java:jpa:springdatajpa

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--- java:jpa:springdatajpa [2019/01/15 10:59]
kwon37xi [Java 8 과 함께]
+++ java:jpa:springdatajpa [2019/06/04 14:20]
kwon37xi
@@ 줄 122: / 줄 122: @@
   Optional<Customer> findByLastname(String lastname);
 }
+</code>
+===== Exists =====
+  * [[https://www.baeldung.com/spring-data-exists-query|The Exists Query in Spring Data]]
+  * ''existsByXXX'' 형태의 메소드로 가능.
+  * ''Repository.exists(example)'' 가능
+===== Query 인자로 들어온 null 무시하기 =====
+  * [[https://www.baeldung.com/spring-data-jpa-null-parameters|Spring Data JPA and Null Parameters]]
+  * ''? is null or 비교'' 를 붙이면 된다.
+<code sql>
+(? is null or column = ?)
+</code>
+===== Projection =====
+  * [[https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#projections|Spring Data JPA - Reference Documentation]]
+  * [[https://www.baeldung.com/spring-data-jpa-projections|Spring Data JPA Projection]]
+  * interface 기반으로 projection 가능.
+===== @Query에 SpEL 지원 =====
+  * [[https://spring.io/blog/2014/07/15/spel-support-in-spring-data-jpa-query-definitions|SpEL support in Spring Data JPA @Query definitions]]
+<code java>
+@Query("select u from User u where u.age = ?#{[0]}")
+List<User> findUsersByAge(int age);
+@Query("select u from User u where u.firstname = :#{#customer.firstname}")
+List<User> findUsersByCustomersFirstname(@Param("customer") Customer customer);
 </code>
@@ 줄 128: / 줄 156: @@
   * [[http://www.baeldung.com/spring-data-jpa-query|Spring Data JPA @Query | Baeldung]]
   * [[http://www.baeldung.com/spring-data-annotations|Spring Data Annotations | Baeldung]]
+  * [[https://www.baeldung.com/spring-data-query-by-example|Spring Data JPA Query by Example | Baeldung]]
+  * [[https://www.baeldung.com/spring-data-jpa-repository-populators|Spring Data JPA Repository Populators | Baeldung]] : 실행시점 데이터 생성기

java/jpa/springdatajpa.txt · 마지막으로 수정됨: 2024/02/07 14:43 저자 kwon37xi