dproducts.java

java sql jsp javabean

package com.gc.dao;

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

import com.gc.action.PagesBean;
import com.gc.action.Products;
import com.gc.impl.IProducts;

public class DProducts implements IProducts{
	
	private PreparedStatement pre = null;
	private Connection con = null;
	private ResultSet rs = null;
	
	public boolean modifyProducts(Products pro) {
		int count = 0;
		try
		{
			dao d = new dao();
			con = d.getCon();
			if(con!=null)
			{
				pre = con.prepareStatement("update Products set PName=?,PPrice=?,SmallCID=?,Inventory=?,PicturePath=?,PStatus=? where PID=?");
				pre.setString(1,pro.getPname());
				pre.setDouble(2,pro.getPprice());
				pre.setInt(3,pro.getSmallcid());
				pre.setInt(4,pro.getAmount());
				pre.setString(5,pro.getPicturepath());
				pre.setString(6,pro.getPstatus());
				pre.setInt(7, pro.getPid());
				count = pre.executeUpdate();
			}
			pre.close();
			con.close();
		}catch(Exception e)
		{
			e.printStackTrace();
		}
		if(count>0)
		{
			return true;
		}else
		{
			return false;
		}
	}

	public List<Products> selectAllProducts() {
		List<Products> list = new ArrayList<Products>();
		try
		{
			dao d = new dao();
			con = d.getCon();
			if(con!=null)
			{
				pre = con.prepareStatement("select * from Products");
				rs = pre.executeQuery();
				while(rs.next())
				{
					Products pro = new Products();
					pro.setPid(rs.getInt(1));
					pro.setPname(rs.getString(2));
					pro.setPprice(rs.getDouble(3));
					pro.setSmallcid(rs.getInt(4));
					pro.setAmount(rs.getInt(5));
					pro.setPstatus(rs.getString(6));
					list.add(pro);
				}
			}
			rs.close();
			pre.close();
			con.close();
		}catch(Exception e)
		{
			e.printStackTrace();
		}
		return list;
	}
	
	public List<Products> GetProductsData(PagesBean pages)
	{
		List<Products> list = new ArrayList<Products>();
		int temp = (pages.getCurrentIndex()-1)*pages.getPageCount();
		String sql = "select top "+pages.getPageCount()+" '商品编号'=PID,'商品名称'=PName,'商品价格'=PPrice,'所属类别'=(select SmallCID from SmallCategory where SmallCID=SCID),'库存'=Inventory,'状态'=PStatus from Products where PID not in(select top "+temp+" PID from Products)";
		
		try
		{
			if(con!=null)
			{
				pre = con.prepareStatement(sql);
				rs = pre.executeQuery();
				while(rs.next())
				{
					Products p = new Products();
					p.setPid(rs.getInt(1));
					p.setPname(rs.getString(2));
					p.setPprice(rs.getDouble(3));
					p.setSmallcid(rs.getInt(4));
					p.setAmount(rs.getInt(5));
					p.setPstatus(rs.getString(6).trim());
					list.add(p);
				}
				
			}
		}catch(Exception e)
		{
			e.printStackTrace();
		}finally
		{
			try {
				rs.close();
				pre.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}	
		}
		return list;
	}
	
	//计算有多少条数据
	public int GetDataCount()
	{
		int count = 0;
		try
		{
			dao d = new dao();
			con = d.getCon();
			pre = con.prepareStatement("select count(PID) from Products");
			rs = pre.executeQuery();
			if(rs.next())
			{
			 	count = rs.getInt(1);
			}
		}catch(Exception e)
		{
			e.printStackTrace();
		}finally
		{
			try {
				rs.close();
				pre.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}	
		}
		return count;
	}
	
	public boolean Delete(int id)
	{
		int count =0;
		try
		{
			pre = con.prepareStatement("delete from Products where PID="+id+"");
			count = pre.executeUpdate();				
			pre.close();
		}catch(Exception e)
		{
			e.printStackTrace();
		}
		if(count>0)
		{
			return true;
		}else
		{
			return false;
		}
	}

	public List<Products> selectProductsByPID(int pid) {
		List<Products> list = new ArrayList<Products>();
		try
		{
			dao d = new dao();
			con = d.getCon();
			if(con!=null)
			{
				pre = con.prepareStatement("select * from Products where PID="+pid+"");
				rs = pre.executeQuery();
				while(rs.next())
				{
					Products pro = new Products();
					pro.setPid(rs.getInt(1));
					pro.setPname(rs.getString(2));
					pro.setPprice(rs.getDouble(3));
					pro.setSmallcid(rs.getInt(4));
					pro.setAmount(rs.getInt(5));
					pro.setPicturepath(rs.getString(6));
					pro.setPstatus(rs.getString(7));
					list.add(pro);
				}
			}
			rs.close();
			pre.close();
			con.close();
		}catch(Exception e)
		{
			e.printStackTrace();
		}
		return list;
	}

	public List<Products> selectProductsByPName(String pname) {
		List<Products> list = new ArrayList<Products>();
		try
		{
			dao d = new dao();
			con = d.getCon();
			if(con!=null)
			{
				pre = con.prepareStatement("select * from Products where PName="+pname+"");
				rs = pre.executeQuery();
				while(rs.next())
				{
					Products pro = new Products();
					pro.setPname(rs.getString(2));
					pro.setPprice(rs.getDouble(3));
					pro.setSmallcid(rs.getInt(4));
					pro.setAmount(rs.getInt(5));
					pro.setPstatus(rs.getString(6));
					list.add(pro);
				}
			}
			rs.close();
			pre.close();
			con.close();
		}catch(Exception e)
		{
			e.printStackTrace();
		}
		return list;
	}

	public List<Products> selectProductsBySCID(int scid) {
		List<Products> list = new ArrayList<Products>();
		try
		{
			dao d = new dao();
			con = d.getCon();
			if(con!=null)
			{
				pre = con.prepareStatement("select * from Products where SmallCID="+scid+"");
				rs = pre.executeQuery();
				while(rs.next())
				{
					Products pro = new Products();
					pro.setPid(rs.getInt(1));
					pro.setPname(rs.getString(2));
					pro.setPprice(rs.getDouble(3));
					pro.setSmallcid(rs.getInt(4));
					pro.setAmount(rs.getInt(5));
					pro.setPstatus(rs.getString(6));
					list.add(pro);
				}
			}
			rs.close();
			pre.close();
			con.close();
		}catch(Exception e)
		{
			e.printStackTrace();
		}
		return list;
	}

	public boolean modifyProductsByPID(int pid,String status) {
		int count =0;
		try
		{
			dao d = new dao();
			con = d.getCon();
			if(con!=null)
			{
				pre = con.prepareStatement("update Products set PStatus='"
						+ status.trim() + "' where PID=" + pid + "");
				count = pre.executeUpdate();
			}
			pre.close();
			con.close();
		}catch(Exception e)
		{
			e.printStackTrace();
		}
		if(count>0)
		{
			return true;
		}else
		{
			return false;
		}
	}
}