ABAP Select data from SAP table E2WYT3M into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP E2WYT3M 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 E2WYT3M. 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 E2WYT3M 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_E2WYT3M TYPE STANDARD TABLE OF E2WYT3M,
      WA_E2WYT3M TYPE E2WYT3M,
      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: <E2WYT3M> TYPE E2WYT3M.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E2WYT3M.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E2WYT3M
  INTO TABLE IT_E2WYT3M.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E2WYT3M
*  INTO TABLE @DATA(IT_E2WYT3M2).
*--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_E2WYT3M INDEX 1 INTO DATA(WA_E2WYT3M2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E2WYT3M ASSIGNING <E2WYT3M>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E2WYT3M>-MSGFN = 1.
<E2WYT3M>-LIFNR = 1.
<E2WYT3M>-EKORG = 1.
<E2WYT3M>-LTSNR = 1.
<E2WYT3M>-WERKS = 1.

ENDLOOP.

LOOP AT IT_E2WYT3M INTO WA_E2WYT3M.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E2WYT3M-PARVW, sy-vline,
  WA_E2WYT3M-PARZA, sy-vline,
  WA_E2WYT3M-ERNAM, sy-vline,
  WA_E2WYT3M-ERDAT, sy-vline,
  WA_E2WYT3M-LIFN2, sy-vline,
  WA_E2WYT3M-DEFPA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_E2WYT3M 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_E2WYT3M 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_E2WYT3M INTO WA_E2WYT3M.


*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 LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_E2WYT3M-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_E2WYT3M-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field PARVW
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_E2WYT3M-PARVW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_E2WYT3M-PARVW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_E2WYT3M-LIFN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_E2WYT3M-LIFN2.
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_E2WYT3M_STR, 
MSGFN TYPE STRING,
LIFNR TYPE STRING,
EKORG TYPE STRING,
LTSNR TYPE STRING,
WERKS TYPE STRING,
PARVW TYPE STRING,
PARZA TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
LIFN2 TYPE STRING,
DEFPA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_E2WYT3M_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_E2WYT3M_STR-MSGFN sy-vline 
WA_E2WYT3M_STR-LIFNR sy-vline 
WA_E2WYT3M_STR-EKORG sy-vline 
WA_E2WYT3M_STR-LTSNR sy-vline 
WA_E2WYT3M_STR-WERKS sy-vline 
WA_E2WYT3M_STR-PARVW sy-vline 
WA_E2WYT3M_STR-PARZA sy-vline 
WA_E2WYT3M_STR-ERNAM sy-vline 
WA_E2WYT3M_STR-ERDAT sy-vline 
WA_E2WYT3M_STR-LIFN2 sy-vline 
WA_E2WYT3M_STR-DEFPA sy-vline      INTO ld_text SEPARATED BY SPACE.

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