ABAP Select data from SAP table SYBMON_CACHEPOOL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SYBMON_CACHEPOOL
*  INTO TABLE @DATA(IT_SYBMON_CACHEPOOL2).
*--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_SYBMON_CACHEPOOL INDEX 1 INTO DATA(WA_SYBMON_CACHEPOOL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SYBMON_CACHEPOOL>-CACHEID = 1.
<SYBMON_CACHEPOOL>-INSTANCEID = 1.
<SYBMON_CACHEPOOL>-IOBUFFERSIZE = 1.
<SYBMON_CACHEPOOL>-PHYSICALREADS = 1.
<SYBMON_CACHEPOOL>-STALLS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SYBMON_CACHEPOOL-PAGESTOUCHED, sy-vline,
  WA_SYBMON_CACHEPOOL-PAGESREAD, sy-vline,
  WA_SYBMON_CACHEPOOL-BUFFERSTOMRU, sy-vline,
  WA_SYBMON_CACHEPOOL-BUFFERSTOLRU, sy-vline,
  WA_SYBMON_CACHEPOOL-CACHENAME, sy-vline,
  WA_SYBMON_CACHEPOOL-SNAPSHOT_TIMESTAMP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SYBMON_CACHEPOOL 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_SYBMON_CACHEPOOL 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_SYBMON_CACHEPOOL INTO WA_SYBMON_CACHEPOOL.


*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_SYBMON_CACHEPOOL_STR, 
CACHEID TYPE STRING,
INSTANCEID TYPE STRING,
IOBUFFERSIZE TYPE STRING,
PHYSICALREADS TYPE STRING,
STALLS TYPE STRING,
PAGESTOUCHED TYPE STRING,
PAGESREAD TYPE STRING,
BUFFERSTOMRU TYPE STRING,
BUFFERSTOLRU TYPE STRING,
CACHENAME TYPE STRING,
SNAPSHOT_TIMESTAMP TYPE STRING,
TIMESTAMP_FROM TYPE STRING,
TIMESTAMP_TO TYPE STRING,
TIME_PERIOD TYPE STRING,
IOBUFFERSIZE_GUI TYPE STRING,
LOGICALREADS TYPE STRING,
PHYSICALWRITES TYPE STRING,
APFREADS TYPE STRING,
HIT_RATIO TYPE STRING,
RUNSIZE TYPE STRING,
SOURCE_HOSTNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SYBMON_CACHEPOOL_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_SYBMON_CACHEPOOL_STR-CACHEID sy-vline 
WA_SYBMON_CACHEPOOL_STR-INSTANCEID sy-vline 
WA_SYBMON_CACHEPOOL_STR-IOBUFFERSIZE sy-vline 
WA_SYBMON_CACHEPOOL_STR-PHYSICALREADS sy-vline 
WA_SYBMON_CACHEPOOL_STR-STALLS sy-vline 
WA_SYBMON_CACHEPOOL_STR-PAGESTOUCHED sy-vline 
WA_SYBMON_CACHEPOOL_STR-PAGESREAD sy-vline 
WA_SYBMON_CACHEPOOL_STR-BUFFERSTOMRU sy-vline 
WA_SYBMON_CACHEPOOL_STR-BUFFERSTOLRU sy-vline 
WA_SYBMON_CACHEPOOL_STR-CACHENAME sy-vline 
WA_SYBMON_CACHEPOOL_STR-SNAPSHOT_TIMESTAMP sy-vline 
WA_SYBMON_CACHEPOOL_STR-TIMESTAMP_FROM sy-vline 
WA_SYBMON_CACHEPOOL_STR-TIMESTAMP_TO sy-vline 
WA_SYBMON_CACHEPOOL_STR-TIME_PERIOD sy-vline 
WA_SYBMON_CACHEPOOL_STR-IOBUFFERSIZE_GUI sy-vline 
WA_SYBMON_CACHEPOOL_STR-LOGICALREADS sy-vline 
WA_SYBMON_CACHEPOOL_STR-PHYSICALWRITES sy-vline 
WA_SYBMON_CACHEPOOL_STR-APFREADS sy-vline 
WA_SYBMON_CACHEPOOL_STR-HIT_RATIO sy-vline 
WA_SYBMON_CACHEPOOL_STR-RUNSIZE sy-vline 
WA_SYBMON_CACHEPOOL_STR-SOURCE_HOSTNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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