java对数据库的操作

package com.DateSystem;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.LinkedList;

import java.util.List;

import javax.swing.JOptionPane;

import com.gui.*;

public class Good_data {

	//根据商品名查询

	public List<Goods> findGoods(String sql){

		List<Goods> list=new LinkedList<Goods>();

		Statement stat=null;

		ResultSet rs=null;

		//获取和数据库的连接

		Connection conn=ConnectionDriver.getConnection();

		try {

			//生成Statement对象，封装SQL语句，执行查询

			stat=conn.createStatement();

			rs=stat.executeQuery(sql);

			//处理结果集中数据，读取每一条记录

			while(rs.next()){

				//int  id=rs.getInt(1);

				String  id=rs.getString(1);

				String name=rs.getString(2);

				String address=rs.getString(3);

				double  in_price=rs.getDouble(4);

				double  out_price=rs.getDouble(5);

				int  jinhuo=rs.getInt(6);

				int  chuhuo=rs.getInt(7);

				int  kucun=rs.getInt(8);

				Goods d=new Goods();

				d.setName(name);

				d.setId(id);

				d.setAddress(address);

				d.setIn_price(in_price);

				d.setOut_price(out_price);

				d.setKucun(kucun);

				d.setJinhuo(jinhuo);

				d.setChuhuo(chuhuo);

				list.add(d);			

			}

		} catch (SQLException e) {

			e.printStackTrace();

		}finally{

			JDBcloss.close(rs, stat, conn);

		}

		return list;

	}

	//依靠商品号查询

	public Goods findStudentById(String id){

		System.out.print("goods");

		//创建Data对象

		Goods data=new Goods();

		Statement stat=null;

		ResultSet rs=null;

		Connection conn=ConnectionDriver.getConnection();

		String sql="select  * from result where id='"+id+"'";

		try {

			stat=conn.createStatement();

			//执行查询

			rs=stat.executeQuery(sql);

			//处理结果集

			if(rs.next()){

				//int  id_id=rs.getInt(1);

				String  id_id=rs.getString(1);

				String name=rs.getString(2);

				String address=rs.getString(3);

				double  in_price=rs.getDouble(4);

				double  out_price=rs.getDouble(5);

				int  jinhuo=rs.getInt(6);

				int  chuhuo=rs.getInt(7);

				int  kucun=rs.getInt(8);

				data.setId(id_id);

				data.setName(name);

				data.setAddress(address);

				data.setIn_price(in_price);

				data.setOut_price(out_price);

				data.setKucun(kucun);

				data.setJinhuo(jinhuo);

				data.setChuhuo(chuhuo);

			}

		} catch (SQLException e) {

			e.printStackTrace();

		}

		return data;

	}

   //对商品信息进行增加、修改、删除

	public boolean updateStudent(String sql){

		boolean flag=false;

		Statement stat=null;

		Connection conn=ConnectionDriver.getConnection();

		try {

			//生成Statement对象，向数据库发送sql指令

			stat=conn.createStatement();

			int i=stat.executeUpdate(sql);

			if(i>0){

				flag=true;

			}

		} catch (SQLException e) {

			e.printStackTrace();

		}finally{

			JDBcloss.close(stat, conn);

		}

		return flag;

	}

}
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java对数据库的操作

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