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