ABAP Select data from SAP table TST04HIST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TST04HIST 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 TST04HIST. 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 TST04HIST 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_TST04HIST TYPE STANDARD TABLE OF TST04HIST,
      WA_TST04HIST TYPE TST04HIST,
      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: <TST04HIST> TYPE TST04HIST.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TST04HIST.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TST04HIST
  INTO TABLE IT_TST04HIST.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TST04HIST
*  INTO TABLE @DATA(IT_TST04HIST2).
*--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_TST04HIST INDEX 1 INTO DATA(WA_TST04HIST2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TST04HIST ASSIGNING <TST04HIST>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TST04HIST>-BUFREADS = 1.
<TST04HIST>-DSKREADS = 1.
<TST04HIST>-BUFWRITES = 1.
<TST04HIST>-DSKWRITES = 1.
<TST04HIST>-LLGPAGEWRI = 1.

ENDLOOP.

LOOP AT IT_TST04HIST INTO WA_TST04HIST.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TST04HIST-FGWRITES, sy-vline,
  WA_TST04HIST-LRUWRITES, sy-vline,
  WA_TST04HIST-CHUNKWRITE, sy-vline,
  WA_TST04HIST-ISCOMMITS, sy-vline,
  WA_TST04HIST-ISROLLBACK, sy-vline,
  WA_TST04HIST-SEQSCANS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TST04HIST 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_TST04HIST 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_TST04HIST INTO WA_TST04HIST.


*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_TST04HIST_STR, 
BUFREADS TYPE STRING,
DSKREADS TYPE STRING,
BUFWRITES TYPE STRING,
DSKWRITES TYPE STRING,
LLGPAGEWRI TYPE STRING,
FGWRITES TYPE STRING,
LRUWRITES TYPE STRING,
CHUNKWRITE TYPE STRING,
ISCOMMITS TYPE STRING,
ISROLLBACK TYPE STRING,
SEQSCANS TYPE STRING,
NUMCKPTS TYPE STRING,
RA_USED TYPE STRING,
RA_COUNT TYPE STRING,
BUFWTS TYPE STRING,
ISAMREADS TYPE STRING,
ISAMSTARTS TYPE STRING,
MEMSORTS TYPE STRING,
DISKSORTS TYPE STRING,
LOCKWAITS TYPE STRING,
LOCKREQS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TST04HIST_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_TST04HIST_STR-BUFREADS sy-vline 
WA_TST04HIST_STR-DSKREADS sy-vline 
WA_TST04HIST_STR-BUFWRITES sy-vline 
WA_TST04HIST_STR-DSKWRITES sy-vline 
WA_TST04HIST_STR-LLGPAGEWRI sy-vline 
WA_TST04HIST_STR-FGWRITES sy-vline 
WA_TST04HIST_STR-LRUWRITES sy-vline 
WA_TST04HIST_STR-CHUNKWRITE sy-vline 
WA_TST04HIST_STR-ISCOMMITS sy-vline 
WA_TST04HIST_STR-ISROLLBACK sy-vline 
WA_TST04HIST_STR-SEQSCANS sy-vline 
WA_TST04HIST_STR-NUMCKPTS sy-vline 
WA_TST04HIST_STR-RA_USED sy-vline 
WA_TST04HIST_STR-RA_COUNT sy-vline 
WA_TST04HIST_STR-BUFWTS sy-vline 
WA_TST04HIST_STR-ISAMREADS sy-vline 
WA_TST04HIST_STR-ISAMSTARTS sy-vline 
WA_TST04HIST_STR-MEMSORTS sy-vline 
WA_TST04HIST_STR-DISKSORTS sy-vline 
WA_TST04HIST_STR-LOCKWAITS sy-vline 
WA_TST04HIST_STR-LOCKREQS sy-vline      INTO ld_text SEPARATED BY SPACE.

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