java/OrderDetailDaoImpl.java

package flowershop.daoimpl;

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

import flowershop.dao.OrderDetailDao;
import flowershop.model.OrderDetail;

public class OrderDetailDaoImpl implements OrderDetailDao {

	@Override
	public List<OrderDetail> findAll() {
		//通过执行SQL语句查询所有订单详细信息，并将结果封装成OrderDetail对象的列表返回。
				String sql = "select * from account";
				List<OrderDetail> list = new ArrayList<OrderDetail>();
				try(    //2.创建数据库连接
						Connection conn = Jdbc.getConnection();
						//3.创建语句对象
						PreparedStatement pstmt = conn.prepareStatement(sql);
						//4.绑定参数
						//5.执行查询
						ResultSet rs = pstmt.executeQuery(); ){
					//6.遍历结果集
					while(rs.next()) {						
						OrderDetail detail  = new OrderDetail();
						detail.setOrderid(rs.getLong("orderid"));
						detail.setProductid(rs.getString("productid"));
						detail.setQuantity(rs.getInt("quantity"));
						detail.setPrice(rs.getDouble("price"));
						list.add(detail);						
					}					
				}catch (SQLException e) {
					e.printStackTrace();
				}				
				return list;
	}

	
	@Override
	public OrderDetail findByPk(int orderid, String productid) {
		Connection conn = null;
		PreparedStatement pstmt = null;
		ResultSet rs = null;
		String sql = "select orderid,productid,quantity,unitcost from ordersdatail where orderid=? and productid=?";	
		try {
			//2.创建数据库连接
			conn = Jdbc.getConnection();//1.加载驱动程序
			//3.创建语句对象
			pstmt= conn.prepareStatement(sql);
			//4.绑定参数
			pstmt.setInt(1, orderid);
			pstmt.setString(2,productid);
			//5.执行查询
			rs = pstmt.executeQuery();
			//6.遍历按主键查询
			if(rs.next()) {		
				OrderDetail detail = new OrderDetail();
				detail.setOrderid(rs.getLong("orderid"));
				detail.setProductid(rs.getString("productid"));
				detail.setQuantity(rs.getInt("quantity"));
				detail.setPrice(rs.getDouble("price"));
				return detail;
			}
		}catch(SQLException e) {
			e.printStackTrace();
		}finally {
			if (rs !=null) {
				try {
					rs.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}				
			}
			if (pstmt !=null) {
				try {
					pstmt.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}				
			}
			if (conn !=null) {
				try {
					conn.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}				
			}
		}
		return null;
	}

	
	@Override
	public int create(OrderDetail orderDetail) {
		String sql = "insert into orderdetail(orderid,productid,quantity,price) values(?,?,?,?)";
		try (// 2.创建数据库连接
				Connection conn = Jdbc.getConnection();
				// 3.创建语句对象
				PreparedStatement pstmt = conn.prepareStatement(sql);) {
			// 4.绑定参数
			pstmt.setLong(1, orderDetail.getOrderid());
			pstmt.setString(2, orderDetail.getProductid());
			pstmt.setInt(3, orderDetail.getQuantity());
			pstmt.setDouble(4, orderDetail.getPrice());		
			// 5.执行
			int a = pstmt.executeUpdate();
			System.out.printf("成功插入%d数据.\n",a);
		} catch (SQLException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
		return 0;
	}

	
	@Override
	public int modify(OrderDetail orderDetail) {
    String sql = "update ordersdetail set price = ? where orderid = ? and productid = ?";
		try ( // 2.创建数据库连接
				Connection conn = Jdbc.getConnection();
				// 3. 创建语句对象
				PreparedStatement pstmt= conn.prepareStatement(sql)
				) {
				// 4. 绑定参数
				pstmt.setDouble(1, orderDetail.getPrice());
				pstmt.setLong(2, orderDetail.getOrderid());
				pstmt.setString(3, orderDetail.getProductid());
				// 5. 执行修改（C、U、D）
				int affectedRows = pstmt.executeUpdate();
				System.out.printf("成功更新%d条数据。\n", affectedRows);
			} catch (SQLException e) {
				e.printStackTrace();
			}
		return 0;
	}

	
	@Override
	public int remove(OrderDetail orderDetail) {
    String sql = "delete from ordersdetail where orderid = ? and productid = ?";
		try ( // 2.创建数据库连接
				Connection conn = Jdbc.getConnection();
				// 3. 创建语句对象
				PreparedStatement pstmt = conn.prepareStatement(sql)) {
				// 4. 绑定参数
				pstmt.setLong(1, orderDetail.getOrderid());
				pstmt.setString(2, orderDetail.getProductid());
				// 5. 执行修改（C、U、D）
				int affectedRows = pstmt.executeUpdate();
				System.out.printf("成功删除%d条数据。\n", affectedRows);
			} catch (SQLException e) {
				e.printStackTrace();
			}
		return 0;
	}
}