ABAP Select data from SAP table WB2_WIND_ALV into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WB2_WIND_ALV 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 WB2_WIND_ALV. 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 WB2_WIND_ALV 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_WB2_WIND_ALV TYPE STANDARD TABLE OF WB2_WIND_ALV,
      WA_WB2_WIND_ALV TYPE WB2_WIND_ALV,
      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: <WB2_WIND_ALV> TYPE WB2_WIND_ALV.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_WB2_WIND_ALV.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM WB2_WIND_ALV
  INTO TABLE IT_WB2_WIND_ALV.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WB2_WIND_ALV
*  INTO TABLE @DATA(IT_WB2_WIND_ALV2).
*--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_WB2_WIND_ALV INDEX 1 INTO DATA(WA_WB2_WIND_ALV2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_WB2_WIND_ALV ASSIGNING <WB2_WIND_ALV>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WB2_WIND_ALV>-BLTYP = 1.
<WB2_WIND_ALV>-BELNR = 1.
<WB2_WIND_ALV>-POSNR = 1.
<WB2_WIND_ALV>-DATUM = 1.
<WB2_WIND_ALV>-DATUM2 = 1.

ENDLOOP.

LOOP AT IT_WB2_WIND_ALV INTO WA_WB2_WIND_ALV.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WB2_WIND_ALV-SELKZ, sy-vline,
  WA_WB2_WIND_ALV-KUNNR, sy-vline,
  WA_WB2_WIND_ALV-ELIFN, sy-vline,
  WA_WB2_WIND_ALV-MATNR, sy-vline,
  WA_WB2_WIND_ALV-WERKS, sy-vline,
  WA_WB2_WIND_ALV-BUDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WB2_WIND_ALV 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_WB2_WIND_ALV 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_WB2_WIND_ALV INTO WA_WB2_WIND_ALV.


*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 BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WB2_WIND_ALV-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_WIND_ALV-BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WB2_WIND_ALV-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_WIND_ALV-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ELIFN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WB2_WIND_ALV-ELIFN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_WIND_ALV-ELIFN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WB2_WIND_ALV-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WB2_WIND_ALV-MATNR.
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_WB2_WIND_ALV_STR, 
BLTYP TYPE STRING,
BELNR TYPE STRING,
POSNR TYPE STRING,
DATUM TYPE STRING,
DATUM2 TYPE STRING,
SELKZ TYPE STRING,
KUNNR TYPE STRING,
ELIFN TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
BUDAT TYPE STRING,
TCTYP TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WB2_WIND_ALV_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_WB2_WIND_ALV_STR-BLTYP sy-vline 
WA_WB2_WIND_ALV_STR-BELNR sy-vline 
WA_WB2_WIND_ALV_STR-POSNR sy-vline 
WA_WB2_WIND_ALV_STR-DATUM sy-vline 
WA_WB2_WIND_ALV_STR-DATUM2 sy-vline 
WA_WB2_WIND_ALV_STR-SELKZ sy-vline 
WA_WB2_WIND_ALV_STR-KUNNR sy-vline 
WA_WB2_WIND_ALV_STR-ELIFN sy-vline 
WA_WB2_WIND_ALV_STR-MATNR sy-vline 
WA_WB2_WIND_ALV_STR-WERKS sy-vline 
WA_WB2_WIND_ALV_STR-BUDAT sy-vline 
WA_WB2_WIND_ALV_STR-TCTYP sy-vline 
WA_WB2_WIND_ALV_STR-VKORG sy-vline 
WA_WB2_WIND_ALV_STR-VTWEG sy-vline 
WA_WB2_WIND_ALV_STR-SPART sy-vline 
WA_WB2_WIND_ALV_STR-EKORG sy-vline 
WA_WB2_WIND_ALV_STR-EKGRP sy-vline      INTO ld_text SEPARATED BY SPACE.

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