Sqlserver中的表更新不了

Sqlserver中的表更新不了，我有一个threads表，
里面有回复数，标题什么的再程序中做，更新
不了数据库，在数据库人为的可以更新。
不知道什么原因，跟表之间的关系有关吗？
大侠们，帮帮忙啊？？？

---

感觉程序没错的。

---

public int modifyThreads(Threads threads) {
int num=0;
String sql="update threads set fid=?,author=?,authorid=?,subject=?,dateline=?,lastPost=?,lastPoster=?,views=?,replies=?,displayOrder=?,highLight=?,digest=?,attachment=?,moderated=? where tid="+threads.getTid();
this.openConn();
try {

pstmt=conn.prepareStatement(sql);
pstmt.setInt(1,threads.getFid());
pstmt.setString(2, threads.getAuthor());
pstmt.setInt(3, threads.getAuthorid());
pstmt.setString(4,threads.getSubject());
System.out.println(threads.getSubject());
pstmt.setString(5,threads.getDateline().toString());
pstmt.setString(6,threads.getLastPost().toString());
pstmt.setString(7,threads.getLastPoster());
pstmt.setInt(8,threads.getViews());
pstmt.setInt(9,threads.getReplies());
pstmt.setByte(10,threads.getDisplayOrder());
pstmt.setByte(11,threads.getHighLight());
pstmt.setByte(12,threads.getDigest());
pstmt.setByte(13,threads.getAttachment());
pstmt.setByte(14,threads.getModerated());
num=pstmt.executeUpdate();
} catch (SQLException e) {