ABAP Select data from SAP table COMP_MAN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COMP_MAN
*  INTO TABLE @DATA(IT_COMP_MAN2).
*--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_COMP_MAN INDEX 1 INTO DATA(WA_COMP_MAN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COMP_MAN>-WERKS = 1.
<COMP_MAN>-VORNR = 1.
<COMP_MAN>-APLZL = 1.
<COMP_MAN>-MATNR = 1.
<COMP_MAN>-LGORT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COMP_MAN-CHARG, sy-vline,
  WA_COMP_MAN-XWAOK, sy-vline,
  WA_COMP_MAN-SOBKZ, sy-vline,
  WA_COMP_MAN-LIFNR, sy-vline,
  WA_COMP_MAN-MENGE, sy-vline,
  WA_COMP_MAN-EINHEIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COMP_MAN 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_COMP_MAN 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_COMP_MAN INTO WA_COMP_MAN.


*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 NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_COMP_MAN-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMP_MAN-VORNR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit CUNIT, internal->external for field EINHEIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_COMP_MAN-EINHEIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMP_MAN-EINHEIT.
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_COMP_MAN_STR, 
WERKS TYPE STRING,
VORNR TYPE STRING,
APLZL TYPE STRING,
MATNR TYPE STRING,
LGORT TYPE STRING,
CHARG TYPE STRING,
XWAOK TYPE STRING,
SOBKZ TYPE STRING,
LIFNR TYPE STRING,
MENGE TYPE STRING,
EINHEIT TYPE STRING,
FMENG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COMP_MAN_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_COMP_MAN_STR-WERKS sy-vline 
WA_COMP_MAN_STR-VORNR sy-vline 
WA_COMP_MAN_STR-APLZL sy-vline 
WA_COMP_MAN_STR-MATNR sy-vline 
WA_COMP_MAN_STR-LGORT sy-vline 
WA_COMP_MAN_STR-CHARG sy-vline 
WA_COMP_MAN_STR-XWAOK sy-vline 
WA_COMP_MAN_STR-SOBKZ sy-vline 
WA_COMP_MAN_STR-LIFNR sy-vline 
WA_COMP_MAN_STR-MENGE sy-vline 
WA_COMP_MAN_STR-EINHEIT sy-vline 
WA_COMP_MAN_STR-FMENG sy-vline      INTO ld_text SEPARATED BY SPACE.

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