0
其實我需要在cassandra數據庫中插入xml文件。所以最初我試圖插入圖像作爲blob內容後來我更改代碼插入XML,但我面臨的問題插入和檢索blob內容爲圖像。任何人都可以建議在cassandra數據庫中插入image/xml文件的最佳做法。試圖在cassandra數據庫中將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);
我在將blob內容作爲圖像檢索時遇到問題。任何人都可以請幫助我。
嘗試使用datastax OGM庫DB操作。另外當你說'面臨的問題',請描述究竟是什麼問題,如錯誤,堆棧跟蹤 –
@monish線程「主要」java.lang.NullPointerException異常,獲取空值,同時回收記錄 –