src/com/dao/TBDao.java

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package com.dao;

import com.db.DBHelper;
import com.bean.TBBean;

import java.util.*;
import java.sql.*;

public class TBDao {
	
	//获取列表
	public List<TBBean> GetList(String strwhere,String strorder){
		String sql="select * from TB,Teacher,Building where TB_TeacherID=Teacher_ID and TB_BuildingID=Building_ID";
		if(!(isInvalid(strwhere)))
		{
			sql+=" and "+strwhere;
		}
		if(!(isInvalid(strorder)))
		{
			sql+=" order by "+strorder;
		}
		Statement stat = null;
		ResultSet rs = null;
		Connection conn = new DBHelper().getConn();
		List<TBBean> list=new ArrayList<TBBean>();
		try{
			stat = conn.createStatement();
			rs = stat.executeQuery(sql);
			while(rs.next()){
				TBBean cnbean=new TBBean();
				cnbean.setTB_ID(rs.getInt("TB_ID"));
				cnbean.setTB_TeacherID(rs.getInt("TB_TeacherID"));
				cnbean.setTB_BuildingID(rs.getInt("TB_BuildingID"));
				cnbean.setTeacher_Name(rs.getString("Teacher_Name"));
				cnbean.setTeacher_Sex(rs.getString("Teacher_Sex"));
				cnbean.setTeacher_Tel(rs.getString("Teacher_Tel"));
				cnbean.setTeacher_Username(rs.getString("Teacher_Username"));
				cnbean.setBuilding_Name(rs.getString("Building_Name"));
				list.add(cnbean);
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if (conn != null)
					conn.close();
				if (stat != null)
					stat.close();
				if (rs != null)
					rs.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		return list;
	}
	
	//获取指定ID的实体Bean
	public TBBean GetBean(int id){
		String sql="select * from TB where TB_ID="+id;