ABAP Select data from SAP table MDS_OBJH into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MDS_OBJH 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_OBJH. 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_OBJH 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_OBJH TYPE STANDARD TABLE OF MDS_OBJH,
      WA_MDS_OBJH TYPE MDS_OBJH,
      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_OBJH> TYPE MDS_OBJH.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDS_OBJH
*  INTO TABLE @DATA(IT_MDS_OBJH2).
*--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_OBJH INDEX 1 INTO DATA(WA_MDS_OBJH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDS_OBJH>-MT_ID = 1.
<MDS_OBJH>-OBJECTNAME = 1.
<MDS_OBJH>-OBJECTTYPE = 1.
<MDS_OBJH>-CLIDEP = 1.
<MDS_OBJH>-LANGDEP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDS_OBJH-ALEDEP, sy-vline,
  WA_MDS_OBJH-OBJCATEG, sy-vline,
  WA_MDS_OBJH-TRCOMPLETE, sy-vline,
  WA_MDS_OBJH-TRDISJUNCT, sy-vline,
  WA_MDS_OBJH-PHASELEVEL, sy-vline,
  WA_MDS_OBJH-LOCKMETH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDS_OBJH 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_OBJH 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_OBJH INTO WA_MDS_OBJH.


*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_OBJH_STR, 
MT_ID TYPE STRING,
OBJECTNAME TYPE STRING,
OBJECTTYPE TYPE STRING,
CLIDEP TYPE STRING,
LANGDEP TYPE STRING,
ALEDEP TYPE STRING,
OBJCATEG TYPE STRING,
TRCOMPLETE TYPE STRING,
TRDISJUNCT TYPE STRING,
PHASELEVEL TYPE STRING,
LOCKMETH TYPE STRING,
TADIRCMETH TYPE STRING,
CHECKID TYPE STRING,
OBJNAMELEN TYPE STRING,
PROTECT TYPE STRING,
OBJTRANSP TYPE STRING,
LUSER TYPE STRING,
LDATE TYPE STRING,
OBJNAMECLS TYPE STRING,
CURSETTING TYPE STRING,
OBJHASADDR TYPE STRING,
IMPORTABLE TYPE STRING,
OBJCHARSET TYPE STRING,
MCCATEGORY TYPE STRING,
MCDOCUID TYPE STRING,
NEW_CONT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDS_OBJH_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_OBJH_STR-MT_ID sy-vline 
WA_MDS_OBJH_STR-OBJECTNAME sy-vline 
WA_MDS_OBJH_STR-OBJECTTYPE sy-vline 
WA_MDS_OBJH_STR-CLIDEP sy-vline 
WA_MDS_OBJH_STR-LANGDEP sy-vline 
WA_MDS_OBJH_STR-ALEDEP sy-vline 
WA_MDS_OBJH_STR-OBJCATEG sy-vline 
WA_MDS_OBJH_STR-TRCOMPLETE sy-vline 
WA_MDS_OBJH_STR-TRDISJUNCT sy-vline 
WA_MDS_OBJH_STR-PHASELEVEL sy-vline 
WA_MDS_OBJH_STR-LOCKMETH sy-vline 
WA_MDS_OBJH_STR-TADIRCMETH sy-vline 
WA_MDS_OBJH_STR-CHECKID sy-vline 
WA_MDS_OBJH_STR-OBJNAMELEN sy-vline 
WA_MDS_OBJH_STR-PROTECT sy-vline 
WA_MDS_OBJH_STR-OBJTRANSP sy-vline 
WA_MDS_OBJH_STR-LUSER sy-vline 
WA_MDS_OBJH_STR-LDATE sy-vline 
WA_MDS_OBJH_STR-OBJNAMECLS sy-vline 
WA_MDS_OBJH_STR-CURSETTING sy-vline 
WA_MDS_OBJH_STR-OBJHASADDR sy-vline 
WA_MDS_OBJH_STR-IMPORTABLE sy-vline 
WA_MDS_OBJH_STR-OBJCHARSET sy-vline 
WA_MDS_OBJH_STR-MCCATEGORY sy-vline 
WA_MDS_OBJH_STR-MCDOCUID sy-vline 
WA_MDS_OBJH_STR-NEW_CONT sy-vline      INTO ld_text SEPARATED BY SPACE.

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