[#680,!426] Delete embedded shared network options when network is deleted.

src/share/database/scripts/mysql/dhcpdb_create.mysql

@@ -2377,17 +2377,19 @@ SET version = '8', minor = '1';
 
 # This line concludes database upgrade to version 8.1.
 
-# Do not perform cascade deletion of the data in the dhcp4_pool because
-# the cascade deletion does not execute triggers associated with the table.
-# Instead we are going to use triggers on the dhcp4_subnet table.
-ALTER TABLE dhcp4_pool
-    DROP FOREIGN KEY fk_dhcp4_pool_subnet_id;
-
-ALTER TABLE dhcp4_pool
-    ADD CONSTRAINT fk_dhcp4_pool_subnet_id FOREIGN KEY (subnet_id)
-    REFERENCES dhcp4_subnet (subnet_id)
-    ON DELETE NO ACTION ON UPDATE CASCADE;
+# Drop existing trigger on the dhcp4_shared_network table.
+DROP TRIGGER dhcp4_shared_network_ADEL;
 
+# Create new trigger which will delete options associated with the shared
+# network.
+DELIMITER $$
+CREATE TRIGGER dhcp4_shared_network_BDEL BEFORE DELETE ON dhcp4_shared_network
+    FOR EACH ROW
+    BEGIN
+        CALL createAuditEntryDHCP4('dhcp4_shared_network', OLD.id, "delete");
+        DELETE FROM dhcp4_options WHERE shared_network_name = OLD.name;
+    END $$
+DELIMITER ;
 
 # Drop existing trigger on the dhcp4_subnet table.
 DROP TRIGGER dhcp4_subnet_ADEL;
@@ -2404,6 +2406,47 @@ CREATE TRIGGER dhcp4_subnet_BDEL BEFORE DELETE ON dhcp4_subnet
     END $$
 DELIMITER ;
 
+# Do not perform cascade deletion of the data in the dhcp4_pool because
+# the cascade deletion does not execute triggers associated with the table.
+# Instead we are going to use triggers on the dhcp4_subnet table.
+ALTER TABLE dhcp4_pool
+    DROP FOREIGN KEY fk_dhcp4_pool_subnet_id;
+
+ALTER TABLE dhcp4_pool
+    ADD CONSTRAINT fk_dhcp4_pool_subnet_id FOREIGN KEY (subnet_id)
+    REFERENCES dhcp4_subnet (subnet_id)
+    ON DELETE NO ACTION ON UPDATE CASCADE;
+
+# Drop existing trigger on the dhcp6_shared_network table.
+DROP TRIGGER dhcp6_shared_network_ADEL;
+
+# Create new trigger which will delete options associated with the shared
+# network.
+DELIMITER $$
+CREATE TRIGGER dhcp6_shared_network_BDEL BEFORE DELETE ON dhcp6_shared_network
+    FOR EACH ROW
+    BEGIN
+        CALL createAuditEntryDHCP6('dhcp6_shared_network', OLD.id, "delete");
+        DELETE FROM dhcp6_options WHERE shared_network_name = OLD.name;
+    END $$
+DELIMITER ;
+
+# Drop existing trigger on the dhcp6_subnet table.
+DROP TRIGGER dhcp6_subnet_ADEL;
+
+# Create new trigger which will delete pools associated with the subnet and
+# the options associated with the subnet.
+DELIMITER $$
+CREATE TRIGGER dhcp6_subnet_BDEL BEFORE DELETE ON dhcp6_subnet
+    FOR EACH ROW
+    BEGIN
+        CALL createAuditEntryDHCP6('dhcp6_subnet', OLD.subnet_id, "delete");
+        DELETE FROM dhcp6_pool WHERE subnet_id = OLD.subnet_id;
+        DELETE FROM dhcp6_pd_pool WHERE subnet_id = OLD.subnet_id;
+        DELETE FROM dhcp6_options WHERE dhcp6_subnet_id = OLD.subnet_id;
+    END $$
+DELIMITER ;
+
 # Do not perform cascade deletion of the data in the dhcp6_pool and dhcp6_pd_pool
 # because the cascaded deletion does not execute triggers associated with the table.
 # Instead we are going to use triggers on the dhcp6_subnet table.
@@ -2433,23 +2476,6 @@ END
 $$
 DELIMITER ;
 
-# Drop existing trigger on the dhcp6_subnet table.
-DROP TRIGGER dhcp6_subnet_ADEL;
-
-# Create new trigger which will delete pools associated with the subnet and
-# the options associated with the subnet.
-DELIMITER $$
-CREATE TRIGGER dhcp6_subnet_BDEL BEFORE DELETE ON dhcp6_subnet
-    FOR EACH ROW
-    BEGIN
-        CALL createAuditEntryDHCP6('dhcp6_subnet', OLD.subnet_id, "delete");
-        DELETE FROM dhcp6_pool WHERE subnet_id = OLD.subnet_id;
-        DELETE FROM dhcp6_pd_pool WHERE subnet_id = OLD.subnet_id;
-        DELETE FROM dhcp6_options WHERE dhcp6_subnet_id = OLD.subnet_id;
-    END $$
-DELIMITER ;
-
-
 # Update the schema version number
 UPDATE schema_version
 SET version = '8', minor = '2';