ABAP Select data from SAP table MLPP into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MLPP
*  INTO TABLE @DATA(IT_MLPP2).
*--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_MLPP INDEX 1 INTO DATA(WA_MLPP2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MLPP-POPER, sy-vline,
  WA_MLPP-BUDAT, sy-vline,
  WA_MLPP-PERART, sy-vline,
  WA_MLPP-LBKUM, sy-vline,
  WA_MLPP-LBKUM_OLD, sy-vline,
  WA_MLPP-UNTPER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MLPP 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_MLPP 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_MLPP INTO WA_MLPP.


*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_MLPP-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLPP-BELNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GJAHR, internal->external for field BDATJ
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MLPP-BDATJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLPP-BDATJ.
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_MLPP_STR, 
MANDT TYPE STRING,
BELNR TYPE STRING,
KJAHR TYPE STRING,
POSNR TYPE STRING,
BDATJ TYPE STRING,
POPER TYPE STRING,
BUDAT TYPE STRING,
PERART TYPE STRING,
LBKUM TYPE STRING,
LBKUM_OLD TYPE STRING,
UNTPER TYPE STRING,
BKLAS TYPE STRING,
XKONCHK TYPE STRING,
STATUS TYPE STRING,
MODIF TYPE STRING,
XVNB TYPE STRING,
XWIP TYPE STRING,
XOBJWIP TYPE STRING,
XNOPL TYPE STRING,
XMSTUF TYPE STRING,
XCKMM TYPE STRING,
XCLEAN TYPE STRING,
XAVRSIM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MLPP_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_MLPP_STR-MANDT sy-vline 
WA_MLPP_STR-BELNR sy-vline 
WA_MLPP_STR-KJAHR sy-vline 
WA_MLPP_STR-POSNR sy-vline 
WA_MLPP_STR-BDATJ sy-vline 
WA_MLPP_STR-POPER sy-vline 
WA_MLPP_STR-BUDAT sy-vline 
WA_MLPP_STR-PERART sy-vline 
WA_MLPP_STR-LBKUM sy-vline 
WA_MLPP_STR-LBKUM_OLD sy-vline 
WA_MLPP_STR-UNTPER sy-vline 
WA_MLPP_STR-BKLAS sy-vline 
WA_MLPP_STR-XKONCHK sy-vline 
WA_MLPP_STR-STATUS sy-vline 
WA_MLPP_STR-MODIF sy-vline 
WA_MLPP_STR-XVNB sy-vline 
WA_MLPP_STR-XWIP sy-vline 
WA_MLPP_STR-XOBJWIP sy-vline 
WA_MLPP_STR-XNOPL sy-vline 
WA_MLPP_STR-XMSTUF sy-vline 
WA_MLPP_STR-XCKMM sy-vline 
WA_MLPP_STR-XCLEAN sy-vline 
WA_MLPP_STR-XAVRSIM sy-vline      INTO ld_text SEPARATED BY SPACE.

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