src/com/tjzhic/dao/impl/MajorDaoImpl.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.MajorDao;
import com.tjzhic.db.ConnectionFactory;
import com.tjzhic.entity.Major;

public class MajorDaoImpl implements MajorDao{

  //添加新的专业记录
  public int add(Major major) {
    int rows = 0;
    Connection con = ConnectionFactory.getConnection();
    PreparedStatement pre = null;
    try {
        String sql = "insert into major(mcode,mname,plannum) values(?,?,?)";
        pre = con.prepareStatement(sql);
        pre.setString(1, major.getMcode());
        pre.setString(2, major.getMname());
        pre.setInt(3, major.getPlannum());
        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;

  }

  //按照专业代码删除专业记录
  public int deleteByMcode(String mcode) {
    int rows = 0;
    Connection con = ConnectionFactory.getConnection();
    PreparedStatement pre = null;
    try {
        String sql = "delete from major where mcode=?";
        pre = con.prepareStatement(sql);
        pre.setString(1, mcode);
        rows = pre.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    } finally {
        try{
            if (pre!=null)
                pre.close();
            if (con != null)
                con.close();