ABAP Select data from SAP table HSMS_MDBUF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM HSMS_MDBUF
*  INTO TABLE @DATA(IT_HSMS_MDBUF2).
*--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_HSMS_MDBUF INDEX 1 INTO DATA(WA_HSMS_MDBUF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<HSMS_MDBUF>-VALFLG = 1.
<HSMS_MDBUF>-CHCOFLG = 1.
<HSMS_MDBUF>-LOCKMOD = 1.
<HSMS_MDBUF>-LOGLOCKMOD = 1.
<HSMS_MDBUF>-SAVEMOD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_HSMS_MDBUF-SPLIT, sy-vline,
  WA_HSMS_MDBUF-BUF_ORIG_INDEX, sy-vline,
  WA_HSMS_MDBUF-CHANGENO, sy-vline,
  WA_HSMS_MDBUF-KEYDATE, sy-vline,
  WA_HSMS_MDBUF-MANDT, sy-vline,
  WA_HSMS_MDBUF-RECN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_HSMS_MDBUF 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_HSMS_MDBUF 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_HSMS_MDBUF INTO WA_HSMS_MDBUF.


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

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

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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_HSMS_MDBUF-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HSMS_MDBUF-MATNR.
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_HSMS_MDBUF_STR, 
VALFLG TYPE STRING,
CHCOFLG TYPE STRING,
LOCKMOD TYPE STRING,
LOGLOCKMOD TYPE STRING,
SAVEMOD TYPE STRING,
SPLIT TYPE STRING,
BUF_ORIG_INDEX TYPE STRING,
CHANGENO TYPE STRING,
KEYDATE TYPE STRING,
MANDT TYPE STRING,
RECN TYPE STRING,
ACTN TYPE STRING,
VALFR TYPE STRING,
VALTO TYPE STRING,
AENNR TYPE STRING,
DELFLG TYPE STRING,
PARKFLG TYPE STRING,
CRDAT TYPE STRING,
CRNAM TYPE STRING,
UPDDAT TYPE STRING,
UPDNAM TYPE STRING,
SRSID TYPE STRING,
OWNID TYPE STRING,
RECNROOT TYPE STRING,
MATNR TYPE STRING,
COUNTRY TYPE STRING,
REGION TYPE STRING,
STOKEY1 TYPE STRING,
STOKEY2 TYPE STRING,
WPC TYPE STRING,
STWA TYPE STRING,
STMA TYPE STRING,
VBF TYPE STRING,
NAME TYPE STRING,
DESCR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_HSMS_MDBUF_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_HSMS_MDBUF_STR-VALFLG sy-vline 
WA_HSMS_MDBUF_STR-CHCOFLG sy-vline 
WA_HSMS_MDBUF_STR-LOCKMOD sy-vline 
WA_HSMS_MDBUF_STR-LOGLOCKMOD sy-vline 
WA_HSMS_MDBUF_STR-SAVEMOD sy-vline 
WA_HSMS_MDBUF_STR-SPLIT sy-vline 
WA_HSMS_MDBUF_STR-BUF_ORIG_INDEX sy-vline 
WA_HSMS_MDBUF_STR-CHANGENO sy-vline 
WA_HSMS_MDBUF_STR-KEYDATE sy-vline 
WA_HSMS_MDBUF_STR-MANDT sy-vline 
WA_HSMS_MDBUF_STR-RECN sy-vline 
WA_HSMS_MDBUF_STR-ACTN sy-vline 
WA_HSMS_MDBUF_STR-VALFR sy-vline 
WA_HSMS_MDBUF_STR-VALTO sy-vline 
WA_HSMS_MDBUF_STR-AENNR sy-vline 
WA_HSMS_MDBUF_STR-DELFLG sy-vline 
WA_HSMS_MDBUF_STR-PARKFLG sy-vline 
WA_HSMS_MDBUF_STR-CRDAT sy-vline 
WA_HSMS_MDBUF_STR-CRNAM sy-vline 
WA_HSMS_MDBUF_STR-UPDDAT sy-vline 
WA_HSMS_MDBUF_STR-UPDNAM sy-vline 
WA_HSMS_MDBUF_STR-SRSID sy-vline 
WA_HSMS_MDBUF_STR-OWNID sy-vline 
WA_HSMS_MDBUF_STR-RECNROOT sy-vline 
WA_HSMS_MDBUF_STR-MATNR sy-vline 
WA_HSMS_MDBUF_STR-COUNTRY sy-vline 
WA_HSMS_MDBUF_STR-REGION sy-vline 
WA_HSMS_MDBUF_STR-STOKEY1 sy-vline 
WA_HSMS_MDBUF_STR-STOKEY2 sy-vline 
WA_HSMS_MDBUF_STR-WPC sy-vline 
WA_HSMS_MDBUF_STR-STWA sy-vline 
WA_HSMS_MDBUF_STR-STMA sy-vline 
WA_HSMS_MDBUF_STR-VBF sy-vline 
WA_HSMS_MDBUF_STR-NAME sy-vline 
WA_HSMS_MDBUF_STR-DESCR sy-vline      INTO ld_text SEPARATED BY SPACE.

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