ABAP Select data from SAP table E3MLGNM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP E3MLGNM 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 E3MLGNM. 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 E3MLGNM 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_E3MLGNM TYPE STANDARD TABLE OF E3MLGNM,
      WA_E3MLGNM TYPE E3MLGNM,
      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: <E3MLGNM> TYPE E3MLGNM.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E3MLGNM.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E3MLGNM
  INTO TABLE IT_E3MLGNM.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E3MLGNM
*  INTO TABLE @DATA(IT_E3MLGNM2).
*--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_E3MLGNM INDEX 1 INTO DATA(WA_E3MLGNM2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E3MLGNM ASSIGNING <E3MLGNM>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E3MLGNM>-MSGFN = 1.
<E3MLGNM>-LGNUM = 1.
<E3MLGNM>-LVORM = 1.
<E3MLGNM>-LGBKZ = 1.
<E3MLGNM>-LTKZE = 1.

ENDLOOP.

LOOP AT IT_E3MLGNM INTO WA_E3MLGNM.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E3MLGNM-LTKZA, sy-vline,
  WA_E3MLGNM-LHMG1, sy-vline,
  WA_E3MLGNM-LHMG2, sy-vline,
  WA_E3MLGNM-LHMG3, sy-vline,
  WA_E3MLGNM-LHME1, sy-vline,
  WA_E3MLGNM-LHME2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_E3MLGNM 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_E3MLGNM 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_E3MLGNM INTO WA_E3MLGNM.


*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 CUNIT, internal->external for field LHME1
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_E3MLGNM-LHME1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_E3MLGNM-LHME1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field LHME2
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_E3MLGNM-LHME2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_E3MLGNM-LHME2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field LHME3
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_E3MLGNM-LHME3
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_E3MLGNM-LHME3.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field LVSME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_E3MLGNM-LVSME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_E3MLGNM-LVSME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BEZME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_E3MLGNM-BEZME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_E3MLGNM-BEZME.
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_E3MLGNM_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_E3MLGNM_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_E3MLGNM_STR-MSGFN sy-vline 
WA_E3MLGNM_STR-LGNUM sy-vline 
WA_E3MLGNM_STR-LVORM sy-vline 
WA_E3MLGNM_STR-LGBKZ sy-vline 
WA_E3MLGNM_STR-LTKZE sy-vline 
WA_E3MLGNM_STR-LTKZA sy-vline 
WA_E3MLGNM_STR-LHMG1 sy-vline 
WA_E3MLGNM_STR-LHMG2 sy-vline 
WA_E3MLGNM_STR-LHMG3 sy-vline 
WA_E3MLGNM_STR-LHME1 sy-vline 
WA_E3MLGNM_STR-LHME2 sy-vline 
WA_E3MLGNM_STR-LHME3 sy-vline 
WA_E3MLGNM_STR-LETY1 sy-vline 
WA_E3MLGNM_STR-LETY2 sy-vline 
WA_E3MLGNM_STR-LETY3 sy-vline 
WA_E3MLGNM_STR-LVSME sy-vline 
WA_E3MLGNM_STR-KZZUL sy-vline 
WA_E3MLGNM_STR-BLOCK sy-vline 
WA_E3MLGNM_STR-KZMBF sy-vline 
WA_E3MLGNM_STR-BSSKZ sy-vline 
WA_E3MLGNM_STR-MKAPV sy-vline 
WA_E3MLGNM_STR-BEZME sy-vline 
WA_E3MLGNM_STR-PLKPT sy-vline 
WA_E3MLGNM_STR-VOMEM sy-vline 
WA_E3MLGNM_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.