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This commit is contained in:
Koch
2022-10-05 16:20:16 +02:00
parent 7af4e94b69
commit 76195703f4
7 changed files with 133 additions and 101 deletions
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24
orders/db/_schema._cds Normal file
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@@ -0,0 +1,24 @@
using { Currency, User, managed, cuid } from '@sap/cds/common';
namespace sap.capire.orders;
entity Orders : cuid, managed {
OrderNo : String @title:'Order Number'; //> readable key
Items : Composition of many {
key ID : UUID;
product : Association to Products;
quantity : Integer;
title : String; //> intentionally replicated as snapshot from product.title
price : Double; //> materialized calculated field
};
buyer : User;
currency : Currency;
}
/** This is a stand-in for arbitrary ordered Products */
entity Products @(cds.persistence.skip:'always') {
key ID : String;
}
// this is to ensure we have filled-in currencies
using from '@capire/common';

0
orders/db/data/sap.capire.orders-Orders.csv → orders/db/data/sap.capire.orders-OrdersHeaders.csv
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8
orders/db/data/sap.capire.orders-Orders.Items.csv → orders/db/data/sap.capire.orders-OrdersItems.csv
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@@ -1,4 +1,4 @@
ID;up__ID;quantity;product_ID;title;price
58040e66-1dcd-4ffb-ab10-fdce32028b79;7e2f2640-6866-4dcf-8f4d-3027aa831cad;1;201;Wuthering Heights;11.11
64e718c9-ff99-47f1-8ca3-950c850777d4;7e2f2640-6866-4dcf-8f4d-3027aa831cad;1;271;Catweazle;15
e9641166-e050-4261-bfee-d1e797e6cb7f;64e718c9-ff99-47f1-8ca3-950c850777d4;2;252;Eleonora;28
ID;Header_ID;quantity;product_ID;title;price
58040e66-1dcd-4ffb-ab10-fdce32028b79;7e2f2640-6866-4dcf-8f4d-3027aa831cad;10;201;Wuthering Heights;11.11
64e718c9-ff99-47f1-8ca3-950c850777d4;7e2f2640-6866-4dcf-8f4d-3027aa831cad;501;271;Catweazle;15
e9641166-e050-4261-bfee-d1e797e6cb7f;64e718c9-ff99-47f1-8ca3-950c850777d4;499;252;Eleonora;28
1 ID up__ID Header_ID quantity product_ID title price
2 58040e66-1dcd-4ffb-ab10-fdce32028b79 7e2f2640-6866-4dcf-8f4d-3027aa831cad 7e2f2640-6866-4dcf-8f4d-3027aa831cad 1 10 201 Wuthering Heights 11.11
3 64e718c9-ff99-47f1-8ca3-950c850777d4 7e2f2640-6866-4dcf-8f4d-3027aa831cad 7e2f2640-6866-4dcf-8f4d-3027aa831cad 1 501 271 Catweazle 15
4 e9641166-e050-4261-bfee-d1e797e6cb7f 64e718c9-ff99-47f1-8ca3-950c850777d4 64e718c9-ff99-47f1-8ca3-950c850777d4 2 499 252 Eleonora 28

82
orders/db/performance_example_schema.cds
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@@ -1,82 +0,0 @@
using { Currency, User, managed, cuid } from '@sap/cds/common';
using {Orders, OrderItems} from '../schema';
namespace sap.capire.orders;
entity OrdersHeaders : managed {
key ID : UUID;
OrderNo : String @title:'Order Number'; //> readable key
buyer : User;
currency : Currency;
Items : Composition of many OrdersItems on Items.Header = $self;
}
entity OrdersItems {
key ID : UUID;
product : Association to Products;
quantity : Integer;
title : String; //> intentionally replicated as snapshot from product.title
price : Double; //> materialized calculated field
Header : Association to OrdersHeaders;
};
// static
view OrdersItemsViewJoin as select
OrdersHeaders.ID as Header_ID,
OrdersHeaders.OrderNo as OrderNo,
OrdersHeaders.buyer as buyer,
OrdersHeaders.currency as currency,
OrdersItems.ID as Item_ID,
OrdersItems.product as product,
OrdersItems.quantity as quantity,
OrdersItems.title as title,
OrdersItems.price as price
from OrdersHeaders JOIN OrdersItems on OrdersHeaders.ID = OrdersItems.Header;
// dynamic entity
entity OrderItemsViewAssoc as projection on Orders;
// sort on right table
view SortedOrdersJoin as select
OrdersHeaders.ID as Header_ID,
OrdersHeaders.OrderNo as OrderNo,
OrdersHeaders.buyer as buyer,
OrdersHeaders.currency as currency,
OrdersItems.ID as Item_ID,
OrdersItems.product as product,
OrdersItems.quantity as quantity,
OrdersItems.title as title,
OrdersItems.price as price
from OrdersHeaders JOIN OrdersItems on OrdersHeaders.ID = OrdersItems.Header
order by title;
// sort on items and join back to header via assoc
view SortedOrdersAssoc as select
from OrdersItems {*, Header.OrderNo, Header.buyer, Header.currency }
order by OrdersItems.title;
// filter on right table
view FilteredOrdersJoin as select
OrdersHeaders.ID as Header_ID,
OrdersHeaders.OrderNo as OrderNo,
OrdersHeaders.buyer as buyer,
OrdersHeaders.currency as currency,
OrdersItems.ID as Item_ID,
OrdersItems.product as product,
OrdersItems.quantity as quantity,
OrdersItems.title as title,
OrdersItems.price as price
from OrdersHeaders JOIN OrdersItems on OrdersHeaders.ID = OrdersItems.Header
where price > 100;
// filter on items and join back to header via assoc
view FilteredOrdersAssoc as select
from OrdersItems {*, Header.OrderNo, Header.buyer, Header.currency }
where OrdersItems.price > 100;

