View to read pre- and post evening event participants, extend organiz…

…er odata service sapmentors#23

odataorganizer/procedures/PrePostEveningEventNumbersRead.hdbview

@@ -0,0 +1,45 @@
+//
+//   Copyright 2016 SAP Mentors
+//   Licensed under the Apache License, Version 2.0 (the "License");
+//   you may not use this file except in compliance with the License.
+//   You may obtain a copy of the License at
+//
+//       http://www.apache.org/licenses/LICENSE-2.0
+//
+//   Unless required by applicable law or agreed to in writing, software
+//   distributed under the License is distributed on an "AS IS" BASIS,
+//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//   See the License for the specific language governing permissions and
+//   limitations under the License.
+//
+
+//
+// Thanks to the Blog: OData read exits - a delightful solution
+// http://scn.sap.com/community/developer-center/hana/blog/2016/01/14/odata-read-exits--an-ingenious-solution
+//
+schema = "SITREG";
+query = "SELECT 
+        \"Event\".\"ID\"                                    AS \"EventID\", 
+        \"PreEveningEvent\".\"PreEveningEvent\"             AS \"PreEveningEvent\",
+        \"PostEveningEvent\".\"PostEveningEvent\"            AS \"PostEveningEvent\"
+        FROM \"SITREG\".\"com.sap.sapmentors.sitreg.data::SITreg.Event\" AS \"Event\"
+        LEFT OUTER JOIN ( 
+            SELECT \"EventID\", COUNT(*) AS \"PreEveningEvent\" 
+              FROM \"SITREG\".\"com.sap.sapmentors.sitreg.data::SITreg.Participant\"
+              WHERE \"PreEveningEvent\" = 'Y'
+              GROUP BY \"EventID\" ) AS \"PreEveningEvent\"
+          ON \"Event\".\"ID\" = \"PreEveningEvent\".\"EventID\"
+        LEFT OUTER JOIN ( 
+            SELECT \"EventID\", COUNT(*) AS \"PostEveningEvent\" 
+              FROM \"SITREG\".\"com.sap.sapmentors.sitreg.data::SITreg.Participant\"
+              WHERE \"PostEveningEvent\" = 'Y'
+              GROUP BY \"EventID\" ) AS \"PostEveningEvent\"
+          ON \"Event\".\"ID\" = \"PostEveningEvent\".\"EventID\"
+        GROUP BY 
+            \"PreEveningEvent\".\"PreEveningEvent\",
+            \"PostEveningEvent\".\"PostEveningEvent\", 
+            \"Event\".\"MaxParticipants\", 
+            \"Event\".\"ID\";";
+// Using an hdbtablefunction does not work as it would need SELECT authorization on the Participant table
+// query = "select * from \"com.sap.sapmentors.sitreg.odataparticipant.procedures::RegistrationNumbersReadFunc\"()";
+// depends_on_view=["com.sap.sapmentors.sitreg.odataparticipant.procedures::RegistrationNumbersReadFunc"];

odataorganizer/service.xsodata

@@ -22,7 +22,8 @@ service  {
         "Events_Participants"       as "Participants",
         "Events_CoOrganizers"       as "CoOrganizers",
         "Event_Changeable"          as "EventChangeable", 
-        "Event_RegistrationNumbers" as "RegistrationNumbers"
+        "Event_RegistrationNumbers" as "RegistrationNumbers",
+        "Event_PrePostEveningEventNumbers" as "PrePostEveningEventNumbers"
     )
     create using "com.sap.sapmentors.sitreg.odataorganizer.procedures::EventCreate" 
     update using "com.sap.sapmentors.sitreg.odataorganizer.procedures::EventUpdate"
@@ -61,4 +62,11 @@ service  {
     association "Event_RegistrationNumbers" principal "Events"("ID") multiplicity "1"
         dependent "RegistrationNumbers"("EventID") multiplicity "1";
 
+    "com.sap.sapmentors.sitreg.odataorganizer.procedures::PrePostEveningEventNumbersRead" as "PrePostEveningEventNumbers" key ("EventID")
+    create forbidden
+    update forbidden
+    delete forbidden;
+
+    association "Event_PrePostEveningEventNumbers" principal "Events"("ID") multiplicity "1"
+        dependent "PrePostEveningEventNumbers"("EventID") multiplicity "1";
 }