用Java编写新的Blob [英] Writing to a new Blob in Java

问题描述

我希望能够创建一个新的Blob对象，然后对其进行写入.最初，我对此的总体计划如下:

I want to be able to create a new Blob object and then write to it. Originally, my general plan for this was as follows:

创建一个新的Blob(为空，因为没有Blob构造函数) 创建一个新的OutputStream并将其设置为blob.setBinaryStream(0) 写入输出流.

Create a new blob (null, because there's no Blob constructor) Create a new OutputStream and set it to blob.setBinaryStream(0) Write to the output stream.

但是，当我尝试执行此代码时，出现NullPointerException.我应该采取其他方法吗?任何帮助，将不胜感激.

However, I get a NullPointerException when I try to execute this code. Is there a different way I should be going about this? Any help would be appreciated.

谢谢！

〜B

推荐答案

java.sql.Blob是接口而不是类，因此不能存在构造函数.但是您可以实例化实现类SerialBlob，该类允许您从字节数组构造blob.

java.sql.Blob is an interface and not a class, thus no constructor can exist. But you can instantiate the implementing class SerialBlob which allows you to construct a blob from a byte array.

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