Easiest way to convert a Blob into a byte array

问题

what is the easiest way to convert a Blob into a byte array?I am using MYSQL and i want to convert a Blob datatype into a byte array.

Iam using java programming language:)

回答1:

the mySql blob class has the following function :

blob.getBytes

use it like this:

//(assuming you have a ResultSet named RS)
Blob blob = rs.getBlob("SomeDatabaseField");

int blobLength = (int) blob.length();  
byte[] blobAsBytes = blob.getBytes(1, blobLength);

//release the blob and free up memory. (since JDBC 4.0)
blob.free();

回答2:

The easiest way is this.

byte[] bytes = rs.getBytes("my_field");

来源：https://stackoverflow.com/questions/6662432/easiest-way-to-convert-a-blob-into-a-byte-array