paperdaoimpl.java

出试卷系统（包括前台教师出卷系统

package daoImpl;

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

import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import util.JdbcUtil;

import dao.PaperDAO;
import entity.Paper;
import entity.Question;

public class PaperDAOImpl extends HibernateDaoSupport implements PaperDAO {

	public Paper selectByName(String name) {
		Paper instance = (Paper) getHibernateTemplate()
		.find(
				"from entity.Paper p where p.name =?",
				name).get(0);
		return instance;
	}

	public Paper selectById(Long id) {
		Paper instance = (Paper) getHibernateTemplate()
		.find(
				"from entity.Paper p where p.id =?",
				id).get(0);
		System.out.print("DAOImpl"+instance.getName());
		return instance;
	}
	public Collection<Paper> selectAllPaper() {
		List<Paper> papers = new ArrayList<Paper>();
		Connection con = null;
		PreparedStatement ps = null;
		ResultSet rs = null;
		String sql = "select * from t_paper order by id";
		try {
			con = JdbcUtil.getConnection();
			ps = con.prepareStatement(sql);
			rs = ps.executeQuery();
			while (rs.next()) {
				Paper paper = new Paper();
				paper.setId(rs.getLong(1));
				paper.setName(rs.getString(2));
				papers.add(paper);
			}
		} catch (SQLException e) {
			e.printStackTrace();
			if (con != null) {
				try {
					con.rollback();
				} catch (SQLException e1) {
					e1.printStackTrace();
				}
			}
		} finally {
			JdbcUtil.release(rs, ps, con);
		}
		return papers;
	}
	
	public Paper selectPaperByName(String name) {
		Connection con = null;
		PreparedStatement ps = null;
		ResultSet rs = null;
		Paper paper = new Paper();
		String sql = "select * from t_paper p where p.name=?";
		try {
			con = JdbcUtil.getConnection();
			ps = con.prepareStatement(sql);
			ps.setString(1, name);
			rs = ps.executeQuery();
			while (rs.next()) {
				paper.setId(rs.getLong(1));
				paper.setName(rs.getString(2));
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			JdbcUtil.release(rs, ps, con);
		}
		return paper;
	}	

}