spring data jpa 接口使用

spring data jpa 接口使用

1. 接口继承JpaRepository

public interface CustomerDao extends JpaRepository {}

2. 加Query注解定义方法及返回类型

自定义看得见的sql查询语句,提供的命名方法没有合适的或者比较麻烦的,比如多表查询等

//Jpql语句
@Query(value = " from Customer")
List getAllCustomer();
//分页查询
@Query(value = "from Customer ")
List getAllByPage(Pageable pageable);
//条件查询
@Query(value = "from Customer where custId = ?1 ")
Customer getCustomerById (Long id);
//模糊查询
@Query("from Customer where custAddress like ?1 and custName like ?2")
List getCustomerList (String address, String name);
//更新
@Query("update Customer set custSource = ?1 where custId = ?2")
@Modifying
@Transactional
void updateSource (String source, long id);

3. 按照规定命名创建接口(不用写sql语句,不用写注解)

//id查询
Customer findByCustId (Long id);
//模糊
List findByCustNameLikeAndCustAddressLike(String name,String address);
//分页
Page findByCustAddressLike (String address, Pageable pageable);

接口命名的连接词+entity属性+限制形容词,组成方法名称,然后框架帮我们创建接口的实现方法,只需用@Autowired注入使用即可

Table 3. Supported keywords inside method names

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 ages)	… where x.age in ?1
NotIn	findByAgeNotIn(Collection ages)	… 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)