ABAP Select data from SAP table MSS_SESSION into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSS_SESSION
*  INTO TABLE @DATA(IT_MSS_SESSION2).
*--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_MSS_SESSION INDEX 1 INTO DATA(WA_MSS_SESSION2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSS_SESSION>-SESSIONID = 1.
<MSS_SESSION>-LOGINTIME = 1.
<MSS_SESSION>-HOSTNAME = 1.
<MSS_SESSION>-PROGNAME = 1.
<MSS_SESSION>-HOSTPID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSS_SESSION-CLIENTINFVER, sy-vline,
  WA_MSS_SESSION-CLIENTINFNAME, sy-vline,
  WA_MSS_SESSION-LOGINNAME, sy-vline,
  WA_MSS_SESSION-NTDOMAIN, sy-vline,
  WA_MSS_SESSION-NTUNAME, sy-vline,
  WA_MSS_SESSION-CPUTIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSS_SESSION 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_MSS_SESSION 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_MSS_SESSION INTO WA_MSS_SESSION.


*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_MSS_SESSION_STR, 
SESSIONID TYPE STRING,
LOGINTIME TYPE STRING,
HOSTNAME TYPE STRING,
PROGNAME TYPE STRING,
HOSTPID TYPE STRING,
CLIENTINFVER TYPE STRING,
CLIENTINFNAME TYPE STRING,
LOGINNAME TYPE STRING,
NTDOMAIN TYPE STRING,
NTUNAME TYPE STRING,
CPUTIME TYPE STRING,
MEMUSAGE TYPE STRING,
TTLSCHEDTIME TYPE STRING,
TTLELAPSEDTIME TYPE STRING,
SESS_NUMREADS TYPE STRING,
SESS_NUMWRITES TYPE STRING,
SESS_NUMLOGICALREADS TYPE STRING,
TRXISOLEVEL TYPE STRING,
ORIGLOGINNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSS_SESSION_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_MSS_SESSION_STR-SESSIONID sy-vline 
WA_MSS_SESSION_STR-LOGINTIME sy-vline 
WA_MSS_SESSION_STR-HOSTNAME sy-vline 
WA_MSS_SESSION_STR-PROGNAME sy-vline 
WA_MSS_SESSION_STR-HOSTPID sy-vline 
WA_MSS_SESSION_STR-CLIENTINFVER sy-vline 
WA_MSS_SESSION_STR-CLIENTINFNAME sy-vline 
WA_MSS_SESSION_STR-LOGINNAME sy-vline 
WA_MSS_SESSION_STR-NTDOMAIN sy-vline 
WA_MSS_SESSION_STR-NTUNAME sy-vline 
WA_MSS_SESSION_STR-CPUTIME sy-vline 
WA_MSS_SESSION_STR-MEMUSAGE sy-vline 
WA_MSS_SESSION_STR-TTLSCHEDTIME sy-vline 
WA_MSS_SESSION_STR-TTLELAPSEDTIME sy-vline 
WA_MSS_SESSION_STR-SESS_NUMREADS sy-vline 
WA_MSS_SESSION_STR-SESS_NUMWRITES sy-vline 
WA_MSS_SESSION_STR-SESS_NUMLOGICALREADS sy-vline 
WA_MSS_SESSION_STR-TRXISOLEVEL sy-vline 
WA_MSS_SESSION_STR-ORIGLOGINNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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