ABAP Select data from SAP table E1MLGNF into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP E1MLGNF 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 E1MLGNF. 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 E1MLGNF 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_E1MLGNF TYPE STANDARD TABLE OF E1MLGNF,
      WA_E1MLGNF TYPE E1MLGNF,
      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: <E1MLGNF> TYPE E1MLGNF.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E1MLGNF.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E1MLGNF
  INTO TABLE IT_E1MLGNF.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E1MLGNF
*  INTO TABLE @DATA(IT_E1MLGNF2).
*--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_E1MLGNF INDEX 1 INTO DATA(WA_E1MLGNF2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E1MLGNF ASSIGNING <E1MLGNF>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E1MLGNF>-MSGFN = 1.
<E1MLGNF>-LGNUM = 1.
<E1MLGNF>-LVORM = 1.
<E1MLGNF>-LGBKZ = 1.
<E1MLGNF>-LTKZE = 1.

ENDLOOP.

LOOP AT IT_E1MLGNF INTO WA_E1MLGNF.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E1MLGNF-LTKZA, sy-vline,
  WA_E1MLGNF-LHMG1, sy-vline,
  WA_E1MLGNF-LHMG2, sy-vline,
  WA_E1MLGNF-LHMG3, sy-vline,
  WA_E1MLGNF-LHME1, sy-vline,
  WA_E1MLGNF-LHME2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_E1MLGNF 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_E1MLGNF 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_E1MLGNF INTO WA_E1MLGNF.


*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_E1MLGNF_STR, 
MSGFN TYPE STRING,
LGNUM TYPE STRING,
LVORM TYPE STRING,
LGBKZ TYPE STRING,
LTKZE TYPE STRING,
LTKZA TYPE STRING,
LHMG1 TYPE STRING,
LHMG2 TYPE STRING,
LHMG3 TYPE STRING,
LHME1 TYPE STRING,
LHME2 TYPE STRING,
LHME3 TYPE STRING,
LETY1 TYPE STRING,
LETY2 TYPE STRING,
LETY3 TYPE STRING,
LVSME TYPE STRING,
KZZUL TYPE STRING,
BLOCK TYPE STRING,
KZMBF TYPE STRING,
BSSKZ TYPE STRING,
MKAPV TYPE STRING,
BEZME TYPE STRING,
PLKPT TYPE STRING,
VOMEM TYPE STRING,
L2SKR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_E1MLGNF_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_E1MLGNF_STR-MSGFN sy-vline 
WA_E1MLGNF_STR-LGNUM sy-vline 
WA_E1MLGNF_STR-LVORM sy-vline 
WA_E1MLGNF_STR-LGBKZ sy-vline 
WA_E1MLGNF_STR-LTKZE sy-vline 
WA_E1MLGNF_STR-LTKZA sy-vline 
WA_E1MLGNF_STR-LHMG1 sy-vline 
WA_E1MLGNF_STR-LHMG2 sy-vline 
WA_E1MLGNF_STR-LHMG3 sy-vline 
WA_E1MLGNF_STR-LHME1 sy-vline 
WA_E1MLGNF_STR-LHME2 sy-vline 
WA_E1MLGNF_STR-LHME3 sy-vline 
WA_E1MLGNF_STR-LETY1 sy-vline 
WA_E1MLGNF_STR-LETY2 sy-vline 
WA_E1MLGNF_STR-LETY3 sy-vline 
WA_E1MLGNF_STR-LVSME sy-vline 
WA_E1MLGNF_STR-KZZUL sy-vline 
WA_E1MLGNF_STR-BLOCK sy-vline 
WA_E1MLGNF_STR-KZMBF sy-vline 
WA_E1MLGNF_STR-BSSKZ sy-vline 
WA_E1MLGNF_STR-MKAPV sy-vline 
WA_E1MLGNF_STR-BEZME sy-vline 
WA_E1MLGNF_STR-PLKPT sy-vline 
WA_E1MLGNF_STR-VOMEM sy-vline 
WA_E1MLGNF_STR-L2SKR sy-vline      INTO ld_text SEPARATED BY SPACE.

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