java – Hibernate on Oracle：将String属性映射到CLOB列

我一直在冲击下列事情.这是一个简单的POJO从我的应用程序代码中删除：

@Entity
@Table(name = "PIGGIES")
public class Piggy {    
    private Long id;
    private String description;

    public Piggy() {}

    @Id
    @GeneratedValue
    @Column(name = "PIGGY_ID")
    public Long getId() { return id; }
    public void setId(Long id) { this.id = id; }

    @Lob
    @Column(name = "PIGGY_DESCRIPTION")
    public String getDescription() { return description; }
    public void setDescription(String d) { description = d; }
}

有一个String属性和一个CLOB列.当内容很短(例如“你好世界”)时,它仍然很好.使用较长的字符串,我得到以下异常：

java.sql.SQLException: operation not allowed: streams type cannot be used in batching
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
        at oracle.jdbc.driver.OraclePreparedStatement.addBatch(OraclePreparedStatement.java:4236)
        at org.apache.commons.dbcp.DelegatingPreparedStatement.addBatch(DelegatingPreparedStatement.java:172)
        at org.apache.commons.dbcp.DelegatingPreparedStatement.addBatch(DelegatingPreparedStatement.java:172)
        at org.hibernate.jdbc.BatchingBatcher.addToBatch(BatchingBatcher.java:31)
        at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2403)

我使用Hibernate 3.2.3与Oracle JDBC驱动程序10.2.0.4.异常的消息表示批处理可能有故障.虽然我可以在这种简单的情况下禁用批处理,但我需要为“真正的”POJO启用它.实际上,现在看来,查询批处理是我们使用Hibernate的唯一原因.

所以,我的问题是,我该如何做上述工作？

编辑：有趣的观察：只要它的长度为1333个字符,我的“描述”属性的值仍然很好.这么奇怪！

编辑2：为了找到一个解决方案,我修改了getProperty()注释如下,这没有什么区别：

@Lob
@Type(type="text")
@Column(name = "PIGGY_DESCRIPTION",length = Integer.MAX_VALUE)
public String getDescription() { return description; }

编辑3：“PIGGIES”的DDL：

CREATE TABLE "PIGGIES" 
 (  "PIGGY_ID" NUMBER NOT NULL ENABLE,"PIGGY_DESCRIPTION" CLOB,CONSTRAINT "PIGGIES_PK" PRIMARY KEY ("PIGGY_ID")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 
STORAGE(INITIAL 1048576 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "BBDATA"  ENABLE
 ) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
STORAGE(INITIAL 1048576 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
  TABLESPACE "BBDATA" 
LOB ("PIGGY_DESCRIPTION") STORE AS "SYS_LOB0000177753C00002$$"(
TABLESPACE "BBDATA" ENABLE STORAGE IN ROW CHUNK 8192 PCTVERSION 10
NOCACHE 
STORAGE(INITIAL 1048576 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)) ;

这是整个堆栈：

org.hibernate.exception.GenericJDBCException: could not update: [com.bamnetworks.cms.types.Piggy#934]
    at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
    at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2425)
    at org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:2307)
    at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2607)
    at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:92)
    at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:232)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:140)
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
    at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
    at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
Caused by: java.sql.SQLException: operation not allowed: streams type cannot be used in batching
    at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
    at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
    at oracle.jdbc.driver.OraclePreparedStatement.addBatch(OraclePreparedStatement.java:4236)
    at org.apache.commons.dbcp.DelegatingPreparedStatement.addBatch(DelegatingPreparedStatement.java:172)
    at org.apache.commons.dbcp.DelegatingPreparedStatement.addBatch(DelegatingPreparedStatement.java:172)
    at org.hibernate.jdbc.BatchingBatcher.addToBatch(BatchingBatcher.java:31)
    at org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:2403)
    ... 45 more