ABAP Select data from SAP table UESKL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM UESKL
*  INTO TABLE @DATA(IT_UESKL2).
*--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_UESKL INDEX 1 INTO DATA(WA_UESKL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<UESKL>-MANDT = 1.
<UESKL>-PACKNO = 1.
<UESKL>-INTROW = 1.
<UESKL>-NUMKN = 1.
<UESKL>-AEDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_UESKL-LOEKZ, sy-vline,
  WA_UESKL-NOACT, sy-vline,
  WA_UESKL-MENGE, sy-vline,
  WA_UESKL-WPROZ, sy-vline,
  WA_UESKL-NETWR, sy-vline,
  WA_UESKL-ZEKKN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_UESKL 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_UESKL 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_UESKL INTO WA_UESKL.


*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_UESKL_STR, 
MANDT TYPE STRING,
PACKNO TYPE STRING,
INTROW TYPE STRING,
NUMKN TYPE STRING,
AEDAT TYPE STRING,
LOEKZ TYPE STRING,
NOACT TYPE STRING,
MENGE TYPE STRING,
WPROZ TYPE STRING,
NETWR TYPE STRING,
ZEKKN TYPE STRING,
HPACKNO TYPE STRING,
ACT_MENGE TYPE STRING,
ACT_WERT TYPE STRING,
PLN_NUMKN TYPE STRING,
NAVNW TYPE STRING,
LFPOS TYPE STRING,
INV_MENGE TYPE STRING,
FINAL TYPE STRING,
FINAL_QTY TYPE STRING,
FINAL_REASON TYPE STRING,
AA_FINAL_QTY_F TYPE STRING,
MENGE_F TYPE STRING,
_DATAAGING TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_UESKL_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_UESKL_STR-MANDT sy-vline 
WA_UESKL_STR-PACKNO sy-vline 
WA_UESKL_STR-INTROW sy-vline 
WA_UESKL_STR-NUMKN sy-vline 
WA_UESKL_STR-AEDAT sy-vline 
WA_UESKL_STR-LOEKZ sy-vline 
WA_UESKL_STR-NOACT sy-vline 
WA_UESKL_STR-MENGE sy-vline 
WA_UESKL_STR-WPROZ sy-vline 
WA_UESKL_STR-NETWR sy-vline 
WA_UESKL_STR-ZEKKN sy-vline 
WA_UESKL_STR-HPACKNO sy-vline 
WA_UESKL_STR-ACT_MENGE sy-vline 
WA_UESKL_STR-ACT_WERT sy-vline 
WA_UESKL_STR-PLN_NUMKN sy-vline 
WA_UESKL_STR-NAVNW sy-vline 
WA_UESKL_STR-LFPOS sy-vline 
WA_UESKL_STR-INV_MENGE sy-vline 
WA_UESKL_STR-FINAL sy-vline 
WA_UESKL_STR-FINAL_QTY sy-vline 
WA_UESKL_STR-FINAL_REASON sy-vline 
WA_UESKL_STR-AA_FINAL_QTY_F sy-vline 
WA_UESKL_STR-MENGE_F sy-vline 
WA_UESKL_STR-_DATAAGING sy-vline 
WA_UESKL_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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