ABAP Select data from SAP table COMPHD into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COMPHD
*  INTO TABLE @DATA(IT_COMPHD2).
*--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_COMPHD INDEX 1 INTO DATA(WA_COMPHD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COMPHD>-MANDT = 1.
<COMPHD>-COMPNUM = 1.
<COMPHD>-OBJKEY1 = 1.
<COMPHD>-OBJKEY2 = 1.
<COMPHD>-COMPTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COMPHD-CDATE, sy-vline,
  WA_COMPHD-CTIME, sy-vline,
  WA_COMPHD-CUSER, sy-vline,
  WA_COMPHD-STATUS, sy-vline,
  WA_COMPHD-MAXCONFTYP, sy-vline,
  WA_COMPHD-OCMPF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COMPHD 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_COMPHD 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_COMPHD INTO WA_COMPHD.


*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 AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMPHD-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMPHD-AENNR.
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_COMPHD_STR, 
MANDT TYPE STRING,
COMPNUM TYPE STRING,
OBJKEY1 TYPE STRING,
OBJKEY2 TYPE STRING,
COMPTYP TYPE STRING,
CDATE TYPE STRING,
CTIME TYPE STRING,
CUSER TYPE STRING,
STATUS TYPE STRING,
MAXCONFTYP TYPE STRING,
OCMPF TYPE STRING,
VERNR TYPE STRING,
FUNCT TYPE STRING,
TSCOMPL TYPE STRING,
AENNR TYPE STRING,
STTXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COMPHD_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_COMPHD_STR-MANDT sy-vline 
WA_COMPHD_STR-COMPNUM sy-vline 
WA_COMPHD_STR-OBJKEY1 sy-vline 
WA_COMPHD_STR-OBJKEY2 sy-vline 
WA_COMPHD_STR-COMPTYP sy-vline 
WA_COMPHD_STR-CDATE sy-vline 
WA_COMPHD_STR-CTIME sy-vline 
WA_COMPHD_STR-CUSER sy-vline 
WA_COMPHD_STR-STATUS sy-vline 
WA_COMPHD_STR-MAXCONFTYP sy-vline 
WA_COMPHD_STR-OCMPF sy-vline 
WA_COMPHD_STR-VERNR sy-vline 
WA_COMPHD_STR-FUNCT sy-vline 
WA_COMPHD_STR-TSCOMPL sy-vline 
WA_COMPHD_STR-AENNR sy-vline 
WA_COMPHD_STR-STTXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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