ABAP Select data from SAP table WLF_KNVV_RG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WLF_KNVV_RG
*  INTO TABLE @DATA(IT_WLF_KNVV_RG2).
*--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_WLF_KNVV_RG INDEX 1 INTO DATA(WA_WLF_KNVV_RG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WLF_KNVV_RG>-MANDT = 1.
<WLF_KNVV_RG>-KUNNR = 1.
<WLF_KNVV_RG>-VKORG = 1.
<WLF_KNVV_RG>-VTWEG = 1.
<WLF_KNVV_RG>-SPART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WLF_KNVV_RG-ERNAM, sy-vline,
  WA_WLF_KNVV_RG-ERDAT, sy-vline,
  WA_WLF_KNVV_RG-BEGRU, sy-vline,
  WA_WLF_KNVV_RG-LOEVM, sy-vline,
  WA_WLF_KNVV_RG-VERSG, sy-vline,
  WA_WLF_KNVV_RG-AUFSD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WLF_KNVV_RG 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_WLF_KNVV_RG 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_WLF_KNVV_RG INTO WA_WLF_KNVV_RG.


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

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

*Conversion exit TSTRG, internal->external for field PODTG
CALL FUNCTION 'CONVERSION_EXIT_TSTRG_OUTPUT'
  EXPORTING
    input =                      WA_WLF_KNVV_RG-PODTG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_KNVV_RG-PODTG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ID004, internal->external for field INCO2_KEY
CALL FUNCTION 'CONVERSION_EXIT_ID004_OUTPUT'
  EXPORTING
    input =                      WA_WLF_KNVV_RG-INCO2_KEY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_KNVV_RG-INCO2_KEY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ID004, internal->external for field INCO3_KEY
CALL FUNCTION 'CONVERSION_EXIT_ID004_OUTPUT'
  EXPORTING
    input =                      WA_WLF_KNVV_RG-INCO3_KEY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_KNVV_RG-INCO3_KEY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ID004, internal->external for field INCO4_KEY
CALL FUNCTION 'CONVERSION_EXIT_ID004_OUTPUT'
  EXPORTING
    input =                      WA_WLF_KNVV_RG-INCO4_KEY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_KNVV_RG-INCO4_KEY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FSH_MSOCDC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WLF_KNVV_RG-FSH_MSOCDC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WLF_KNVV_RG-FSH_MSOCDC.
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_WLF_KNVV_RG_STR, 
MANDT TYPE STRING,
KUNNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
BEGRU TYPE STRING,
LOEVM TYPE STRING,
VERSG TYPE STRING,
AUFSD TYPE STRING,
KALKS TYPE STRING,
KDGRP TYPE STRING,
BZIRK TYPE STRING,
KONDA TYPE STRING,
PLTYP TYPE STRING,
AWAHR TYPE STRING,
INCO1 TYPE STRING,
INCO2 TYPE STRING,
LIFSD TYPE STRING,
AUTLF TYPE STRING,
ANTLF TYPE STRING,
KZTLF TYPE STRING,
KZAZU TYPE STRING,
CHSPL TYPE STRING,
LPRIO TYPE STRING,
EIKTO TYPE STRING,
VSBED TYPE STRING,
FAKSD TYPE STRING,
MRNKZ TYPE STRING,
PERFK TYPE STRING,
