ABAP Select data from SAP table /SDF/ALPERFCUS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SDF/ALPERFCUS
*  INTO TABLE @DATA(IT_/SDF/ALPERFCUS2).
*--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_/SDF/ALPERFCUS INDEX 1 INTO DATA(WA_/SDF/ALPERFCUS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SDF/ALPERFCUS>-CUSTSTAT = 1.
</SDF/ALPERFCUS>-RELVALTYPE = 1.
</SDF/ALPERFCUS>-THRESHDIR = 1.
</SDF/ALPERFCUS>-THRESHSTAT = 1.
</SDF/ALPERFCUS>-ACTIVTHG2Y = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SDF/ALPERFCUS-ACTIVTHY2R, sy-vline,
  WA_/SDF/ALPERFCUS-ACTIVTHY2G, sy-vline,
  WA_/SDF/ALPERFCUS-ACTIVTHR2Y, sy-vline,
  WA_/SDF/ALPERFCUS-DEFAUTHG2Y, sy-vline,
  WA_/SDF/ALPERFCUS-DEFAUTHY2R, sy-vline,
  WA_/SDF/ALPERFCUS-DEFAUTHY2G, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SDF/ALPERFCUS 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_/SDF/ALPERFCUS 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_/SDF/ALPERFCUS INTO WA_/SDF/ALPERFCUS.


*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_/SDF/ALPERFCUS_STR, 
CUSTSTAT TYPE STRING,
RELVALTYPE TYPE STRING,
THRESHDIR TYPE STRING,
THRESHSTAT TYPE STRING,
ACTIVTHG2Y TYPE STRING,
ACTIVTHY2R TYPE STRING,
ACTIVTHY2G TYPE STRING,
ACTIVTHR2Y TYPE STRING,
DEFAUTHG2Y TYPE STRING,
DEFAUTHY2R TYPE STRING,
DEFAUTHY2G TYPE STRING,
DEFAUTHR2Y TYPE STRING,
MSGCLASS TYPE STRING,
MSGID TYPE STRING,
CUSGRPNAME TYPE STRING,
VALUNIT TYPE STRING,
DECIMALS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SDF/ALPERFCUS_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_/SDF/ALPERFCUS_STR-CUSTSTAT sy-vline 
WA_/SDF/ALPERFCUS_STR-RELVALTYPE sy-vline 
WA_/SDF/ALPERFCUS_STR-THRESHDIR sy-vline 
WA_/SDF/ALPERFCUS_STR-THRESHSTAT sy-vline 
WA_/SDF/ALPERFCUS_STR-ACTIVTHG2Y sy-vline 
WA_/SDF/ALPERFCUS_STR-ACTIVTHY2R sy-vline 
WA_/SDF/ALPERFCUS_STR-ACTIVTHY2G sy-vline 
WA_/SDF/ALPERFCUS_STR-ACTIVTHR2Y sy-vline 
WA_/SDF/ALPERFCUS_STR-DEFAUTHG2Y sy-vline 
WA_/SDF/ALPERFCUS_STR-DEFAUTHY2R sy-vline 
WA_/SDF/ALPERFCUS_STR-DEFAUTHY2G sy-vline 
WA_/SDF/ALPERFCUS_STR-DEFAUTHR2Y sy-vline 
WA_/SDF/ALPERFCUS_STR-MSGCLASS sy-vline 
WA_/SDF/ALPERFCUS_STR-MSGID sy-vline 
WA_/SDF/ALPERFCUS_STR-CUSGRPNAME sy-vline 
WA_/SDF/ALPERFCUS_STR-VALUNIT sy-vline 
WA_/SDF/ALPERFCUS_STR-DECIMALS sy-vline      INTO ld_text SEPARATED BY SPACE.

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