ABAP Select data from SAP table MSSCOLLCOUNTERS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSSCOLLCOUNTERS
*  INTO TABLE @DATA(IT_MSSCOLLCOUNTERS2).
*--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_MSSCOLLCOUNTERS INDEX 1 INTO DATA(WA_MSSCOLLCOUNTERS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSSCOLLCOUNTERS>-PGWRITEWAITMS = 1.
<MSSCOLLCOUNTERS>-IOSTALLREADSRV = 1.
<MSSCOLLCOUNTERS>-IOSTALLWRITESRV = 1.
<MSSCOLLCOUNTERS>-IOSTALLREADDB = 1.
<MSSCOLLCOUNTERS>-IOSTALLWRITEDB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSSCOLLCOUNTERS-LOGWRITEWAITMS, sy-vline,
  WA_MSSCOLLCOUNTERS-LOGFLUSHWAITMS, sy-vline,
  WA_MSSCOLLCOUNTERS-LOGFLUSHS, sy-vline,
  WA_MSSCOLLCOUNTERS-LOGFLUSHSDB, sy-vline,
  WA_MSSCOLLCOUNTERS-LOGFLUSHSSRV, sy-vline,
  WA_MSSCOLLCOUNTERS-PHYSREADSDB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSSCOLLCOUNTERS 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_MSSCOLLCOUNTERS 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_MSSCOLLCOUNTERS INTO WA_MSSCOLLCOUNTERS.


*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_MSSCOLLCOUNTERS_STR, 
PGWRITEWAITMS TYPE STRING,
IOSTALLREADSRV TYPE STRING,
IOSTALLWRITESRV TYPE STRING,
IOSTALLREADDB TYPE STRING,
IOSTALLWRITEDB TYPE STRING,
LOGWRITEWAITMS TYPE STRING,
LOGFLUSHWAITMS TYPE STRING,
LOGFLUSHS TYPE STRING,
LOGFLUSHSDB TYPE STRING,
LOGFLUSHSSRV TYPE STRING,
PHYSREADSDB TYPE STRING,
PHYSWRITESDB TYPE STRING,
PHYSREADSSRV TYPE STRING,
PHYSWRITESSRV TYPE STRING,
BUFPGWAITMS TYPE STRING,
BUFPGLOOKUPS TYPE STRING,
BUFPGREADS TYPE STRING,
BUFPGWRITES TYPE STRING,
PAGEREADSPLKP TYPE STRING,
READAHEADS TYPE STRING,
READ_READAHEADS TYPE STRING,
CPUBUSY TYPE STRING,
CPUIDLE TYPE STRING,
IOBUSY TYPE STRING,
CPUINFO TYPE STRING,
LAZYWRITES TYPE STRING,
BUFHITRATIO TYPE STRING,
CACHEHITRATIO TYPE STRING,
LOCKWAITMS TYPE STRING,
LOCKESCAL TYPE STRING,
LOCKREQ TYPE STRING,
LATCHWAITMS TYPE STRING,
FULLSCANS TYPE STRING,
CHECKPOINTWAITS TYPE STRING,
CHECKPOINTPGS TYPE STRING,
TOTALMEM TYPE STRING,
SQLCACHEMEM TYPE STRING,
CURRMEM TYPE STRING,
LOCKMEM TYPE STRING,
CONNMEM TYPE STRING,
OPTMEM TYPE STRING,
TARGETMEM TYPE STRING,
DATABASEPGS TYPE STRING,
FREEPAGES TYPE STRING,
PROCCACHEPGS TYPE STRING,
CACHEPGS TYPE STRING,
TOTALBUFPGS TYPE STRING,
CACHEOBJCNT TYPE STRING,
TRANSACTIONS TYPE STRING,
