ABAP Select data from SAP table MCVBKAB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCVBKAB
*  INTO TABLE @DATA(IT_MCVBKAB2).
*--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_MCVBKAB INDEX 1 INTO DATA(WA_MCVBKAB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCVBKAB>-SUPKZ = 1.
<MCVBKAB>-MANDT = 1.
<MCVBKAB>-VBELN = 1.
<MCVBKAB>-TRVOG = 1.
<MCVBKAB>-VKORG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCVBKAB-VTWEG, sy-vline,
  WA_MCVBKAB-SPART, sy-vline,
  WA_MCVBKAB-VKBUR, sy-vline,
  WA_MCVBKAB-VKGRP, sy-vline,
  WA_MCVBKAB-ERDAT, sy-vline,
  WA_MCVBKAB-KTABG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCVBKAB 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_MCVBKAB 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_MCVBKAB INTO WA_MCVBKAB.


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

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

*Conversion exit PARVW, internal->external for field PARVW
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_MCVBKAB-PARVW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCVBKAB-PARVW.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field PKUNWE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCVBKAB-PKUNWE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCVBKAB-PKUNWE.
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_MCVBKAB_STR, 
SUPKZ TYPE STRING,
MANDT TYPE STRING,
VBELN TYPE STRING,
TRVOG TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
VKBUR TYPE STRING,
VKGRP TYPE STRING,
ERDAT TYPE STRING,
KTABG TYPE STRING,
KTAAR TYPE STRING,
KTAST TYPE STRING,
KTAGR TYPE STRING,
KTAER TYPE STRING,
KTAEB TYPE STRING,
KTA01 TYPE STRING,
KTA02 TYPE STRING,
KTA03 TYPE STRING,
KTA04 TYPE STRING,
KTA05 TYPE STRING,
KTA06 TYPE STRING,
KTA07 TYPE STRING,
KTA08 TYPE STRING,
KTA09 TYPE STRING,
KTA10 TYPE STRING,
KUNNR TYPE STRING,
PARVW TYPE STRING,
DIRECTION TYPE STRING,
STAFO TYPE STRING,
VBKA_DUMMY TYPE STRING,
PKUNAG TYPE STRING,
PKUNWE TYPE STRING,
PARZM TYPE STRING,
PARVE TYPE STRING,
PARNR_AP TYPE STRING,
PDUMMY TYPE STRING,
VBTYP TYPE STRING,
CNT_CAS TYPE STRING,
BUKRS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCVBKAB_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_MCVBKAB_STR-SUPKZ sy-vline 
WA_MCVBKAB_STR-MANDT sy-vline 
WA_MCVBKAB_STR-VBELN sy-vline 
WA_MCVBKAB_STR-TRVOG sy-vline 
WA_MCVBKAB_STR-VKORG sy-vline 
WA_MCVBKAB_STR-VTWEG sy-vline 
WA_MCVBKAB_STR-SPART sy-vline 
WA_MCVBKAB_STR-VKBUR sy-vline 
WA_MCVBKAB_STR-VKGRP sy-vline 
WA_MCVBKAB_STR-ERDAT sy-vline 
WA_MCVBKAB_STR-KTABG sy-vline 
WA_MCVBKAB_STR-KTAAR sy-vline 
WA_MCVBKAB_STR-KTAST sy-vline 
WA_MCVBKAB_STR-KTAGR sy-vline 
WA_MCVBKAB_STR-KTAER sy-vline 
WA_MCVBKAB_STR-KTAEB sy-vline 
WA_MCVBKAB_STR-KTA01 sy-vline 
WA_MCVBKAB_STR-KTA02 sy-vline 
WA_MCVBKAB_STR-KTA03 sy-vline 
WA_MCVBKAB_STR-KTA04 sy-vline 
WA_MCVBKAB_STR-KTA05 sy-vline 
WA_MCVBKAB_STR-KTA06 sy-vline 
WA_MCVBKAB_STR-KTA07 sy-vline 
WA_MCVBKAB_STR-KTA08 sy-vline 
WA_MCVBKAB_STR-KTA09 sy-vline 
WA_MCVBKAB_STR-KTA10 sy-vline 
WA_MCVBKAB_STR-KUNNR sy-vline 
WA_MCVBKAB_STR-PARVW sy-vline 
WA_MCVBKAB_STR-DIRECTION sy-vline 
WA_MCVBKAB_STR-STAFO sy-vline 
WA_MCVBKAB_STR-VBKA_DUMMY sy-vline 
WA_MCVBKAB_STR-PKUNAG sy-vline 
WA_MCVBKAB_STR-PKUNWE sy-vline 
WA_MCVBKAB_STR-PARZM sy-vline 
WA_MCVBKAB_STR-PARVE sy-vline 
WA_MCVBKAB_STR-PARNR_AP sy-vline 
WA_MCVBKAB_STR-PDUMMY sy-vline 
WA_MCVBKAB_STR-VBTYP sy-vline 
WA_MCVBKAB_STR-CNT_CAS sy-vline 
WA_MCVBKAB_STR-BUKRS sy-vline      INTO ld_text SEPARATED BY SPACE.

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