ABAP Select data from SAP table MLITMB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MLITMB
*  INTO TABLE @DATA(IT_MLITMB2).
*--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_MLITMB INDEX 1 INTO DATA(WA_MLITMB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MLITMB>-MANDT = 1.
<MLITMB>-BELNR = 1.
<MLITMB>-KJAHR = 1.
<MLITMB>-POSNR = 1.
<MLITMB>-MBLNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MLITMB-MJAHR, sy-vline,
  WA_MLITMB-M_ZEILE, sy-vline,
  WA_MLITMB-M_AWSYS, sy-vline,
  WA_MLITMB-BLART, sy-vline,
  WA_MLITMB-KZBEW, sy-vline,
  WA_MLITMB-KZVBR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MLITMB 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_MLITMB 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_MLITMB INTO WA_MLITMB.


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

*Conversion exit GJAHR, internal->external for field KJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MLITMB-KJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLITMB-KJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MLITMB-MBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLITMB-MBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MLITMB-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLITMB-MJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field M_AWSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MLITMB-M_AWSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLITMB-M_AWSYS.
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_MLITMB_STR, 
MANDT TYPE STRING,
BELNR TYPE STRING,
KJAHR TYPE STRING,
POSNR TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,
M_ZEILE TYPE STRING,
M_AWSYS TYPE STRING,
BLART TYPE STRING,
KZBEW TYPE STRING,
KZVBR TYPE STRING,
MENGU TYPE STRING,
WERTU TYPE STRING,
WEUNB TYPE STRING,
ZEKKN TYPE STRING,
BUSTW TYPE STRING,
BWART TYPE STRING,
EBELP TYPE STRING,
KDPOS TYPE STRING,
AUFPS TYPE STRING,
MLCONR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MLITMB_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_MLITMB_STR-MANDT sy-vline 
WA_MLITMB_STR-BELNR sy-vline 
WA_MLITMB_STR-KJAHR sy-vline 
WA_MLITMB_STR-POSNR sy-vline 
WA_MLITMB_STR-MBLNR sy-vline 
WA_MLITMB_STR-MJAHR sy-vline 
WA_MLITMB_STR-M_ZEILE sy-vline 
WA_MLITMB_STR-M_AWSYS sy-vline 
WA_MLITMB_STR-BLART sy-vline 
WA_MLITMB_STR-KZBEW sy-vline 
WA_MLITMB_STR-KZVBR sy-vline 
WA_MLITMB_STR-MENGU sy-vline 
WA_MLITMB_STR-WERTU sy-vline 
WA_MLITMB_STR-WEUNB sy-vline 
WA_MLITMB_STR-ZEKKN sy-vline 
WA_MLITMB_STR-BUSTW sy-vline 
WA_MLITMB_STR-BWART sy-vline 
WA_MLITMB_STR-EBELP sy-vline 
WA_MLITMB_STR-KDPOS sy-vline 
WA_MLITMB_STR-AUFPS sy-vline 
WA_MLITMB_STR-MLCONR sy-vline      INTO ld_text SEPARATED BY SPACE.

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