ABAP Select data from SAP table CRM_KNVVX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CRM_KNVVX
*  INTO TABLE @DATA(IT_CRM_KNVVX2).
*--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_CRM_KNVVX INDEX 1 INTO DATA(WA_CRM_KNVVX2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CRM_KNVVX-KLABC, sy-vline,
  WA_CRM_KNVVX-BOKRE, sy-vline,
  WA_CRM_KNVVX-ANTLF, sy-vline,
  WA_CRM_KNVVX-VWERK, sy-vline,
  WA_CRM_KNVVX-PERRL, sy-vline,
  WA_CRM_KNVVX-BZIRK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CRM_KNVVX 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_CRM_KNVVX 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_CRM_KNVVX INTO WA_CRM_KNVVX.


*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_CRM_KNVVX-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CRM_KNVVX-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_CRM_KNVVX_STR, 
BUPA_GUID TYPE STRING,
KUNNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
KLABC TYPE STRING,
BOKRE TYPE STRING,
ANTLF TYPE STRING,
VWERK TYPE STRING,
PERRL TYPE STRING,
BZIRK TYPE STRING,
VKBUR TYPE STRING,
CHSPL TYPE STRING,
PRFRE TYPE STRING,
PERFK TYPE STRING,
VKGRP TYPE STRING,
VSORT TYPE STRING,
KZTLF TYPE STRING,
AWAHR TYPE STRING,
EIKTO TYPE STRING,
MRNKZ TYPE STRING,
VERSG TYPE STRING,
LOEVM TYPE STRING,
TASK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CRM_KNVVX_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_CRM_KNVVX_STR-BUPA_GUID sy-vline 
WA_CRM_KNVVX_STR-KUNNR sy-vline 
WA_CRM_KNVVX_STR-VKORG sy-vline 
WA_CRM_KNVVX_STR-VTWEG sy-vline 
WA_CRM_KNVVX_STR-SPART sy-vline 
WA_CRM_KNVVX_STR-KLABC sy-vline 
WA_CRM_KNVVX_STR-BOKRE sy-vline 
WA_CRM_KNVVX_STR-ANTLF sy-vline 
WA_CRM_KNVVX_STR-VWERK sy-vline 
WA_CRM_KNVVX_STR-PERRL sy-vline 
WA_CRM_KNVVX_STR-BZIRK sy-vline 
WA_CRM_KNVVX_STR-VKBUR sy-vline 
WA_CRM_KNVVX_STR-CHSPL sy-vline 
WA_CRM_KNVVX_STR-PRFRE sy-vline 
WA_CRM_KNVVX_STR-PERFK sy-vline 
WA_CRM_KNVVX_STR-VKGRP sy-vline 
WA_CRM_KNVVX_STR-VSORT sy-vline 
WA_CRM_KNVVX_STR-KZTLF sy-vline 
WA_CRM_KNVVX_STR-AWAHR sy-vline 
WA_CRM_KNVVX_STR-EIKTO sy-vline 
WA_CRM_KNVVX_STR-MRNKZ sy-vline 
WA_CRM_KNVVX_STR-VERSG sy-vline 
WA_CRM_KNVVX_STR-LOEVM sy-vline 
WA_CRM_KNVVX_STR-TASK sy-vline      INTO ld_text SEPARATED BY SPACE.

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