-- 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;
        gu_count number:=0;
BEGIN
        select count(*) into v_count from user_tab_cols where table_name='X_GROUP' and column_name='GROUP_NAME';
        if (v_count = 1) then
                v_count:=0;
                select count(*) into v_count from user_constraints where table_name='X_GROUP' and constraint_name='X_GROUP_UK_GROUP_NAME' 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_GROUP' and column_name='GROUP_NAME' and index_name='X_GROUP_UK_GROUP_NAME';
                        if (v_count = 0) then
                                execute immediate 'ALTER TABLE x_group MODIFY(group_name VARCHAR(767)) ADD CONSTRAINT x_group_UK_group_name UNIQUE (group_name)';
                        end if;
                        commit;
                end if;
        end if;

        select count(*) into gu_count from user_tab_cols where table_name='X_GROUP_USERS' and column_name='GROUP_NAME';
        if (gu_count = 1) then
                gu_count:=0;
                select count(*) into gu_count from user_constraints where table_name='X_GROUP_USERS' and constraint_name='X_GROUP_USERS_UK_UID_GNAME' and constraint_type='U';
                if (gu_count = 0) then
                        gu_count:=0;
                        select count(*) into gu_count from user_ind_columns WHERE table_name='X_GROUP_USERS' and column_name='GROUP_NAME' and index_name='X_GROUP_USERS_UK_UID_GNAME';
                        if (gu_count = 0) then
                                execute immediate 'ALTER TABLE x_group_users MODIFY(group_name VARCHAR(767)) ADD CONSTRAINT x_group_users_uk_uid_gname UNIQUE (user_id,group_name)';
                        end if;
                        commit;
                end if;
        end if;
end;/