ABAP Select data from SAP table COMPRES 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 COMPRES 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 COMPRES. 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 COMPRES 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_COMPRES TYPE STANDARD TABLE OF COMPRES,
      WA_COMPRES TYPE COMPRES,
      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: <COMPRES> TYPE COMPRES.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COMPRES
*  INTO TABLE @DATA(IT_COMPRES2).
*--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_COMPRES INDEX 1 INTO DATA(WA_COMPRES2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COMPRES>-OBJTY = 1.
<COMPRES>-AUFNR1 = 1.
<COMPRES>-MAUFNR1 = 1.
<COMPRES>-STUFE1 = 1.
<COMPRES>-WEGXX1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COMPRES-VSNMR1, sy-vline,
  WA_COMPRES-AUFPL1, sy-vline,
  WA_COMPRES-POSNR1, sy-vline,
  WA_COMPRES-PLNFL1, sy-vline,
  WA_COMPRES-APLFL1, sy-vline,
  WA_COMPRES-APLZL1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COMPRES 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_COMPRES 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_COMPRES INTO WA_COMPRES.


*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_COMPRES-AUFNR1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMPRES-AUFNR1.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field PLNFL1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMPRES-PLNFL1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMPRES-PLNFL1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field APLFL1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMPRES-APLFL1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMPRES-APLFL1.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field MAUFNR2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMPRES-MAUFNR2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMPRES-MAUFNR2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNFL2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMPRES-PLNFL2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMPRES-PLNFL2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field APLFL2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMPRES-APLFL2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMPRES-APLFL2.
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_COMPRES_STR, 
OBJTY TYPE STRING,
AUFNR1 TYPE STRING,
MAUFNR1 TYPE STRING,
STUFE1 TYPE STRING,
WEGXX1 TYPE STRING,
VSNMR1 TYPE STRING,
AUFPL1 TYPE STRING,
POSNR1 TYPE STRING,
PLNFL1 TYPE STRING,
APLFL1 TYPE STRING,
APLZL1 TYPE STRING,
SUMNR1 TYPE STRING,
RSNUM1 TYPE STRING,
RSPOS1 TYPE STRING,
RSART1 TYPE STRING,
PZLFH1 TYPE STRING,
DBSKZ1 TYPE STRING,
AUFNR2 TYPE STRING,
MAUFNR2 TYPE STRING,
STUFE2 TYPE STRING,
WEGXX2 TYPE STRING,
VSNMR2 TYPE STRING,
AUFPL2 TYPE STRING,
POSNR2 TYPE STRING,
PLNFL2 TYPE STRING,
APLFL2 TYPE STRING,
APLZL2 TYPE STRING,
SUMNR2 TYPE STRING,
RSNUM2 TYPE STRING,
RSPOS2 TYPE STRING,
RSART2 TYPE STRING,
PZLFH2 TYPE STRING,
DBSKZ2 TYPE STRING,
RESULT TYPE STRING,
LOWDIFF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COMPRES_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_COMPRES_STR-OBJTY sy-vline 
WA_COMPRES_STR-AUFNR1 sy-vline 
WA_COMPRES_STR-MAUFNR1 sy-vline 
WA_COMPRES_STR-STUFE1 sy-vline 
WA_COMPRES_STR-WEGXX1 sy-vline 
WA_COMPRES_STR-VSNMR1 sy-vline 
WA_COMPRES_STR-AUFPL1 sy-vline 
WA_COMPRES_STR-POSNR1 sy-vline 
WA_COMPRES_STR-PLNFL1 sy-vline 
WA_COMPRES_STR-APLFL1 sy-vline 
WA_COMPRES_STR-APLZL1 sy-vline 
WA_COMPRES_STR-SUMNR1 sy-vline 
WA_COMPRES_STR-RSNUM1 sy-vline 
WA_COMPRES_STR-RSPOS1 sy-vline 
WA_COMPRES_STR-RSART1 sy-vline 
WA_COMPRES_STR-PZLFH1 sy-vline 
WA_COMPRES_STR-DBSKZ1 sy-vline 
WA_COMPRES_STR-AUFNR2 sy-vline 
WA_COMPRES_STR-MAUFNR2 sy-vline 
WA_COMPRES_STR-STUFE2 sy-vline 
WA_COMPRES_STR-WEGXX2 sy-vline 
WA_COMPRES_STR-VSNMR2 sy-vline 
WA_COMPRES_STR-AUFPL2 sy-vline 
WA_COMPRES_STR-POSNR2 sy-vline 
WA_COMPRES_STR-PLNFL2 sy-vline 
WA_COMPRES_STR-APLFL2 sy-vline 
WA_COMPRES_STR-APLZL2 sy-vline 
WA_COMPRES_STR-SUMNR2 sy-vline 
WA_COMPRES_STR-RSNUM2 sy-vline 
WA_COMPRES_STR-RSPOS2 sy-vline 
WA_COMPRES_STR-RSART2 sy-vline 
WA_COMPRES_STR-PZLFH2 sy-vline 
WA_COMPRES_STR-DBSKZ2 sy-vline 
WA_COMPRES_STR-RESULT sy-vline 
WA_COMPRES_STR-LOWDIFF sy-vline      INTO ld_text SEPARATED BY SPACE.

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