ABAP Select data from SAP table MDLA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDLA
*  INTO TABLE @DATA(IT_MDLA2).
*--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_MDLA INDEX 1 INTO DATA(WA_MDLA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDLA>-MANDT = 1.
<MDLA>-EBELN = 1.
<MDLA>-EBELP = 1.
<MDLA>-ETENS = 1.
<MDLA>-MATNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDLA-WERKS, sy-vline,
  WA_MDLA-LGORT, sy-vline,
  WA_MDLA-BSTYP, sy-vline,
  WA_MDLA-LOEKZ, sy-vline,
  WA_MDLA-ELIKZ, sy-vline,
  WA_MDLA-MEINS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDLA 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_MDLA 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_MDLA INTO WA_MDLA.


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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MDLA-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDLA-MATNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit NUMCV, internal->external for field REVLV
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MDLA-REVLV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDLA-REVLV.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDLA-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDLA-VBELN.
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_MDLA_STR, 
MANDT TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
ETENS TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
BSTYP TYPE STRING,
LOEKZ TYPE STRING,
ELIKZ TYPE STRING,
MEINS TYPE STRING,
UMREZ TYPE STRING,
UMREN TYPE STRING,
WEBAZ TYPE STRING,
PSTYP TYPE STRING,
KNTTP TYPE STRING,
SOBKZ TYPE STRING,
KZVBR TYPE STRING,
EINDT TYPE STRING,
UZEIT TYPE STRING,
MENGE TYPE STRING,
DABMG TYPE STRING,
ESTKZ TYPE STRING,
KZDIS TYPE STRING,
BBLOE TYPE STRING,
BWTAR TYPE STRING,
KZBWS TYPE STRING,
REVLV TYPE STRING,
EMLIF TYPE STRING,
LBLKZ TYPE STRING,
STATU TYPE STRING,
BERID TYPE STRING,
ARSNR TYPE STRING,
ARSPS TYPE STRING,
INSMK TYPE STRING,
RESLO TYPE STRING,
CHARG TYPE STRING,
UPTYP TYPE STRING,
FLS_RSTO TYPE STRING,
ITCONS TYPE STRING,
SGT_SCAT TYPE STRING,
STAPO TYPE STRING,
IMWRK TYPE STRING,
VBELN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDLA_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_MDLA_STR-MANDT sy-vline 
WA_MDLA_STR-EBELN sy-vline 
WA_MDLA_STR-EBELP sy-vline 
WA_MDLA_STR-ETENS sy-vline 
WA_MDLA_STR-MATNR sy-vline 
WA_MDLA_STR-WERKS sy-vline 
WA_MDLA_STR-LGORT sy-vline 
WA_MDLA_STR-BSTYP sy-vline 
WA_MDLA_STR-LOEKZ sy-vline 
WA_MDLA_STR-ELIKZ sy-vline 
WA_MDLA_STR-MEINS sy-vline 
WA_MDLA_STR-UMREZ sy-vline 
WA_MDLA_STR-UMREN sy-vline 
WA_MDLA_STR-WEBAZ sy-vline 
WA_MDLA_STR-PSTYP sy-vline 
WA_MDLA_STR-KNTTP sy-vline 
WA_MDLA_STR-SOBKZ sy-vline 
WA_MDLA_STR-KZVBR sy-vline 
WA_MDLA_STR-EINDT sy-vline 
WA_MDLA_STR-UZEIT sy-vline 
WA_MDLA_STR-MENGE sy-vline 
WA_MDLA_STR-DABMG sy-vline 
WA_MDLA_STR-ESTKZ sy-vline 
WA_MDLA_STR-KZDIS sy-vline 
WA_MDLA_STR-BBLOE sy-vline 
WA_MDLA_STR-BWTAR sy-vline 
WA_MDLA_STR-KZBWS sy-vline 
WA_MDLA_STR-REVLV sy-vline 
WA_MDLA_STR-EMLIF sy-vline 
WA_MDLA_STR-LBLKZ sy-vline 
WA_MDLA_STR-STATU sy-vline 
WA_MDLA_STR-BERID sy-vline 
WA_MDLA_STR-ARSNR sy-vline 
WA_MDLA_STR-ARSPS sy-vline 
WA_MDLA_STR-INSMK sy-vline 
WA_MDLA_STR-RESLO sy-vline 
WA_MDLA_STR-CHARG sy-vline 
WA_MDLA_STR-UPTYP sy-vline 
WA_MDLA_STR-FLS_RSTO sy-vline 
WA_MDLA_STR-ITCONS sy-vline 
WA_MDLA_STR-SGT_SCAT sy-vline 
WA_MDLA_STR-STAPO sy-vline 
WA_MDLA_STR-IMWRK sy-vline 
WA_MDLA_STR-VBELN sy-vline      INTO ld_text SEPARATED BY SPACE.

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