ABAP Select data from SAP table GST04 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP GST04 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 GST04. 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 GST04 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_GST04 TYPE STANDARD TABLE OF GST04,
      WA_GST04 TYPE GST04,
      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: <GST04> TYPE GST04.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_GST04.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM GST04
  INTO TABLE IT_GST04.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GST04
*  INTO TABLE @DATA(IT_GST042).
*--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_GST04 INDEX 1 INTO DATA(WA_GST042).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_GST04 ASSIGNING <GST04>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GST04>-DB_NAME = 1.
<GST04>-DB_UP_DATE = 1.
<GST04>-DB_UP_TIME = 1.
<GST04>-BUFSIZE = 1.
<GST04>-BUFREADS = 1.

ENDLOOP.

LOOP AT IT_GST04 INTO WA_GST04.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GST04-BUFQUAL, sy-vline,
  WA_GST04-BUFPWRITES, sy-vline,
  WA_GST04-BUFPREADS, sy-vline,
  WA_GST04-BUFWAITS, sy-vline,
  WA_GST04-BUFWTIME, sy-vline,
  WA_GST04-DICTSIZE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GST04 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_GST04 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_GST04 INTO WA_GST04.


*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_GST04_STR, 
DB_NAME TYPE STRING,
DB_UP_DATE TYPE STRING,
DB_UP_TIME TYPE STRING,
BUFSIZE TYPE STRING,
BUFREADS TYPE STRING,
BUFQUAL TYPE STRING,
BUFPWRITES TYPE STRING,
BUFPREADS TYPE STRING,
BUFWAITS TYPE STRING,
BUFWTIME TYPE STRING,
DICTSIZE TYPE STRING,
DDQUAL TYPE STRING,
GETRATIO TYPE STRING,
PINRATIO TYPE STRING,
LOGSIZE TYPE STRING,
LOGENTRIES TYPE STRING,
LOGALLOC TYPE STRING,
LOGFAULT TYPE STRING,
USERCALLS TYPE STRING,
RECURCALLS TYPE STRING,
COMMITS TYPE STRING,
PARSES TYPE STRING,
ROLLBACKS TYPE STRING,
LOGWRITES TYPE STRING,
LOGWTIME TYPE STRING,
LOGBLOCKS TYPE STRING,
LOGWSIZE TYPE STRING,
LOGLATCH TYPE STRING,
SCANSHORT TYPE STRING,
SCANLONG TYPE STRING,
SCANROWS TYPE STRING,
SCANBLOCKS TYPE STRING,
FETCHROWID TYPE STRING,
FETCHCONT TYPE STRING,
SORTMEM TYPE STRING,
SORTDISK TYPE STRING,
SORTROWS TYPE STRING,
CPUUSAGE TYPE STRING,
CPUCALLS TYPE STRING,
CPURECURS TYPE STRING,
CPUPARSE TYPE STRING,
USERTOREC TYPE STRING,
READCALLRA TYPE STRING,
DD_GETS TYPE STRING,
DD_GET_MIS TYPE STRING,
CONSISTGET TYPE STRING,
GLOBLCKCON TYPE STRING,
LCKHITRATI TYPE STRING,
DBWRCROSSI TYPE STRING,
PINGWRITES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GST04_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_GST04_STR-DB_NAME sy-vline 
WA_GST04_STR-DB_UP_DATE sy-vline 
WA_GST04_STR-DB_UP_TIME sy-vline 
WA_GST04_STR-BUFSIZE sy-vline 
WA_GST04_STR-BUFREADS sy-vline 
WA_GST04_STR-BUFQUAL sy-vline 
WA_GST04_STR-BUFPWRITES sy-vline 
WA_GST04_STR-BUFPREADS sy-vline 
WA_GST04_STR-BUFWAITS sy-vline 
WA_GST04_STR-BUFWTIME sy-vline 
WA_GST04_STR-DICTSIZE sy-vline 
WA_GST04_STR-DDQUAL sy-vline 
WA_GST04_STR-GETRATIO sy-vline 
WA_GST04_STR-PINRATIO sy-vline 
WA_GST04_STR-LOGSIZE sy-vline 
WA_GST04_STR-LOGENTRIES sy-vline 
WA_GST04_STR-LOGALLOC sy-vline 
WA_GST04_STR-LOGFAULT sy-vline 
WA_GST04_STR-USERCALLS sy-vline 
WA_GST04_STR-RECURCALLS sy-vline 
WA_GST04_STR-COMMITS sy-vline 
WA_GST04_STR-PARSES sy-vline 
WA_GST04_STR-ROLLBACKS sy-vline 
WA_GST04_STR-LOGWRITES sy-vline 
WA_GST04_STR-LOGWTIME sy-vline 
WA_GST04_STR-LOGBLOCKS sy-vline 
WA_GST04_STR-LOGWSIZE sy-vline 
WA_GST04_STR-LOGLATCH sy-vline 
WA_GST04_STR-SCANSHORT sy-vline 
WA_GST04_STR-SCANLONG sy-vline 
WA_GST04_STR-SCANROWS sy-vline 
WA_GST04_STR-SCANBLOCKS sy-vline 
WA_GST04_STR-FETCHROWID sy-vline 
WA_GST04_STR-FETCHCONT sy-vline 
WA_GST04_STR-SORTMEM sy-vline 
WA_GST04_STR-SORTDISK sy-vline 
WA_GST04_STR-SORTROWS sy-vline 
WA_GST04_STR-CPUUSAGE sy-vline 
WA_GST04_STR-CPUCALLS sy-vline 
WA_GST04_STR-CPURECURS sy-vline 
WA_GST04_STR-CPUPARSE sy-vline 
WA_GST04_STR-USERTOREC sy-vline 
WA_GST04_STR-READCALLRA sy-vline 
WA_GST04_STR-DD_GETS sy-vline 
WA_GST04_STR-DD_GET_MIS sy-vline 
WA_GST04_STR-CONSISTGET sy-vline 
WA_GST04_STR-GLOBLCKCON sy-vline 
WA_GST04_STR-LCKHITRATI sy-vline 
WA_GST04_STR-DBWRCROSSI sy-vline 
WA_GST04_STR-PINGWRITES sy-vline      INTO ld_text SEPARATED BY SPACE.

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