小编典典

在Oracle上休眠:将String属性映射到CLOB列

hibernate

警告
:请在下面查看我自己的答案。此问题是由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。这个问题的其余部分留给后代。

我一直在反对以下观点。这是从我的应用程序代码中提取的一个简单的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”),它会持续存在。对于更长的字符串,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)

我将Hibernate 3.2.3与Oracle
JDBC驱动程序10.2.0.4结合使用。异常消息指示批处理可能有错误。虽然可以在这种简单情况下禁用批处理,但是我需要为“实际”
POJO启用批处理。实际上,就目前情况而言,查询批处理是我们完全使用Hibernate的唯一原因。

所以,我的问题是,我该如何进行上述工作?

编辑 :有趣的观察:只要长度等于或小于1333个字符,我的“ description”属性的值就会持续存在。如此奇数!

编辑2 :为了找到一种解决方案,我对getProperty()注释进行了如下修改,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 :这是“小猪”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

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2020-06-20

共1个答案

小编典典

傻瓜警报:事实证明,我的类路径上有一个过时的JAR以及9层的Oracle JDBC类。清理完所有内容后,只需使用以下注释即可轻松完成所有工作:

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

责怪胖手指。

2020-06-20