ABAP Select data from SAP table DB2NETWSTATS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2NETWSTATS 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 DB2NETWSTATS. 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 DB2NETWSTATS 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_DB2NETWSTATS TYPE STANDARD TABLE OF DB2NETWSTATS,
      WA_DB2NETWSTATS TYPE DB2NETWSTATS,
      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: <DB2NETWSTATS> TYPE DB2NETWSTATS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2NETWSTATS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2NETWSTATS
  INTO TABLE IT_DB2NETWSTATS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2NETWSTATS
*  INTO TABLE @DATA(IT_DB2NETWSTATS2).
*--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_DB2NETWSTATS INDEX 1 INTO DATA(WA_DB2NETWSTATS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2NETWSTATS ASSIGNING <DB2NETWSTATS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2NETWSTATS>-INTERVALEND = 1.
<DB2NETWSTATS>-APPSERVER = 1.
<DB2NETWSTATS>-WP = 1.
<DB2NETWSTATS>-WPTYPE = 1.
<DB2NETWSTATS>-INTERVALLENGTH = 1.

ENDLOOP.

LOOP AT IT_DB2NETWSTATS INTO WA_DB2NETWSTATS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2NETWSTATS-INVOCATIONS, sy-vline,
  WA_DB2NETWSTATS-SERVINVOCATIONS, sy-vline,
  WA_DB2NETWSTATS-SERVERTIME, sy-vline,
  WA_DB2NETWSTATS-ROUNDTRIPTIME, sy-vline,
  WA_DB2NETWSTATS-BYTESSENT, sy-vline,
  WA_DB2NETWSTATS-BYTESRECEIVED, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2NETWSTATS 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_DB2NETWSTATS 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_DB2NETWSTATS INTO WA_DB2NETWSTATS.


*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_DB2NETWSTATS_STR, 
INTERVALEND TYPE STRING,
APPSERVER TYPE STRING,
WP TYPE STRING,
WPTYPE TYPE STRING,
INTERVALLENGTH TYPE STRING,
INVOCATIONS TYPE STRING,
SERVINVOCATIONS TYPE STRING,
SERVERTIME TYPE STRING,
ROUNDTRIPTIME TYPE STRING,
BYTESSENT TYPE STRING,
BYTESRECEIVED TYPE STRING,
ROUNDTRIPS TYPE STRING,
NETWORKTIME TYPE STRING,
AVGROUNDTIME TYPE STRING,
MINNETWORKTIME TYPE STRING,
MAXNETWORKTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2NETWSTATS_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_DB2NETWSTATS_STR-INTERVALEND sy-vline 
WA_DB2NETWSTATS_STR-APPSERVER sy-vline 
WA_DB2NETWSTATS_STR-WP sy-vline 
WA_DB2NETWSTATS_STR-WPTYPE sy-vline 
WA_DB2NETWSTATS_STR-INTERVALLENGTH sy-vline 
WA_DB2NETWSTATS_STR-INVOCATIONS sy-vline 
WA_DB2NETWSTATS_STR-SERVINVOCATIONS sy-vline 
WA_DB2NETWSTATS_STR-SERVERTIME sy-vline 
WA_DB2NETWSTATS_STR-ROUNDTRIPTIME sy-vline 
WA_DB2NETWSTATS_STR-BYTESSENT sy-vline 
WA_DB2NETWSTATS_STR-BYTESRECEIVED sy-vline 
WA_DB2NETWSTATS_STR-ROUNDTRIPS sy-vline 
WA_DB2NETWSTATS_STR-NETWORKTIME sy-vline 
WA_DB2NETWSTATS_STR-AVGROUNDTIME sy-vline 
WA_DB2NETWSTATS_STR-MINNETWORKTIME sy-vline 
WA_DB2NETWSTATS_STR-MAXNETWORKTIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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