ABAP Select data from SAP table MVAL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MVAL
*  INTO TABLE @DATA(IT_MVAL2).
*--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_MVAL INDEX 1 INTO DATA(WA_MVAL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MVAL>-ABCIW = 1.
<MVAL>-BKLAS = 1.
<MVAL>-BWKEY = 1.
<MVAL>-BWSPA = 1.
<MVAL>-BWTAR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MVAL-BWTTY, sy-vline,
  WA_MVAL-EKALR, sy-vline,
  WA_MVAL-EKLAS, sy-vline,
  WA_MVAL-HKMAT, sy-vline,
  WA_MVAL-HRKFT, sy-vline,
  WA_MVAL-KALN1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MVAL 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_MVAL 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_MVAL INTO WA_MVAL.


*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 GJAHR, internal->external for field LFGJA
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MVAL-LFGJA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MVAL-LFGJA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MVAL-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MVAL-MATNR.
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_MVAL_STR, 
ABCIW TYPE STRING,
BKLAS TYPE STRING,
BWKEY TYPE STRING,
BWSPA TYPE STRING,
BWTAR TYPE STRING,
BWTTY TYPE STRING,
EKALR TYPE STRING,
EKLAS TYPE STRING,
HKMAT TYPE STRING,
HRKFT TYPE STRING,
KALN1 TYPE STRING,
KALNR TYPE STRING,
KZIWL TYPE STRING,
LBKUM TYPE STRING,
LFGJA TYPE STRING,
LFMON TYPE STRING,
LVORM TYPE STRING,
MATNR TYPE STRING,
MBRUE TYPE STRING,
MLAST TYPE STRING,
MLMAA TYPE STRING,
OKLAS TYPE STRING,
PEINH TYPE STRING,
PSTAT TYPE STRING,
QKLAS TYPE STRING,
SALK3 TYPE STRING,
SALKV TYPE STRING,
SPERW TYPE STRING,
STPRS TYPE STRING,
VERPR TYPE STRING,
VKSAL TYPE STRING,
VMBKL TYPE STRING,
VMKUM TYPE STRING,
VMPEI TYPE STRING,
VMSAL TYPE STRING,
VMSAV TYPE STRING,
VMSTP TYPE STRING,
VMVER TYPE STRING,
VMVKS TYPE STRING,
VMVPR TYPE STRING,
VPRSV TYPE STRING,
WLINL TYPE STRING,
XBEWM TYPE STRING,
XLIFO TYPE STRING,
OIPPINV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MVAL_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_MVAL_STR-ABCIW sy-vline 
WA_MVAL_STR-BKLAS sy-vline 
WA_MVAL_STR-BWKEY sy-vline 
WA_MVAL_STR-BWSPA sy-vline 
WA_MVAL_STR-BWTAR sy-vline 
WA_MVAL_STR-BWTTY sy-vline 
WA_MVAL_STR-EKALR sy-vline 
WA_MVAL_STR-EKLAS sy-vline 
WA_MVAL_STR-HKMAT sy-vline 
WA_MVAL_STR-HRKFT sy-vline 
WA_MVAL_STR-KALN1 sy-vline 
WA_MVAL_STR-KALNR sy-vline 
WA_MVAL_STR-KZIWL sy-vline 
WA_MVAL_STR-LBKUM sy-vline 
WA_MVAL_STR-LFGJA sy-vline 
WA_MVAL_STR-LFMON sy-vline 
WA_MVAL_STR-LVORM sy-vline 
WA_MVAL_STR-MATNR sy-vline 
WA_MVAL_STR-MBRUE sy-vline 
WA_MVAL_STR-MLAST sy-vline 
WA_MVAL_STR-MLMAA sy-vline 
WA_MVAL_STR-OKLAS sy-vline 
WA_MVAL_STR-PEINH sy-vline 
WA_MVAL_STR-PSTAT sy-vline 
WA_MVAL_STR-QKLAS sy-vline 
WA_MVAL_STR-SALK3 sy-vline 
WA_MVAL_STR-SALKV sy-vline 
WA_MVAL_STR-SPERW sy-vline 
WA_MVAL_STR-STPRS sy-vline 
WA_MVAL_STR-VERPR sy-vline 
WA_MVAL_STR-VKSAL sy-vline 
WA_MVAL_STR-VMBKL sy-vline 
WA_MVAL_STR-VMKUM sy-vline 
WA_MVAL_STR-VMPEI sy-vline 
WA_MVAL_STR-VMSAL sy-vline 
WA_MVAL_STR-VMSAV sy-vline 
WA_MVAL_STR-VMSTP sy-vline 
WA_MVAL_STR-VMVER sy-vline 
WA_MVAL_STR-VMVKS sy-vline 
WA_MVAL_STR-VMVPR sy-vline 
WA_MVAL_STR-VPRSV sy-vline 
WA_MVAL_STR-WLINL sy-vline 
WA_MVAL_STR-XBEWM sy-vline 
WA_MVAL_STR-XLIFO sy-vline 
WA_MVAL_STR-OIPPINV sy-vline      INTO ld_text SEPARATED BY SPACE.

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