Cache query strings in SimpleJpaRepository.

Cache the deleteAll and count query strings as final fields in SimpleJpaRepository.
This avoids repeated String.format operations and reduces unnecessary object creation
on every invocation of deleteAllInBatch() and count(). No functional changes.

Signed-off-by: Giheon Do <[email protected]>
Closes #3920

Author: Dockerel

spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/support/SimpleJpaRepository.java

@@ -103,6 +103,7 @@
  * @author Diego Krupitza
  * @author Seol-JY
  * @author Joshua Chen
+ * @author Dockerel
  */
 @Repository
 @Transactional(readOnly = true)
@@ -120,6 +121,9 @@ public class SimpleJpaRepository<T, ID> implements JpaRepositoryImplementation<T
 	private final EntityManager entityManager;
 	private final PersistenceProvider provider;
 
+	private final String deleteAllQueryString;
+	private final String countQueryString;
+
 	private @Nullable CrudMethodMetadata metadata;
 	private ProjectionFactory projectionFactory;
 	private EscapeCharacter escapeCharacter = EscapeCharacter.DEFAULT;
@@ -139,6 +143,9 @@ public SimpleJpaRepository(JpaEntityInformation<T, ?> entityInformation, EntityM
 		this.entityManager = entityManager;
 		this.provider = PersistenceProvider.fromEntityManager(entityManager);
 		this.projectionFactory = new SpelAwareProxyProjectionFactory();
+
+		this.deleteAllQueryString = getDeleteAllQueryString();
+		this.countQueryString = getCountQueryString();
 	}
 
 	/**
@@ -309,7 +316,7 @@ public void deleteAll() {
 	@Transactional
 	public void deleteAllInBatch() {
 
-		Query query = entityManager.createQuery(getDeleteAllQueryString());
+		Query query = entityManager.createQuery(deleteAllQueryString);
 
 		applyQueryHints(query);
 
@@ -631,7 +638,7 @@ public <S extends T, R> R findBy(Example<S> example, Function<FetchableFluentQue
 	@Override
 	public long count() {
 
-		TypedQuery<Long> query = entityManager.createQuery(getCountQueryString(), Long.class);
+		TypedQuery<Long> query = entityManager.createQuery(countQueryString, Long.class);
 
 		applyQueryHintsForCount(query);