ABAP Select data from SAP table MLST_UPD_VS2OP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MLST_UPD_VS2OP 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 MLST_UPD_VS2OP. 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 MLST_UPD_VS2OP 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_MLST_UPD_VS2OP TYPE STANDARD TABLE OF MLST_UPD_VS2OP,
      WA_MLST_UPD_VS2OP TYPE MLST_UPD_VS2OP,
      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: <MLST_UPD_VS2OP> TYPE MLST_UPD_VS2OP.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MLST_UPD_VS2OP.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MLST_UPD_VS2OP
  INTO TABLE IT_MLST_UPD_VS2OP.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MLST_UPD_VS2OP
*  INTO TABLE @DATA(IT_MLST_UPD_VS2OP2).
*--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_MLST_UPD_VS2OP INDEX 1 INTO DATA(WA_MLST_UPD_VS2OP2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MLST_UPD_VS2OP ASSIGNING <MLST_UPD_VS2OP>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MLST_UPD_VS2OP>-MLST_MANDT = 1.
<MLST_UPD_VS2OP>-MLST_ZAEHL = 1.
<MLST_UPD_VS2OP>-ZAEHL = 1.
<MLST_UPD_VS2OP>-AUFPL = 1.
<MLST_UPD_VS2OP>-APLZL = 1.

ENDLOOP.

LOOP AT IT_MLST_UPD_VS2OP INTO WA_MLST_UPD_VS2OP.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MLST_UPD_VS2OP-PSPNR, sy-vline,
  WA_MLST_UPD_VS2OP-RUECK, sy-vline,
  WA_MLST_UPD_VS2OP-RMZHL, sy-vline,
  WA_MLST_UPD_VS2OP-MLTX_MANDT, sy-vline,
  WA_MLST_UPD_VS2OP-MLTX_ZAEHL, sy-vline,
  WA_MLST_UPD_VS2OP-LANGU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MLST_UPD_VS2OP 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_MLST_UPD_VS2OP 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_MLST_UPD_VS2OP INTO WA_MLST_UPD_VS2OP.


*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 ABPSP, internal->external for field PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_MLST_UPD_VS2OP-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLST_UPD_VS2OP-PSPNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MLST_UPD_VS2OP-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLST_UPD_VS2OP-LANGU.
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_MLST_UPD_VS2OP_STR, 
MLST_MANDT TYPE STRING,
MLST_ZAEHL TYPE STRING,
ZAEHL TYPE STRING,
AUFPL TYPE STRING,
APLZL TYPE STRING,
PSPNR TYPE STRING,
RUECK TYPE STRING,
RMZHL TYPE STRING,
MLTX_MANDT TYPE STRING,
MLTX_ZAEHL TYPE STRING,
LANGU TYPE STRING,
MLST_ZAEHL_ORG TYPE STRING,
ZAEHL_EXT_ORG TYPE STRING,
MLST_ZAEHL_EXT TYPE STRING,
LST_FERTG TYPE STRING,
LST_ACTDT TYPE STRING,
LST_ACTTM TYPE STRING,
RELSU_AL TYPE STRING,
RELMS_AL TYPE STRING,
INCPN_AL TYPE STRING,
INCNW_AL TYPE STRING,
INCSN_AL TYPE STRING,
WKFLW_AL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MLST_UPD_VS2OP_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_MLST_UPD_VS2OP_STR-MLST_MANDT sy-vline 
WA_MLST_UPD_VS2OP_STR-MLST_ZAEHL sy-vline 
WA_MLST_UPD_VS2OP_STR-ZAEHL sy-vline 
WA_MLST_UPD_VS2OP_STR-AUFPL sy-vline 
WA_MLST_UPD_VS2OP_STR-APLZL sy-vline 
WA_MLST_UPD_VS2OP_STR-PSPNR sy-vline 
WA_MLST_UPD_VS2OP_STR-RUECK sy-vline 
WA_MLST_UPD_VS2OP_STR-RMZHL sy-vline 
WA_MLST_UPD_VS2OP_STR-MLTX_MANDT sy-vline 
WA_MLST_UPD_VS2OP_STR-MLTX_ZAEHL sy-vline 
WA_MLST_UPD_VS2OP_STR-LANGU sy-vline 
WA_MLST_UPD_VS2OP_STR-MLST_ZAEHL_ORG sy-vline 
WA_MLST_UPD_VS2OP_STR-ZAEHL_EXT_ORG sy-vline 
WA_MLST_UPD_VS2OP_STR-MLST_ZAEHL_EXT sy-vline 
WA_MLST_UPD_VS2OP_STR-LST_FERTG sy-vline 
WA_MLST_UPD_VS2OP_STR-LST_ACTDT sy-vline 
WA_MLST_UPD_VS2OP_STR-LST_ACTTM sy-vline 
WA_MLST_UPD_VS2OP_STR-RELSU_AL sy-vline 
WA_MLST_UPD_VS2OP_STR-RELMS_AL sy-vline 
WA_MLST_UPD_VS2OP_STR-INCPN_AL sy-vline 
WA_MLST_UPD_VS2OP_STR-INCNW_AL sy-vline 
WA_MLST_UPD_VS2OP_STR-INCSN_AL sy-vline 
WA_MLST_UPD_VS2OP_STR-WKFLW_AL sy-vline      INTO ld_text SEPARATED BY SPACE.

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