ABAP Select data from SAP table MDC_STXH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDC_STXH
*  INTO TABLE @DATA(IT_MDC_STXH2).
*--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_MDC_STXH INDEX 1 INTO DATA(WA_MDC_STXH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDC_STXH>-MANDT = 1.
<MDC_STXH>-TDOBJECT = 1.
<MDC_STXH>-TDNAME = 1.
<MDC_STXH>-TDID = 1.
<MDC_STXH>-TDSPRAS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDC_STXH-KEY1, sy-vline,
  WA_MDC_STXH-KEY2, sy-vline,
  WA_MDC_STXH-KEY3, sy-vline,
  WA_MDC_STXH-KEY4, sy-vline,
  WA_MDC_STXH-KEY5, sy-vline,
  WA_MDC_STXH-KEY6, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDC_STXH 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_MDC_STXH 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_MDC_STXH INTO WA_MDC_STXH.


*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.

*Conversion exit ISOLA, internal->external for field TDSPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MDC_STXH-TDSPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDC_STXH-TDSPRAS.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MDC_STXH_STR, 
MANDT TYPE STRING,
TDOBJECT TYPE STRING,
TDNAME TYPE STRING,
TDID TYPE STRING,
TDSPRAS TYPE STRING,
KEY1 TYPE STRING,
KEY2 TYPE STRING,
KEY3 TYPE STRING,
KEY4 TYPE STRING,
KEY5 TYPE STRING,
KEY6 TYPE STRING,
KEY7 TYPE STRING,
LONGTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDC_STXH_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_MDC_STXH_STR-MANDT sy-vline 
WA_MDC_STXH_STR-TDOBJECT sy-vline 
WA_MDC_STXH_STR-TDNAME sy-vline 
WA_MDC_STXH_STR-TDID sy-vline 
WA_MDC_STXH_STR-TDSPRAS sy-vline 
WA_MDC_STXH_STR-KEY1 sy-vline 
WA_MDC_STXH_STR-KEY2 sy-vline 
WA_MDC_STXH_STR-KEY3 sy-vline 
WA_MDC_STXH_STR-KEY4 sy-vline 
WA_MDC_STXH_STR-KEY5 sy-vline 
WA_MDC_STXH_STR-KEY6 sy-vline 
WA_MDC_STXH_STR-KEY7 sy-vline 
WA_MDC_STXH_STR-LONGTEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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