ABAP Select data from SAP table WVLB_LB_COUPLE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WVLB_LB_COUPLE
*  INTO TABLE @DATA(IT_WVLB_LB_COUPLE2).
*--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_WVLB_LB_COUPLE INDEX 1 INTO DATA(WA_WVLB_LB_COUPLE2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WVLB_LB_COUPLE-VENDOR_EKORZ, sy-vline,
  WA_WVLB_LB_COUPLE-PLANT_EKORZ, sy-vline,
  WA_WVLB_LB_COUPLE-BOPNR, sy-vline,
  WA_WVLB_LB_COUPLE-DESIRE_VENSL, sy-vline,
  WA_WVLB_LB_COUPLE-FABKL, sy-vline,
  WA_WVLB_LB_COUPLE-KUNNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WVLB_LB_COUPLE 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_WVLB_LB_COUPLE 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_WVLB_LB_COUPLE INTO WA_WVLB_LB_COUPLE.


*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_WVLB_LB_COUPLE-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WVLB_LB_COUPLE-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WVLB_LB_COUPLE-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WVLB_LB_COUPLE-KUNNR.
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_WVLB_LB_COUPLE_STR, 
LBPRF TYPE STRING,
LIFNR TYPE STRING,
EKORG TYPE STRING,
LTSNR TYPE STRING,
WERKS TYPE STRING,
VENDOR_EKORZ TYPE STRING,
PLANT_EKORZ TYPE STRING,
BOPNR TYPE STRING,
DESIRE_VENSL TYPE STRING,
FABKL TYPE STRING,
KUNNR TYPE STRING,
GTERM TYPE STRING,
TODAY_0 TYPE STRING,
TODAY_1 TYPE STRING,
TODAY_2 TYPE STRING,
FKDAY_T0 TYPE STRING,
FKDAY_T1 TYPE STRING,
FKDAY_T2 TYPE STRING,
CUR_VENSL_T0 TYPE STRING,
CUR_VENSL_T1 TYPE STRING,
CUR_VENSL_T2 TYPE STRING,
PO_DATE TYPE STRING,
DELIVERY_DATE TYPE STRING,
KKOWK TYPE STRING,
RESULT_ENTRY TYPE STRING,
LFRHY TYPE STRING,
PLIFZ TYPE STRING,
SOURCETIME TYPE STRING,
NUM_R_MATNR TYPE STRING,
NUM_R_EKPO TYPE STRING,
NUM_R_EBAN TYPE STRING,
NUM_W_EKPO TYPE STRING,
NUM_W_EBAN TYPE STRING,
NUM_W_WBO2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WVLB_LB_COUPLE_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_WVLB_LB_COUPLE_STR-LBPRF sy-vline 
WA_WVLB_LB_COUPLE_STR-LIFNR sy-vline 
WA_WVLB_LB_COUPLE_STR-EKORG sy-vline 
WA_WVLB_LB_COUPLE_STR-LTSNR sy-vline 
WA_WVLB_LB_COUPLE_STR-WERKS sy-vline 
WA_WVLB_LB_COUPLE_STR-VENDOR_EKORZ sy-vline 
WA_WVLB_LB_COUPLE_STR-PLANT_EKORZ sy-vline 
WA_WVLB_LB_COUPLE_STR-BOPNR sy-vline 
WA_WVLB_LB_COUPLE_STR-DESIRE_VENSL sy-vline 
WA_WVLB_LB_COUPLE_STR-FABKL sy-vline 
WA_WVLB_LB_COUPLE_STR-KUNNR sy-vline 
WA_WVLB_LB_COUPLE_STR-GTERM sy-vline 
WA_WVLB_LB_COUPLE_STR-TODAY_0 sy-vline 
WA_WVLB_LB_COUPLE_STR-TODAY_1 sy-vline 
WA_WVLB_LB_COUPLE_STR-TODAY_2 sy-vline 
WA_WVLB_LB_COUPLE_STR-FKDAY_T0 sy-vline 
WA_WVLB_LB_COUPLE_STR-FKDAY_T1 sy-vline 
WA_WVLB_LB_COUPLE_STR-FKDAY_T2 sy-vline 
WA_WVLB_LB_COUPLE_STR-CUR_VENSL_T0 sy-vline 
WA_WVLB_LB_COUPLE_STR-CUR_VENSL_T1 sy-vline 
WA_WVLB_LB_COUPLE_STR-CUR_VENSL_T2 sy-vline 
WA_WVLB_LB_COUPLE_STR-PO_DATE sy-vline 
WA_WVLB_LB_COUPLE_STR-DELIVERY_DATE sy-vline 
WA_WVLB_LB_COUPLE_STR-KKOWK sy-vline 
WA_WVLB_LB_COUPLE_STR-RESULT_ENTRY sy-vline 
WA_WVLB_LB_COUPLE_STR-LFRHY sy-vline 
WA_WVLB_LB_COUPLE_STR-PLIFZ sy-vline 
WA_WVLB_LB_COUPLE_STR-SOURCETIME sy-vline 
WA_WVLB_LB_COUPLE_STR-NUM_R_MATNR sy-vline 
WA_WVLB_LB_COUPLE_STR-NUM_R_EKPO sy-vline 
WA_WVLB_LB_COUPLE_STR-NUM_R_EBAN sy-vline 
WA_WVLB_LB_COUPLE_STR-NUM_W_EKPO sy-vline 
WA_WVLB_LB_COUPLE_STR-NUM_W_EBAN sy-vline 
WA_WVLB_LB_COUPLE_STR-NUM_W_WBO2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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