spring RowsFetchSpec 源码
spring RowsFetchSpec 代码
文件路径：/spring-r2dbc/src/main/java/org/springframework/r2dbc/core/RowsFetchSpec.java
/*
* Copyright 2002-2020 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
*
* https://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.springframework.r2dbc.core;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
/**
* Contract for fetching tabular results.
*
* @author Mark Paluch
* @since 5.3
* @param <T> the row result type
*/
public interface RowsFetchSpec<T> {
/**
* Get exactly zero or one result.
* @return a Mono emitting one element, or {@link Mono#empty()} if no match found.
* Completes with {@code IncorrectResultSizeDataAccessException} if more than one match found
*/
Mono<T> one();
/**
* Get the first or no result.
* @return a Mono emitting the first element, or {@link Mono#empty()} if no match found
*/
Mono<T> first();
/**
* Get all matching elements.
* @return a Flux emitting all results
*/
Flux<T> all();
}
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