SAP CDS SESSION VAR APPLICATION V2 Get Example source ABAP code based on a different SAP tableSAP Help
• bs_instance_id ABAP_CDS_SESS_VAR_V2
• bs_zone_id ABAP_CDS_SESS_VAR_V2
ABAP_CDS_DDL - CDS View Entity, Application Session Variables ABAP_SYNTAX ... $session.vname ... What does it do? session variable vname in an operand position in a SELECT statement of a CDS view entity. The variable must be prefixed by $session.. <(>vname<)>Value when accessed bs_instance_idInstance ID of the current business service instance. The returned value has the data type SSTRING. bs_zone_idZone ID of the current business service instance. The returned value has the data type SSTRING. ABAP_PREREQUISITE replacement object. That implies that the respective CDS view entity must not have any input parameters. Latest notes: From a technical perspective, session variables indicate global variables of the current database. Application session variables are set to their value by dedicated system programs using a special system class. Like ABAP system fields, they are modifiable from an ABAP program. However, they should not be changed in application programs. They should only be used for reads. Otherwise, important information for further program execution may be lost. The annotation environment.systemField is relevant for built-in session variables, but not for application session variables. In existing CDS view entities without corresponding input parameters, session variables can be passed to the input parameters of CDS view entities or CDS table functions used there. Application session variables are supported only in CDS view entities. However, it is possible to build a ABAP_CDS_V1_VIEW on top of a CDS view entity with application session variables. The information is passed on to the ABAP_CDS_V1_VIEW in this case. ABAP_RESTRICTIONS CDS view entities with application session variables cannot be used in AMDP, since AMDP does not support application session variables. The ADT function Data Preview does not work for CDS view entities with application session variables. Example ABAP Coding bs_instance_id in its SELECT list. The following program sets a value for this session variable, using the ABAP class CL_OSQL_EXTERNAL_CONTEXT. The class must be used within a procedure, otherwise an exception occurs.
