ABAP Select data from SAP table PSG8E into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PSG8E 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 PSG8E. 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 PSG8E 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_PSG8E TYPE STANDARD TABLE OF PSG8E,
      WA_PSG8E TYPE PSG8E,
      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: <PSG8E> TYPE PSG8E.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PSG8E.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PSG8E
  INTO TABLE IT_PSG8E.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PSG8E
*  INTO TABLE @DATA(IT_PSG8E2).
*--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_PSG8E INDEX 1 INTO DATA(WA_PSG8E2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PSG8E ASSIGNING <PSG8E>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PSG8E>-INTCD = 1.
<PSG8E>-WERKS = 1.
<PSG8E>-BTRTL = 1.
<PSG8E>-PERSG = 1.
<PSG8E>-PERSK = 1.

ENDLOOP.

LOOP AT IT_PSG8E INTO WA_PSG8E.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PSG8E-MOLGA, sy-vline,
  WA_PSG8E-TRFAR, sy-vline,
  WA_PSG8E-TRFGB, sy-vline,
  WA_PSG8E-TRFKZ, sy-vline,
  WA_PSG8E-TRFGR, sy-vline,
  WA_PSG8E-TRFST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PSG8E 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_PSG8E 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_PSG8E INTO WA_PSG8E.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_PSG8E_STR, 
INTCD TYPE STRING,
WERKS TYPE STRING,
BTRTL TYPE STRING,
PERSG TYPE STRING,
PERSK TYPE STRING,
MOLGA TYPE STRING,
TRFAR TYPE STRING,
TRFGB TYPE STRING,
TRFKZ TYPE STRING,
TRFGR TYPE STRING,
TRFST TYPE STRING,
STYPE TYPE STRING,
PTYPE TYPE STRING,
PREAS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PSG8E_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_PSG8E_STR-INTCD sy-vline 
WA_PSG8E_STR-WERKS sy-vline 
WA_PSG8E_STR-BTRTL sy-vline 
WA_PSG8E_STR-PERSG sy-vline 
WA_PSG8E_STR-PERSK sy-vline 
WA_PSG8E_STR-MOLGA sy-vline 
WA_PSG8E_STR-TRFAR sy-vline 
WA_PSG8E_STR-TRFGB sy-vline 
WA_PSG8E_STR-TRFKZ sy-vline 
WA_PSG8E_STR-TRFGR sy-vline 
WA_PSG8E_STR-TRFST sy-vline 
WA_PSG8E_STR-STYPE sy-vline 
WA_PSG8E_STR-PTYPE sy-vline 
WA_PSG8E_STR-PREAS sy-vline      INTO ld_text SEPARATED BY SPACE.

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