mysql+jdbc,訪問(wèn)blob字段問(wèn)題，取出時(shí)候rs.getBlob方法報(bào)錯(cuò)

clc409

我的環(huán)境：winxp＋mysql4.1.0alpha-max-nt+tomcat+poolMan(jdbc)

sql:select photo from product where name = '1111'
rs = stmt.executeQuery( sql );
此時(shí)執(zhí)行rs.getMetaData().getColumnType(1)得到：BLOB。
if (rs.next()){
    [color=red]Blob blob = rss.getBlob( column );此句報(bào)錯(cuò)[/color]   
    ……
}
錯(cuò)誤詳細(xì)：
java.lang.ClassCastException
        at com.codestudio.sql.PoolManResultSet.getBlob(PoolManResultSet.java:414
)
        at com.xibie.pub.GetPicServlet.service(GetPicServlet.java:81)
        at javax.servlet.http.HttpServlet.service(Unknown Source)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Unkn
own Source)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(Unknown Sour