求大神赐教，sql的权限问题怎么解决啊？

[WSGGCC]

我写的程序执行到这里时出错了，控制台显示Can't find file: '.\hello\@0024table.frm' (errno: 2 - No such file or directory)，上网查说是权限问题，请问怎么解决？

newName:hll
oldName:hello

conn=DBUtil.getConnection(newName);
for (int i = 0; i < tableList.size(); i++) {
sql = "rename table "+oldName+".$table to "+newName+".$table";
ptmt = conn.prepareStatement(sql);
; ptmt.execute();
}
if(ptmt!=null){ptmt.close();}
if(conn!=null){conn.close();}