 
WA_MC45W_0HDR_STR-ERDAT sy-vline 
WA_MC45W_0HDR_STR-ERNAM sy-vline 
WA_MC45W_0HDR_STR-GSKTO sy-vline 
WA_MC45W_0HDR_STR-GSKTOD sy-vline 
WA_MC45W_0HDR_STR-HWAER sy-vline 
WA_MC45W_0HDR_STR-KKBER sy-vline 
WA_MC45W_0HDR_STR-KUNRE sy-vline 
WA_MC45W_0HDR_STR-KUNRG sy-vline 
WA_MC45W_0HDR_STR-KURST sy-vline 
WA_MC45W_0HDR_STR-LANDL sy-vline 
WA_MC45W_0HDR_STR-LFART sy-vline 
WA_MC45W_0HDR_STR-LFART_RL sy-vline 
WA_MC45W_0HDR_STR-LFGRU sy-vline 
WA_MC45W_0HDR_STR-LFTYP sy-vline 
WA_MC45W_0HDR_STR-LIFRE sy-vline 
WA_MC45W_0HDR_STR-LNRZB sy-vline 
WA_MC45W_0HDR_STR-LOGSYS sy-vline 
WA_MC45W_0HDR_STR-MWSBK sy-vline 
WA_MC45W_0HDR_STR-MWSBKD sy-vline 
WA_MC45W_0HDR_STR-NETWR sy-vline 
WA_MC45W_0HDR_STR-NETWRD sy-vline 
WA_MC45W_0HDR_STR-RFBSK sy-vline 
WA_MC45W_0HDR_STR-SPART sy-vline 
WA_MC45W_0HDR_STR-STAFO sy-vline 
WA_MC45W_0HDR_STR-VKBUR sy-vline 
WA_MC45W_0HDR_STR-VKGRP sy-vline 
WA_MC45W_0HDR_STR-VKORG sy-vline 
WA_MC45W_0HDR_STR-VTWEG sy-vline 
WA_MC45W_0HDR_STR-WAERL sy-vline 
WA_MC45W_0HDR_STR-WBELN sy-vline 
WA_MC45W_0HDR_STR-WBELN_RL sy-vline 
WA_MC45W_0HDR_STR-WBTYP sy-vline 
WA_MC45W_0HDR_STR-WDTYP sy-vline 
WA_MC45W_0HDR_STR-WFDAT sy-vline 
WA_MC45W_0HDR_STR-WFDAT_RL sy-vline 
WA_MC45W_0HDR_STR-WRART sy-vline 
WA_MC45W_0HDR_STR-WRTYP sy-vline 
WA_MC45W_0HDR_STR-WSTWAE sy-vline 
WA_MC45W_0HDR_STR-ZEITP sy-vline 
WA_MC45W_0HDR_STR-PERIV sy-vline 
WA_MC45W_0HDR_STR-NOHDR sy-vline 
WA_MC45W_0HDR_STR-ANZVGRL sy-vline 
WA_MC45W_0HDR_STR-ANZVGLF sy-vline 
WA_MC45W_0HDR_STR-ANZRG sy-vline 
WA_MC45W_0HDR_STR-ANZLF sy-vline      INTO ld_text SEPARATED BY SPACE.

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