我不知道UUID
CDS 中有任何功能。您需要使用CDS Table Function
和AMDP
。
你的Table Function
看法。
define table function ZP_TF_TEST
with parameters @Environment.systemField: #CLIENT mandt : mandt
returns
{
mandt : mandt;
ID : uuid;
A : type_a;
B : type_b;
}
implemented by method zcl_tf_test=>get_data;
你的CDS
看法。
define view ZZ_TF_TEST as select from ZP_TF_TEST( mandt : $session.client )
{
key ID,
A,
B,
}
你的AMDP
课。
CLASS zcl_tf_test DEFINITION PUBLIC FINAL CREATE PUBLIC .
PUBLIC SECTION.
INTERFACES if_amdp_marker_hdb .
CLASS-METHODS get_data
FOR TABLE FUNCTION ZP_TF_TEST.
PROTECTED SECTION.
PRIVATE SECTION.
ENDCLASS.
实现方法get_data
并使用SELECT sysuuid FROM dummy
METHOD get_data BY DATABASE FUNCTION FOR HDB LANGUAGE SQLSCRIPT OPTIONS READ-ONLY USING my_table.
RETURN SELECT
a.mandt,
( SELECT sysuuid FROM dummy ) as id,
a.SomeField AS A,
b.SomeField AS B
from my_table as a inner join my_table as b
on a.ContextKey = b.ContextKey and a.DbKey != b.DbKey
where a.mandt= :mandt;
ENDMETHOD.