ABAP Select data from SAP table MARV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MARV
*  INTO TABLE @DATA(IT_MARV2).
*--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_MARV INDEX 1 INTO DATA(WA_MARV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MARV>-MANDT = 1.
<MARV>-BUKRS = 1.
<MARV>-LFGJA = 1.
<MARV>-LFMON = 1.
<MARV>-VMGJA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MARV-VMMON, sy-vline,
  WA_MARV-VJGJA, sy-vline,
  WA_MARV-VJMON, sy-vline,
  WA_MARV-XRUEM, sy-vline,
  WA_MARV-XRUEV, sy-vline,
  WA_MARV-AENAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MARV 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_MARV 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_MARV INTO WA_MARV.


*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_MARV-LFGJA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MARV-LFGJA.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit GJAHR, internal->external for field GJA_40C
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MARV-GJA_40C
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MARV-GJA_40C.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJA_46C
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MARV-GJA_46C
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MARV-GJA_46C.
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_MARV_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
LFGJA TYPE STRING,
LFMON TYPE STRING,
VMGJA TYPE STRING,
VMMON TYPE STRING,
VJGJA TYPE STRING,
VJMON TYPE STRING,
XRUEM TYPE STRING,
XRUEV TYPE STRING,
AENAM TYPE STRING,
LAEDA TYPE STRING,
UZEIT TYPE STRING,
KZINV TYPE STRING,
VVMGJ TYPE STRING,
VVMMO TYPE STRING,
VVJGJ TYPE STRING,
VVJMO TYPE STRING,
GJA_40C TYPE STRING,
MON_40C TYPE STRING,
GJA_46C TYPE STRING,
MON_46C TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MARV_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_MARV_STR-MANDT sy-vline 
WA_MARV_STR-BUKRS sy-vline 
WA_MARV_STR-LFGJA sy-vline 
WA_MARV_STR-LFMON sy-vline 
WA_MARV_STR-VMGJA sy-vline 
WA_MARV_STR-VMMON sy-vline 
WA_MARV_STR-VJGJA sy-vline 
WA_MARV_STR-VJMON sy-vline 
WA_MARV_STR-XRUEM sy-vline 
WA_MARV_STR-XRUEV sy-vline 
WA_MARV_STR-AENAM sy-vline 
WA_MARV_STR-LAEDA sy-vline 
WA_MARV_STR-UZEIT sy-vline 
WA_MARV_STR-KZINV sy-vline 
WA_MARV_STR-VVMGJ sy-vline 
WA_MARV_STR-VVMMO sy-vline 
WA_MARV_STR-VVJGJ sy-vline 
WA_MARV_STR-VVJMO sy-vline 
WA_MARV_STR-GJA_40C sy-vline 
WA_MARV_STR-MON_40C sy-vline 
WA_MARV_STR-GJA_46C sy-vline 
WA_MARV_STR-MON_46C sy-vline      INTO ld_text SEPARATED BY SPACE.

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