ABAP Select data from SAP table MDS_CMPT_DISPLAY_STRUCTURE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDS_CMPT_DISPLAY_STRUCTURE
*  INTO TABLE @DATA(IT_MDS_CMPT_DISPLAY_STRUCTURE2).
*--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_MDS_CMPT_DISPLAY_STRUCTURE INDEX 1 INTO DATA(WA_MDS_CMPT_DISPLAY_STRUCTURE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDS_CMPT_DISPLAY_STRUCTURE>-SOURCE_OBJECT = 1.
<MDS_CMPT_DISPLAY_STRUCTURE>-TARGET_OBJECT = 1.
<MDS_CMPT_DISPLAY_STRUCTURE>-CONSISTENT = 1.
<MDS_CMPT_DISPLAY_STRUCTURE>-DATA = 1.
<MDS_CMPT_DISPLAY_STRUCTURE>-ADDRESS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDS_CMPT_DISPLAY_STRUCTURE-GENERAL, sy-vline,
  WA_MDS_CMPT_DISPLAY_STRUCTURE-POSTAL, sy-vline,
  WA_MDS_CMPT_DISPLAY_STRUCTURE-REMARKS, sy-vline,
  WA_MDS_CMPT_DISPLAY_STRUCTURE-VERSIONS, sy-vline,
  WA_MDS_CMPT_DISPLAY_STRUCTURE-COMMUNICATION, sy-vline,
  WA_MDS_CMPT_DISPLAY_STRUCTURE-PHONE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDS_CMPT_DISPLAY_STRUCTURE 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_MDS_CMPT_DISPLAY_STRUCTURE 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_MDS_CMPT_DISPLAY_STRUCTURE INTO WA_MDS_CMPT_DISPLAY_STRUCTURE.


*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_MDS_CMPT_DISPLAY_STRUCTURE_STR, 
SOURCE_OBJECT TYPE STRING,
TARGET_OBJECT TYPE STRING,
CONSISTENT TYPE STRING,
DATA TYPE STRING,
ADDRESS TYPE STRING,
GENERAL TYPE STRING,
POSTAL TYPE STRING,
REMARKS TYPE STRING,
VERSIONS TYPE STRING,
COMMUNICATION TYPE STRING,
PHONE TYPE STRING,
CONTACT TYPE STRING,
REMARKS TYPE STRING,
FAX TYPE STRING,
CONTACT TYPE STRING,
REMARKS TYPE STRING,
TTX TYPE STRING,
CONTACT TYPE STRING,
REMARKS TYPE STRING,
TLX TYPE STRING,
CONTACT TYPE STRING,
REMARKS TYPE STRING,
SMTP TYPE STRING,
CONTACT TYPE STRING,
REMARKS TYPE STRING,
REMOTE_MAIL_ADD TYPE STRING,
CONTACT TYPE STRING,
REMARKS TYPE STRING,
X400 TYPE STRING,
CONTACT TYPE STRING,
REMARKS TYPE STRING,
RFC TYPE STRING,
CONTACT TYPE STRING,
REMARKS TYPE STRING,
PRT TYPE STRING,
CONTACT TYPE STRING,
REMARKS TYPE STRING,
SSF TYPE STRING,
CONTACT TYPE STRING,
REMARKS TYPE STRING,
URI TYPE STRING,
CONTACT TYPE STRING,
REMARKS TYPE STRING,
PAGER TYPE STRING,
CONTACT TYPE STRING,
REMARKS TYPE STRING,
STATUS TYPE STRING,
TAX TYPE STRING,
DATA TYPE STRING,
STATUS TYPE STRING,
BANK TYPE STRING,
DATA TYPE STRING,
STATUS TYPE STRING,
CREDIT TYPE STRING,
DATA TYPE STRING,
STATUS TYPE STRING,
INDUSTRY TYPE STRING,
DATA TYPE STRING,
STATUS TYPE STRING,
RELATIONSHIP TYPE STRING,
DATA TYPE STRING,
STATUS TYPE STRING,
TRADING_PARTNER TYPE STRING,
DATA TYPE STRING,
STATUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDS_CMPT_DISPLAY_STRUCTURE_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_MDS_CMPT_DISPLAY_STRUCTURE_STR-SOURCE_OBJECT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-TARGET_OBJECT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-CONSISTENT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-DATA sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-ADDRESS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-GENERAL sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-POSTAL sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-REMARKS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-VERSIONS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-COMMUNICATION sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-PHONE sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-CONTACT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-REMARKS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-FAX sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-CONTACT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-REMARKS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-TTX sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-CONTACT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-REMARKS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-TLX sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-CONTACT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-REMARKS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-SMTP sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-CONTACT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-REMARKS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-REMOTE_MAIL_ADD sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-CONTACT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-REMARKS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-X400 sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-CONTACT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-REMARKS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-RFC sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-CONTACT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-REMARKS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-PRT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-CONTACT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-REMARKS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-SSF sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-CONTACT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-REMARKS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-URI sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-CONTACT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-REMARKS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-PAGER sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-CONTACT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-REMARKS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-STATUS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-TAX sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-DATA sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-STATUS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-BANK sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-DATA sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-STATUS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-CREDIT sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-DATA sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-STATUS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-INDUSTRY sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-DATA sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-STATUS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-RELATIONSHIP sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-DATA sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-STATUS sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-TRADING_PARTNER sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-DATA sy-vline 
WA_MDS_CMPT_DISPLAY_STRUCTURE_STR-STATUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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