-- Licensed to the Apache Software Foundation (ASF) under one or more
-- contributor license agreements.  See the NOTICE file distributed with
-- this work for additional information regarding copyright ownership.
-- The ASF licenses this file to You 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.

DECLARE
	v_count number:=0;
BEGIN
	select count(*) into v_count from user_tab_cols where table_name='X_POLICY' and column_name IN('NAME','SERVICE','ZONE_ID');
	if (v_count = 3) THEN
		v_count:=0;
		select count(*) into v_count from user_constraints where table_name='X_POLICY' and constraint_name='X_POLICY_UK_NAME_SERVICE' and constraint_type='U';
		if (v_count = 1) THEN
			v_count:=0;
			select count(*) into v_count from user_ind_columns WHERE table_name='X_POLICY' and column_name IN('NAME','SERVICE') and index_name='X_POLICY_UK_NAME_SERVICE';
			if (v_count = 2) THEN
				execute immediate 'ALTER TABLE X_POLICY DROP CONSTRAINT x_policy_UK_name_service';
			end if;
			commit;
			v_count:=0;
			select count(*) into v_count from user_constraints where table_name='X_POLICY' and constraint_name='X_POLICY_UK_NAME_SERVICE_ZONE' and constraint_type='U';
			if (v_count = 0) THEN
				v_count:=0;
				select count(*) into v_count from user_ind_columns WHERE table_name='X_POLICY' and column_name IN('NAME','SERVICE','ZONE_ID') and index_name='X_POLICY_UK_NAME_SERVICE_ZONE';
				if (v_count = 0) THEN
					execute immediate 'ALTER TABLE X_POLICY ADD CONSTRAINT x_policy_UK_name_service_zone UNIQUE (NAME,SERVICE,ZONE_ID)';
				end if;
				commit;
			end if;
		end if;
	end if;
END;/