ABAP Select data from SAP table BIW_MLS_V into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BIW_MLS_V 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_MLS_V. 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_MLS_V 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_MLS_V TYPE STANDARD TABLE OF BIW_MLS_V,
      WA_BIW_MLS_V TYPE BIW_MLS_V,
      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_MLS_V> TYPE BIW_MLS_V.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BIW_MLS_V
*  INTO TABLE @DATA(IT_BIW_MLS_V2).
*--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_MLS_V INDEX 1 INTO DATA(WA_BIW_MLS_V2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BIW_MLS_V>-MANDT = 1.
<BIW_MLS_V>-AUFNR = 1.
<BIW_MLS_V>-VORNR = 1.
<BIW_MLS_V>-AUFPL = 1.
<BIW_MLS_V>-APLZL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BIW_MLS_V-MLST_ZAEHL, sy-vline,
  WA_BIW_MLS_V-ZAEHL, sy-vline,
  WA_BIW_MLS_V-PSPID_NP_I, sy-vline,
  WA_BIW_MLS_V-POSID_NP_I, sy-vline,
  WA_BIW_MLS_V-POSID_NV_I, sy-vline,
  WA_BIW_MLS_V-KOKRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BIW_MLS_V 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_MLS_V 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_MLS_V INTO WA_BIW_MLS_V.


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

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

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

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

*Conversion exit ABPSP, internal->external for field POSID_NV_I
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_BIW_MLS_V-POSID_NV_I
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_MLS_V-POSID_NV_I.
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_MLS_V_STR, 
MANDT TYPE STRING,
AUFNR TYPE STRING,
VORNR TYPE STRING,
AUFPL TYPE STRING,
APLZL TYPE STRING,
MLST_ZAEHL TYPE STRING,
ZAEHL TYPE STRING,
PSPID_NP_I TYPE STRING,
POSID_NP_I TYPE STRING,
POSID_NV_I TYPE STRING,
KOKRS TYPE STRING,
AUTYP TYPE STRING,
MLSTN TYPE STRING,
DATEV 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,
KZ_TREND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BIW_MLS_V_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_MLS_V_STR-MANDT sy-vline 
WA_BIW_MLS_V_STR-AUFNR sy-vline 
WA_BIW_MLS_V_STR-VORNR sy-vline 
WA_BIW_MLS_V_STR-AUFPL sy-vline 
WA_BIW_MLS_V_STR-APLZL sy-vline 
WA_BIW_MLS_V_STR-MLST_ZAEHL sy-vline 
WA_BIW_MLS_V_STR-ZAEHL sy-vline 
WA_BIW_MLS_V_STR-PSPID_NP_I sy-vline 
WA_BIW_MLS_V_STR-POSID_NP_I sy-vline 
WA_BIW_MLS_V_STR-POSID_NV_I sy-vline 
WA_BIW_MLS_V_STR-KOKRS sy-vline 
WA_BIW_MLS_V_STR-AUTYP sy-vline 
WA_BIW_MLS_V_STR-MLSTN sy-vline 
WA_BIW_MLS_V_STR-DATEV sy-vline 
WA_BIW_MLS_V_STR-DATEH sy-vline 
WA_BIW_MLS_V_STR-TEDAT sy-vline 
WA_BIW_MLS_V_STR-TETIM sy-vline 
WA_BIW_MLS_V_STR-TPDAT sy-vline 
WA_BIW_MLS_V_STR-TPTIM sy-vline 
WA_BIW_MLS_V_STR-EDATU sy-vline 
WA_BIW_MLS_V_STR-EZEIT sy-vline 
WA_BIW_MLS_V_STR-PDATU sy-vline 
WA_BIW_MLS_V_STR-PZEIT sy-vline 
WA_BIW_MLS_V_STR-LST_ACTDT sy-vline 
WA_BIW_MLS_V_STR-LST_ACTTM sy-vline 
WA_BIW_MLS_V_STR-KZ_TREND sy-vline      INTO ld_text SEPARATED BY SPACE.

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