Add Hibernate 7 batches 2-6, batch 7, and batch 8: mapping styles, JPA annotations, natural IDs, @Immutable, stored procedures, in-memory test databases, JNDI mocking, proxies, associations, temporal mapping, named queries, HQL, Criteria API, EntityManager bootstrapping, Ehcache 3 L2 cache configuration, HikariCP connection pooling, Hibernate Validator CDI integration, aggregate functions, sorting, pagination, interceptors, and Hibernate Search 8 (Hibernate 7.4.5.Final + Spring Boot 4.1.1 + JDK 25)

2026-09-20 06:06:42 +00:00
commit 8568c0ce6c
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+package com.ankurm.hibernatedemo.datetime;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityManagerFactory;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+/**
+ * Backs ankurm.com post 4876, docs/13-date-and-time-mapping.md chapter "Second-precision / truncation".
+ * Default (H2) profile here; see {@link NanosecondTruncationHsqldbTest} for the HSQLDB variant.
+ */
+@SpringBootTest
+class NanosecondTruncationTest {
+
+    private static final Logger DEMO = LoggerFactory.getLogger("DEMO");
+
+    @Autowired
+    private EntityManagerFactory emf;
+
+    @Test
+    void nanosecondsOnH2() {
+        LocalDateTime withNanos = LocalDateTime.of(2026, 1, 1, 12, 0, 0, 123_456_789);
+        Instant instantWithNanos = Instant.ofEpochSecond(1_800_000_000L, 123_456_789);
+
+        EntityManager em = emf.createEntityManager();
+        em.getTransaction().begin();
+        NanoPrecisionEntity e = new NanoPrecisionEntity();
+        e.setPlainLocalDateTime(withNanos);
+        e.setHighPrecisionLocalDateTime(withNanos);
+        e.setPlainInstant(instantWithNanos);
+        em.persist(e);
+        em.getTransaction().commit();
+        Long id = e.getId();
+        em.close();
+
+        EntityManager em2 = emf.createEntityManager();
+        NanoPrecisionEntity loaded = em2.find(NanoPrecisionEntity.class, id);
+
+        DEMO.info("H2 2.4.240: original LocalDateTime nanos          = {}", withNanos.getNano());
+        DEMO.info("H2 2.4.240: plain column (precision default) nanos = {} (value={})",
+                loaded.getPlainLocalDateTime().getNano(), loaded.getPlainLocalDateTime());
+        DEMO.info("H2 2.4.240: @Column(precision=9) column nanos      = {} (value={})",
+                loaded.getHighPrecisionLocalDateTime().getNano(), loaded.getHighPrecisionLocalDateTime());
+        DEMO.info("H2 2.4.240: original Instant nanos                 = {}", instantWithNanos.getNano());
+        DEMO.info("H2 2.4.240: plain Instant column nanos             = {} (value={})",
+                loaded.getPlainInstant().getNano(), loaded.getPlainInstant());
+        em2.close();
+    }
+}