ABAP Select data from SAP table MGV_LAMASCRLAYOU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MGV_LAMASCRLAYOU
*  INTO TABLE @DATA(IT_MGV_LAMASCRLAYOU2).
*--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_MGV_LAMASCRLAYOU INDEX 1 INTO DATA(WA_MGV_LAMASCRLAYOU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MGV_LAMASCRLAYOU>-PROG = 1.
<MGV_LAMASCRLAYOU>-DNUM = 1.
<MGV_LAMASCRLAYOU>-FNAM = 1.
<MGV_LAMASCRLAYOU>-FTYPE = 1.
<MGV_LAMASCRLAYOU>-FCOUNT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MGV_LAMASCRLAYOU-DIDX, sy-vline,
  WA_MGV_LAMASCRLAYOU-FLG1, sy-vline,
  WA_MGV_LAMASCRLAYOU-FLG2, sy-vline,
  WA_MGV_LAMASCRLAYOU-FLG3, sy-vline,
  WA_MGV_LAMASCRLAYOU-FILL, sy-vline,
  WA_MGV_LAMASCRLAYOU-FMB1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MGV_LAMASCRLAYOU 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_MGV_LAMASCRLAYOU 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_MGV_LAMASCRLAYOU INTO WA_MGV_LAMASCRLAYOU.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MGV_LAMASCRLAYOU_STR, 
PROG TYPE STRING,
DNUM TYPE STRING,
FNAM TYPE STRING,
FTYPE TYPE STRING,
FCOUNT TYPE STRING,
DIDX TYPE STRING,
FLG1 TYPE STRING,
FLG2 TYPE STRING,
FLG3 TYPE STRING,
FILL TYPE STRING,
FMB1 TYPE STRING,
FMB2 TYPE STRING,
COLR TYPE STRING,
LENG TYPE STRING,
LINE TYPE STRING,
COLN TYPE STRING,
LTYP TYPE STRING,
LANF TYPE STRING,
LBLK TYPE STRING,
LREP TYPE STRING,
FMKY TYPE STRING,
PAID TYPE STRING,
UCNV TYPE STRING,
TYPE TYPE STRING,
AUTH TYPE STRING,
WNAM TYPE STRING,
DMAC TYPE STRING,
GRP1 TYPE STRING,
GRP2 TYPE STRING,
GRP3 TYPE STRING,
GRP4 TYPE STRING,
ITYP TYPE STRING,
AGLT TYPE STRING,
ADEZ TYPE STRING,
STXT TYPE STRING,
RES1 TYPE STRING,
RES2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MGV_LAMASCRLAYOU_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_MGV_LAMASCRLAYOU_STR-PROG sy-vline 
WA_MGV_LAMASCRLAYOU_STR-DNUM sy-vline 
WA_MGV_LAMASCRLAYOU_STR-FNAM sy-vline 
WA_MGV_LAMASCRLAYOU_STR-FTYPE sy-vline 
WA_MGV_LAMASCRLAYOU_STR-FCOUNT sy-vline 
WA_MGV_LAMASCRLAYOU_STR-DIDX sy-vline 
WA_MGV_LAMASCRLAYOU_STR-FLG1 sy-vline 
WA_MGV_LAMASCRLAYOU_STR-FLG2 sy-vline 
WA_MGV_LAMASCRLAYOU_STR-FLG3 sy-vline 
WA_MGV_LAMASCRLAYOU_STR-FILL sy-vline 
WA_MGV_LAMASCRLAYOU_STR-FMB1 sy-vline 
WA_MGV_LAMASCRLAYOU_STR-FMB2 sy-vline 
WA_MGV_LAMASCRLAYOU_STR-COLR sy-vline 
WA_MGV_LAMASCRLAYOU_STR-LENG sy-vline 
WA_MGV_LAMASCRLAYOU_STR-LINE sy-vline 
WA_MGV_LAMASCRLAYOU_STR-COLN sy-vline 
WA_MGV_LAMASCRLAYOU_STR-LTYP sy-vline 
WA_MGV_LAMASCRLAYOU_STR-LANF sy-vline 
WA_MGV_LAMASCRLAYOU_STR-LBLK sy-vline 
WA_MGV_LAMASCRLAYOU_STR-LREP sy-vline 
WA_MGV_LAMASCRLAYOU_STR-FMKY sy-vline 
WA_MGV_LAMASCRLAYOU_STR-PAID sy-vline 
WA_MGV_LAMASCRLAYOU_STR-UCNV sy-vline 
WA_MGV_LAMASCRLAYOU_STR-TYPE sy-vline 
WA_MGV_LAMASCRLAYOU_STR-AUTH sy-vline 
WA_MGV_LAMASCRLAYOU_STR-WNAM sy-vline 
WA_MGV_LAMASCRLAYOU_STR-DMAC sy-vline 
WA_MGV_LAMASCRLAYOU_STR-GRP1 sy-vline 
WA_MGV_LAMASCRLAYOU_STR-GRP2 sy-vline 
WA_MGV_LAMASCRLAYOU_STR-GRP3 sy-vline 
WA_MGV_LAMASCRLAYOU_STR-GRP4 sy-vline 
WA_MGV_LAMASCRLAYOU_STR-ITYP sy-vline 
WA_MGV_LAMASCRLAYOU_STR-AGLT sy-vline 
WA_MGV_LAMASCRLAYOU_STR-ADEZ sy-vline 
WA_MGV_LAMASCRLAYOU_STR-STXT sy-vline 
WA_MGV_LAMASCRLAYOU_STR-RES1 sy-vline 
WA_MGV_LAMASCRLAYOU_STR-RES2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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