java - 在 Oracle : mapping String property to CLOB column 上 hibernate

Question

警告:请参阅下面我自己的回答。该问题是由除 10.2.0.4 之外的类路径中存在的旧 Oracle 驱动程序引起的。问题解决了。将这个问题的其余部分留给后代。

我一直在反对以下内容。这是从我的应用程序代码中提炼出来的一个简单的 POJO:

@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。当内容很短时(例如“hello world”)，它仍然很好。使用更长的字符串，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)

我正在使用 Hibernate 3.2.3 和 Oracle JDBC 驱动程序 10.2.0.4。异常的消息表明批处理可能有问题。虽然我可以在这个简单的例子中禁用批处理，但我需要为“真正的”POJO 启用它。事实上，就目前的情况而言，查询批处理是我们使用 Hibernate 的唯一原因。

那么，我的问题是，我怎样才能完成上述工作？

编辑:有趣的观察:我的“描述”属性的值只要不超过 1333 个字符就可以保持良好状态。好奇数!

编辑 2:为了找到解决方案，我修改了 getProperty() 注释如下，但没有任何区别:

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

编辑 3:这是“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

Answer 1

白痴警报:事实证明，我的类路径上有一个陈旧的 JAR，其中包含 9 个左右的 Oracle JDBC 类。清理干净后，一切都只需以下注释就可以神奇地工作:

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

都怪胖手指。