@Override
public News getById(int id) throws AppException {
News news = null;
// 声明数据库连接对象，预编译对象的结果集对象
Connection conn = null;
PreparedStatement psmt = null;
ResultSet rs = null;
try {
// 创建数据库连接
conn = DBUtil.getConnection();
String sql =
"select id,author,title,createTime,source,click,content "
+ "from t_news where id=? and del=0";
// 设置从参数，进行查询
// 预编译sql，并设置参数
psmt = conn.prepareStatement(sql);
psmt.setInt(1, id); // 设置新闻id
// 执行查询
rs = psmt.executeQuery(); // 执行查询操作
// 提取信息，保存到newsList中
if (rs.next()) {
news = new News(); // 创建一个News实例对象
// 设置news对象的各属性的值
news.setId(rs.getInt("id"));
news.setAuthor(rs.getString("author"));
news.setTitle(rs.getString("title"));
news.setCreateTime(rs.getString("createTime"));
news.setSource(rs.getString("source"));
int click = rs.getInt("click") + 1;
news.setClick(click);
news.setContent(rs.getString("content"));
updateClick(id, click);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// 关闭数据库操作对象，释放资源
DBUtil.closeResultSet(rs);
DBUtil.closePreparedStatement(psmt);
DBUtil.closeConnection(conn);
}
return news;
}
@Override
public boolean add(News news) throws AppException {
Map<String, Object> session = ActionContext.getContext().getSession();
Integer userId = (Integer) session.get("userId");
boolean flag = false;
Connection conn = null;
PreparedStatement psmt = null;
ResultSet rs = null;
String sql =
"insert into t_news"
+ "(title,user_id,newsType_id,source,author,createTime,keywords,content)"
+ "values(?,?,?,?,?,?,?,?)";
// 预编译sql，并指定返回生成的主键
try {
conn = DBUtil.getConnection();
psmt = conn.prepareStatement(sql, PreparedStatement.RETURN_GENERATED_KEYS);
// 设置参数值
psmt.setString(1, news.getTitle());
psmt.setInt(2, userId);
psmt.setInt(3, news.getNewsType_id());
psmt.setString(4, news.getSource());
psmt.setString(5, news.getAuthor());
psmt.setString(6, news.getCreateTime());
psmt.setString(7, news.getKeywords());
psmt.setString(8, news.getContent());
psmt.executeUpdate(); // 执行更新操作
rs = psmt.getGeneratedKeys(); // 得到插入行的主键，结果集中只有一条记录
if (rs.next()) {
news.setId(rs.getInt(1)); // 获取主键的值，并设置到news对象中
flag = true; // 如果受影响行数大于0，操作成功
}
} catch (SQLException e) {
e.printStackTrace();
throw new AppException("com.xiongyu.dao.impl.NewsDaoImpl.add");
} finally {
// 关闭数据库操作对象，释放资源
DBUtil.closeResultSet(rs);
DBUtil.closePreparedStatement(psmt);
DBUtil.closeConnection(conn);
}
return flag;
}
