警告:請參閱下面我自己的回答。除10.2.0.4之外,該問題是由類路徑中存在的舊Oracle驅動程序引起的。問題解決了。留下這個問題的其餘部分爲後人。Hibernate on Oracle:將字符串屬性映射到CLOB列
我一直在抨擊以下。下面是從我的應用程序代碼蒸餾的簡單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; }
}
有一個String屬性和一個CLOB列。當內容很短時(例如「hello world」),它仍然很好。用較長的字符串,我得到以下例外:
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與Oracle JDBC驅動程序10.2.0.4。例外消息表明配料可能存在問題。雖然我可以在這種簡單的情況下禁用批處理,但我需要啓用「真正」POJO。事實上,就目前而言,查詢批處理是我們使用Hibernate的唯一原因。
所以,我的問題是,我怎麼能做出上述工作?
編輯:有趣的觀察:只要它的長度是1333個字符或更短,我的「描述」屬性的值就會保持正常。這樣的奇數!
編輯2:在試圖找到一個解決方案,我修改了getProperty()
註釋如下,這使得無差異:
@Lob
@Type(type="text")
@Column(name = "PIGGY_DESCRIPTION", length = Integer.MAX_VALUE)
public String getDescription() { return description; }
EDIT 3:這裏的DDL爲 「小豬」 :
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)) ;
而這裏的整個堆棧:
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
我給你的建議一試,我們會在幾分鐘內發現。關於批處理,我自己的代碼中沒有任何批處理。這是一個內置的休眠功能。我們在應用中使用了關聯的@BatchSize註釋。如果你看看我的問題中的堆棧跟蹤,你可以看到Hibernate經歷的所有批處理調用。 – 2009-10-29 16:16:16
不,刪除@Lob,只是離開@Column和@Type沒有幫助。爲了隔離的目的,我使用@BatchSize(size = 0)註釋了類本身,即使它不是一個可接受的整體行爲過程。 – 2009-10-29 16:18:37
@BatchSize(size = 0)技巧也沒有幫助。 – 2009-10-29 16:25:37