hibernate异常将空值赋给基本类型setter的属性

Question

Hibernate 3.6.9遇到了令人沮丧的问题.MS SQL Server 2008.请注意异常和奇数列索引引用.

HQL查询本身:

Select r from DataStoreReference r join fetch r.container c where r.hash=:hash and r.state=0

堆栈跟踪:

2012-05-16 00:01:22,184 [BackgroundDeletionThread] ERROR org.hibernate.util.JDBCExceptionReporter - The value supplied cannot be converted to BIGINT.  
2012-05-16 00:01:22,186 [BackgroundDeletionThread] ERROR org.hibernate.util.JDBCExceptionReporter - The value supplied cannot be converted to BIGINT.  
2012-05-16 00:01:22,188 [BackgroundDeletionThread] ERROR org.hibernate.util.JDBCExceptionReporter - Invalid column index 14.  
2012-05-16 00:01:22,190 [BackgroundDeletionThread] ERROR org.hibernate.util.JDBCExceptionReporter - The value supplied cannot be converted to BIGINT.  
2012-05-16 00:01:22,193 [BackgroundDeletionThread] ERROR org.hibernate.util.JDBCExceptionReporter - The value supplied cannot be converted to BIGINT.  
2012-05-16 00:01:22,194 [BackgroundDeletionThread] ERROR org.hibernate.util.JDBCExceptionReporter - Invalid column index 14.  
2012-05-16 00:01:22,194 [BackgroundDeletionThread] ERROR com.flipper.utils.ServerErrorHandlerStrategy - reportError: Db :: com.flipper.datastore.workers.BackgroundDeletionThread.executeWork:87 :: EXCEPTION : com.flipper.datastore.exceptions.DBStoreException: Null value was assigned to a property of primitive type setter of com.flipper.datastore.model.DataStoreReference.usage com.flipper.datastore.exceptions.DBStoreException: Null value was assigned to a property of primitive type setter of com.flipper.datastore.model.DataStoreReference.usage  
    at com.flipper.datastore.impl.hib.HibernateDBStore.getAllReferences(HibernateDBStore.java:301)
    at    com.flipper.datastore.workers.BackgroundDeletionThread.processEntry(BackgroundDeletionThread.java:165)
    at com.flipper.datastore.workers.BackgroundDeletionThread.processSet(BackgroundDeletionThread.java:138)
    at com.flipper.datastore.workers.BackgroundDeletionThread.executeWork(BackgroundDeletionThread.java:84)
    at com.flipper.datastore.workers.BackgroundDeletionThread.run(BackgroundDeletionThread.java:60)
Caused by: org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of com.flipper.datastore.model.DataStoreReference.usage
    at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:109)
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:583)
    at org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:229)
    at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3847)
    at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:152)
    at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:982)
    at org.hibernate.loader.Loader.doQuery(Loader.java:857)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
    at org.hibernate.loader.Loader.doList(Loader.java:2542)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2276)
    at org.hibernate.loader.Loader.list(Loader.java:2271)
    at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:459)
    at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:365)
    at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1268)
    at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
    at com.flipper.message.dao.DataStoreDao.getAllReferencesByHash(DataStoreDao.java:136)
    at com.flipper.datastore.impl.hib.HibernateDBStore.getAllReferences(HibernateDBStore.java:298)
    ... 4 more
Caused by: java.lang.IllegalArgumentException
    at sun.reflect.GeneratedMethodAccessor556.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:66)
    ... 21 more

现在,如果以下情况不正确,我会从逻辑(以及谷歌搜索)中理解这一点

a)DataStoreReference的每个实例化后面紧跟一个SystemUsusMillis的setUsage)b)该项在映射中标记为非null(见下文)c)导出的表仅在f_external列中显示空值.使用列具有完全合理的长数.

POJO:

DataStoreReference

private long id;


private String hash;    
private long date;  
private long sze;   
private long usage; 

private int state;  
private String external;
private DataStoreContainer container; 

其次是通用的未修改的getter/setter.

映射文件:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.flippr.datastore.model">
  <class name="DataStoreReference" table="t_dsref">
    <id name="id">
      <column name="ds_reference_id"/>
      <generator class="native"/>
    </id>
    <property name="hash" not-null="true" column="f_hash" lazy="false" index="idx_hash_dsr" type="string" length="128" />
    <property name="state" not-null="true" column="f_state" lazy="false" index="idx_hash_dsr,idx_size_dsr,idx_usage_dsr" type="integer"/>
    <!--  hibernate hates the name size -->
    <property name="sze" not-null="true" column="f_size" lazy="false" index="idx_size_dsr" type="long"/>
    <property name="date" not-null="true" column="f_date" lazy="false" type="long"/>    
    <property name="usage" not-null="true" column="f_usage" lazy="false" index="idx_usage_dsr" type="long"/>
    <property name="external" not-null="false" column="f_ext" lazy="false" type="string" length="160" />

    <many-to-one name="container" class="com.flipper.datastore.model.DataStoreContainer" 
     column="entity_id" foreign-key="fk_ds_container_id_dsr"  not-found="ignore" not-null="true"/>
   </class>
</hibernate-mapping>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.flipper.datastore.model">
  <class name="DataStoreContainer" table="t_dscnt">
    <id name="id">
      <column name="ds_container_id"/>
      <generator class="native"/>
    </id>
    <property name="containerType" column="f_type" index="idx_containerType_dsc" lazy="false" type="integer"/>
    <property name="fileCount" column="f_fc" lazy="false" type="long"/>
    <property name="deletedCount" column="f_dc" lazy="false" type="long"/>
    <property name="path" column="f_path" length="255" lazy="false"  type="string"/>
    <set cascade="save-update,delete,delete-orphan,all-delete-orphan" inverse="true" name="documents">
      <key column="entity_id" />
      <one-to-many class="com.flipper.datastore.model.DataStoreReference"/>
    </set>
  </class>
</hibernate-mapping>

Answer 1

错误消息是明确的:在至少一行中,列f_usage具有空值.此null值不能像long那样放入基本类型,因为基本类型不能表示null.

当数据库中已存在空值时,property子句中的not-null属性无效.not-null属性仅用于dmd生成.但是数据库表t_dsref的f_usage列可能允许空值(desc t_dsref在sql中检查).

解决方案:与Long交换多头:

private Long usage; 

例如,当您使用该值时,您必须处理null条件

if (usage != null) {
  return usage.longValue();
else
  return -1;

(你使用getter和setter来访问hibernate,所以这个codelet不应该在getter中,因为在数据库中,null值在更新后应该继续为null,但是你可以在你使用的第二个getter中执行它在其他地方,或者你为hibernate进行字段访问.)

我的一般建议:如果列在数据库中标记为NOT NULL ,则原始数据类型应仅用于hibernate属性.

Answer 2

当您在某些列中使用基本类型，但在DB中该字段为空时，在Hibernate中会发生此类错误。解决方案：

解决方案一：使用Wrapper类（用于int的Integer ...）解决方案二：定义列的默认值。

Answer 3

事实证明，这是增强型 Hibernate 3.6 MS SQL 方言的一个错误。如果您扩展 SQLServer2005 或 SQLServer2008 方言，则会遇到此问题。使用较旧的 SQLServer 方言（这几乎是 Hibernate 3.3x 附带的），则不需要。可能与引入分页支持有关。叹