PERRL TYPE STRING,
KVAKZ TYPE STRING,
KVAWT TYPE STRING,
WAERS TYPE STRING,
KLABC TYPE STRING,
KTGRD TYPE STRING,
ZTERM TYPE STRING,
VWERK TYPE STRING,
VKGRP TYPE STRING,
VKBUR TYPE STRING,
VSORT TYPE STRING,
KVGR1 TYPE STRING,
KVGR2 TYPE STRING,
KVGR3 TYPE STRING,
KVGR4 TYPE STRING,
KVGR5 TYPE STRING,
BOKRE TYPE STRING,
BOIDT TYPE STRING,
KURST TYPE STRING,
PRFRE TYPE STRING,
PRAT1 TYPE STRING,
PRAT2 TYPE STRING,
PRAT3 TYPE STRING,
PRAT4 TYPE STRING,
PRAT5 TYPE STRING,
PRAT6 TYPE STRING,
PRAT7 TYPE STRING,
PRAT8 TYPE STRING,
PRAT9 TYPE STRING,
PRATA TYPE STRING,
KABSS TYPE STRING,
KKBER TYPE STRING,
CASSD TYPE STRING,
RDOFF TYPE STRING,
AGREL TYPE STRING,
MEGRU TYPE STRING,
UEBTO TYPE STRING,
UNTTO TYPE STRING,
UEBTK TYPE STRING,
PVKSM TYPE STRING,
PODKZ TYPE STRING,
PODTG TYPE STRING,
BLIND TYPE STRING,
CARRIER_NOTIF TYPE STRING,
CVP_XBLCK_V TYPE STRING,
INCOV TYPE STRING,
INCO2_L TYPE STRING,
INCO3_L TYPE STRING,
INCO2_KEY TYPE STRING,
INCO3_KEY TYPE STRING,
INCO4_KEY TYPE STRING,
KNVV_EEW_CONTACT TYPE STRING,
STATUS_OBJ_GUID TYPE STRING,
BILLPLAN_PROC TYPE STRING,
KNVV_ADDR_EEW_CUST TYPE STRING,
/BEV1/EMLGPFAND TYPE STRING,
/BEV1/EMLGFORTS TYPE STRING,
J_1NBOESL TYPE STRING,
FSH_KVGR6 TYPE STRING,
FSH_KVGR7 TYPE STRING,
FSH_KVGR8 TYPE STRING,
FSH_KVGR9 TYPE STRING,
FSH_KVGR10 TYPE STRING,
FSH_GRREG TYPE STRING,
FSH_RESGY TYPE STRING,
FSH_SC_CID TYPE STRING,
FSH_VAS_DETC TYPE STRING,
FSH_VAS_CG TYPE STRING,
FSH_GRSGY TYPE STRING,
FSH_SS TYPE STRING,
FSH_FRATE TYPE STRING,
FSH_FRATE_AGG_LEVEL TYPE STRING,
FSH_MSOCDC TYPE STRING,
FSH_MSOPID TYPE STRING,
RFM_PSST_RULE TYPE STRING,
RFM_PSST_EXCLUDE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WLF_KNVV_RG_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_WLF_KNVV_RG_STR-MANDT sy-vline 
WA_WLF_KNVV_RG_STR-KUNNR sy-vline 
WA_WLF_KNVV_RG_STR-VKORG sy-vline 
WA_WLF_KNVV_RG_STR-VTWEG sy-vline 
WA_WLF_KNVV_RG_STR-SPART sy-vline 
WA_WLF_KNVV_RG_STR-ERNAM sy-vline 
WA_WLF_KNVV_RG_STR-ERDAT sy-vline 
WA_WLF_KNVV_RG_STR-BEGRU sy-vline 
WA_WLF_KNVV_RG_STR-LOEVM sy-vline 
WA_WLF_KNVV_RG_STR-VERSG sy-vline 
WA_WLF_KNVV_RG_STR-AUFSD sy-vline 
WA_WLF_KNVV_RG_STR-KALKS sy-vline 
WA_WLF_KNVV_RG_STR-KDGRP sy-vline 
WA_WLF_KNVV_RG_STR-BZIRK sy-vline 
WA_WLF_KNVV_RG_STR-KONDA sy-vline 
WA_WLF_KNVV_RG_STR-PLTYP sy-vline 
WA_WLF_KNVV_RG_STR-AWAHR sy-vline 
WA_WLF_KNVV_RG_STR-INCO1 sy-vline 
WA_WLF_KNVV_RG_STR-INCO2 sy-vline 
WA_WLF_KNVV_RG_STR-LIFSD sy-vline 
WA_WLF_KNVV_RG_STR-AUTLF sy-vline 
WA_WLF_KNVV_RG_STR-ANTLF sy-vline 
WA_WLF_KNVV_RG_STR-KZTLF sy-vline 
WA_WLF_KNVV_RG_STR-KZAZU sy-vline 
WA_WLF_KNVV_RG_STR-CHSPL sy-vline 
WA_WLF_KNVV_RG_STR-LPRIO sy-vline 
WA_WLF_KNVV_RG_STR-EIKTO sy-vline 
WA_WLF_KNVV_RG_STR-VSBED sy-vline 
WA_WLF_KNVV_RG_STR-FAKSD sy-vline 
WA_WLF_KNVV_RG_STR-MRNKZ sy-vline 
WA_WLF_KNVV_RG_STR-PERFK sy-vline 
WA_WLF_KNVV_RG_STR-PERRL sy-vline 
WA_WLF_KNVV_RG_STR-KVAKZ sy-vline 
WA_WLF_KNVV_RG_STR-KVAWT sy-vline 
WA_WLF_KNVV_RG_STR-WAERS sy-vline 
WA_WLF_KNVV_RG_STR-KLABC sy-vline 
WA_WLF_KNVV_RG_STR-KTGRD sy-vline 
WA_WLF_KNVV_RG_STR-ZTERM sy-vline 
WA_WLF_KNVV_RG_STR-VWERK sy-vline 
WA_WLF_KNVV_RG_STR-VKGRP sy-vline 
WA_WLF_KNVV_RG_STR-VKBUR sy-vline 
WA_WLF_KNVV_RG_STR-VSORT sy-vline 
WA_WLF_KNVV_RG_STR-KVGR1 sy-vline 
WA_WLF_KNVV_RG_STR-KVGR2 sy-vline 
WA_WLF_KNVV_RG_STR-KVGR3 sy-vline 
WA_WLF_KNVV_RG_STR-KVGR4 sy-vline 
WA_WLF_KNVV_RG_STR-KVGR5 sy-vline 
WA_WLF_KNVV_RG_STR-BOKRE sy-vline 
WA_WLF_KNVV_RG_STR-BOIDT sy-vline 
WA_WLF_KNVV_RG_STR-KURST sy-vline 
WA_WLF_KNVV_RG_STR-PRFRE sy-vline 
WA_WLF_KNVV_RG_STR-PRAT1 sy-vline 
WA_WLF_KNVV_RG_STR-PRAT2 sy-vline 
WA_WLF_KNVV_RG_STR-PRAT3 sy-vline 
WA_WLF_KNVV_RG_STR-PRAT4 sy-vline 
WA_WLF_KNVV_RG_STR-PRAT5 sy-vline 
WA_WLF_KNVV_RG_STR-PRAT6 sy-vline 
WA_WLF_KNVV_RG_STR-PRAT7 sy-vline 
WA_WLF_KNVV_RG_STR-PRAT8 sy-vline 
WA_WLF_KNVV_RG_STR-PRAT9 sy-vline 
WA_WLF_KNVV_RG_STR-PRATA sy-vline 
WA_WLF_KNVV_RG_STR-KABSS sy-vline 
WA_WLF_KNVV_RG_STR-KKBER sy-vline 
WA_WLF_KNVV_RG_STR-CASSD sy-vline 
WA_WLF_KNVV_RG_STR-RDOFF sy-vline 
WA_WLF_KNVV_RG_STR-AGREL sy-vline 
WA_WLF_KNVV_RG_STR-MEGRU sy-vline 
WA_WLF_KNVV_RG_STR-UEBTO sy-vline 
WA_WLF_KNVV_RG_STR-UNTTO sy-vline 
WA_WLF_KNVV_RG_STR-UEBTK sy-vline 
WA_WLF_KNVV_RG_STR-PVKSM sy-vline 
WA_WLF_KNVV_RG_STR-PODKZ sy-vline 
WA_WLF_KNVV_RG_STR-PODTG sy-vline 
WA_WLF_KNVV_RG_STR-BLIND sy-vline 
WA_WLF_KNVV_RG_STR-CARRIER_NOTIF sy-vline 
WA_WLF_KNVV_RG_STR-CVP_XBLCK_V sy-vline 
WA_WLF_KNVV_RG_STR-INCOV sy-vline 
WA_WLF_KNVV_RG_STR-INCO2_L sy-vline 
WA_WLF_KNVV_RG_STR-INCO3_L sy-vline 
WA_WLF_KNVV_RG_STR-INCO2_KEY sy-vline 
WA_WLF_KNVV_RG_STR-INCO3_KEY sy-vline 
WA_WLF_KNVV_RG_STR-INCO4_KEY sy-vline 
WA_WLF_KNVV_RG_STR-KNVV_EEW_CONTACT sy-vline 
WA_WLF_KNVV_RG_STR-STATUS_OBJ_GUID sy-vline 
WA_WLF_KNVV_RG_STR-BILLPLAN_PROC sy-vline 
WA_WLF_KNVV_RG_STR-KNVV_ADDR_EEW_CUST sy-vline 
WA_WLF_KNVV_RG_STR-/BEV1/EMLGPFAND sy-vline 
WA_WLF_KNVV_RG_STR-/BEV1/EMLGFORTS sy-vline 
WA_WLF_KNVV_RG_STR-J_1NBOESL sy-vline 
WA_WLF_KNVV_RG_STR-FSH_KVGR6 sy-vline 
WA_WLF_KNVV_RG_STR-FSH_KVGR7 sy-vline 
WA_WLF_KNVV_RG_STR-FSH_KVGR8 sy-vline 
WA_WLF_KNVV_RG_STR-FSH_KVGR9 sy-vline 
WA_WLF_KNVV_RG_STR-FSH_KVGR10 sy-vline 
WA_WLF_KNVV_RG_STR-FSH_GRREG sy-vline 
WA_WLF_KNVV_RG_STR-FSH_RESGY sy-vline 
WA_WLF_KNVV_RG_STR-FSH_SC_CID sy-vline 
WA_WLF_KNVV_RG_STR-FSH_VAS_DETC sy-vline 
WA_WLF_KNVV_RG_STR-FSH_VAS_CG sy-vline 
WA_WLF_KNVV_RG_STR-FSH_GRSGY sy-vline 
WA_WLF_KNVV_RG_STR-FSH_SS sy-vline 
WA_WLF_KNVV_RG_STR-FSH_FRATE sy-vline 
WA_WLF_KNVV_RG_STR-FSH_FRATE_AGG_LEVEL sy-vline 
WA_WLF_KNVV_RG_STR-FSH_MSOCDC sy-vline 
WA_WLF_KNVV_RG_STR-FSH_MSOPID sy-vline 
WA_WLF_KNVV_RG_STR-RFM_PSST_RULE sy-vline 
WA_WLF_KNVV_RG_STR-RFM_PSST_EXCLUDE sy-vline      INTO ld_text SEPARATED BY SPACE.

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