src/com/tjzhic/dao/impl/StuDaoImpl.java

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package com.tjzhic.dao.impl;

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

import com.tjzhic.dao.StuDao;
import com.tjzhic.db.ConnectionFactory;
import com.tjzhic.entity.Stu;

public class StuDaoImpl implements StuDao{

  //添加一个新的学生
  public int add(Stu stu) {
    int rows = 0;
    Connection con = ConnectionFactory.getConnection();
    PreparedStatement pre = null;
    try {
        String sql = "insert into stu(username,password,regip,regtime) values(?,?,?,NOW())";
        pre = con.prepareStatement(sql);
        pre.setString(1, stu.getUsername());
        pre.setString(2, stu.getPassword());
        pre.setString(3, stu.getRegip());
        rows = pre.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    } finally {
        try{
            if (pre!=null)
                pre.close();
            if (con != null)
                con.close();
        }catch (SQLException e) {
            e.printStackTrace();
        }
    }
    return rows;
  }

  //通过用户名查找用户
  public Stu findByUsername(String username) {
    Stu stu = null;
    Connection con = ConnectionFactory.getConnection();
    PreparedStatement pre = null;
    ResultSet rs = null;
    try{
      pre = con.prepareStatement("select username,regip,regtime from stu where username=? limit 1");
      pre.setString(1, username);
      rs = pre.executeQuery();
      while(rs.next()){
          stu=new Stu();
          stu.setUsername(rs.getString(1));
          stu.setRegip(rs.getString(2));
          stu.setRegtime(rs.getString(3));
      }
    }catch (Exception e){
      e.printStackTrace();
    }finally{