Hibernate 4.1.2.FINAL在createClob()方法引发错误，Blob字段时禁用上下文LOB创建 [英] Hibernate 4.1.2.FINAL Disabling contextual LOB creation as createClob() method threw error , Blob field

问题描述

我想用hibernate/postgresql 9.1.1创建一个BLOB字段

I want to create a BLOB field with hibernate/postgresql 9.1.1

为什么我会在日志中看到此消息:

Why do I see this message in the logs:

INFO  [org.hibernate.engine.jdbc.internal.LobCreatorBuilder] (MSC service thread 1-5)
HHH000424: Disabling contextual LOB creation as createClob() method threw error : 
java.lang.reflect.InvocationTargetException

我知道这不是错误.

Hibernate 4.1文档:

Hibernate 4.1 documentation:

"@Lob indicates that the property should be persisted in a Blob or a Clob depending
on the property type: java.sql.Clob, Character[], char[] and java.lang.String will be
persisted in a Clob. java.sql.Blob, Byte[], byte[] and Serializable type will be persisted in a Blob."

我这样声明我的字段:

@Lob
@Type(type = "org.hibernate.type.MaterializedClobType")
@Basic(fetch=javax.persistence.FetchType.LAZY)
@Column(name = "`ACTA_CERTIFICACION`")
public byte[] getActacertificacion() {
    return actacertificacion;
}
/**
 * @param actacertificacion
 * @uml.property  name="actacertificacion"
 */
public void setActacertificacion(byte[] actacertificacion) {
    this.actacertificacion = actacertificacion;
}

但是在数据库中，它的创建就像一个文本字段:

But in the database its create like a text field:

"ACTA_INCREMENTOSUSTITUCION" text

我该怎么办?，我想创建一个字节字段或类似的内容.

What can I do?, I want to create a byte field or something similar.

推荐答案

由于您在数据库中使用text，因此应该在POJO类中使用CLOB类型.如果要对此进行映射，只需在POJO中添加一个属性，如下所示，

Since the you are using text in database, you should be using CLOB type in the POJO class. If you want to map this, just add a property in your POJO as below,

@Column(name="ACTA_INCREMENTOSUSTITUCION")
@Clob
private Clob tect;

现在，根据您的要求，您可以按照

Now, as per your requirement you can convert this Clob to a byte[] as told here.

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