ABAP Select data from SAP table PDS_COMP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PDS_COMP
*  INTO TABLE @DATA(IT_PDS_COMP2).
*--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_PDS_COMP INDEX 1 INTO DATA(WA_PDS_COMP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PDS_COMP>-MANDT = 1.
<PDS_COMP>-GUID = 1.
<PDS_COMP>-GUID_COMP = 1.
<PDS_COMP>-WERKS = 1.
<PDS_COMP>-MATNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PDS_COMP-STLTY, sy-vline,
  WA_PDS_COMP-STLNR, sy-vline,
  WA_PDS_COMP-ELIFN, sy-vline,
  WA_PDS_COMP-STLAL, sy-vline,
  WA_PDS_COMP-STLAN, sy-vline,
  WA_PDS_COMP-STVKN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PDS_COMP 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_PDS_COMP 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_PDS_COMP INTO WA_PDS_COMP.


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

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

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

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

*Conversion exit NUMCV, internal->external for field POSNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_PDS_COMP-POSNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PDS_COMP-POSNR.
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_PDS_COMP_STR, 
MANDT TYPE STRING,
GUID TYPE STRING,
GUID_COMP TYPE STRING,
WERKS TYPE STRING,
MATNR TYPE STRING,
STLTY TYPE STRING,
STLNR TYPE STRING,
ELIFN TYPE STRING,
STLAL TYPE STRING,
STLAN TYPE STRING,
STVKN TYPE STRING,
STPOZ TYPE STRING,
POSTP TYPE STRING,
POSNR TYPE STRING,
CONS_TYPE TYPE STRING,
SCM_CLASS TYPE STRING,
CREATE_USER TYPE STRING,
CREATE_TIME TYPE STRING,
CHANGE_USER TYPE STRING,
CHANGE_TIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PDS_COMP_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_PDS_COMP_STR-MANDT sy-vline 
WA_PDS_COMP_STR-GUID sy-vline 
WA_PDS_COMP_STR-GUID_COMP sy-vline 
WA_PDS_COMP_STR-WERKS sy-vline 
WA_PDS_COMP_STR-MATNR sy-vline 
WA_PDS_COMP_STR-STLTY sy-vline 
WA_PDS_COMP_STR-STLNR sy-vline 
WA_PDS_COMP_STR-ELIFN sy-vline 
WA_PDS_COMP_STR-STLAL sy-vline 
WA_PDS_COMP_STR-STLAN sy-vline 
WA_PDS_COMP_STR-STVKN sy-vline 
WA_PDS_COMP_STR-STPOZ sy-vline 
WA_PDS_COMP_STR-POSTP sy-vline 
WA_PDS_COMP_STR-POSNR sy-vline 
WA_PDS_COMP_STR-CONS_TYPE sy-vline 
WA_PDS_COMP_STR-SCM_CLASS sy-vline 
WA_PDS_COMP_STR-CREATE_USER sy-vline 
WA_PDS_COMP_STR-CREATE_TIME sy-vline 
WA_PDS_COMP_STR-CHANGE_USER sy-vline 
WA_PDS_COMP_STR-CHANGE_TIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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