ABAP Select data from SAP table PSG04 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PSG04 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 PSG04. 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 PSG04 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_PSG04 TYPE STANDARD TABLE OF PSG04,
      WA_PSG04 TYPE PSG04,
      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: <PSG04> TYPE PSG04.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PSG04.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PSG04
  INTO TABLE IT_PSG04.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PSG04
*  INTO TABLE @DATA(IT_PSG042).
*--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_PSG04 INDEX 1 INTO DATA(WA_PSG042).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PSG04 ASSIGNING <PSG04>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PSG04>-BUKRS = 1.
<PSG04>-WERKS = 1.
<PSG04>-BTRTL = 1.
<PSG04>-PERSG = 1.
<PSG04>-PERSK = 1.

ENDLOOP.

LOOP AT IT_PSG04 INTO WA_PSG04.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PSG04-PSCPF, sy-vline,
  WA_PSG04-SCHEM, sy-vline,
  WA_PSG04-DIVIS, sy-vline,
  WA_PSG04-SCODE, sy-vline,
  WA_PSG04-SIGRP, sy-vline,
  WA_PSG04-CPFID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PSG04 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_PSG04 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_PSG04 INTO WA_PSG04.


*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_PSG04_STR, 
BUKRS TYPE STRING,
WERKS TYPE STRING,
BTRTL TYPE STRING,
PERSG TYPE STRING,
PERSK TYPE STRING,
PSCPF TYPE STRING,
SCHEM TYPE STRING,
DIVIS TYPE STRING,
SCODE TYPE STRING,
SIGRP TYPE STRING,
CPFID TYPE STRING,
FUNCL TYPE STRING,
CPFNA TYPE STRING,
ABKRS TYPE STRING,
SACHP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PSG04_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_PSG04_STR-BUKRS sy-vline 
WA_PSG04_STR-WERKS sy-vline 
WA_PSG04_STR-BTRTL sy-vline 
WA_PSG04_STR-PERSG sy-vline 
WA_PSG04_STR-PERSK sy-vline 
WA_PSG04_STR-PSCPF sy-vline 
WA_PSG04_STR-SCHEM sy-vline 
WA_PSG04_STR-DIVIS sy-vline 
WA_PSG04_STR-SCODE sy-vline 
WA_PSG04_STR-SIGRP sy-vline 
WA_PSG04_STR-CPFID sy-vline 
WA_PSG04_STR-FUNCL sy-vline 
WA_PSG04_STR-CPFNA sy-vline 
WA_PSG04_STR-ABKRS sy-vline 
WA_PSG04_STR-SACHP sy-vline      INTO ld_text SEPARATED BY SPACE.

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