Java tutorial
/* * Copyright 2012-2013 the original author or 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 com.hd123.oauth2.repository; import java.util.Optional; import org.bson.types.ObjectId; import org.springframework.data.mongodb.repository.MongoRepository; import com.hd123.oauth2.entity.Product; /** * ??? * * @author liyue */ public interface ProductRepository extends MongoRepository<Product, ObjectId> { Optional<Product> findDistinctByName(String name); }