Author
Stroing a Vector in MySQL
james wilson
Greenhorn
Joined: Nov 17, 2001
Posts: 15
posted Dec 04, 2001 15:46:00
0
To Anybody that can help! I'm trying to store a vector in a mysql database but when i read it back I get a EOFException . I don't even know if i've stored the vector correctly and its a read problem or if i'm not writing the vector correctly! Anywho here's the code To Write;<pre> public void writeDb() { try { Class.forName(dbDriver); Connection myConnection = DriverManager.getConnection(dbId, dbUser, dbPassword); ByteArrayOutputStream bytes = new ByteArrayOutputStream (); ObjectOutputStream out = new ObjectOutputStream (bytes); out.writeObject(newtime); String vectordata = bytes.toString(); Statement myStatement = myConnection.createStatement(); String sqlQuery="UPDATE user SET dbTime = ('"+vectordata+"') WHERE dbUserId = ('"+userid+"')"; myStatement.executeUpdate(sqlQuery); System.out.print("Success"); out.flush(); bytes.close(); } catch (Exception e) { System.out.println("FAILURE " +e); } } To Read; public boolean timeDb() { try { Class.forName(dbDriver); Connection myConnection = DriverManager.getConnection(dbId, dbUser, dbPassword); Statement myStatement = myConnection.createStatement(); String sqlQuery="SELECT dbTime FROM user WHERE dbUserId = '"+userid+"'"; ResultSet myResultSet = myStatement.executeQuery(sqlQuery); if(myResultSet.next()) { String vectdata = myResultSet.getString("dbTime"); byte bytedata[] = vectdata.getBytes(); ByteArrayInputStream inbytes = new ByteArrayInputStream (bytedata); ObjectInputStream in = new ObjectInputStream (inbytes); time = (Vector)in.readObject(); Enumeration e = time.elements(); e.nextElement(); while(e.hasMoreElements()) { String extract = e.nextElement().toString(); StringTokenizer token = new StringTokenizer (extract,"/"); token.nextToken(); newtime = newtime+Integer.parseInt(token.nextToken()); } flag=true; } else flag=false; } catch (Exception e) { System.out.println("FAILURE " +e); } return flag; } </pre> Any help would be greatly appreciated James Wilson [This message has been edited by Marilyn deQueiroz (edited December 05, 2001).]
Pho Tek
Ranch Hand
Joined: Nov 05, 2000
Posts: 757
Does MySQL support BLOBs ?
Regards,
Pho
Marilyn de Queiroz
Sheriff
Joined: Jul 22, 2000
Posts: 9033
Yes, Pho Tek, it does.
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