36
orders/db/schema.cds
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@@ -1,24 +1,32 @@
using { Currency, User, managed, cuid } from '@sap/cds/common';
// using {Orders, OrderItems} from './schema';
namespace sap.capire.orders;
entity Orders : cuid, managed {
OrderNo : String @title:'Order Number'; //> readable key
Items : Composition of many {
entity Products {
key ID : String;
}
entity OrdersHeaders : managed {
key ID : UUID;
OrderNo : String @title:'Order Number'; //> readable key
buyer : User;
currency : Currency;
Items : Composition of many OrdersItems on Items.Header = $self;
}
entity OrdersItems {
key ID : UUID;
product : Association to Products;
quantity : Integer;
title : String; //> intentionally replicated as snapshot from product.title
price : Double; //> materialized calculated field
};
buyer : User;
currency : Currency;
}
/** This is a stand-in for arbitrary ordered Products */
entity Products @(cds.persistence.skip:'always') {
key ID : String;
}
Header : Association to OrdersHeaders;
};
// this is to ensure we have filled-in currencies
using from '@capire/common';

0
orders/srv/performance_example_orders-service.cds → orders/srv/_performance_example_orders-service._cds
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84
orders/srv/orders-service.cds
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@@ -1,5 +1,87 @@
using { sap.capire.orders as my } from '../db/schema';
service OrdersService {
entity Orders as projection on my.Orders;
entity OrdersHeaders as projection on my.OrdersHeaders;
entity OrdersItems as projection on my.OrdersItems;
entity Products as projection on my.Products;
// static
view OrdersItemsViewJoin as select
OrdersHeaders.ID as Header_ID,
OrdersHeaders.OrderNo as OrderNo,
OrdersHeaders.buyer as buyer,
OrdersHeaders.currency as currency,
key OrdersItems.ID as Item_ID,
OrdersItems.product as product,
OrdersItems.quantity as quantity,
OrdersItems.title as title,
OrdersItems.price as price
from OrdersHeaders JOIN OrdersItems on OrdersHeaders.ID = OrdersItems.Header.ID;
// dynamic entity
entity OrderItemsViewAssoc as projection on OrdersHeaders;
// sort on right table
view SortedOrdersJoin as select
OrdersHeaders.ID as Header_ID,
OrdersHeaders.OrderNo as OrderNo,
OrdersHeaders.buyer as buyer,
OrdersHeaders.currency as currency,
key OrdersItems.ID as Item_ID,
OrdersItems.product as product,
OrdersItems.quantity as quantity,
OrdersItems.title as title,
OrdersItems.price as price
from OrdersHeaders JOIN OrdersItems on OrdersHeaders.ID = OrdersItems.Header.ID
order by title;
// sort on items and join back to header via assoc
view SortedOrdersAssoc as select
from OrdersItems {*, Header.OrderNo, Header.buyer, Header.currency }
order by OrdersItems.title;
// filter on right table
view FilteredOrdersJoin as select
OrdersHeaders.ID as Header_ID,
OrdersHeaders.OrderNo as OrderNo,
OrdersHeaders.buyer as buyer,
OrdersHeaders.currency as currency,
key OrdersItems.ID as Item_ID,
OrdersItems.product as product,
OrdersItems.quantity as quantity,
OrdersItems.title as title,
OrdersItems.price as price
from OrdersHeaders JOIN OrdersItems on OrdersHeaders.ID = OrdersItems.Header.ID
where price > 100;
// filter on items and join back to header via assoc
view FilteredOrdersAssoc as select
from OrdersItems {*, Header.OrderNo, Header.buyer, Header.currency }
where OrdersItems.price > 100;
// TODO avoid CASE and/or JOIN: Denormalization of expensive complex structures,
// calculate on write instead of read
// CASE -> try to remodel to avoid CASE, if re-modelling is not possible,
// fill redundant fields at write
entity OrdersItemsCaseView as projection on OrdersItems {
*,
case
when quantity > 500 then 'Large'
when quantity > 100 then 'Medium'
else 'Small'
end as category : String
};
}