SAP CDS view如何取得当前系统日期和系统时间戳

取得当前系统日期 - 使用session变量$session. system_date

@AbapCatalog.sqlViewName: 'DEMO_CDS_DATTYM'
@AbapCatalog.compiler.compareFilter: true
@AccessControl.authorizationCheck: #NOT_REQUIRED
@EndUserText.label: 'DEMO'
@VDM.viewType: #BASIC
@Analytics.dataCategory: #FACT
@Analytics.dataExtraction.enabled: true
Define view demo_cds_date_time
  as select from demo
{
$session.system_date as systemdate
}

取得当前系统时间戳

@AbapCatalog.sqlViewName: 'DEMO_CDS_DATTYM'
@AbapCatalog.compiler.compareFilter: true
@AccessControl.authorizationCheck: #NOT_REQUIRED
@EndUserText.label: 'DEMO'
@VDM.viewType: #BASIC
@Analytics.dataCategory: #FACT
@Analytics.dataExtraction.enabled: true
Define view demo_cds_date_time
  as select from demo
{
tstmp_current_utctimestamp()
}