ABAP Select data from SAP table ESERVICE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESERVICE
*  INTO TABLE @DATA(IT_ESERVICE2).
*--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_ESERVICE INDEX 1 INTO DATA(WA_ESERVICE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ESERVICE>-MANDT = 1.
<ESERVICE>-VERTRAG = 1.
<ESERVICE>-INT_UI = 1.
<ESERVICE>-SERVICE_START = 1.
<ESERVICE>-SERVICE_END = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ESERVICE-SERVICE, sy-vline,
  WA_ESERVICE-SERVICEID, sy-vline,
  WA_ESERVICE-SRVPRVREF, sy-vline,
  WA_ESERVICE-SERVPROV_PAY, sy-vline,
  WA_ESERVICE-SPARTE, sy-vline,
  WA_ESERVICE-STARTOBJTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ESERVICE 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_ESERVICE 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_ESERVICE INTO WA_ESERVICE.


*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 VERTRAG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESERVICE-VERTRAG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESERVICE-VERTRAG.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field ENDOBJKEY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESERVICE-ENDOBJKEY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESERVICE-ENDOBJKEY.
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_ESERVICE_STR, 
MANDT TYPE STRING,
VERTRAG TYPE STRING,
INT_UI TYPE STRING,
SERVICE_START TYPE STRING,
SERVICE_END TYPE STRING,
SERVICE TYPE STRING,
SERVICEID TYPE STRING,
SRVPRVREF TYPE STRING,
SERVPROV_PAY TYPE STRING,
SPARTE TYPE STRING,
STARTOBJTYPE TYPE STRING,
STARTOBJKEY TYPE STRING,
ENDOBJTYPE TYPE STRING,
ENDOBJKEY TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
BEGRU TYPE STRING,
LOEVM TYPE STRING,
PREV_SERV_START TYPE STRING,
PREV_SERV_END TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ESERVICE_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_ESERVICE_STR-MANDT sy-vline 
WA_ESERVICE_STR-VERTRAG sy-vline 
WA_ESERVICE_STR-INT_UI sy-vline 
WA_ESERVICE_STR-SERVICE_START sy-vline 
WA_ESERVICE_STR-SERVICE_END sy-vline 
WA_ESERVICE_STR-SERVICE sy-vline 
WA_ESERVICE_STR-SERVICEID sy-vline 
WA_ESERVICE_STR-SRVPRVREF sy-vline 
WA_ESERVICE_STR-SERVPROV_PAY sy-vline 
WA_ESERVICE_STR-SPARTE sy-vline 
WA_ESERVICE_STR-STARTOBJTYPE sy-vline 
WA_ESERVICE_STR-STARTOBJKEY sy-vline 
WA_ESERVICE_STR-ENDOBJTYPE sy-vline 
WA_ESERVICE_STR-ENDOBJKEY sy-vline 
WA_ESERVICE_STR-ERDAT sy-vline 
WA_ESERVICE_STR-ERNAM sy-vline 
WA_ESERVICE_STR-AEDAT sy-vline 
WA_ESERVICE_STR-AENAM sy-vline 
WA_ESERVICE_STR-BEGRU sy-vline 
WA_ESERVICE_STR-LOEVM sy-vline 
WA_ESERVICE_STR-PREV_SERV_START sy-vline 
WA_ESERVICE_STR-PREV_SERV_END sy-vline      INTO ld_text SEPARATED BY SPACE.

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