added InsertRepository for Relation Dao

+/**
+ * Copyright © 2016-2020 The Thingsboard Authors
+ *
+ * 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.
+ */
+package org.thingsboard.server.dao.sql.relation;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.jpa.repository.Modifying;
+import org.thingsboard.server.dao.model.sql.RelationEntity;
+
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
+import javax.persistence.Query;
+
+@Slf4j
+public abstract class AbstractRelationInsertRepository implements RelationInsertRepository {
+
+    @PersistenceContext
+    protected EntityManager entityManager;
+
+    protected Query getQuery(RelationEntity entity, String query) {
+        Query nativeQuery = entityManager.createNativeQuery(query, RelationEntity.class);
+        if (entity.getAdditionalInfo().isNull()) {
+            nativeQuery.setParameter("additionalInfo", null);
+        } else {
+            nativeQuery.setParameter("additionalInfo", entity.getAdditionalInfo().asText());
+        }
+        return nativeQuery
+                .setParameter("fromId", entity.getFromId())
+                .setParameter("fromType", entity.getFromType())
+                .setParameter("toId", entity.getToId())
+                .setParameter("toType", entity.getToType())
+                .setParameter("relationTypeGroup", entity.getRelationTypeGroup())
+                .setParameter("relationType", entity.getRelationType());
+    }
+
+    @Modifying
+    protected abstract RelationEntity processSaveOrUpdate(RelationEntity entity);
+
+}
\ No newline at end of file

+/**
+ * Copyright © 2016-2020 The Thingsboard Authors
+ *
+ * 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.
+ */
+package org.thingsboard.server.dao.sql.relation;
+
+import org.springframework.stereotype.Repository;
+import org.springframework.transaction.annotation.Transactional;
+import org.thingsboard.server.dao.model.sql.RelationCompositeKey;
+import org.thingsboard.server.dao.model.sql.RelationEntity;
+import org.thingsboard.server.dao.util.HsqlDao;
+import org.thingsboard.server.dao.util.SqlDao;
+
+@HsqlDao
+@SqlDao
+@Repository
+@Transactional
+public class HsqlRelationInsertRepository extends AbstractRelationInsertRepository implements RelationInsertRepository {
+
+    private static final String INSERT_ON_CONFLICT_DO_UPDATE = "MERGE INTO relation USING (VALUES :fromId, :fromType, :toId, :toType, :relationTypeGroup, :relationType, :additionalInfo) R " +
+            "(from_id, from_type, to_id, to_type, relation_type_group, relation_type, additional_info) " +
+            "ON (relation.from_id = R.from_id AND relation.from_type = R.from_type AND relation.relation_type_group = R.relation_type_group AND relation.relation_type = R.relation_type AND relation.to_id = R.to_id AND relation.to_type = R.to_type) " +
+            "WHEN MATCHED THEN UPDATE SET relation.additional_info = R.additional_info " +
+            "WHEN NOT MATCHED THEN INSERT (from_id, from_type, to_id, to_type, relation_type_group, relation_type, additional_info) VALUES (R.from_id, R.from_type, R.to_id, R.to_type, R.relation_type_group, R.relation_type, R.additional_info)";
+
+    @Override
+    public RelationEntity saveOrUpdate(RelationEntity entity) {
+        return processSaveOrUpdate(entity);
+    }
+
+    @Override
+    protected RelationEntity processSaveOrUpdate(RelationEntity entity) {
+        getQuery(entity, INSERT_ON_CONFLICT_DO_UPDATE).executeUpdate();
+        return entityManager.find(RelationEntity.class, new RelationCompositeKey(entity.toData()));
+    }
+}

@@ -56,6 +56,9 @@ public class JpaRelationDao extends JpaAbstractDaoListeningExecutorService imple
     @Autowired
     private RelationRepository relationRepository;
 
+    @Autowired
+    private RelationInsertRepository relationInsertRepository;
+
     @Override
     public ListenableFuture<List<EntityRelation>> findAllByFrom(TenantId tenantId, EntityId from, RelationTypeGroup typeGroup) {
         return service.submit(() -> DaoUtil.convertDataList(
@@ -117,12 +120,12 @@ public class JpaRelationDao extends JpaAbstractDaoListeningExecutorService imple
 
     @Override
     public boolean saveRelation(TenantId tenantId, EntityRelation relation) {
-        return relationRepository.save(new RelationEntity(relation)) != null;
+        return relationInsertRepository.saveOrUpdate(new RelationEntity(relation)) != null;
     }
 
     @Override
     public ListenableFuture<Boolean> saveRelationAsync(TenantId tenantId, EntityRelation relation) {
-        return service.submit(() -> relationRepository.save(new RelationEntity(relation)) != null);
+        return service.submit(() -> relationInsertRepository.saveOrUpdate(new RelationEntity(relation)) != null);
     }
 
     @Override

+/**
+ * Copyright © 2016-2020 The Thingsboard Authors
+ *
+ * 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.
+ */
+package org.thingsboard.server.dao.sql.relation;
+
+import org.springframework.stereotype.Repository;
+import org.springframework.transaction.annotation.Transactional;
+import org.thingsboard.server.dao.model.sql.RelationEntity;
+import org.thingsboard.server.dao.util.PsqlDao;
+import org.thingsboard.server.dao.util.SqlDao;
+
+@PsqlDao
+@SqlDao
+@Repository
+@Transactional
+public class PsqlRelationInsertRepository extends AbstractRelationInsertRepository implements RelationInsertRepository {
+
+    private static final String INSERT_ON_CONFLICT_DO_UPDATE = "INSERT INTO relation (from_id, from_type, to_id, to_type, relation_type_group, relation_type, additional_info)" +
+            " VALUES (:fromId, :fromType, :toId, :toType, :relationTypeGroup, :relationType, :additionalInfo) " +
+            "ON CONFLICT (from_id, from_type, relation_type_group, relation_type, to_id, to_type) DO UPDATE SET additional_info = :additionalInfo returning *";
+
+    @Override
+    public RelationEntity saveOrUpdate(RelationEntity entity) {
+        return processSaveOrUpdate(entity);
+    }
+
+    @Override
+    protected RelationEntity processSaveOrUpdate(RelationEntity entity) {
+        return (RelationEntity) getQuery(entity, INSERT_ON_CONFLICT_DO_UPDATE).getSingleResult();
+    }
+}

+/**
+ * Copyright © 2016-2020 The Thingsboard Authors
+ *
+ * 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.
+ */
+package org.thingsboard.server.dao.sql.relation;
+
+import org.thingsboard.server.dao.model.sql.RelationEntity;
+
+public interface RelationInsertRepository {
+
+    RelationEntity saveOrUpdate(RelationEntity entity);
+
+}
\ No newline at end of file