ABAP Select data from SAP table WBB_LAYGR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WBB_LAYGR
*  INTO TABLE @DATA(IT_WBB_LAYGR2).
*--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_WBB_LAYGR INDEX 1 INTO DATA(WA_WBB_LAYGR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WBB_LAYGR>-ABTNR = 1.
<WBB_LAYGR>-LAYVR = 1.
<WBB_LAYGR>-LNLGV = 1.
<WBB_LAYGR>-LAYGR = 1.
<WBB_LAYGR>-LMVER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WBB_LAYGR-LMVAR, sy-vline,
  WA_WBB_LAYGR-SORF1, sy-vline,
  WA_WBB_LAYGR-FACIN, sy-vline,
  WA_WBB_LAYGR-SHELF, sy-vline,
  WA_WBB_LAYGR-MEVOR, sy-vline,
  WA_WBB_LAYGR-MELAY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WBB_LAYGR 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_WBB_LAYGR 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_WBB_LAYGR INTO WA_WBB_LAYGR.


*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 CUNIT, internal->external for field MELAY
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WBB_LAYGR-MELAY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WBB_LAYGR-MELAY.
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_WBB_LAYGR_STR, 
ABTNR TYPE STRING,
LAYVR TYPE STRING,
LNLGV TYPE STRING,
LAYGR TYPE STRING,
LMVER TYPE STRING,
LMVAR TYPE STRING,
SORF1 TYPE STRING,
FACIN TYPE STRING,
SHELF TYPE STRING,
MEVOR TYPE STRING,
MELAY TYPE STRING,
HPLGR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WBB_LAYGR_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_WBB_LAYGR_STR-ABTNR sy-vline 
WA_WBB_LAYGR_STR-LAYVR sy-vline 
WA_WBB_LAYGR_STR-LNLGV sy-vline 
WA_WBB_LAYGR_STR-LAYGR sy-vline 
WA_WBB_LAYGR_STR-LMVER sy-vline 
WA_WBB_LAYGR_STR-LMVAR sy-vline 
WA_WBB_LAYGR_STR-SORF1 sy-vline 
WA_WBB_LAYGR_STR-FACIN sy-vline 
WA_WBB_LAYGR_STR-SHELF sy-vline 
WA_WBB_LAYGR_STR-MEVOR sy-vline 
WA_WBB_LAYGR_STR-MELAY sy-vline 
WA_WBB_LAYGR_STR-HPLGR sy-vline      INTO ld_text SEPARATED BY SPACE.

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