Spring Boot JPA进阶篇

上次只简单说明了Spring data jpa（http://www.jianshu.com/p/f80d026e1de1）的基础使用，在实际开发过程中业务复杂、多样性基础的CRUD是无法满足的；本篇目的在上章的基础上深入进解JAP的使用。

多条件查询 AND

public interface UserRepository extends Repository<User, Long> {

  List<User> findByEmailAddressAndLastname(String emailAddress, String lastname);
}

SQL

select u from User u where u.emailAddress = ?1 and u.lastname = ?2

多条件查询 OR

public interface UserRepository extends Repository<User, Long> {

  List<User> findByEmailAddressOrLastname(String emailAddress, String lastname);
}

SQL

select u from User u where u.emailAddress = ?1 or u.lastname = ?2

用例列表

Keyword	Sample	JPQL snippet
And	findByLastnameAndFirstname	… where x.lastname = ?1 and x.firstname = ?2
Or	findByLastnameOrFirstname	… where x.lastname = ?1 or x.firstname = ?2
Is,Equals	findByFirstname,findByFirstnameIs,findByFirstnameEquals	… where x.firstname = 1?
Between	findByStartDateBetween	… where x.startDate between 1? and ?2
LessThan	findByAgeLessThan	… where x.age < ?1
LessThanEqual	findByAgeLessThanEqual	… where x.age <= ?1
GreaterThan	findByAgeGreaterThan	… where x.age > ?1
GreaterThanEqual	findByAgeGreaterThanEqual	… where x.age >= ?1
After	findByStartDateAfter	… where x.startDate > ?1
Before	findByStartDateBefore	… where x.startDate < ?1
IsNull	findByAgeIsNull	… where x.age is null
IsNotNull,NotNull	findByAge(Is)NotNull	… where x.age not null
Like	findByFirstnameLike	… where x.firstname like ?1
NotLike	findByFirstnameNotLike	… where x.firstname not like ?1
StartingWith	findByFirstnameStartingWith	… where x.firstname like ?1 (parameter bound with appended %)
EndingWith	findByFirstnameEndingWith	… where x.firstname like ?1 (parameter bound with prepended %)
Containing	findByFirstnameContaining	… where x.firstname like ?1 (parameter bound wrapped in %)
OrderBy	findByAgeOrderByLastnameDesc	… where x.age = ?1 order by x.lastname desc
Not	findByLastnameNot	… where x.lastname <> ?1
In	findByAgeIn(Collection<Age> ages)	… where x.age in ?1
NotIn	findByAgeNotIn(Collection<Age> age)	… where x.age not in ?1
True	findByActiveTrue()	… where x.active = true
False	findByActiveFalse()	… where x.active = false
IgnoreCase	findByFirstnameIgnoreCase	… where UPPER(x.firstame) = UPPER(?1)

@Query

public interface UserRepository extends JpaRepository<User, Long> {

  @Query("select u from User u where u.emailAddress = ?1")
  User findByEmailAddress(String emailAddress);
}

多条件排序

Sort sort = new Sort(Sort.Direction.DESC, "createdate") .and(new Sort(Sort.Direction.AES, "id"));
Pageable pageable = new PageRequest(1, 10, sort)

QueryHints

public interface UserRepository extends Repository<User, Long> {

  @QueryHints(value = { @QueryHint(name = "name", value = "value")}, 
              forCounting = false)
  Page<User> findByLastname(String lastname, Pageable pageable);
}

　　可以使用的仓库接口有：
　　　　Repository： 　　　　是 Spring Data的一个核心接口，它不提供任何方法，开发者需要在自己定义的接口中声明需要的方法。

　　　　CrudRepository： 　 　　　　　　 继承Repository，提供增删改查方法，可以直接调用。

　　　　PagingAndSortingRepository：    继承CrudRepository，具有分页查询和排序功能

　　　　JpaRepository：                 继承PagingAndSortingRepository，针对JPA技术提供的接口

　　　　JpaSpecificationExecutor：          可以执行原生SQL查询

参考资料：http://docs.spring.io/spring-data/jpa/docs/1.6.1.RELEASE/reference/html/jpa.repositories.html