package cn.edu.qust.news.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

import cn.edu.qust.news.dao.NewsDao;
import cn.edu.qust.news.domain.News;
import cn.edu.qust.news.utils.JdbcUtil;

public class NewsDao {

	public void addNews(News news) {
		if (news == null)
			throw new IllegalArgumentException();
		Connection conn = null;
		PreparedStatement stmt = null;
		ResultSet rs = null;
		try {
			conn = JdbcUtil.getConnection();
			stmt = conn
					.prepareStatement("insert into t_news(f_title,f_content,f_date,f_type) values(?,?,?,?)");
			stmt.setString(1, news.getTitle());
			stmt.setString(2, news.getContent());
			stmt.setDate(3, new java.sql.Date(news.getDate().getTime()));
			stmt.setString(4, news.getType());
			stmt.executeUpdate();
		} catch (Exception e) {
			throw new RuntimeException(e);
		} finally {
			JdbcUtil.release(rs, stmt, conn);
		}
	}

	public void updateNews(News news) {

		if (news == null)
			throw new IllegalArgumentException();
		Connection conn = null;
		PreparedStatement stmt = null;
		ResultSet rs = null;
		try {
			conn = JdbcUtil.getConnection();
			stmt = conn
					.prepareStatement("update t_news set f_title=?,f_content=?,f_date=?,f_type=? where f_id=?");
			stmt.setString(1, news.getTitle());
			stmt.setString(2, news.getContent());
			stmt.setDate(3, new java.sql.Date(news.getDate().getTime()));
			stmt.setString(4, news.getType());
			stmt.setInt(5, news.getId());
			stmt.executeUpdate();
		} catch (Exception e) {
			throw new RuntimeException(e);
		} finally {
			JdbcUtil.release(rs, stmt, conn);
		}
	}

	
	public void deleteNewsById(Integer newsId) {

		Connection conn = null;
		PreparedStatement stmt = null;
		ResultSet rs = null;
		try {
			conn = JdbcUtil.getConnection();
			stmt = conn.prepareStatement("delete from t_news where f_id=?");
			stmt.setInt(1, newsId);
			stmt.executeUpdate();
		} catch (Exception e) {
			throw new RuntimeException(e);
		} finally {
			JdbcUtil.release(rs, stmt, conn);
		}
	}
	
	
	public List<News> findAll() {
		Connection conn = null;
		PreparedStatement stmt = null;
		ResultSet rs = null;
		List<News> lNews = new ArrayList<News>();
		try {
			conn = JdbcUtil.getConnection();
			stmt = conn
					.prepareStatement("select f_id,f_title,f_content,f_date,f_type from t_news order by f_id DESC");
			rs = stmt.executeQuery();
			while (rs.next()) {
				News news = new News();
				news.setId(rs.getInt("f_id"));
				news.setTitle(rs.getString("f_title"));
				news.setContent(rs.getString("f_content"));
				news.setDate(rs.getDate("f_date"));
				news.setType(rs.getString("f_type"));
				lNews.add(news);
			} 
			return lNews;
		} catch (Exception e) {
			throw new RuntimeException(e);
		} finally {
			JdbcUtil.release(rs, stmt, conn);
		}
		
	}

	
	public News findNewsById(Integer newsId) {
		Connection conn = null;
		PreparedStatement stmt = null;
		ResultSet rs = null;
		try {
			conn = JdbcUtil.getConnection();
			stmt = conn
					.prepareStatement("select f_id,f_title,f_content,f_date,f_type from t_news where f_id=?");
			stmt.setInt(1, newsId);
			rs = stmt.executeQuery();
			if (rs.next()) {
				News news = new News();
				news.setId(rs.getInt("f_id"));
				news.setTitle(rs.getString("f_title"));
				news.setContent(rs.getString("f_content"));
				news.setDate(rs.getDate("f_date"));
				news.setType(rs.getString("f_type"));
				return news;
			} else
				return null;
		} catch (Exception e) {
			throw new RuntimeException(e);
		} finally {
			JdbcUtil.release(rs, stmt, conn);
		}
	}

	
	public List<News> findNewsByType(String type) {
		Connection conn = null;
		PreparedStatement stmt = null;
		ResultSet rs = null;
		List<News> lNews = new ArrayList<News>();
		try {
			conn = JdbcUtil.getConnection();
			stmt = conn
					.prepareStatement("select f_id,f_title,f_content,f_date,f_type from t_news where f_type=? order by f_id DESC");
			stmt.setString(1, type);
			rs = stmt.executeQuery();
			while (rs.next()) {
				News news = new News();
				news.setId(rs.getInt("f_id"));
				news.setTitle(rs.getString("f_title"));
				news.setContent(rs.getString("f_content"));
				news.setDate(rs.getDate("f_date"));
				news.setType(rs.getString("f_type"));
				lNews.add(news);
			}
			return lNews;
		} catch (Exception e) {
			throw new RuntimeException(e);
		} finally {
			JdbcUtil.release(rs, stmt, conn);
		}
	}

	
	public int getTotalRecords() {
		 Connection conn = null;
		PreparedStatement stmt = null;
		ResultSet rs = null;
		try{
			conn = JdbcUtil.getConnection();
			stmt = conn.prepareStatement("select count(*) from t_news");
			rs = stmt.executeQuery();
			if(rs.next()){
				return rs.getInt(1);
			}else
				return 0;
		}catch(Exception e){
			throw new RuntimeException(e);
		}finally{
			JdbcUtil.release(rs, stmt, conn);
		}
	}

	
	public List<News> findPageRecords(int startIndex, int pagesize) {
		Connection conn = null;
		PreparedStatement stmt = null;
		ResultSet rs = null;
		List<News> lNews = new ArrayList<News>();
		try {
			conn = JdbcUtil.getConnection();
			stmt = conn
					.prepareStatement("select f_id,f_title,f_content,f_date,f_type from t_news order by f_id DESC limit ?,?");
			stmt.setInt(1, startIndex);
			stmt.setInt(2, pagesize);
			rs = stmt.executeQuery();
			while (rs.next()) {
				News news = new News();
				news.setId(rs.getInt("f_id"));
				news.setTitle(rs.getString("f_title"));
				news.setContent(rs.getString("f_content"));
				news.setDate(rs.getDate("f_date"));
				news.setType(rs.getString("f_type"));
				lNews.add(news);
			} 
			return lNews;
		} catch (Exception e) {
			throw new RuntimeException(e);
		} finally {
			JdbcUtil.release(rs, stmt, conn);
		}
	}
	
	

}