ABAP Select data from SAP table RESB_WM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RESB_WM
*  INTO TABLE @DATA(IT_RESB_WM2).
*--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_RESB_WM INDEX 1 INTO DATA(WA_RESB_WM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RESB_WM>-RSNUM = 1.
<RESB_WM>-RSPOS = 1.
<RESB_WM>-BERKZ = 1.
<RESB_WM>-LGNUM = 1.
<RESB_WM>-LGTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RESB_WM-LGPLA, sy-vline,
  WA_RESB_WM-TBMNG, sy-vline,
  WA_RESB_WM-ABLAD, sy-vline,
  WA_RESB_WM-RSART, sy-vline,
  WA_RESB_WM-UMLGO, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_RESB_WM 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_RESB_WM 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_RESB_WM INTO WA_RESB_WM.


*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.
ENDFORM. 

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

TYPES: BEGIN OF T_RESB_WM_STR, 
RSNUM TYPE STRING,
RSPOS TYPE STRING,
BERKZ TYPE STRING,
LGNUM TYPE STRING,
LGTYP TYPE STRING,
LGPLA TYPE STRING,
TBMNG TYPE STRING,
ABLAD TYPE STRING,
RSART TYPE STRING,
UMLGO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RESB_WM_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_RESB_WM_STR-RSNUM sy-vline 
WA_RESB_WM_STR-RSPOS sy-vline 
WA_RESB_WM_STR-BERKZ sy-vline 
WA_RESB_WM_STR-LGNUM sy-vline 
WA_RESB_WM_STR-LGTYP sy-vline 
WA_RESB_WM_STR-LGPLA sy-vline 
WA_RESB_WM_STR-TBMNG sy-vline 
WA_RESB_WM_STR-ABLAD sy-vline 
WA_RESB_WM_STR-RSART sy-vline 
WA_RESB_WM_STR-UMLGO sy-vline      INTO ld_text SEPARATED BY SPACE.

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