ABAP Select data from SAP table MLSTD_UPDATE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MLSTD_UPDATE
*  INTO TABLE @DATA(IT_MLSTD_UPDATE2).
*--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_MLSTD_UPDATE INDEX 1 INTO DATA(WA_MLSTD_UPDATE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MLSTD_UPDATE>-MLST_ZAEHL = 1.
<MLSTD_UPDATE>-PSPNR = 1.
<MLSTD_UPDATE>-MLSTN = 1.
<MLSTD_UPDATE>-KTEXT = 1.
<MLSTD_UPDATE>-TEDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MLSTD_UPDATE-TETIM, sy-vline,
  WA_MLSTD_UPDATE-TPDAT, sy-vline,
  WA_MLSTD_UPDATE-TPTIM, sy-vline,
  WA_MLSTD_UPDATE-EDATU, sy-vline,
  WA_MLSTD_UPDATE-EZEIT, sy-vline,
  WA_MLSTD_UPDATE-PDATU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MLSTD_UPDATE 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_MLSTD_UPDATE 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_MLSTD_UPDATE INTO WA_MLSTD_UPDATE.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MLSTD_UPDATE_STR, 
MLST_ZAEHL TYPE STRING,
PSPNR TYPE STRING,
MLSTN TYPE STRING,
KTEXT 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,
LATED TYPE STRING,
DLTAS TYPE STRING,
DELTA TYPE STRING,
DELTE TYPE STRING,
PRCNT TYPE STRING,
KZ_TREND TYPE STRING,
KZ_LSTWR TYPE STRING,
LST_FERTG TYPE STRING,
KZ_FAKTP TYPE STRING,
FPROZ TYPE STRING,
NPLNR TYPE STRING,
NW_VORNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MLSTD_UPDATE_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_MLSTD_UPDATE_STR-MLST_ZAEHL sy-vline 
WA_MLSTD_UPDATE_STR-PSPNR sy-vline 
WA_MLSTD_UPDATE_STR-MLSTN sy-vline 
WA_MLSTD_UPDATE_STR-KTEXT sy-vline 
WA_MLSTD_UPDATE_STR-TEDAT sy-vline 
WA_MLSTD_UPDATE_STR-TETIM sy-vline 
WA_MLSTD_UPDATE_STR-TPDAT sy-vline 
WA_MLSTD_UPDATE_STR-TPTIM sy-vline 
WA_MLSTD_UPDATE_STR-EDATU sy-vline 
WA_MLSTD_UPDATE_STR-EZEIT sy-vline 
WA_MLSTD_UPDATE_STR-PDATU sy-vline 
WA_MLSTD_UPDATE_STR-PZEIT sy-vline 
WA_MLSTD_UPDATE_STR-LST_ACTDT sy-vline 
WA_MLSTD_UPDATE_STR-LST_ACTTM sy-vline 
WA_MLSTD_UPDATE_STR-LATED sy-vline 
WA_MLSTD_UPDATE_STR-DLTAS sy-vline 
WA_MLSTD_UPDATE_STR-DELTA sy-vline 
WA_MLSTD_UPDATE_STR-DELTE sy-vline 
WA_MLSTD_UPDATE_STR-PRCNT sy-vline 
WA_MLSTD_UPDATE_STR-KZ_TREND sy-vline 
WA_MLSTD_UPDATE_STR-KZ_LSTWR sy-vline 
WA_MLSTD_UPDATE_STR-LST_FERTG sy-vline 
WA_MLSTD_UPDATE_STR-KZ_FAKTP sy-vline 
WA_MLSTD_UPDATE_STR-FPROZ sy-vline 
WA_MLSTD_UPDATE_STR-NPLNR sy-vline 
WA_MLSTD_UPDATE_STR-NW_VORNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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