ABAP Select data from SAP table MDSUB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDSUB
*  INTO TABLE @DATA(IT_MDSUB2).
*--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_MDSUB INDEX 1 INTO DATA(WA_MDSUB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDSUB>-MANDT = 1.
<MDSUB>-UUID = 1.
<MDSUB>-OBJECT_TYPE = 1.
<MDSUB>-OBJECT = 1.
<MDSUB>-SUBSTITUTE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDSUB-CONTEXT_TYPE1, sy-vline,
  WA_MDSUB-CONTEXT1, sy-vline,
  WA_MDSUB-CONTEXT_TYPE2, sy-vline,
  WA_MDSUB-CONTEXT2, sy-vline,
  WA_MDSUB-GROUP_NAME, sy-vline,
  WA_MDSUB-VERSION, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDSUB 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_MDSUB 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_MDSUB INTO WA_MDSUB.


*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_MDSUB_STR, 
MANDT TYPE STRING,
UUID TYPE STRING,
OBJECT_TYPE TYPE STRING,
OBJECT TYPE STRING,
SUBSTITUTE TYPE STRING,
CONTEXT_TYPE1 TYPE STRING,
CONTEXT1 TYPE STRING,
CONTEXT_TYPE2 TYPE STRING,
CONTEXT2 TYPE STRING,
GROUP_NAME TYPE STRING,
VERSION TYPE STRING,
SET_ID TYPE STRING,
IS_EXIT TYPE STRING,
IS_LEAD TYPE STRING,
SEQUENCE TYPE STRING,
NUMERATOR TYPE STRING,
DENOMINATOR TYPE STRING,
PERCENT TYPE STRING,
VALID_FROM TYPE STRING,
VALID_TO TYPE STRING,
TIME_ZONE TYPE STRING,
REASON TYPE STRING,
STATUS TYPE STRING,
IS_ATP_PROD TYPE STRING,
IS_ATP_PLANT TYPE STRING,
IS_ESPP TYPE STRING,
IS_ATP_SLOC TYPE STRING,
IS_ATP_MRP_AREA TYPE STRING,
CREATED_BY TYPE STRING,
CREATED_AT TYPE STRING,
LAST_CHANGED_BY TYPE STRING,
LAST_CHANGED_AT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDSUB_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_MDSUB_STR-MANDT sy-vline 
WA_MDSUB_STR-UUID sy-vline 
WA_MDSUB_STR-OBJECT_TYPE sy-vline 
WA_MDSUB_STR-OBJECT sy-vline 
WA_MDSUB_STR-SUBSTITUTE sy-vline 
WA_MDSUB_STR-CONTEXT_TYPE1 sy-vline 
WA_MDSUB_STR-CONTEXT1 sy-vline 
WA_MDSUB_STR-CONTEXT_TYPE2 sy-vline 
WA_MDSUB_STR-CONTEXT2 sy-vline 
WA_MDSUB_STR-GROUP_NAME sy-vline 
WA_MDSUB_STR-VERSION sy-vline 
WA_MDSUB_STR-SET_ID sy-vline 
WA_MDSUB_STR-IS_EXIT sy-vline 
WA_MDSUB_STR-IS_LEAD sy-vline 
WA_MDSUB_STR-SEQUENCE sy-vline 
WA_MDSUB_STR-NUMERATOR sy-vline 
WA_MDSUB_STR-DENOMINATOR sy-vline 
WA_MDSUB_STR-PERCENT sy-vline 
WA_MDSUB_STR-VALID_FROM sy-vline 
WA_MDSUB_STR-VALID_TO sy-vline 
WA_MDSUB_STR-TIME_ZONE sy-vline 
WA_MDSUB_STR-REASON sy-vline 
WA_MDSUB_STR-STATUS sy-vline 
WA_MDSUB_STR-IS_ATP_PROD sy-vline 
WA_MDSUB_STR-IS_ATP_PLANT sy-vline 
WA_MDSUB_STR-IS_ESPP sy-vline 
WA_MDSUB_STR-IS_ATP_SLOC sy-vline 
WA_MDSUB_STR-IS_ATP_MRP_AREA sy-vline 
WA_MDSUB_STR-CREATED_BY sy-vline 
WA_MDSUB_STR-CREATED_AT sy-vline 
WA_MDSUB_STR-LAST_CHANGED_BY sy-vline 
WA_MDSUB_STR-LAST_CHANGED_AT sy-vline      INTO ld_text SEPARATED BY SPACE.

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