ABAP Select data from SAP table LIST_MV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LIST_MV
*  INTO TABLE @DATA(IT_LIST_MV2).
*--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_LIST_MV INDEX 1 INTO DATA(WA_LIST_MV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LIST_MV>-SEL_ID = 1.
<LIST_MV>-TEXT = 1.
<LIST_MV>-DEVCLASS = 1.
<LIST_MV>-FSTUSER = 1.
<LIST_MV>-FSTDATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LIST_MV-FSTTIME, sy-vline,
  WA_LIST_MV-LSTUSER, sy-vline,
  WA_LIST_MV-LSTDATE, sy-vline,
  WA_LIST_MV-LSTTIME, sy-vline,
  WA_LIST_MV-COMP_OBJ, sy-vline,
  WA_LIST_MV-RELE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LIST_MV 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_LIST_MV 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_LIST_MV INTO WA_LIST_MV.


*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 RELE, internal->external for field RELE
CALL FUNCTION 'CONVERSION_EXIT_RELE_OUTPUT'
  EXPORTING
    input =                      WA_LIST_MV-RELE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LIST_MV-RELE.
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_LIST_MV_STR, 
SEL_ID TYPE STRING,
TEXT TYPE STRING,
DEVCLASS TYPE STRING,
FSTUSER TYPE STRING,
FSTDATE TYPE STRING,
FSTTIME TYPE STRING,
LSTUSER TYPE STRING,
LSTDATE TYPE STRING,
LSTTIME TYPE STRING,
COMP_OBJ TYPE STRING,
RELE TYPE STRING,
IDENT TYPE STRING,
VARI_TYPE TYPE STRING,
STATUS TYPE STRING,
ONLZ TYPE STRING,
BATZ TYPE STRING,
AUTZ TYPE STRING,
MANU TYPE STRING,
TSTAMP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LIST_MV_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_LIST_MV_STR-SEL_ID sy-vline 
WA_LIST_MV_STR-TEXT sy-vline 
WA_LIST_MV_STR-DEVCLASS sy-vline 
WA_LIST_MV_STR-FSTUSER sy-vline 
WA_LIST_MV_STR-FSTDATE sy-vline 
WA_LIST_MV_STR-FSTTIME sy-vline 
WA_LIST_MV_STR-LSTUSER sy-vline 
WA_LIST_MV_STR-LSTDATE sy-vline 
WA_LIST_MV_STR-LSTTIME sy-vline 
WA_LIST_MV_STR-COMP_OBJ sy-vline 
WA_LIST_MV_STR-RELE sy-vline 
WA_LIST_MV_STR-IDENT sy-vline 
WA_LIST_MV_STR-VARI_TYPE sy-vline 
WA_LIST_MV_STR-STATUS sy-vline 
WA_LIST_MV_STR-ONLZ sy-vline 
WA_LIST_MV_STR-BATZ sy-vline 
WA_LIST_MV_STR-AUTZ sy-vline 
WA_LIST_MV_STR-MANU sy-vline 
WA_LIST_MV_STR-TSTAMP sy-vline      INTO ld_text SEPARATED BY SPACE.

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