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Spring Data JPA @EnableJpaRepositories配置詳解

@EnableJpaRepositories注解用於Srping JPA的代碼配置,用於取代xml形式的配置文件,@EnableJpaRepositories支持的配置形式豐富多用,本篇文章詳細講解。

1、簡單配置

1 @EnableJpaRepositories("com.spr.repository")

簡單配置支持多個package,格式如下:

1 @EnableJpaRepositories({"com.cshtong.sample.repository", "com.cshtong.tower.repository"})

2、單值和多組值配置方式

大部分注解可以都支持單個注解方式和多個注解,多個注解通常采用"{}"符號包含的一組數據。

比如:字符串形式的  "x.y.z"  =>  {"x.y.z","a.b.c"}

類別: A.class => {A.class, B.class}

3、完整的@EnableJpaRepositories注解

 1 @EnableJpaRepositories(
 2     basePackages = {},
 3     basePackageClasses = {},
 4     includeFilters = {},
 5     excludeFilters = {},
 6     repositoryImplementationPostfix = "Impl",
 7     namedQueriesLocation = "",//META-INF/jpa-named-queries.properties
 8     queryLookupStrategy=QueryLookupStrategy.Key.CREATE_IF_NOT_FOUND, //QueryLookupStrategy.Key.x
 9     repositoryFactoryBeanClass=JpaRepositoryFactoryBean.class, //class
10     entityManagerFactoryRef="entityManagerFactory",
11     transactionManagerRef="transactionManager",
12     considerNestedRepositories=false, 
13     enableDefaultTransactions=true
14 )

下面分別解釋各個配置項的作用

1)basePackage

用於配置掃描Repositories所在的package及子package。簡單配置中的配置則等同於此項配置值,basePackages可以配置為單個字符串,也可以配置為字符串數組形式。

1 @EnableJpaRepositories(
2         basePackages = "com.cshtong")

多個包路徑

1 @EnableJpaRepositories(
2         basePackages = {"com.cshtong.sample.repository", "com.cshtong.tower.repository"})

 

2)basePackageClasses

指定 Repository 類

1 @EnableJpaRepositories(basePackageClasses = BookRepository.class)
1 @EnableJpaRepositories(
2         basePackageClasses = {ShopRepository.class, OrganizationRepository.class})

備注:測試的時候發現,配置包類的一個Repositories類,該包內其他Repositores也會被加載

3)includeFilters

過濾器,該過濾區采用ComponentScan的過濾器類

1 @EnableJpaRepositories(
2         includeFilters={@ComponentScan.Filter(type=FilterType.ANNOTATION, value=Repository.class)})

 

4)excludeFilters

不包含過濾器

1 @EnableJpaRepositories(
2         excludeFilters={
3                 @ComponentScan.Filter(type=FilterType.ANNOTATION, value=Service.class),
4                 @ComponentScan.Filter(type=FilterType.ANNOTATION, value=Controller.class)})

 

5)repositoryImplementationPostfix

實現類追加的尾部,比如ShopRepository,對應的為ShopRepositoryImpl

6)namedQueriesLocation

named SQL存放的位置,默認為META-INF/jpa-named-queries.properties

7)queryLookupStrategy

構建條件查詢的策略,包含三種方式CREATE,USE_DECLARED_QUERY,CREATE_IF_NOT_FOUND

  • CREATE:按照接口名稱自動構建查詢
  • USE_DECLARED_QUERY:用戶聲明查詢
  • CREATE_IF_NOT_FOUND:先搜索用戶聲明的,不存在則自動構建

該策略針對如下通過接口名稱自動生成查詢的場景

  List<Person> findByEmailAddressAndLastname(EmailAddress emailAddress, String lastname);

  // Enables the distinct flag for the query
  List<Person> findDistinctPeopleByLastnameOrFirstname(String lastname, String firstname);
  List<Person> findPeopleDistinctByLastnameOrFirstname(String lastname, String firstname);

  // Enabling ignoring case for an individual property
  List<Person> findByLastnameIgnoreCase(String lastname);
  // Enabling ignoring case for all suitable properties
  List<Person> findByLastnameAndFirstnameAllIgnoreCase(String lastname, String firstname);

  // Enabling static ORDER BY for a query
  List<Person> findByLastnameOrderByFirstnameAsc(String lastname);
  List<Person> findByLastnameOrderByFirstnameDesc(String lastname)

8)repositoryFactoryBeanClass

指定Repository的工廠類

9)entityManagerFactoryRef

實體管理工廠引用名稱,對應到@Bean注解對應的方法

 1     @Bean
 2     public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
 3         LocalContainerEntityManagerFactoryBean entityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
 4         entityManagerFactoryBean.setDataSource(dataSource());
 5         entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);
 6         entityManagerFactoryBean
 7                 .setPackagesToScan(env.getRequiredProperty(PROPERTY_NAME_ENTITYMANAGER_PACKAGES_TO_SCAN));
 8         entityManagerFactoryBean.setJpaProperties(hibProperties());
 9         return entityManagerFactoryBean;
10     } 

10)transactionManagerRef

事務管理工廠引用名稱,對應到@Bean注解對應的方法

1 2 3 4 5 6 @Bean public JpaTransactionManager transactionManager() {     JpaTransactionManager transactionManager = new JpaTransactionManager();     transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());     return transactionManager; }

Spring Data 的詳細介紹:請點這裡
Spring Data 的下載地址:請點這裡

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