ABAP Select data from SAP table BIW_MLSTVP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BIW_MLSTVP 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_MLSTVP. 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_MLSTVP 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_MLSTVP TYPE STANDARD TABLE OF BIW_MLSTVP,
      WA_BIW_MLSTVP TYPE BIW_MLSTVP,
      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_MLSTVP> TYPE BIW_MLSTVP.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BIW_MLSTVP
*  INTO TABLE @DATA(IT_BIW_MLSTVP2).
*--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_MLSTVP INDEX 1 INTO DATA(WA_BIW_MLSTVP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BIW_MLSTVP>-MANDT = 1.
<BIW_MLSTVP>-MLST_ZAEHL = 1.
<BIW_MLSTVP>-ZAEHL = 1.
<BIW_MLSTVP>-MLSTN = 1.
<BIW_MLSTVP>-DATEV = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BIW_MLSTVP-PSPID_INT, sy-vline,
  WA_BIW_MLSTVP-PSPID, sy-vline,
  WA_BIW_MLSTVP-POSID_INT, sy-vline,
  WA_BIW_MLSTVP-POSID, sy-vline,
  WA_BIW_MLSTVP-PSPNR, sy-vline,
  WA_BIW_MLSTVP-AUTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BIW_MLSTVP 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_MLSTVP 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_MLSTVP INTO WA_BIW_MLSTVP.


*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 KONPD, internal->external for field PSPID_INT
CALL FUNCTION 'CONVERSION_EXIT_KONPD_OUTPUT'
  EXPORTING
    input =                      WA_BIW_MLSTVP-PSPID_INT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_MLSTVP-PSPID_INT.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit KONPD, internal->external for field PSPNR
CALL FUNCTION 'CONVERSION_EXIT_KONPD_OUTPUT'
  EXPORTING
    input =                      WA_BIW_MLSTVP-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_MLSTVP-PSPNR.
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_MLSTVP_STR, 
MANDT TYPE STRING,
MLST_ZAEHL TYPE STRING,
ZAEHL TYPE STRING,
MLSTN TYPE STRING,
DATEV TYPE STRING,
PSPID_INT TYPE STRING,
PSPID TYPE STRING,
POSID_INT TYPE STRING,
POSID TYPE STRING,
PSPNR TYPE STRING,
AUTYP TYPE STRING,
DATEH 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_MLSTVP_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_MLSTVP_STR-MANDT sy-vline 
WA_BIW_MLSTVP_STR-MLST_ZAEHL sy-vline 
WA_BIW_MLSTVP_STR-ZAEHL sy-vline 
WA_BIW_MLSTVP_STR-MLSTN sy-vline 
WA_BIW_MLSTVP_STR-DATEV sy-vline 
WA_BIW_MLSTVP_STR-PSPID_INT sy-vline 
WA_BIW_MLSTVP_STR-PSPID sy-vline 
WA_BIW_MLSTVP_STR-POSID_INT sy-vline 
WA_BIW_MLSTVP_STR-POSID sy-vline 
WA_BIW_MLSTVP_STR-PSPNR sy-vline 
WA_BIW_MLSTVP_STR-AUTYP sy-vline 
WA_BIW_MLSTVP_STR-DATEH sy-vline 
WA_BIW_MLSTVP_STR-TEDAT sy-vline 
WA_BIW_MLSTVP_STR-TETIM sy-vline 
WA_BIW_MLSTVP_STR-TPDAT sy-vline 
WA_BIW_MLSTVP_STR-TPTIM sy-vline 
WA_BIW_MLSTVP_STR-EDATU sy-vline 
WA_BIW_MLSTVP_STR-EZEIT sy-vline 
WA_BIW_MLSTVP_STR-PDATU sy-vline 
WA_BIW_MLSTVP_STR-PZEIT sy-vline 
WA_BIW_MLSTVP_STR-LST_ACTDT sy-vline 
WA_BIW_MLSTVP_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.