SpringBoot05 数据操作02 -> JPA接口详解
概览
JpaRepository 继承 PagingAndSortingRepository 继承 CrudRepository 继承 Repository
1 Repository
这是一个空接口,主要是用来指定它的子接口是一个持久层接口
实现了Repository的接口默认就是一个持久层接口,会被容器管理起来;这就是为什么我们自己写的接口继承了JpaRepository后不用添加@Repository的原因
public interface Repository<T, ID extends Serializable> { }
Repository
2 CrudRepository
CrudRepository继承自Repository接口,该接口定义了一些简单的增删改查方法
/*
* Copyright 2008-2011 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 org.springframework.data.repository; import java.io.Serializable; /**
* Interface for generic CRUD operations on a repository for a specific type.
*
* @author Oliver Gierke
* @author Eberhard Wolff
*/
@NoRepositoryBean
public interface CrudRepository<T, ID extends Serializable> extends Repository<T, ID> { /**
* Saves a given entity. Use the returned instance for further operations as the save operation might have changed the
* entity instance completely.
*
* @param entity
* @return the saved entity
*/
<S extends T> S save(S entity); /**
* Saves all given entities.
*
* @param entities
* @return the saved entities
* @throws IllegalArgumentException in case the given entity is {@literal null}.
*/
<S extends T> Iterable<S> save(Iterable<S> entities); /**
* Retrieves an entity by its id.
*
* @param id must not be {@literal null}.
* @return the entity with the given id or {@literal null} if none found
* @throws IllegalArgumentException if {@code id} is {@literal null}
*/
T findOne(ID id); /**
* Returns whether an entity with the given id exists.
*
* @param id must not be {@literal null}.
* @return true if an entity with the given id exists, {@literal false} otherwise
* @throws IllegalArgumentException if {@code id} is {@literal null}
*/
boolean exists(ID id); /**
* Returns all instances of the type.
*
* @return all entities
*/
Iterable<T> findAll(); /**
* Returns all instances of the type with the given IDs.
*
* @param ids
* @return
*/
Iterable<T> findAll(Iterable<ID> ids); /**
* Returns the number of entities available.
*
* @return the number of entities
*/
long count(); /**
* Deletes the entity with the given id.
*
* @param id must not be {@literal null}.
* @throws IllegalArgumentException in case the given {@code id} is {@literal null}
*/
void delete(ID id); /**
* Deletes a given entity.
*
* @param entity
* @throws IllegalArgumentException in case the given entity is {@literal null}.
*/
void delete(T entity); /**
* Deletes the given entities.
*
* @param entities
* @throws IllegalArgumentException in case the given {@link Iterable} is {@literal null}.
*/
void delete(Iterable<? extends T> entities); /**
* Deletes all entities managed by the repository.
*/
void deleteAll();
}
CrudRepository
3 PagingAndSortingRepository
PagingAndSortingRepository继承自CrudRepository接口,该接口不仅有CrudRepository接口中的增删改查方法,还定义了分页查询方法和排序方法
/*
* Copyright 2008-2010 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 org.springframework.data.repository; import java.io.Serializable; import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort; /**
* Extension of {@link CrudRepository} to provide additional methods to retrieve entities using the pagination and
* sorting abstraction.
*
* @author Oliver Gierke
* @see Sort
* @see Pageable
* @see Page
*/
@NoRepositoryBean
public interface PagingAndSortingRepository<T, ID extends Serializable> extends CrudRepository<T, ID> { /**
* Returns all entities sorted by the given options.
*
* @param sort
* @return all entities sorted by the given options
*/
Iterable<T> findAll(Sort sort); /**
* Returns a {@link Page} of entities meeting the paging restriction provided in the {@code Pageable} object.
*
* @param pageable
* @return a page of entities
*/
Page<T> findAll(Pageable pageable);
}
PagingAndSortingRepository
4 JpaRepository
JpaRepository继承自PagingAndSortingRepository接口和QueryByExampleExecutor接口,该接口不仅有PagingAndSortingRepository中的方法还有QueryByExampleExecutor中定义的方法
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
// package org.springframework.data.jpa.repository; import java.io.Serializable;
import java.util.List;
import org.springframework.data.domain.Example;
import org.springframework.data.domain.Sort;
import org.springframework.data.repository.NoRepositoryBean;
import org.springframework.data.repository.PagingAndSortingRepository;
import org.springframework.data.repository.query.QueryByExampleExecutor; @NoRepositoryBean
public interface JpaRepository<T, ID extends Serializable> extends PagingAndSortingRepository<T, ID>, QueryByExampleExecutor<T> {
List<T> findAll(); List<T> findAll(Sort var1); List<T> findAll(Iterable<ID> var1); <S extends T> List<S> save(Iterable<S> var1); void flush(); <S extends T> S saveAndFlush(S var1); void deleteInBatch(Iterable<T> var1); void deleteAllInBatch(); T getOne(ID var1); <S extends T> List<S> findAll(Example<S> var1); <S extends T> List<S> findAll(Example<S> var1, Sort var2);
}
JpaRepository
1. 定义
JpaRepository接口中实现了一些简单的增删改查功能
@NoRepositoryBean
public interface JpaRepository<T, ID extends Serializable> extends PagingAndSortingRepository<T, ID>, QueryByExampleExecutor<T> {
List<T> findAll(); List<T> findAll(Sort var1); List<T> findAll(Iterable<ID> var1); <S extends T> List<S> save(Iterable<S> var1); void flush(); <S extends T> S saveAndFlush(S var1); void deleteInBatch(Iterable<T> var1); void deleteAllInBatch(); T getOne(ID var1); <S extends T> List<S> findAll(Example<S> var1); <S extends T> List<S> findAll(Example<S> var1, Sort var2);
}
JpaRepository
2 技巧
实现了JpaRepository后的接口会被容器自动进行管理
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