ABAP Select data from SAP table TWISPC_MDATTR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TWISPC_MDATTR
*  INTO TABLE @DATA(IT_TWISPC_MDATTR2).
*--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_TWISPC_MDATTR INDEX 1 INTO DATA(WA_TWISPC_MDATTR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TWISPC_MDATTR>-MANDT = 1.
<TWISPC_MDATTR>-PLSZN = 1.
<TWISPC_MDATTR>-PLSCH = 1.
<TWISPC_MDATTR>-PLMER = 1.
<TWISPC_MDATTR>-PLATT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TWISPC_MDATTR-ROLLNAME, sy-vline,
  WA_TWISPC_MDATTR-DOMNAME, sy-vline,
  WA_TWISPC_MDATTR-FLDTXT, sy-vline,
  WA_TWISPC_MDATTR-INPUTFLG, sy-vline,
  WA_TWISPC_MDATTR-TABNAME, sy-vline,
  WA_TWISPC_MDATTR-F4PR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TWISPC_MDATTR 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_TWISPC_MDATTR 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_TWISPC_MDATTR INTO WA_TWISPC_MDATTR.


*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_TWISPC_MDATTR_STR, 
MANDT TYPE STRING,
PLSZN TYPE STRING,
PLSCH TYPE STRING,
PLMER TYPE STRING,
PLATT TYPE STRING,
ROLLNAME TYPE STRING,
DOMNAME TYPE STRING,
FLDTXT TYPE STRING,
INPUTFLG TYPE STRING,
TABNAME TYPE STRING,
F4PR TYPE STRING,
F4FM TYPE STRING,
ATRCF TYPE STRING,
LFDNR TYPE STRING,
DBTAB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TWISPC_MDATTR_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_TWISPC_MDATTR_STR-MANDT sy-vline 
WA_TWISPC_MDATTR_STR-PLSZN sy-vline 
WA_TWISPC_MDATTR_STR-PLSCH sy-vline 
WA_TWISPC_MDATTR_STR-PLMER sy-vline 
WA_TWISPC_MDATTR_STR-PLATT sy-vline 
WA_TWISPC_MDATTR_STR-ROLLNAME sy-vline 
WA_TWISPC_MDATTR_STR-DOMNAME sy-vline 
WA_TWISPC_MDATTR_STR-FLDTXT sy-vline 
WA_TWISPC_MDATTR_STR-INPUTFLG sy-vline 
WA_TWISPC_MDATTR_STR-TABNAME sy-vline 
WA_TWISPC_MDATTR_STR-F4PR sy-vline 
WA_TWISPC_MDATTR_STR-F4FM sy-vline 
WA_TWISPC_MDATTR_STR-ATRCF sy-vline 
WA_TWISPC_MDATTR_STR-LFDNR sy-vline 
WA_TWISPC_MDATTR_STR-DBTAB sy-vline      INTO ld_text SEPARATED BY SPACE.

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