ABAP Select data from SAP table INFST04 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP INFST04 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 INFST04. 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 INFST04 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_INFST04 TYPE STANDARD TABLE OF INFST04,
      WA_INFST04 TYPE INFST04,
      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: <INFST04> TYPE INFST04.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_INFST04.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM INFST04
  INTO TABLE IT_INFST04.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM INFST04
*  INTO TABLE @DATA(IT_INFST042).
*--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_INFST04 INDEX 1 INTO DATA(WA_INFST042).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_INFST04 ASSIGNING <INFST04>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<INFST04>-SHMTOTAL = 1.
<INFST04>-SHMRES = 1.
<INFST04>-SHMVIRT = 1.
<INFST04>-SHMMES = 1.
<INFST04>-PAGSIZE = 1.

ENDLOOP.

LOOP AT IT_INFST04 INTO WA_INFST04.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_INFST04-BUFFSIZE, sy-vline,
  WA_INFST04-BUFREADRAT, sy-vline,
  WA_INFST04-BUFWRITRAT, sy-vline,
  WA_INFST04-READS, sy-vline,
  WA_INFST04-WRITES, sy-vline,
  WA_INFST04-CLEANERS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_INFST04 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_INFST04 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_INFST04 INTO WA_INFST04.


*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_INFST04_STR, 
SHMTOTAL TYPE STRING,
SHMRES TYPE STRING,
SHMVIRT TYPE STRING,
SHMMES TYPE STRING,
PAGSIZE TYPE STRING,
BUFFSIZE TYPE STRING,
BUFREADRAT TYPE STRING,
BUFWRITRAT TYPE STRING,
READS TYPE STRING,
WRITES TYPE STRING,
CLEANERS TYPE STRING,
LRUS TYPE STRING,
LRUMAXDIRT TYPE STRING,
LRUMINDIRT TYPE STRING,
BUFFFLUSH TYPE STRING,
FOREWRITE TYPE STRING,
LRUWRITE TYPE STRING,
CHUNKWRITE TYPE STRING,
PHYSBUFF TYPE STRING,
LOGBUFF TYPE STRING,
PHYSWRITE TYPE STRING,
LOGWRITE TYPE STRING,
NUMCPUVPS TYPE STRING,
ACTIVESESS TYPE STRING,
ISCALL_MIN TYPE STRING,
ISCALLS_TR TYPE STRING,
ISCOMMITS TYPE STRING,
ISROLLBACK TYPE STRING,
ISAMTOT TYPE STRING,
SEQSCANS TYPE STRING,
CKPTINTVL TYPE STRING,
PHYSFILE TYPE STRING,
LOGSIZ TYPE STRING,
NUMCKPTS TYPE STRING,
CHKPTCORR TYPE STRING,
PHYSCORR TYPE STRING,
NUMAIOVPS TYPE STRING,
KAIOTHREAD TYPE STRING,
DBFILES TYPE STRING,
CURR_TIME TYPE STRING,
CURR_DATE TYPE STRING,
DB_UP_DAYS TYPE STRING,
DB_UP_HOUR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_INFST04_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_INFST04_STR-SHMTOTAL sy-vline 
WA_INFST04_STR-SHMRES sy-vline 
WA_INFST04_STR-SHMVIRT sy-vline 
WA_INFST04_STR-SHMMES sy-vline 
WA_INFST04_STR-PAGSIZE sy-vline 
WA_INFST04_STR-BUFFSIZE sy-vline 
WA_INFST04_STR-BUFREADRAT sy-vline 
WA_INFST04_STR-BUFWRITRAT sy-vline 
WA_INFST04_STR-READS sy-vline 
WA_INFST04_STR-WRITES sy-vline 
WA_INFST04_STR-CLEANERS sy-vline 
WA_INFST04_STR-LRUS sy-vline 
WA_INFST04_STR-LRUMAXDIRT sy-vline 
WA_INFST04_STR-LRUMINDIRT sy-vline 
WA_INFST04_STR-BUFFFLUSH sy-vline 
WA_INFST04_STR-FOREWRITE sy-vline 
WA_INFST04_STR-LRUWRITE sy-vline 
WA_INFST04_STR-CHUNKWRITE sy-vline 
WA_INFST04_STR-PHYSBUFF sy-vline 
WA_INFST04_STR-LOGBUFF sy-vline 
WA_INFST04_STR-PHYSWRITE sy-vline 
WA_INFST04_STR-LOGWRITE sy-vline 
WA_INFST04_STR-NUMCPUVPS sy-vline 
WA_INFST04_STR-ACTIVESESS sy-vline 
WA_INFST04_STR-ISCALL_MIN sy-vline 
WA_INFST04_STR-ISCALLS_TR sy-vline 
WA_INFST04_STR-ISCOMMITS sy-vline 
WA_INFST04_STR-ISROLLBACK sy-vline 
WA_INFST04_STR-ISAMTOT sy-vline 
WA_INFST04_STR-SEQSCANS sy-vline 
WA_INFST04_STR-CKPTINTVL sy-vline 
WA_INFST04_STR-PHYSFILE sy-vline 
WA_INFST04_STR-LOGSIZ sy-vline 
WA_INFST04_STR-NUMCKPTS sy-vline 
WA_INFST04_STR-CHKPTCORR sy-vline 
WA_INFST04_STR-PHYSCORR sy-vline 
WA_INFST04_STR-NUMAIOVPS sy-vline 
WA_INFST04_STR-KAIOTHREAD sy-vline 
WA_INFST04_STR-DBFILES sy-vline 
WA_INFST04_STR-CURR_TIME sy-vline 
WA_INFST04_STR-CURR_DATE sy-vline 
WA_INFST04_STR-DB_UP_DAYS sy-vline 
WA_INFST04_STR-DB_UP_HOUR sy-vline      INTO ld_text SEPARATED BY SPACE.

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