ABAP Select data from SAP table /SAPAPO/PEGKEY into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /SAPAPO/PEGKEY 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 /SAPAPO/PEGKEY. 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 /SAPAPO/PEGKEY 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_/SAPAPO/PEGKEY TYPE STANDARD TABLE OF /SAPAPO/PEGKEY,
      WA_/SAPAPO/PEGKEY TYPE /SAPAPO/PEGKEY,
      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: </SAPAPO/PEGKEY> TYPE /SAPAPO/PEGKEY.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /SAPAPO/PEGKEY
  INTO TABLE IT_/SAPAPO/PEGKEY.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPAPO/PEGKEY
*  INTO TABLE @DATA(IT_/SAPAPO/PEGKEY2).
*--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_/SAPAPO/PEGKEY INDEX 1 INTO DATA(WA_/SAPAPO/PEGKEY2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/SAPAPO/PEGKEY ASSIGNING </SAPAPO/PEGKEY>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPAPO/PEGKEY>-MANDT = 1.
</SAPAPO/PEGKEY>-PEGID = 1.
</SAPAPO/PEGKEY>-MATID = 1.
</SAPAPO/PEGKEY>-LOCID = 1.
</SAPAPO/PEGKEY>-SIMID = 1.

ENDLOOP.

LOOP AT IT_/SAPAPO/PEGKEY INTO WA_/SAPAPO/PEGKEY.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPAPO/PEGKEY-ACCID, sy-vline,
  WA_/SAPAPO/PEGKEY-PLSEC, sy-vline,
  WA_/SAPAPO/PEGKEY-NETCH_SNP, sy-vline,
  WA_/SAPAPO/PEGKEY-NETCH_RRP, sy-vline,
  WA_/SAPAPO/PEGKEY-NETCH_BOP, sy-vline,
  WA_/SAPAPO/PEGKEY-LAST_CHANGE_LC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPAPO/PEGKEY 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_/SAPAPO/PEGKEY 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_/SAPAPO/PEGKEY INTO WA_/SAPAPO/PEGKEY.


*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 VRSIO, internal->external for field SIMID
CALL FUNCTION 'CONVERSION_EXIT_VRSIO_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/PEGKEY-SIMID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/PEGKEY-SIMID.
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_/SAPAPO/PEGKEY_STR, 
MANDT TYPE STRING,
PEGID TYPE STRING,
MATID TYPE STRING,
LOCID TYPE STRING,
SIMID TYPE STRING,
ACCID TYPE STRING,
PLSEC TYPE STRING,
NETCH_SNP TYPE STRING,
NETCH_RRP TYPE STRING,
NETCH_BOP TYPE STRING,
LAST_CHANGE_LC TYPE STRING,
LAST_NETCH_RRP TYPE STRING,
RRP_EVENT TYPE STRING,
UPDIN TYPE STRING,
NETCH_RRP_TSTMP TYPE STRING,
NETCH_FEA TYPE STRING,
NETCH_FEA_TSTMP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPAPO/PEGKEY_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_/SAPAPO/PEGKEY_STR-MANDT sy-vline 
WA_/SAPAPO/PEGKEY_STR-PEGID sy-vline 
WA_/SAPAPO/PEGKEY_STR-MATID sy-vline 
WA_/SAPAPO/PEGKEY_STR-LOCID sy-vline 
WA_/SAPAPO/PEGKEY_STR-SIMID sy-vline 
WA_/SAPAPO/PEGKEY_STR-ACCID sy-vline 
WA_/SAPAPO/PEGKEY_STR-PLSEC sy-vline 
WA_/SAPAPO/PEGKEY_STR-NETCH_SNP sy-vline 
WA_/SAPAPO/PEGKEY_STR-NETCH_RRP sy-vline 
WA_/SAPAPO/PEGKEY_STR-NETCH_BOP sy-vline 
WA_/SAPAPO/PEGKEY_STR-LAST_CHANGE_LC sy-vline 
WA_/SAPAPO/PEGKEY_STR-LAST_NETCH_RRP sy-vline 
WA_/SAPAPO/PEGKEY_STR-RRP_EVENT sy-vline 
WA_/SAPAPO/PEGKEY_STR-UPDIN sy-vline 
WA_/SAPAPO/PEGKEY_STR-NETCH_RRP_TSTMP sy-vline 
WA_/SAPAPO/PEGKEY_STR-NETCH_FEA sy-vline 
WA_/SAPAPO/PEGKEY_STR-NETCH_FEA_TSTMP sy-vline      INTO ld_text SEPARATED BY SPACE.

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