ABAP Select data from SAP table BIW_MLSTDT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BIW_MLSTDT
*  INTO TABLE @DATA(IT_BIW_MLSTDT2).
*--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_BIW_MLSTDT INDEX 1 INTO DATA(WA_BIW_MLSTDT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BIW_MLSTDT>-MANDT = 1.
<BIW_MLSTDT>-MLST_ZAEHL = 1.
<BIW_MLSTDT>-ZAEHL = 1.
<BIW_MLSTDT>-AUFPL = 1.
<BIW_MLSTDT>-APLZL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BIW_MLSTDT-VORNR, sy-vline,
  WA_BIW_MLSTDT-AUFNR, sy-vline,
  WA_BIW_MLSTDT-POSID, sy-vline,
  WA_BIW_MLSTDT-PSPNR, sy-vline,
  WA_BIW_MLSTDT-DATEV, sy-vline,
  WA_BIW_MLSTDT-AUTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BIW_MLSTDT 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_BIW_MLSTDT 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_BIW_MLSTDT INTO WA_BIW_MLSTDT.


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

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

*Conversion exit ABPSN, internal->external for field POSID
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_BIW_MLSTDT-POSID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_MLSTDT-POSID.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ABPSN, internal->external for field PSPID
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_BIW_MLSTDT-PSPID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_MLSTDT-PSPID.
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_BIW_MLSTDT_STR, 
MANDT TYPE STRING,
MLST_ZAEHL TYPE STRING,
ZAEHL TYPE STRING,
AUFPL TYPE STRING,
APLZL TYPE STRING,
VORNR TYPE STRING,
AUFNR TYPE STRING,
POSID TYPE STRING,
PSPNR TYPE STRING,
DATEV TYPE STRING,
AUTYP TYPE STRING,
DATEH TYPE STRING,
PSPID TYPE STRING,
TEDAT TYPE STRING,
TETIM TYPE STRING,
TPDAT TYPE STRING,
TPTIM TYPE STRING,
EDATU TYPE STRING,
EZEIT TYPE STRING,
PDATU TYPE STRING,
PZEIT TYPE STRING,
LST_ACTDT TYPE STRING,
LST_ACTTM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BIW_MLSTDT_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_BIW_MLSTDT_STR-MANDT sy-vline 
WA_BIW_MLSTDT_STR-MLST_ZAEHL sy-vline 
WA_BIW_MLSTDT_STR-ZAEHL sy-vline 
WA_BIW_MLSTDT_STR-AUFPL sy-vline 
WA_BIW_MLSTDT_STR-APLZL sy-vline 
WA_BIW_MLSTDT_STR-VORNR sy-vline 
WA_BIW_MLSTDT_STR-AUFNR sy-vline 
WA_BIW_MLSTDT_STR-POSID sy-vline 
WA_BIW_MLSTDT_STR-PSPNR sy-vline 
WA_BIW_MLSTDT_STR-DATEV sy-vline 
WA_BIW_MLSTDT_STR-AUTYP sy-vline 
WA_BIW_MLSTDT_STR-DATEH sy-vline 
WA_BIW_MLSTDT_STR-PSPID sy-vline 
WA_BIW_MLSTDT_STR-TEDAT sy-vline 
WA_BIW_MLSTDT_STR-TETIM sy-vline 
WA_BIW_MLSTDT_STR-TPDAT sy-vline 
WA_BIW_MLSTDT_STR-TPTIM sy-vline 
WA_BIW_MLSTDT_STR-EDATU sy-vline 
WA_BIW_MLSTDT_STR-EZEIT sy-vline 
WA_BIW_MLSTDT_STR-PDATU sy-vline 
WA_BIW_MLSTDT_STR-PZEIT sy-vline 
WA_BIW_MLSTDT_STR-LST_ACTDT sy-vline 
WA_BIW_MLSTDT_STR-LST_ACTTM sy-vline      INTO ld_text SEPARATED BY SPACE.

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