ABAP Select data from SAP table ESVC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESVC
*  INTO TABLE @DATA(IT_ESVC2).
*--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_ESVC INDEX 1 INTO DATA(WA_ESVC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ESVC>-MANDT = 1.
<ESVC>-PACKNO = 1.
<ESVC>-INTROW = 1.
<ESVC>-SRVMAPKEY = 1.
<ESVC>-EBELN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ESVC-EBELP, sy-vline,
  WA_ESVC-ETENS, sy-vline,
  WA_ESVC-EBTYP, sy-vline,
  WA_ESVC-ESTKZ, sy-vline,
  WA_ESVC-XBLNR, sy-vline,
  WA_ESVC-ERDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ESVC 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_ESVC 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_ESVC INTO WA_ESVC.


*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.

*Conversion exit ALPHA, internal->external for field EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESVC-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESVC-EBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ESVC-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESVC-MEINS.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_ESVC_STR, 
MANDT TYPE STRING,
PACKNO TYPE STRING,
INTROW TYPE STRING,
SRVMAPKEY TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
ETENS TYPE STRING,
EBTYP TYPE STRING,
ESTKZ TYPE STRING,
XBLNR TYPE STRING,
ERDAT TYPE STRING,
EZEIT TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
MENGE_OLD TYPE STRING,
BRTWR TYPE STRING,
BRTWR_OLD TYPE STRING,
LOEKZ TYPE STRING,
KZABN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ESVC_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_ESVC_STR-MANDT sy-vline 
WA_ESVC_STR-PACKNO sy-vline 
WA_ESVC_STR-INTROW sy-vline 
WA_ESVC_STR-SRVMAPKEY sy-vline 
WA_ESVC_STR-EBELN sy-vline 
WA_ESVC_STR-EBELP sy-vline 
WA_ESVC_STR-ETENS sy-vline 
WA_ESVC_STR-EBTYP sy-vline 
WA_ESVC_STR-ESTKZ sy-vline 
WA_ESVC_STR-XBLNR sy-vline 
WA_ESVC_STR-ERDAT sy-vline 
WA_ESVC_STR-EZEIT sy-vline 
WA_ESVC_STR-MENGE sy-vline 
WA_ESVC_STR-MEINS sy-vline 
WA_ESVC_STR-MENGE_OLD sy-vline 
WA_ESVC_STR-BRTWR sy-vline 
WA_ESVC_STR-BRTWR_OLD sy-vline 
WA_ESVC_STR-LOEKZ sy-vline 
WA_ESVC_STR-KZABN sy-vline      INTO ld_text SEPARATED BY SPACE.

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