CDS view注解解析 - @Environment.systemField

下面的CDS view使用到了@Environment.systemField这个注解，定义了两个参数#SYSTEM_LANGUAGE和#USER。

这个view从CRM物料主数据的产品抬头表COMM_PRODUCT读取product_id, product_type,以及comm_prshtext表里读取产品的描述信息，存储在字段description里。

 @AbapCatalog.sqlViewName: 'zprdtext' @AbapCatalog.compiler.compareFilter: true @AccessControl.authorizationCheck: #CHECK @EndUserText.label: 'Jerry product description' define view Zproductdescription with parameters @Consumption.hidden: true @Environment.systemField: #SYSTEM_LANGUAGE P_Language : syLangu, 
@Consumption.hidden: true @Environment.systemField : #USER p_uname : syst_uname as select from comm_product as product inner join comm_prshtext as _text on product.product_guid = _text.product_guid { key product.product_id, 
product.product_type, 
_text.short_text as description } where product.upname = :p_uname and _text.langu = :p_Language 

当我们在ABAP Development Studio里预览该view时, 我们会被要求给这两个参数指定值: