ABAP Select data from SAP table MSDDBSTATS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSDDBSTATS
*  INTO TABLE @DATA(IT_MSDDBSTATS2).
*--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_MSDDBSTATS INDEX 1 INTO DATA(WA_MSDDBSTATS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSDDBSTATS>-TABLENAME = 1.
<MSDDBSTATS>-TOTALROWS = 1.
<MSDDBSTATS>-DATASIZE = 1.
<MSDDBSTATS>-RESERVED = 1.
<MSDDBSTATS>-INDEXSIZE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSDDBSTATS-ROWMODCTR, sy-vline,
  WA_MSDDBSTATS-STATSSCHVER, sy-vline,
  WA_MSDDBSTATS-INDEXDEPTH, sy-vline,
  WA_MSDDBSTATS-NUMINDEXES, sy-vline,
  WA_MSDDBSTATS-NUMSTATS, sy-vline,
  WA_MSDDBSTATS-STATSDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSDDBSTATS 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_MSDDBSTATS 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_MSDDBSTATS INTO WA_MSDDBSTATS.


*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_MSDDBSTATS_STR, 
TABLENAME TYPE STRING,
TOTALROWS TYPE STRING,
DATASIZE TYPE STRING,
RESERVED TYPE STRING,
INDEXSIZE TYPE STRING,
ROWMODCTR TYPE STRING,
STATSSCHVER TYPE STRING,
INDEXDEPTH TYPE STRING,
NUMINDEXES TYPE STRING,
NUMSTATS TYPE STRING,
STATSDATE TYPE STRING,
TABLEOPTIONS TYPE STRING,
BUFFSTATUS TYPE STRING,
FILEGROUP TYPE STRING,
SCANDENSITY TYPE STRING,
LOGICALFRAG TYPE STRING,
NUMPAGES TYPE STRING,
BESTCOUNT TYPE STRING,
ACTUALCOUNT TYPE STRING,
AVGPGPEREX TYPE STRING,
EXTSCANFRG TYPE STRING,
AVGPGDSTF TYPE STRING,
MISC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSDDBSTATS_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_MSDDBSTATS_STR-TABLENAME sy-vline 
WA_MSDDBSTATS_STR-TOTALROWS sy-vline 
WA_MSDDBSTATS_STR-DATASIZE sy-vline 
WA_MSDDBSTATS_STR-RESERVED sy-vline 
WA_MSDDBSTATS_STR-INDEXSIZE sy-vline 
WA_MSDDBSTATS_STR-ROWMODCTR sy-vline 
WA_MSDDBSTATS_STR-STATSSCHVER sy-vline 
WA_MSDDBSTATS_STR-INDEXDEPTH sy-vline 
WA_MSDDBSTATS_STR-NUMINDEXES sy-vline 
WA_MSDDBSTATS_STR-NUMSTATS sy-vline 
WA_MSDDBSTATS_STR-STATSDATE sy-vline 
WA_MSDDBSTATS_STR-TABLEOPTIONS sy-vline 
WA_MSDDBSTATS_STR-BUFFSTATUS sy-vline 
WA_MSDDBSTATS_STR-FILEGROUP sy-vline 
WA_MSDDBSTATS_STR-SCANDENSITY sy-vline 
WA_MSDDBSTATS_STR-LOGICALFRAG sy-vline 
WA_MSDDBSTATS_STR-NUMPAGES sy-vline 
WA_MSDDBSTATS_STR-BESTCOUNT sy-vline 
WA_MSDDBSTATS_STR-ACTUALCOUNT sy-vline 
WA_MSDDBSTATS_STR-AVGPGPEREX sy-vline 
WA_MSDDBSTATS_STR-EXTSCANFRG sy-vline 
WA_MSDDBSTATS_STR-AVGPGDSTF sy-vline 
WA_MSDDBSTATS_STR-MISC sy-vline      INTO ld_text SEPARATED BY SPACE.

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