ABAP Select data from SAP table PSG8D into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PSG8D 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 PSG8D. 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 PSG8D 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_PSG8D TYPE STANDARD TABLE OF PSG8D,
      WA_PSG8D TYPE PSG8D,
      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: <PSG8D> TYPE PSG8D.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PSG8D.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PSG8D
  INTO TABLE IT_PSG8D.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PSG8D
*  INTO TABLE @DATA(IT_PSG8D2).
*--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_PSG8D INDEX 1 INTO DATA(WA_PSG8D2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PSG8D ASSIGNING <PSG8D>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PSG8D>-WERKS = 1.
<PSG8D>-BTRTL = 1.
<PSG8D>-PERSG = 1.
<PSG8D>-PERSK = 1.
<PSG8D>-MOLGA = 1.

ENDLOOP.

LOOP AT IT_PSG8D INTO WA_PSG8D.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PSG8D-MASSG, sy-vline,
  WA_PSG8D-STYPE, sy-vline,
  WA_PSG8D-EENMS, sy-vline,
  WA_PSG8D-HIRED, sy-vline,
  WA_PSG8D-TRFKZ, sy-vline,
  WA_PSG8D-TRFGR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PSG8D 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_PSG8D 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_PSG8D INTO WA_PSG8D.


*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 KOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PSG8D-KOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSG8D-KOSTL.
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_PSG8D_STR, 
WERKS TYPE STRING,
BTRTL TYPE STRING,
PERSG TYPE STRING,
PERSK TYPE STRING,
MOLGA TYPE STRING,
MASSG TYPE STRING,
STYPE TYPE STRING,
EENMS TYPE STRING,
HIRED TYPE STRING,
TRFKZ TYPE STRING,
TRFGR TYPE STRING,
TRFST TYPE STRING,
PTYPE TYPE STRING,
PREAS TYPE STRING,
TRFAR TYPE STRING,
TRFGB TYPE STRING,
BUKRS TYPE STRING,
KOSTL TYPE STRING,
ABKRS TYPE STRING,
PLANS TYPE STRING,
STELL TYPE STRING,
MASSN TYPE STRING,
AGEJJ TYPE STRING,
PEACD TYPE STRING,
BENTY TYPE STRING,
KONSL TYPE STRING,
SCCAT TYPE STRING,
SCSTA TYPE STRING,
SCHEM TYPE STRING,
DIVIS TYPE STRING,
PAYPR TYPE STRING,
NPROB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PSG8D_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_PSG8D_STR-WERKS sy-vline 
WA_PSG8D_STR-BTRTL sy-vline 
WA_PSG8D_STR-PERSG sy-vline 
WA_PSG8D_STR-PERSK sy-vline 
WA_PSG8D_STR-MOLGA sy-vline 
WA_PSG8D_STR-MASSG sy-vline 
WA_PSG8D_STR-STYPE sy-vline 
WA_PSG8D_STR-EENMS sy-vline 
WA_PSG8D_STR-HIRED sy-vline 
WA_PSG8D_STR-TRFKZ sy-vline 
WA_PSG8D_STR-TRFGR sy-vline 
WA_PSG8D_STR-TRFST sy-vline 
WA_PSG8D_STR-PTYPE sy-vline 
WA_PSG8D_STR-PREAS sy-vline 
WA_PSG8D_STR-TRFAR sy-vline 
WA_PSG8D_STR-TRFGB sy-vline 
WA_PSG8D_STR-BUKRS sy-vline 
WA_PSG8D_STR-KOSTL sy-vline 
WA_PSG8D_STR-ABKRS sy-vline 
WA_PSG8D_STR-PLANS sy-vline 
WA_PSG8D_STR-STELL sy-vline 
WA_PSG8D_STR-MASSN sy-vline 
WA_PSG8D_STR-AGEJJ sy-vline 
WA_PSG8D_STR-PEACD sy-vline 
WA_PSG8D_STR-BENTY sy-vline 
WA_PSG8D_STR-KONSL sy-vline 
WA_PSG8D_STR-SCCAT sy-vline 
WA_PSG8D_STR-SCSTA sy-vline 
WA_PSG8D_STR-SCHEM sy-vline 
WA_PSG8D_STR-DIVIS sy-vline 
WA_PSG8D_STR-PAYPR sy-vline 
WA_PSG8D_STR-NPROB sy-vline      INTO ld_text SEPARATED BY SPACE.

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