ABAP Select data from SAP table ESKL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESKL
*  INTO TABLE @DATA(IT_ESKL2).
*--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_ESKL INDEX 1 INTO DATA(WA_ESKL2).


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

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

ENDLOOP.

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

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


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

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