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我目前面臨一個讓我發瘋的問題。自定義標識生成器
我想創建自己的IdentifierGenerator來管理特定格式的ID。
public class CustomGenerator implements IdentifierGenerator {
private static final String REQUEST = "SELECT CURRVAL('sequence')";
private final String prefixFormat = "PREFIX-%s";
@Override
public Serializable generate(SessionImplementor session, Object object) throws HibernateException {
final String prefix = getPrefix();
Session sessionHibernate = (Session) session;
Query query = sessionHibernate.createSQLQuery(REQUEST);
Object obj = query.uniqueResult();
return null;
}
private String getPrefix() {
final Calendar date = Calendar.getInstance();
DateFormat dateFormat = new SimpleDateFormat("yyyyMM");
return String.format(prefixFormat, dateFormat.format(date.getTime()));
}
}
我的JUnit測試:
@Test
@Transactional
public void addEntity() {
final Entity entity= new Entity();
final long count = this.entityRepository.count();
this.entityRepository.saveAndFlush(rex);
assertEquals(count + 1, this.entityRepository.count());
}
我的實體:
@Entity
@Table(name = "ENTITY")
public class Entity {
@Id
@GenericGenerator(name = "sequence", strategy = "[...]CustomGenerator")
@GeneratedValue(generator = "sequence")
@Column(name = "ENTITY_ID")
private Integer entityId;
[...]
}
我的JUnit測試崩潰 - 堆棧跟蹤:
org.springframework.dao.InvalidDataAccessResourceUsageException: could not prepare statement; SQL [SELECT CURRVAL('sequence_rex_id')]; nested exception is org.hibernate.exception.SQLGrammarException: could not prepare statement
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:238)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:221)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:417)
at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59)
at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
數據庫:HSQLDB(測試)和PostgreSQL (製作)
有沒有人有任何想法?
對不起,我可以做出任何錯誤。英語不是我的母語。
我把測試從HSQLDB移到POSTGRESQL,問題就消失了。 我想這個問題來自HSQLDB(2.3.2)的配置。 –