写入blob问题

Question

问题：下面“再将Blob/Clob字段更新到数据库 ”那段代码部分是必须的吗？我在网上搜到的代码似乎都没那段！没那段数据似乎插入不了。

PreparedStatement ps = conn.prepareStatement( " insert into PICTURE(image,resume) values(?,?) " );
// 通过oralce.sql.BLOB/CLOB.empty_lob()构造空Blob/Clob对象
ps.setBlob( 1 ,oracle.sql.BLOB.empty_lob());
ps.setClob( 2 ,oracle.sql.CLOB.empty_lob());

ps.excuteUpdate();
ps.close();

// 再次对读出Blob/Clob句柄
ps = conn.prepareStatement( " select image,resume from PICTURE where id=? for update " );
ps.setInt( 1 , 100 );

ResultSet rs = ps.executeQuery();
rs.next();

oracle.sql.BLOB imgBlob = (oracle.sql.BLOB)rs.getBlob( 1 );
oracle.sql.CLOB resClob = (oracle.sql.CLOB)rs.getClob( 2 );

// 将二进制数据写入Blob
FileInputStream inStream = new FileInputStream( " c://image.jpg " );
OutputStream outStream = imgBlob.getBinaryOutputStream();

byte [] buf = new byte [ 10240 ];
int len;
while (len = inStream.read(buf) > 0 ) {
outStream.write(buf, 0 ,len);
}
inStream.close();
outStream.cloese();

// 将字符串写入Clob
resClob.putString( 1 , " this is a clob " );

[color=red]// 再将Blob/Clob字段更新到数据库
[b]ps = conn.prepareStatement( " update PICTURE set image=? and resume=? where id=? " );
ps.setBlob( 1 ,imgBlob);
ps.setClob( 2 ,resClob);
ps.setInt( 3 , 100 );

ps.executeUpdate();
ps.close();[/b][/color]

Answer 1

[quote]// 再将Blob/Clob字段更新到数据库
ps = conn.prepareStatement( " update PICTURE set image=? and resume=? where id=? " );
ps.setBlob( 1 ,imgBlob);
ps.setClob( 2 ,resClob);
ps.setInt( 3 , 100 );

ps.executeUpdate();
ps.close(); [/quote]

Connection最后Commit下;
没上面那段也可以提交的.

另外,如果驱动不是Oracle的默认驱动,用的是其他的驱动,可能写法要发生些变化;