ABAP Select data from SAP table MDLP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDLP
*  INTO TABLE @DATA(IT_MDLP2).
*--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_MDLP INDEX 1 INTO DATA(WA_MDLP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDLP>-VSTAT = 1.
<MDLP>-DELNR = 1.
<MDLP>-DELPS = 1.
<MDLP>-DELET = 1.
<MDLP>-MNG01 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDLP-DAT01, sy-vline,
  WA_MDLP-QUNUM, sy-vline,
  WA_MDLP-QUPOS, sy-vline,
  WA_MDLP-MGALT, sy-vline,
  WA_MDLP-DTALT, sy-vline,
  WA_MDLP-MAXET, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDLP 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_MDLP 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_MDLP INTO WA_MDLP.


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

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

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

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

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDLP-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDLP-LIFNR.
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_MDLP_STR, 
VSTAT TYPE STRING,
DELNR TYPE STRING,
DELPS TYPE STRING,
DELET TYPE STRING,
MNG01 TYPE STRING,
DAT01 TYPE STRING,
QUNUM TYPE STRING,
QUPOS TYPE STRING,
MGALT TYPE STRING,
DTALT TYPE STRING,
MAXET TYPE STRING,
RSNUM TYPE STRING,
SERNR TYPE STRING,
PALTR TYPE STRING,
AENNR TYPE STRING,
STLAN TYPE STRING,
STALT TYPE STRING,
UMREN TYPE STRING,
UMREZ TYPE STRING,
MEINS TYPE STRING,
AMENG TYPE STRING,
BEDAT TYPE STRING,
GLMNG TYPE STRING,
FIXKZ TYPE STRING,
VERID TYPE STRING,
LIFNR TYPE STRING,
WAMNG TYPE STRING,
DINDX TYPE STRING,
LPEIN TYPE STRING,
UZEIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDLP_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_MDLP_STR-VSTAT sy-vline 
WA_MDLP_STR-DELNR sy-vline 
WA_MDLP_STR-DELPS sy-vline 
WA_MDLP_STR-DELET sy-vline 
WA_MDLP_STR-MNG01 sy-vline 
WA_MDLP_STR-DAT01 sy-vline 
WA_MDLP_STR-QUNUM sy-vline 
WA_MDLP_STR-QUPOS sy-vline 
WA_MDLP_STR-MGALT sy-vline 
WA_MDLP_STR-DTALT sy-vline 
WA_MDLP_STR-MAXET sy-vline 
WA_MDLP_STR-RSNUM sy-vline 
WA_MDLP_STR-SERNR sy-vline 
WA_MDLP_STR-PALTR sy-vline 
WA_MDLP_STR-AENNR sy-vline 
WA_MDLP_STR-STLAN sy-vline 
WA_MDLP_STR-STALT sy-vline 
WA_MDLP_STR-UMREN sy-vline 
WA_MDLP_STR-UMREZ sy-vline 
WA_MDLP_STR-MEINS sy-vline 
WA_MDLP_STR-AMENG sy-vline 
WA_MDLP_STR-BEDAT sy-vline 
WA_MDLP_STR-GLMNG sy-vline 
WA_MDLP_STR-FIXKZ sy-vline 
WA_MDLP_STR-VERID sy-vline 
WA_MDLP_STR-LIFNR sy-vline 
WA_MDLP_STR-WAMNG sy-vline 
WA_MDLP_STR-DINDX sy-vline 
WA_MDLP_STR-LPEIN sy-vline 
WA_MDLP_STR-UZEIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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