Query creation
Generally the query creation mechanism for JPA works as described in Query methods. Here’s a short example of what a JPA query method translates into:
Example 43. Query creation from method names
public interface UserRepository extends Repository<User, Long> { List<User> findByEmailAddressAndLastname(String emailAddress, String lastname); }
We will create a query using the JPA criteria API from this but essentially this translates into the following query:select u from User u where u.emailAddress = ?1 and u.lastname = ?2. Spring Data JPA will do a property check and traverse nested properties as described in Property expressions. Here’s an overview of the keywords supported for JPA and what a method containing that keyword essentially translates to.
Table 4. 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<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)
|
转载至：https://www.cnblogs.com/wangdaijun/p/5523923.html
