我有一个嵌入式字段，我想将其与传递的参数进行比较，但前提是此参数不为null。 对于常规（非嵌入式）字段，我可以使用以下查询，它将按预期运行：
FROM TestEntity entity where :embedded is null or entity.embedded = :embedded
但是对于嵌入式字段，Hibernate不能正确绑定参数，它绑定的参数比应有的更多。如您在下面的输出中看到的，有三个“？”但是四个绑定。那是一个休眠错误吗？
2019-02-27 13:19:31,497 [DEBUG] org.hibernate.engine.jdbc.spi.SqlStatementLogger.logStatement(SqlStatementLogger.java:92)
/* FROM TestEntity entity where :embedded is null or entity.embedded = :embedded */ select testentity0_.id as id1_0_, testentity0_.emb_first as emb_firs2_0_, testentity0_.emb_second as emb_seco3_0_ from test testentity0_ where ? is null or testentity0_.emb_first=? and testentity0_.emb_second=?
2019-02-27 13:19:31,498 [TRACE] org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:53)
binding parameter [1] as [VARCHAR] - [null]
2019-02-27 13:19:31,499 [TRACE] org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:53)
binding parameter [2] as [VARCHAR] - [null]
2019-02-27 13:19:31,499 [TRACE] org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:53)
binding parameter [3] as [VARCHAR] - [null]
2019-02-27 13:19:31,499 [TRACE] org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:53)
binding parameter [4] as [VARCHAR] - [null]
2019-02-27 13:19:31,499 [WARN ] org.hibernate.engine.jdbc.spi.SqlExceptionHelper.logExceptions(SqlExceptionHelper.java:129)
SQL Error: 90008, SQLState: 90008
2019-02-27 13:19:31,499 [ERROR] org.hibernate.engine.jdbc.spi.SqlExceptionHelper.logExceptions(SqlExceptionHelper.java:131)
Недопустимое значение "4" для параметра "parameterIndex"
Invalid value "4" for parameter "parameterIndex" [90008-194]
Exception in thread "main" javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: could not execute query
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:147)
at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:155)
at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1419)
at org.hibernate.Query.getResultList(Query.java:427)
at Main.select(Main.java:48)
at Main.main(Main.java:20)
Caused by: org.hibernate.exception.GenericJDBCException: could not execute query
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:47)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111)
at org.hibernate.loader.Loader.doList(Loader.java:2618)
at org.hibernate.loader.Loader.doList(Loader.java:2598)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2430)
at org.hibernate.loader.Loader.list(Loader.java:2425)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:502)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:370)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:216)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1481)
at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1441)
at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1410)
... 3 more
Caused by: org.h2.jdbc.JdbcSQLException: Недопустимое значение "4" для параметра "parameterIndex"
Invalid value "4" for parameter "parameterIndex" [90008-194]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:345)
at org.h2.message.DbException.get(DbException.java:179)
at org.h2.message.DbException.getInvalidValueException(DbException.java:228)
at org.h2.jdbc.JdbcPreparedStatement.setParameter(JdbcPreparedStatement.java:1436)
at org.h2.jdbc.JdbcPreparedStatement.setNull(JdbcPreparedStatement.java:316)
at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:61)
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:279)
at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:274)
at org.hibernate.type.ComponentType.nullSafeSet(ComponentType.java:336)
at org.hibernate.param.NamedParameterSpecification.bind(NamedParameterSpecification.java:53)
at org.hibernate.loader.hql.QueryLoader.bindParameterValues(QueryLoader.java:628)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1956)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1909)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1887)
at org.hibernate.loader.Loader.doQuery(Loader.java:932)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:349)
at org.hibernate.loader.Loader.doList(Loader.java:2615)
... 12 more
TestEntity.java
import javax.persistence.*;
@Entity
@Table(name = "test")
public class TestEntity {
@Id
@GeneratedValue(generator = "test_seq")
@SequenceGenerator(name = "test_seq", sequenceName="TEST_SEQ")
@Column(name = "id")
private int id;
@Embedded
private TestEmbedded embedded;
public TestEntity() {
}
public TestEntity(TestEmbedded embedded) {
this.embedded = embedded;
}
public int getId() {
return id;
}
public TestEmbedded getEmbedded() {
return embedded;
}
}
TestEmbedded.java
import javax.persistence.*;
@Embeddable
public class TestEmbedded {
@Column(name = "emb_first", nullable = false)
private String embFirst;
@Column(name = "emb_second", nullable = false)
private String embSecond;
public TestEmbedded() {
}
public TestEmbedded(String embFirst, String embSecond) {
this.embFirst = embFirst;
this.embSecond = embSecond;
}
public String getEmbFirst() {
return embFirst;
}
public String getEmbSecond() {
return embSecond;
}
}
Main.java
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.TypedQuery;
import java.util.List;
import java.util.Properties;
public class Main {
public static void main(String[] args) {
Properties entityManagerFactoryProperties = new Properties();
entityManagerFactoryProperties.setProperty("javax.persistence.jdbc.driver", "org.h2.Driver");
entityManagerFactoryProperties.setProperty("javax.persistence.jdbc.url", "jdbc:h2:mem:");
entityManagerFactoryProperties.setProperty("javax.persistence.jdbc.user", "sa");
entityManagerFactoryProperties.setProperty("javax.persistence.jdbc.password", "");
EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("main", entityManagerFactoryProperties);
insert(entityManagerFactory);
select(entityManagerFactory);
}
private static void insert(EntityManagerFactory entityManagerFactory) {
EntityManager entityManager = entityManagerFactory.createEntityManager();
entityManager.getTransaction().begin();
try {
entityManager.persist(new TestEntity(new TestEmbedded("1", "2")));
entityManager.persist(new TestEntity(new TestEmbedded("3", "2")));
entityManager.getTransaction().commit();
} catch (Exception e) {
entityManager.getTransaction().rollback();
throw e;
} finally {
entityManager.close();
}
}
private static void select(EntityManagerFactory entityManagerFactory) {
EntityManager entityManager = entityManagerFactory.createEntityManager();
String queryText = "FROM TestEntity entity where "
+ " :embedded is null or entity.embedded = :embedded";
entityManager.getTransaction().begin();
try {
TypedQuery<TestEntity> query = entityManager.createQuery(queryText, TestEntity.class);
query.setParameter("embedded", null);
List<TestEntity> result = query.getResultList();
entityManager.getTransaction().commit();
} catch (Exception e) {
entityManager.getTransaction().rollback();
throw e;
} finally {
entityManager.close();
}
}
}
persistence.xml
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
<persistence-unit name="main">
<class>TestEntity</class>
<exclude-unlisted-classes>true</exclude-unlisted-classes>
<properties>
<property name="hibernate.hbm2ddl.auto" value="create-drop"/>
<property name="hibernate.use_sql_comments" value="true"/>
</properties>
</persistence-unit>
</persistence>