问题描述

servlet，mysql 数据已更新，但数据库里的数据没有更新，请问这个是什么情况？

//update新闻
public void update(News news) throws Exception{
DBConnection dbc = new DBConnection();
sql = ""UPDATE e_news SET title=?content=?type1=?type2=?newstype=?url=?uploadurl=? WHERE id=?"";
try {
pstm = dbc.getConnection().prepareStatement(sql);
pstm.setString(1 news.getTitle());
pstm.setString(2 news.getContent());
pstm.setInt(3 news.getType1());
pstm.setInt(4 news.getType2());
pstm.setInt(5 news.getNewstype());
if (news.getNewstype() != 0) {
news.setUrl(this.subString(news.getContent()));
}
pstm.setString(6 news.getUrl());
pstm.setString(7 news.getUploadurl());
pstm.setInt(8 news.getId());
pstm.executeUpdate();
pstm.close();
} catch (Exception e) {
e.printStackTrace();
}
System.out.println(""+++++++++++++++++++++3""+news.getTitle());
System.out.println(""+++++++++++++++++++++3""+news.getContent());
System.out.println(""+++++++++++++++++++++3""+news.getNewstype());
System.out.println(""+++++++++++++++++++++3""+sql);
}

解决方案

没有提交
public void update(News news) throws Exception{
DBConnection dbc = new DBConnection();
sql = ""UPDATE e_news SET title=?content=?type1=?type2=?newstype=?url=?uploadurl=? WHERE id=?"";
try {
Connnection conn = dbc.getConnection();
pstm = conn.prepareStatement(sql);
pstm.setString(1 news.getTitle());
pstm.setString(2 news.getContent());
pstm.setInt(3 news.getType1());
pstm.setInt(4 news.getType2());
pstm.setInt(5 news.getNewstype());
if (news.getNewstype() != 0) {
news.setUrl(this.subString(news.getContent()));
}
pstm.setString(6 news.getUrl());
pstm.setString(7 news.getUploadurl());
pstm.setInt(8 news.getId());
pstm.executeUpdate();
pstm.close();
conn.commit();
} catch (Exception e) {

conn.rollback();

e.printStackTrace();
}
System.out.println(""+++++++++++++++++++++3""+news.getTitle());
System.out.println(""+++++++++++++++++++++3""+news.getContent());
System.out.println(""+++++++++++++++++++++3""+news.getNewstype());
System.out.println(""+++++++++++++++++++++3""+sql);
}