JDBC学习笔记（四）二进制数据读写

一、插入二进制数据

File f = new File("D:\BaiduNetdiskDownload\JDBC\111.png");
InputStream in = new BufferedInputStream(new FileInputStream(f));
ps.setBinaryStream(1, in, f.length());　　-- ps为PreparedStatement对象
int i = ps.executeUpdate();

二、读取二进制数据

// 获取输入流还有一种方式

// Blob blob = rs.getBlob("big_blob");

// InputStream in = blob.getBinaryStream();

InputStream in = rs.getBinaryStream("big_blob");
File f = new File("D:\BaiduNetdiskDownload\JDBC\111.bak.png");
FileOutputStream out = new FileOutputStream(f);
byte[] buff = new byte[1024];
int len = 0;
while ((len = in.read(buff)) != -1)
{
    out.write(buff, 0, len);
}