ABAP Select data from SAP table LXVASM_LVVTO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LXVASM_LVVTO
*  INTO TABLE @DATA(IT_LXVASM_LVVTO2).
*--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_LXVASM_LVVTO INDEX 1 INTO DATA(WA_LXVASM_LVVTO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LXVASM_LVVTO>-TANUM = 1.
<LXVASM_LVVTO>-TAPOS = 1.
<LXVASM_LVVTO>-VLTYP = 1.
<LXVASM_LVVTO>-VLBER = 1.
<LXVASM_LVVTO>-VLPLA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LXVASM_LVVTO-NLTYP, sy-vline,
  WA_LXVASM_LVVTO-NLBER, sy-vline,
  WA_LXVASM_LVVTO-NLPLA, sy-vline,
  WA_LXVASM_LVVTO-VORID, sy-vline,
  WA_LXVASM_LVVTO-STORD, sy-vline,
  WA_LXVASM_LVVTO-DOCNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LXVASM_LVVTO 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_LXVASM_LVVTO 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_LXVASM_LVVTO INTO WA_LXVASM_LVVTO.


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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_LXVASM_LVVTO-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LXVASM_LVVTO-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_LXVASM_LVVTO_STR, 
TANUM TYPE STRING,
TAPOS TYPE STRING,
VLTYP TYPE STRING,
VLBER TYPE STRING,
VLPLA TYPE STRING,
NLTYP TYPE STRING,
NLBER TYPE STRING,
NLPLA TYPE STRING,
VORID TYPE STRING,
STORD TYPE STRING,
DOCNR TYPE STRING,
MATNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LXVASM_LVVTO_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_LXVASM_LVVTO_STR-TANUM sy-vline 
WA_LXVASM_LVVTO_STR-TAPOS sy-vline 
WA_LXVASM_LVVTO_STR-VLTYP sy-vline 
WA_LXVASM_LVVTO_STR-VLBER sy-vline 
WA_LXVASM_LVVTO_STR-VLPLA sy-vline 
WA_LXVASM_LVVTO_STR-NLTYP sy-vline 
WA_LXVASM_LVVTO_STR-NLBER sy-vline 
WA_LXVASM_LVVTO_STR-NLPLA sy-vline 
WA_LXVASM_LVVTO_STR-VORID sy-vline 
WA_LXVASM_LVVTO_STR-STORD sy-vline 
WA_LXVASM_LVVTO_STR-DOCNR sy-vline 
WA_LXVASM_LVVTO_STR-MATNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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