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ABAP CDS - session_variable

Other versions: 7.31 | 7.40 | 7.54


... $session.vname ...


Specifies a session variable vname in an operand position in a SELECT statement of a CDS view. The variable is case-sensitive. $session.vname, $Session.Vname, and $SESSION.VNAME can all be used. No other spellings are allowed.

Session variables have a predefined name and are set to a predefined value when the CDS view is used in ABAP SQL. This also applies to CDS views that are used as data sources in other CDS views. The following session variables exist:

vname Valued when accessed using ABAP SQL
user Current user name, nominalvalue of the ABAP system field sy-uname
client Current client. The defaultvalue is the nominal value of the ABAP system field sy-mandt. In reads with an ABAP SQL statement (with the addition USING CLIENT) and in calls of anAMDP method from ABAP (inwhose declaration the addition AMDP OPTIONS CDS SESSION CLIENT is specified, the value specified here.
system_language Text environment language of the currentinternal session,nominal value of the ABAP system field sy-langu
system_date Current system dateof the AS ABAP, nominal value of the ABAP system field sy-datum


  • From a technical perspective, session variables indicate global variables of the current database that are set to their value when the CDS view is used in ABAP SQL. If ABAP SQL is not used to access a CDS view with session variables, the content of the variables is undefined (with the exception of the SAP HANA database).

  • For input parameters of CDS views annotated with the special annotation environment.systemField, ABAP SQL can pass the values of the session variables specified here automatically too. It is generally preferable to use this type of local input parameter.

  • In existing CDS views without corresponding input parameters, session variables can be passed to the input parameters of CDS views or CDS table functions used there.

  • When the ABAP SQL statement SELECT is used to access a CDS view that uses the session client client, the addition USING CLIENT can be used and is respected in the session variable for the duration of the ABAP SQL statement. The additions USING [ALL] CLIENTS [IN] plus the obsolete addition CLIENT SPECIFIED cannot be used.

  • A CDS view that accesses a session variable directly or using a view cannot usually be buffered. Only client-specific views that access the session variable client directly can be buffered.


The following CDS view contains the possible session variables in the SELECT list. The program DEMO_CDS_SESSION_VARIABLES uses ABAP SQL to access the view and fills the session variables with the associated values. Here, it is possible to define whether USING CLIENT is used or not.

@AbapCatalog.sqlViewName: 'DEMO_CDS_SESSVAR'
@AccessControl.authorizationCheck: #NOT_ALLOWED
define view demo_cds_session_variables
  as select from
      $session.user            as system_user,
      $session.client          as system_client,
      $session.system_language as system_language,
      $session.system_date     as system_date


The following CDS view DEMO_CDS_SELECT_T100 accesses a further CDS view DEMO_CDS_SELECT_T100_LANGU with a language input parameter to which the annotation environment.systemField with the value system_language is assigned. Unlike in ABAP SQL, there is no implicit pass of the actual parameter to the input parameter here and the corresponding session variable $session.system_language is passed instead. The program DEMO_CDS_T100 uses ABAP SQL to access both views and the result is identical. When DEMO_CDS_SELECT_T100_LANGU is accessed, the value of the system field sy-langu is passed implicitly to the input parameter. When DEMO_CDS_SELECT_T100 is accessed, the session variable $session.system_language is filled with this value.

@AbapCatalog.sqlViewName: 'DEMO_CDS_T100'
@AccessControl.authorizationCheck: #NOT_REQUIRED
define view demo_cds_select_t100
as select from
demo_cds_select_t100_langu( p_langu: $session.system_language )
@AbapCatalog.sqlViewName: 'DEMO_CDS_T100_LG'
@AccessControl.authorizationCheck: #NOT_REQUIRED
define view demo_cds_select_t100_langu
with parameters
p_langu : lang
as select from
sprsl = :p_langu
and arbgb = 'SABAPDEMOS'