ABAP Select data from SAP table SDMECLSATR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SDMECLSATR
*  INTO TABLE @DATA(IT_SDMECLSATR2).
*--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_SDMECLSATR INDEX 1 INTO DATA(WA_SDMECLSATR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SDMECLSATR>-CLSNAME = 1.
<SDMECLSATR>-VERSION = 1.
<SDMECLSATR>-ATTRNAME = 1.
<SDMECLSATR>-EDITORDER = 1.
<SDMECLSATR>-KEYFLG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SDMECLSATR-PERSFLAG, sy-vline,
  WA_SDMECLSATR-TABFIELD, sy-vline,
  WA_SDMECLSATR-REFTYPE, sy-vline,
  WA_SDMECLSATR-REFCLASS, sy-vline,
  WA_SDMECLSATR-REFATTR, sy-vline,
  WA_SDMECLSATR-CHECKFLG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SDMECLSATR 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_SDMECLSATR 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_SDMECLSATR INTO WA_SDMECLSATR.


*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_SDMECLSATR_STR, 
CLSNAME TYPE STRING,
VERSION TYPE STRING,
ATTRNAME TYPE STRING,
EDITORDER TYPE STRING,
KEYFLG TYPE STRING,
PERSFLAG TYPE STRING,
TABFIELD TYPE STRING,
REFTYPE TYPE STRING,
REFCLASS TYPE STRING,
REFATTR TYPE STRING,
CHECKFLG TYPE STRING,
CHECKMTHD TYPE STRING,
VIRTATTR TYPE STRING,
READONLY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SDMECLSATR_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_SDMECLSATR_STR-CLSNAME sy-vline 
WA_SDMECLSATR_STR-VERSION sy-vline 
WA_SDMECLSATR_STR-ATTRNAME sy-vline 
WA_SDMECLSATR_STR-EDITORDER sy-vline 
WA_SDMECLSATR_STR-KEYFLG sy-vline 
WA_SDMECLSATR_STR-PERSFLAG sy-vline 
WA_SDMECLSATR_STR-TABFIELD sy-vline 
WA_SDMECLSATR_STR-REFTYPE sy-vline 
WA_SDMECLSATR_STR-REFCLASS sy-vline 
WA_SDMECLSATR_STR-REFATTR sy-vline 
WA_SDMECLSATR_STR-CHECKFLG sy-vline 
WA_SDMECLSATR_STR-CHECKMTHD sy-vline 
WA_SDMECLSATR_STR-VIRTATTR sy-vline 
WA_SDMECLSATR_STR-READONLY sy-vline      INTO ld_text SEPARATED BY SPACE.

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