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其实我需要在cassandra数据库中插入xml文件。所以最初我试图插入图像作为blob内容后来我更改代码插入XML,但我面临的问题插入和检索blob内容为图像。任何人都可以建议在cassandra数据库中插入image/xml文件的最佳做法。试图在cassandra数据库中将blob插入image/xml文件
FileInputStream fis=new FileInputStream("C:/Users/anand.png");
byte[] b= new byte[fis.available()+1];
int length=b.length;
fis.read(b);
System.out.println(length);
ByteBuffer buffer =ByteBuffer.wrap(b);
PreparedStatement ps = session.prepare("insert into usersimage (firstname,lastname,age,email,city,length,image) values(?,?,?,?,?,?,?)");
BoundStatement boundStatement = new BoundStatement(ps);
int age=22;
//System.out.println(buffer);
session.execute(boundStatement.bind("xxx","D",age,"[email protected]","xxx",length,buffer));
//session.execute( boundStatement.bind(buffer, "Andy", length));
PreparedStatement ps1 = session.prepare("select * from usersimage where email =?");
BoundStatement boundStatement1 = new BoundStatement(ps1);
ResultSet rs =session.execute(boundStatement1.bind("[email protected]"));
ByteBuffer bImage=null;
for (Row row : rs) {
bImage = row.getBytes("image") ;
length=row.getInt("length");
}
byte image[]= new byte[length];
image=Bytes.getArray(bImage);
HttpServletResponse response = null;
@SuppressWarnings("null")
OutputStream out = response.getOutputStream();
response.setContentType("image/png");
response.setContentLength(image.length);
out.write(image);
我在将blob内容作为图像检索时遇到问题。任何人都可以请帮助我。
尝试使用datastax OGM库DB操作。另外当你说'面临的问题',请描述究竟是什么问题,如错误,堆栈跟踪 –
@monish线程“主要”java.lang.NullPointerException异常,获取空值,同时回收记录 –