如何計算CDS view裡兩個時間戳之間的天數間隔
阿新 • • 發佈:2018-11-01
ABAP透明表裡的時間戳,資料型別為dec:
有個需求:計算這兩個時間戳之間的天數間隔,丟棄時間戳年-月-日8位後面的小時:分鐘:秒。
舉個例子:如果時間戳是20180918173132,丟棄173132,只保留20180918, 然後再計算天數間隔。
直接用CDS view的字串操作函式substring是不行的,因為時間戳型別dec和substring期待的字串型別不匹配。
解決方案:
先將時間戳欄位型別從dec強制轉換成abap.dats:
@AbapCatalog.sqlViewName: 'zproday'
@AbapCatalog.compiler.compareFilter: true
@AccessControl.authorizationCheck: #CHECK
@EndUserText.label: 'Day between'
define view zdate_day_between as select from comm_product {
key comm_product.product_id as prod_id,
comm_product.product_guid as prod_guid,
comm_product.valid_from as valid_from,
comm_product.valid_to as valid_to,
cast(substring(cast(valid_from as abap.char(32)),1,8) as abap.dats) as from_date,
cast(substring(cast(valid_to as abap.char(32)),1,8) as abap.dats) as to_date
}
然後再用CDS view標準的時間處理函式DATS_DAYS_BETWEEN:
@AbapCatalog.sqlViewName: 'zdbetw'
@AbapCatalog.compiler.compareFilter: true
@AccessControl.authorizationCheck: #CHECK
@EndUserText.label: 'Day between'
define view zc_date_day_between as select from zdate_day_between as host{
key host.prod_guid,
host.prod_id,
host.from_date,
host.to_date,
DATS_DAYS_BETWEEN(host.from_date, host.to_date) as no_of_days
}
測試結果:
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