ABAP Select data from SAP table E2MLGNM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP E2MLGNM 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 E2MLGNM. 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 E2MLGNM 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_E2MLGNM TYPE STANDARD TABLE OF E2MLGNM,
      WA_E2MLGNM TYPE E2MLGNM,
      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: <E2MLGNM> TYPE E2MLGNM.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E2MLGNM.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E2MLGNM
  INTO TABLE IT_E2MLGNM.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E2MLGNM
*  INTO TABLE @DATA(IT_E2MLGNM2).
*--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_E2MLGNM INDEX 1 INTO DATA(WA_E2MLGNM2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E2MLGNM ASSIGNING <E2MLGNM>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E2MLGNM>-MSGFN = 1.
<E2MLGNM>-LGNUM = 1.
<E2MLGNM>-LVORM = 1.
<E2MLGNM>-LGBKZ = 1.
<E2MLGNM>-LTKZE = 1.

ENDLOOP.

LOOP AT IT_E2MLGNM INTO WA_E2MLGNM.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E2MLGNM-LTKZA, sy-vline,
  WA_E2MLGNM-LHMG1, sy-vline,
  WA_E2MLGNM-LHMG2, sy-vline,
  WA_E2MLGNM-LHMG3, sy-vline,
  WA_E2MLGNM-LHME1, sy-vline,
  WA_E2MLGNM-LHME2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_E2MLGNM 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_E2MLGNM 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_E2MLGNM INTO WA_E2MLGNM.


*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_E2MLGNM_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,END OF T_EKKO_STR.
DATA: WA_E2MLGNM_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_E2MLGNM_STR-MSGFN sy-vline 
WA_E2MLGNM_STR-LGNUM sy-vline 
WA_E2MLGNM_STR-LVORM sy-vline 
WA_E2MLGNM_STR-LGBKZ sy-vline 
WA_E2MLGNM_STR-LTKZE sy-vline 
WA_E2MLGNM_STR-LTKZA sy-vline 
WA_E2MLGNM_STR-LHMG1 sy-vline 
WA_E2MLGNM_STR-LHMG2 sy-vline 
WA_E2MLGNM_STR-LHMG3 sy-vline 
WA_E2MLGNM_STR-LHME1 sy-vline 
WA_E2MLGNM_STR-LHME2 sy-vline 
WA_E2MLGNM_STR-LHME3 sy-vline 
WA_E2MLGNM_STR-LETY1 sy-vline 
WA_E2MLGNM_STR-LETY2 sy-vline 
WA_E2MLGNM_STR-LETY3 sy-vline 
WA_E2MLGNM_STR-LVSME sy-vline 
WA_E2MLGNM_STR-KZZUL sy-vline 
WA_E2MLGNM_STR-BLOCK sy-vline 
WA_E2MLGNM_STR-KZMBF sy-vline 
WA_E2MLGNM_STR-BSSKZ sy-vline 
WA_E2MLGNM_STR-MKAPV sy-vline 
WA_E2MLGNM_STR-BEZME sy-vline      INTO ld_text SEPARATED BY SPACE.

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