ABAP Select data from SAP table COMPHDR into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP COMPHDR 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 COMPHDR. 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 COMPHDR 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_COMPHDR TYPE STANDARD TABLE OF COMPHDR,
      WA_COMPHDR TYPE COMPHDR,
      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: <COMPHDR> TYPE COMPHDR.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COMPHDR
*  INTO TABLE @DATA(IT_COMPHDR2).
*--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_COMPHDR INDEX 1 INTO DATA(WA_COMPHDR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COMPHDR>-MANDT = 1.
<COMPHDR>-COMPNUM = 1.
<COMPHDR>-COMPCNT = 1.
<COMPHDR>-AUFNR1 = 1.
<COMPHDR>-VSNMR1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COMPHDR-MAUFNR1, sy-vline,
  WA_COMPHDR-STUFE1, sy-vline,
  WA_COMPHDR-WEGXX1, sy-vline,
  WA_COMPHDR-AUFPL1, sy-vline,
  WA_COMPHDR-RSNUM1, sy-vline,
  WA_COMPHDR-ARSNR1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COMPHDR 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_COMPHDR 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_COMPHDR INTO WA_COMPHDR.


*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 AUFNR1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMPHDR-AUFNR1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMPHDR-AUFNR1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MAUFNR1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMPHDR-MAUFNR1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMPHDR-MAUFNR1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AUFNR2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMPHDR-AUFNR2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMPHDR-AUFNR2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MAUFNR2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMPHDR-MAUFNR2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMPHDR-MAUFNR2.
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_COMPHDR_STR, 
MANDT TYPE STRING,
COMPNUM TYPE STRING,
COMPCNT TYPE STRING,
AUFNR1 TYPE STRING,
VSNMR1 TYPE STRING,
MAUFNR1 TYPE STRING,
STUFE1 TYPE STRING,
WEGXX1 TYPE STRING,
AUFPL1 TYPE STRING,
RSNUM1 TYPE STRING,
ARSNR1 TYPE STRING,
ARSPS1 TYPE STRING,
AUFNR2 TYPE STRING,
VSNMR2 TYPE STRING,
MAUFNR2 TYPE STRING,
STUFE2 TYPE STRING,
WEGXX2 TYPE STRING,
AUFPL2 TYPE STRING,
RSNUM2 TYPE STRING,
ARSNR2 TYPE STRING,
ARSPS2 TYPE STRING,
RESULT TYPE STRING,
LOWDIFF TYPE STRING,
CONFTYP TYPE STRING,
STATUS TYPE STRING,
KTEXT TYPE STRING,
MOVED TYPE STRING,
MAXCONFTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COMPHDR_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_COMPHDR_STR-MANDT sy-vline 
WA_COMPHDR_STR-COMPNUM sy-vline 
WA_COMPHDR_STR-COMPCNT sy-vline 
WA_COMPHDR_STR-AUFNR1 sy-vline 
WA_COMPHDR_STR-VSNMR1 sy-vline 
WA_COMPHDR_STR-MAUFNR1 sy-vline 
WA_COMPHDR_STR-STUFE1 sy-vline 
WA_COMPHDR_STR-WEGXX1 sy-vline 
WA_COMPHDR_STR-AUFPL1 sy-vline 
WA_COMPHDR_STR-RSNUM1 sy-vline 
WA_COMPHDR_STR-ARSNR1 sy-vline 
WA_COMPHDR_STR-ARSPS1 sy-vline 
WA_COMPHDR_STR-AUFNR2 sy-vline 
WA_COMPHDR_STR-VSNMR2 sy-vline 
WA_COMPHDR_STR-MAUFNR2 sy-vline 
WA_COMPHDR_STR-STUFE2 sy-vline 
WA_COMPHDR_STR-WEGXX2 sy-vline 
WA_COMPHDR_STR-AUFPL2 sy-vline 
WA_COMPHDR_STR-RSNUM2 sy-vline 
WA_COMPHDR_STR-ARSNR2 sy-vline 
WA_COMPHDR_STR-ARSPS2 sy-vline 
WA_COMPHDR_STR-RESULT sy-vline 
WA_COMPHDR_STR-LOWDIFF sy-vline 
WA_COMPHDR_STR-CONFTYP sy-vline 
WA_COMPHDR_STR-STATUS sy-vline 
WA_COMPHDR_STR-KTEXT sy-vline 
WA_COMPHDR_STR-MOVED sy-vline 
WA_COMPHDR_STR-MAXCONFTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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