ABAP Select data from SAP table PSG01 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PSG01 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 PSG01. 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 PSG01 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_PSG01 TYPE STANDARD TABLE OF PSG01,
      WA_PSG01 TYPE PSG01,
      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: <PSG01> TYPE PSG01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PSG01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PSG01
  INTO TABLE IT_PSG01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PSG01
*  INTO TABLE @DATA(IT_PSG012).
*--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_PSG01 INDEX 1 INTO DATA(WA_PSG012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PSG01 ASSIGNING <PSG01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PSG01>-SCHEM = 1.
<PSG01>-DIVIS = 1.
<PSG01>-QTTYP = 1.
<PSG01>-CUTYR = 1.
<PSG01>-SALGP = 1.

ENDLOOP.

LOOP AT IT_PSG01 INTO WA_PSG01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PSG01-MOPGK, sy-vline,
  WA_PSG01-MOZKO, sy-vline,
  WA_PSG01-BUKRS, sy-vline,
  WA_PSG01-WERKS, sy-vline,
  WA_PSG01-BTRTL, sy-vline,
  WA_PSG01-PERSG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PSG01 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_PSG01 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_PSG01 INTO WA_PSG01.


*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_PSG01_STR, 
SCHEM TYPE STRING,
DIVIS TYPE STRING,
QTTYP TYPE STRING,
CUTYR TYPE STRING,
SALGP TYPE STRING,
MOPGK TYPE STRING,
MOZKO TYPE STRING,
BUKRS TYPE STRING,
WERKS TYPE STRING,
BTRTL TYPE STRING,
PERSG TYPE STRING,
PERSK TYPE STRING,
MOLGA TYPE STRING,
MOURA TYPE STRING,
URART TYPE STRING,
SBGRU TYPE STRING,
SBPRO TYPE STRING,
AGEJJ TYPE STRING,
DAUER TYPE STRING,
TRFAR TYPE STRING,
TRFGB TYPE STRING,
TRFGR TYPE STRING,
TRFST TYPE STRING,
SCHKZ TYPE STRING,
URLZK TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
PERNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PSG01_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_PSG01_STR-SCHEM sy-vline 
WA_PSG01_STR-DIVIS sy-vline 
WA_PSG01_STR-QTTYP sy-vline 
WA_PSG01_STR-CUTYR sy-vline 
WA_PSG01_STR-SALGP sy-vline 
WA_PSG01_STR-MOPGK sy-vline 
WA_PSG01_STR-MOZKO sy-vline 
WA_PSG01_STR-BUKRS sy-vline 
WA_PSG01_STR-WERKS sy-vline 
WA_PSG01_STR-BTRTL sy-vline 
WA_PSG01_STR-PERSG sy-vline 
WA_PSG01_STR-PERSK sy-vline 
WA_PSG01_STR-MOLGA sy-vline 
WA_PSG01_STR-MOURA sy-vline 
WA_PSG01_STR-URART sy-vline 
WA_PSG01_STR-SBGRU sy-vline 
WA_PSG01_STR-SBPRO sy-vline 
WA_PSG01_STR-AGEJJ sy-vline 
WA_PSG01_STR-DAUER sy-vline 
WA_PSG01_STR-TRFAR sy-vline 
WA_PSG01_STR-TRFGB sy-vline 
WA_PSG01_STR-TRFGR sy-vline 
WA_PSG01_STR-TRFST sy-vline 
WA_PSG01_STR-SCHKZ sy-vline 
WA_PSG01_STR-URLZK sy-vline 
WA_PSG01_STR-BEGDA sy-vline 
WA_PSG01_STR-ENDDA sy-vline 
WA_PSG01_STR-PERNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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