ABAP Select data from SAP table WEPSS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WEPSS
*  INTO TABLE @DATA(IT_WEPSS2).
*--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_WEPSS INDEX 1 INTO DATA(WA_WEPSS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WEPSS>-EPSSERVER = 1.
<WEPSS>-EPSFILNAM = 1.
<WEPSS>-EPSDIRNAM = 1.
<WEPSS>-EPSTARFIL = 1.
<WEPSS>-EPSTARDIR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WEPSS-EPSSUBJECT, sy-vline,
  WA_WEPSS-EPSCOMMENT, sy-vline,
  WA_WEPSS-EPSOS, sy-vline,
  WA_WEPSS-EPSDB, sy-vline,
  WA_WEPSS-EPSMINREL, sy-vline,
  WA_WEPSS-EPSMAXREL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WEPSS 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_WEPSS 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_WEPSS INTO WA_WEPSS.


*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_WEPSS_STR, 
EPSSERVER TYPE STRING,
EPSFILNAM TYPE STRING,
EPSDIRNAM TYPE STRING,
EPSTARFIL TYPE STRING,
EPSTARDIR TYPE STRING,
EPSSUBJECT TYPE STRING,
EPSCOMMENT TYPE STRING,
EPSOS TYPE STRING,
EPSDB TYPE STRING,
EPSMINREL TYPE STRING,
EPSMAXREL TYPE STRING,
EPSRECADR TYPE STRING,
EPSDEST TYPE STRING,
EPSPCLNAM TYPE STRING,
EPSPCLSIZ TYPE STRING,
EPSPCLSIZ1 TYPE STRING,
TRKORR TYPE STRING,
EPSPCLORI TYPE STRING,
EPSPCLNUM TYPE STRING,
EPSPCLNUM1 TYPE STRING,
EPSPCLEXT TYPE STRING,
EPSRELFLG TYPE STRING,
EPSDELRC TYPE STRING,
EPSDELRC1 TYPE STRING,
EPSSTATUS TYPE STRING,
EPSPCLOWN TYPE STRING,
EPSRSPUSR TYPE STRING,
EPSCREDAT TYPE STRING,
EPSORDDAT TYPE STRING,
EPSDELDAT TYPE STRING,
EPSSNDADR TYPE STRING,
EPSCREDAT1 TYPE STRING,
EPSORDDAT1 TYPE STRING,
EPSDELDAT1 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WEPSS_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_WEPSS_STR-EPSSERVER sy-vline 
WA_WEPSS_STR-EPSFILNAM sy-vline 
WA_WEPSS_STR-EPSDIRNAM sy-vline 
WA_WEPSS_STR-EPSTARFIL sy-vline 
WA_WEPSS_STR-EPSTARDIR sy-vline 
WA_WEPSS_STR-EPSSUBJECT sy-vline 
WA_WEPSS_STR-EPSCOMMENT sy-vline 
WA_WEPSS_STR-EPSOS sy-vline 
WA_WEPSS_STR-EPSDB sy-vline 
WA_WEPSS_STR-EPSMINREL sy-vline 
WA_WEPSS_STR-EPSMAXREL sy-vline 
WA_WEPSS_STR-EPSRECADR sy-vline 
WA_WEPSS_STR-EPSDEST sy-vline 
WA_WEPSS_STR-EPSPCLNAM sy-vline 
WA_WEPSS_STR-EPSPCLSIZ sy-vline 
WA_WEPSS_STR-EPSPCLSIZ1 sy-vline 
WA_WEPSS_STR-TRKORR sy-vline 
WA_WEPSS_STR-EPSPCLORI sy-vline 
WA_WEPSS_STR-EPSPCLNUM sy-vline 
WA_WEPSS_STR-EPSPCLNUM1 sy-vline 
WA_WEPSS_STR-EPSPCLEXT sy-vline 
WA_WEPSS_STR-EPSRELFLG sy-vline 
WA_WEPSS_STR-EPSDELRC sy-vline 
WA_WEPSS_STR-EPSDELRC1 sy-vline 
WA_WEPSS_STR-EPSSTATUS sy-vline 
WA_WEPSS_STR-EPSPCLOWN sy-vline 
WA_WEPSS_STR-EPSRSPUSR sy-vline 
WA_WEPSS_STR-EPSCREDAT sy-vline 
WA_WEPSS_STR-EPSORDDAT sy-vline 
WA_WEPSS_STR-EPSDELDAT sy-vline 
WA_WEPSS_STR-EPSSNDADR sy-vline 
WA_WEPSS_STR-EPSCREDAT1 sy-vline 
WA_WEPSS_STR-EPSORDDAT1 sy-vline 
WA_WEPSS_STR-EPSDELDAT1 sy-vline      INTO ld_text SEPARATED BY SPACE.

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