ABAP Select data from SAP table HSMS_MDAPI into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP HSMS_MDAPI 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_MDAPI. 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_MDAPI 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_MDAPI TYPE STANDARD TABLE OF HSMS_MDAPI,
      WA_HSMS_MDAPI TYPE HSMS_MDAPI,
      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_MDAPI> TYPE HSMS_MDAPI.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM HSMS_MDAPI
*  INTO TABLE @DATA(IT_HSMS_MDAPI2).
*--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_MDAPI INDEX 1 INTO DATA(WA_HSMS_MDAPI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<HSMS_MDAPI>-ERRORMODE = 1.
<HSMS_MDAPI>-ERRORINFO = 1.
<HSMS_MDAPI>-ERRORCLASS = 1.
<HSMS_MDAPI>-ERRORPARAM = 1.
<HSMS_MDAPI>-LOGLOCKMOD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_HSMS_MDAPI-EXTINFO, sy-vline,
  WA_HSMS_MDAPI-LINEMOD, sy-vline,
  WA_HSMS_MDAPI-MANDT, sy-vline,
  WA_HSMS_MDAPI-RECN, sy-vline,
  WA_HSMS_MDAPI-ACTN, sy-vline,
  WA_HSMS_MDAPI-VALFR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_HSMS_MDAPI 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_MDAPI 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_MDAPI INTO WA_HSMS_MDAPI.


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

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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_HSMS_MDAPI-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HSMS_MDAPI-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_MDAPI_STR, 
ERRORMODE TYPE STRING,
ERRORINFO TYPE STRING,
ERRORCLASS TYPE STRING,
ERRORPARAM TYPE STRING,
LOGLOCKMOD TYPE STRING,
EXTINFO TYPE STRING,
LINEMOD 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_MDAPI_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_MDAPI_STR-ERRORMODE sy-vline 
WA_HSMS_MDAPI_STR-ERRORINFO sy-vline 
WA_HSMS_MDAPI_STR-ERRORCLASS sy-vline 
WA_HSMS_MDAPI_STR-ERRORPARAM sy-vline 
WA_HSMS_MDAPI_STR-LOGLOCKMOD sy-vline 
WA_HSMS_MDAPI_STR-EXTINFO sy-vline 
WA_HSMS_MDAPI_STR-LINEMOD sy-vline 
WA_HSMS_MDAPI_STR-MANDT sy-vline 
WA_HSMS_MDAPI_STR-RECN sy-vline 
WA_HSMS_MDAPI_STR-ACTN sy-vline 
WA_HSMS_MDAPI_STR-VALFR sy-vline 
WA_HSMS_MDAPI_STR-VALTO sy-vline 
WA_HSMS_MDAPI_STR-AENNR sy-vline 
WA_HSMS_MDAPI_STR-DELFLG sy-vline 
WA_HSMS_MDAPI_STR-PARKFLG sy-vline 
WA_HSMS_MDAPI_STR-CRDAT sy-vline 
WA_HSMS_MDAPI_STR-CRNAM sy-vline 
WA_HSMS_MDAPI_STR-UPDDAT sy-vline 
WA_HSMS_MDAPI_STR-UPDNAM sy-vline 
WA_HSMS_MDAPI_STR-SRSID sy-vline 
WA_HSMS_MDAPI_STR-OWNID sy-vline 
WA_HSMS_MDAPI_STR-RECNROOT sy-vline 
WA_HSMS_MDAPI_STR-MATNR sy-vline 
WA_HSMS_MDAPI_STR-COUNTRY sy-vline 
WA_HSMS_MDAPI_STR-REGION sy-vline 
WA_HSMS_MDAPI_STR-STOKEY1 sy-vline 
WA_HSMS_MDAPI_STR-STOKEY2 sy-vline 
WA_HSMS_MDAPI_STR-WPC sy-vline 
WA_HSMS_MDAPI_STR-STWA sy-vline 
WA_HSMS_MDAPI_STR-STMA sy-vline 
WA_HSMS_MDAPI_STR-VBF sy-vline 
WA_HSMS_MDAPI_STR-NAME sy-vline 
WA_HSMS_MDAPI_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.