Spring Data JPA @EnableJpaRepositories配置详解
@EnableJpaRepositories注解用于Srping JPA的代码配置，用于取代xml形式的配置文件，@EnableJpaRepositories支持的配置形式丰富多用，本篇文章详细讲解。
1、简单配置
@EnableJpaRepositories("com.spr.repository")
简单配置支持多个package，格式如下：
@EnableJpaRepositories({"com.cshtong.sample.repository", "com.cshtong.tower.repository"})
2、单值和多组值配置方式
大部分注解可以都支持单个注解方式和多个注解，多个注解通常采用"{}"符号包含的一组数据。
比如：字符串形式的 "x.y.z" => {"x.y.z","a.b.c"}
类别： A.class => {A.class, B.class}
3、完整的@EnableJpaRepositories注解
@EnableJpaRepositories(
basePackages = {},
basePackageClasses = {},
includeFilters = {},
excludeFilters = {},
repositoryImplementationPostfix = "Impl",
namedQueriesLocation = "", //META-INF/jpa-named-queries.properties
queryLookupStrategy=QueryLookupStrategy.Key.CREATE_IF_NOT_FOUND, //QueryLookupStrategy.Key.x
repositoryFactoryBeanClass=JpaRepositoryFactoryBean.class, //class
entityManagerFactoryRef="entityManagerFactory",
transactionManagerRef="transactionManager",
considerNestedRepositories=false,
enableDefaultTransactions=true
)
下面分别解释各个配置项的作用
1）basePackage
用于配置扫描Repositories所在的package及子package。简单配置中的配置则等同于此项配置值，basePackages可以配置为单个字符串，也可以配置为字符串数组形式。
@EnableJpaRepositories( basePackages = "com.cshtong")
多个包路径
@EnableJpaRepositories(
basePackages = {"com.cshtong.sample.repository", "com.cshtong.tower.repository"}
2）basePackageClasses
指定 Repository 类
@EnableJpaRepositories(basePackageClasses = BookRepository.class)
@EnableJpaRepositories(
basePackageClasses = {ShopRepository.class, OrganizationRepository.class})
备注：测试的时候发现，配置包类的一个Repositories类，该包内其他Repositores也会被加载
3）includeFilters
过滤器，该过滤区采用ComponentScan的过滤器类
@EnableJpaRepositories(
includeFilters={@ComponentScan.Filter(type=FilterType.ANNOTATION,
value=Repository.class)}
4）excludeFilters
不包含过滤器
@EnableJpaRepositories(
excludeFilters={
@ComponentScan.Filter(type=FilterType.ANNOTATION, value=Service.class),
@ComponentScan.Filter(type=FilterType.ANNOTATION, value=Controller.class)})
5）repositoryImplementationPostfix
实现类追加的尾部，比如ShopRepository，对应的为ShopRepositoryImpl
6）namedQueriesLocation
named SQL存放的位置，默认为META-INF/jpa-named-queries.properties
7）queryLookupStrategy
构建条件查询的策略，包含三种方式CREATE，USE_DECLARED_QUERY，CREATE_IF_NOT_FOUND
CREATE：按照接口名称自动构建查询
USE_DECLARED_QUERY：用户声明查询
CREATE_IF_NOT_FOUND：先搜索用户声明的，不存在则自动构建
该策略针对如下通过接口名称自动生成查询的场景
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的工厂类
9)entityManagerFactoryRef
实体管理工厂引用名称，对应到@Bean注解对应的方法
@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean entityManagerFactoryBean =
new LocalContainerEntityManagerFactoryBean();
entityManagerFactoryBean.setDataSource(dataSource());
entityManagerFactoryBean.setPersistenceProviderClass(HibernatePersistenceProvider.class);
entityManagerFactoryBean.setPackagesToScan(
env.getRequiredProperty(PROPERTY_NAME_ENTITYMANAGER_PACKAGES_TO_SCAN));
entityManagerFactoryBean.setJpaProperties(hibProperties());
return entityManagerFactoryBean;
}
10)transactionManagerRef
事务管理工厂引用名称，对应到@Bean注解对应的方法
@Bean
public JpaTransactionManager transactionManager() {
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());
return transactionManager;
}
原文地址： http://www.linuxidc.com/Linux/2015-08/121198.htm