ABAP Select data from SAP table MLWR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MLWR
*  INTO TABLE @DATA(IT_MLWR2).
*--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_MLWR INDEX 1 INTO DATA(WA_MLWR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MLWR>-MANDT = 1.
<MLWR>-AWTYP = 1.
<MLWR>-AWREF = 1.
<MLWR>-AWORG = 1.
<MLWR>-POSNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MLWR-BDATJ, sy-vline,
  WA_MLWR-POPER, sy-vline,
  WA_MLWR-CURTP, sy-vline,
  WA_MLWR-CO_BELNR, sy-vline,
  WA_MLWR-KJAHR, sy-vline,
  WA_MLWR-URZEILE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MLWR 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_MLWR 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_MLWR INTO WA_MLWR.


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

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

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

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

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

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

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

*Conversion exit ABPSP, internal->external for field MAT_PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_MLWR-MAT_PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLWR-MAT_PSPNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MLWR-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLWR-MEINS.
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_MLWR_STR, 
MANDT TYPE STRING,
AWTYP TYPE STRING,
AWREF TYPE STRING,
AWORG TYPE STRING,
POSNR TYPE STRING,
BDATJ TYPE STRING,
POPER TYPE STRING,
CURTP TYPE STRING,
CO_BELNR TYPE STRING,
KJAHR TYPE STRING,
URZEILE TYPE STRING,
AWSYS TYPE STRING,
KALNR TYPE STRING,
MLAST TYPE STRING,
BUKRS TYPE STRING,
BWKEY TYPE STRING,
MATNR TYPE STRING,
BWTAR TYPE STRING,
KZBWS TYPE STRING,
SOBKZ TYPE STRING,
MAT_KDAUF TYPE STRING,
MAT_KDPOS TYPE STRING,
MAT_PSPNR TYPE STRING,
MAT_LIFNR TYPE STRING,
MLPTYP TYPE STRING,
QSBVALT TYPE STRING,
QSPROCESS TYPE STRING,
GLVOR TYPE STRING,
BUDAT TYPE STRING,
DATUM TYPE STRING,
UZEIT TYPE STRING,
USNAM TYPE STRING,
MEINS TYPE STRING,
XREVERSED TYPE STRING,
LBKUM_OLD TYPE STRING,
LBKUM TYPE STRING,
WAERS TYPE STRING,
SALK3_OLD TYPE STRING,
SALK3 TYPE STRING,
SALKV_OLD TYPE STRING,
SALKV TYPE STRING,
PEINH TYPE STRING,
PVPRS_OLD TYPE STRING,
STPRS_OLD TYPE STRING,
VPRSV_OLD TYPE STRING,
VKSAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MLWR_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_MLWR_STR-MANDT sy-vline 
WA_MLWR_STR-AWTYP sy-vline 
WA_MLWR_STR-AWREF sy-vline 
WA_MLWR_STR-AWORG sy-vline 
WA_MLWR_STR-POSNR sy-vline 
WA_MLWR_STR-BDATJ sy-vline 
WA_MLWR_STR-POPER sy-vline 
WA_MLWR_STR-CURTP sy-vline 
WA_MLWR_STR-CO_BELNR sy-vline 
WA_MLWR_STR-KJAHR sy-vline 
WA_MLWR_STR-URZEILE sy-vline 
WA_MLWR_STR-AWSYS sy-vline 
WA_MLWR_STR-KALNR sy-vline 
WA_MLWR_STR-MLAST sy-vline 
WA_MLWR_STR-BUKRS sy-vline 
WA_MLWR_STR-BWKEY sy-vline 
WA_MLWR_STR-MATNR sy-vline 
WA_MLWR_STR-BWTAR sy-vline 
WA_MLWR_STR-KZBWS sy-vline 
WA_MLWR_STR-SOBKZ sy-vline 
WA_MLWR_STR-MAT_KDAUF sy-vline 
WA_MLWR_STR-MAT_KDPOS sy-vline 
WA_MLWR_STR-MAT_PSPNR sy-vline 
WA_MLWR_STR-MAT_LIFNR sy-vline 
WA_MLWR_STR-MLPTYP sy-vline 
WA_MLWR_STR-QSBVALT sy-vline 
WA_MLWR_STR-QSPROCESS sy-vline 
WA_MLWR_STR-GLVOR sy-vline 
WA_MLWR_STR-BUDAT sy-vline 
WA_MLWR_STR-DATUM sy-vline 
WA_MLWR_STR-UZEIT sy-vline 
WA_MLWR_STR-USNAM sy-vline 
WA_MLWR_STR-MEINS sy-vline 
WA_MLWR_STR-XREVERSED sy-vline 
WA_MLWR_STR-LBKUM_OLD sy-vline 
WA_MLWR_STR-LBKUM sy-vline 
WA_MLWR_STR-WAERS sy-vline 
WA_MLWR_STR-SALK3_OLD sy-vline 
WA_MLWR_STR-SALK3 sy-vline 
WA_MLWR_STR-SALKV_OLD sy-vline 
WA_MLWR_STR-SALKV sy-vline 
WA_MLWR_STR-PEINH sy-vline 
WA_MLWR_STR-PVPRS_OLD sy-vline 
WA_MLWR_STR-STPRS_OLD sy-vline 
WA_MLWR_STR-VPRSV_OLD sy-vline 
WA_MLWR_STR-VKSAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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