ACTTRANSACTIONS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSSCOLLCOUNTERS_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_MSSCOLLCOUNTERS_STR-PGWRITEWAITMS sy-vline 
WA_MSSCOLLCOUNTERS_STR-IOSTALLREADSRV sy-vline 
WA_MSSCOLLCOUNTERS_STR-IOSTALLWRITESRV sy-vline 
WA_MSSCOLLCOUNTERS_STR-IOSTALLREADDB sy-vline 
WA_MSSCOLLCOUNTERS_STR-IOSTALLWRITEDB sy-vline 
WA_MSSCOLLCOUNTERS_STR-LOGWRITEWAITMS sy-vline 
WA_MSSCOLLCOUNTERS_STR-LOGFLUSHWAITMS sy-vline 
WA_MSSCOLLCOUNTERS_STR-LOGFLUSHS sy-vline 
WA_MSSCOLLCOUNTERS_STR-LOGFLUSHSDB sy-vline 
WA_MSSCOLLCOUNTERS_STR-LOGFLUSHSSRV sy-vline 
WA_MSSCOLLCOUNTERS_STR-PHYSREADSDB sy-vline 
WA_MSSCOLLCOUNTERS_STR-PHYSWRITESDB sy-vline 
WA_MSSCOLLCOUNTERS_STR-PHYSREADSSRV sy-vline 
WA_MSSCOLLCOUNTERS_STR-PHYSWRITESSRV sy-vline 
WA_MSSCOLLCOUNTERS_STR-BUFPGWAITMS sy-vline 
WA_MSSCOLLCOUNTERS_STR-BUFPGLOOKUPS sy-vline 
WA_MSSCOLLCOUNTERS_STR-BUFPGREADS sy-vline 
WA_MSSCOLLCOUNTERS_STR-BUFPGWRITES sy-vline 
WA_MSSCOLLCOUNTERS_STR-PAGEREADSPLKP sy-vline 
WA_MSSCOLLCOUNTERS_STR-READAHEADS sy-vline 
WA_MSSCOLLCOUNTERS_STR-READ_READAHEADS sy-vline 
WA_MSSCOLLCOUNTERS_STR-CPUBUSY sy-vline 
WA_MSSCOLLCOUNTERS_STR-CPUIDLE sy-vline 
WA_MSSCOLLCOUNTERS_STR-IOBUSY sy-vline 
WA_MSSCOLLCOUNTERS_STR-CPUINFO sy-vline 
WA_MSSCOLLCOUNTERS_STR-LAZYWRITES sy-vline 
WA_MSSCOLLCOUNTERS_STR-BUFHITRATIO sy-vline 
WA_MSSCOLLCOUNTERS_STR-CACHEHITRATIO sy-vline 
WA_MSSCOLLCOUNTERS_STR-LOCKWAITMS sy-vline 
WA_MSSCOLLCOUNTERS_STR-LOCKESCAL sy-vline 
WA_MSSCOLLCOUNTERS_STR-LOCKREQ sy-vline 
WA_MSSCOLLCOUNTERS_STR-LATCHWAITMS sy-vline 
WA_MSSCOLLCOUNTERS_STR-FULLSCANS sy-vline 
WA_MSSCOLLCOUNTERS_STR-CHECKPOINTWAITS sy-vline 
WA_MSSCOLLCOUNTERS_STR-CHECKPOINTPGS sy-vline 
WA_MSSCOLLCOUNTERS_STR-TOTALMEM sy-vline 
WA_MSSCOLLCOUNTERS_STR-SQLCACHEMEM sy-vline 
WA_MSSCOLLCOUNTERS_STR-CURRMEM sy-vline 
WA_MSSCOLLCOUNTERS_STR-LOCKMEM sy-vline 
WA_MSSCOLLCOUNTERS_STR-CONNMEM sy-vline 
WA_MSSCOLLCOUNTERS_STR-OPTMEM sy-vline 
WA_MSSCOLLCOUNTERS_STR-TARGETMEM sy-vline 
WA_MSSCOLLCOUNTERS_STR-DATABASEPGS sy-vline 
WA_MSSCOLLCOUNTERS_STR-FREEPAGES sy-vline 
WA_MSSCOLLCOUNTERS_STR-PROCCACHEPGS sy-vline 
WA_MSSCOLLCOUNTERS_STR-CACHEPGS sy-vline 
WA_MSSCOLLCOUNTERS_STR-TOTALBUFPGS sy-vline 
WA_MSSCOLLCOUNTERS_STR-CACHEOBJCNT sy-vline 
WA_MSSCOLLCOUNTERS_STR-TRANSACTIONS sy-vline 
WA_MSSCOLLCOUNTERS_STR-ACTTRANSACTIONS sy-vline      INTO ld_text SEPARATED BY SPACE.

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