ABAP Select data from SAP table ESLA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESLA
*  INTO TABLE @DATA(IT_ESLA2).
*--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_ESLA INDEX 1 INTO DATA(WA_ESLA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ESLA>-MANDT = 1.
<ESLA>-LBNUM = 1.
<ESLA>-AUSGB = 1.
<ESLA>-STRKT = 1.
<ESLA>-KZEDT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ESLA-KZVRW, sy-vline,
  WA_ESLA-KZHIR, sy-vline,
  WA_ESLA-KZVWM, sy-vline,
  WA_ESLA-LOEKZ, sy-vline,
  WA_ESLA-LBDTV, sy-vline,
  WA_ESLA-LBDTB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ESLA 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_ESLA 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_ESLA INTO WA_ESLA.


*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_ESLA_STR, 
MANDT TYPE STRING,
LBNUM TYPE STRING,
AUSGB TYPE STRING,
STRKT TYPE STRING,
KZEDT TYPE STRING,
KZVRW TYPE STRING,
KZHIR TYPE STRING,
KZVWM TYPE STRING,
LOEKZ TYPE STRING,
LBDTV TYPE STRING,
LBDTB TYPE STRING,
AENDT TYPE STRING,
AEUHR TYPE STRING,
AENAM TYPE STRING,
ERNAM TYPE STRING,
BKLAS TYPE STRING,
FORM1 TYPE STRING,
LENG1 TYPE STRING,
TRKZ1 TYPE STRING,
FORM2 TYPE STRING,
LENG2 TYPE STRING,
TRKZ2 TYPE STRING,
FORM3 TYPE STRING,
LENG3 TYPE STRING,
TRKZ3 TYPE STRING,
FORM4 TYPE STRING,
LENG4 TYPE STRING,
TRKZ4 TYPE STRING,
FORM5 TYPE STRING,
LENG5 TYPE STRING,
TRKZ5 TYPE STRING,
FORM6 TYPE STRING,
LENG6 TYPE STRING,
TRKZ6 TYPE STRING,
ASTYP TYPE STRING,
MATKL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ESLA_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_ESLA_STR-MANDT sy-vline 
WA_ESLA_STR-LBNUM sy-vline 
WA_ESLA_STR-AUSGB sy-vline 
WA_ESLA_STR-STRKT sy-vline 
WA_ESLA_STR-KZEDT sy-vline 
WA_ESLA_STR-KZVRW sy-vline 
WA_ESLA_STR-KZHIR sy-vline 
WA_ESLA_STR-KZVWM sy-vline 
WA_ESLA_STR-LOEKZ sy-vline 
WA_ESLA_STR-LBDTV sy-vline 
WA_ESLA_STR-LBDTB sy-vline 
WA_ESLA_STR-AENDT sy-vline 
WA_ESLA_STR-AEUHR sy-vline 
WA_ESLA_STR-AENAM sy-vline 
WA_ESLA_STR-ERNAM sy-vline 
WA_ESLA_STR-BKLAS sy-vline 
WA_ESLA_STR-FORM1 sy-vline 
WA_ESLA_STR-LENG1 sy-vline 
WA_ESLA_STR-TRKZ1 sy-vline 
WA_ESLA_STR-FORM2 sy-vline 
WA_ESLA_STR-LENG2 sy-vline 
WA_ESLA_STR-TRKZ2 sy-vline 
WA_ESLA_STR-FORM3 sy-vline 
WA_ESLA_STR-LENG3 sy-vline 
WA_ESLA_STR-TRKZ3 sy-vline 
WA_ESLA_STR-FORM4 sy-vline 
WA_ESLA_STR-LENG4 sy-vline 
WA_ESLA_STR-TRKZ4 sy-vline 
WA_ESLA_STR-FORM5 sy-vline 
WA_ESLA_STR-LENG5 sy-vline 
WA_ESLA_STR-TRKZ5 sy-vline 
WA_ESLA_STR-FORM6 sy-vline 
WA_ESLA_STR-LENG6 sy-vline 
WA_ESLA_STR-TRKZ6 sy-vline 
WA_ESLA_STR-ASTYP sy-vline 
WA_ESLA_STR-MATKL sy-vline      INTO ld_text SEPARATED BY SPACE.

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