ABAP Select data from SAP table MSDTBSTATS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSDTBSTATS
*  INTO TABLE @DATA(IT_MSDTBSTATS2).
*--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_MSDTBSTATS INDEX 1 INTO DATA(WA_MSDTBSTATS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSDTBSTATS>-ANLYID = 1.
<MSDTBSTATS>-TABNAME = 1.
<MSDTBSTATS>-RESERVED = 1.
<MSDTBSTATS>-DATASIZE = 1.
<MSDTBSTATS>-INDEXSIZE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSDTBSTATS-UNUSEDSIZ, sy-vline,
  WA_MSDTBSTATS-TOTALROWS, sy-vline,
  WA_MSDTBSTATS-MINLEN, sy-vline,
  WA_MSDTBSTATS-MAXLEN, sy-vline,
  WA_MSDTBSTATS-ROWMODCTR, sy-vline,
  WA_MSDTBSTATS-SCHEMAVER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSDTBSTATS 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_MSDTBSTATS 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_MSDTBSTATS INTO WA_MSDTBSTATS.


*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_MSDTBSTATS_STR, 
ANLYID TYPE STRING,
TABNAME TYPE STRING,
RESERVED TYPE STRING,
DATASIZE TYPE STRING,
INDEXSIZE TYPE STRING,
UNUSEDSIZ TYPE STRING,
TOTALROWS TYPE STRING,
MINLEN TYPE STRING,
MAXLEN TYPE STRING,
ROWMODCTR TYPE STRING,
SCHEMAVER TYPE STRING,
SCANDENS TYPE STRING,
FILEGID TYPE STRING,
LASTCHUSER TYPE STRING,
LCHDATE TYPE STRING,
LCHTIME TYPE STRING,
BUFFERING TYPE STRING,
GENBUFFFLD TYPE STRING,
BUFSTATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSDTBSTATS_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_MSDTBSTATS_STR-ANLYID sy-vline 
WA_MSDTBSTATS_STR-TABNAME sy-vline 
WA_MSDTBSTATS_STR-RESERVED sy-vline 
WA_MSDTBSTATS_STR-DATASIZE sy-vline 
WA_MSDTBSTATS_STR-INDEXSIZE sy-vline 
WA_MSDTBSTATS_STR-UNUSEDSIZ sy-vline 
WA_MSDTBSTATS_STR-TOTALROWS sy-vline 
WA_MSDTBSTATS_STR-MINLEN sy-vline 
WA_MSDTBSTATS_STR-MAXLEN sy-vline 
WA_MSDTBSTATS_STR-ROWMODCTR sy-vline 
WA_MSDTBSTATS_STR-SCHEMAVER sy-vline 
WA_MSDTBSTATS_STR-SCANDENS sy-vline 
WA_MSDTBSTATS_STR-FILEGID sy-vline 
WA_MSDTBSTATS_STR-LASTCHUSER sy-vline 
WA_MSDTBSTATS_STR-LCHDATE sy-vline 
WA_MSDTBSTATS_STR-LCHTIME sy-vline 
WA_MSDTBSTATS_STR-BUFFERING sy-vline 
WA_MSDTBSTATS_STR-GENBUFFFLD sy-vline 
WA_MSDTBSTATS_STR-BUFSTATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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