localhost9000/DishDaoImplwcy.java

package dao.impl;

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

import dao.DishDAOwcy;
import domain.Dishwcy;

public class DishDaoImplwcy implements DishDAOwcy {

	@Override
	public ArrayList<Dishwcy> findAll() {
		String sql ="select *from dish";
		ArrayList<Dishwcy> dishs=new ArrayList<Dishwcy>();
		try {
			
			Connection conn=JDBCUtil.getConnection();
			
			PreparedStatement pstm =conn.prepareStatement(sql);
			ResultSet rs=pstm.executeQuery(sql);
			while(rs.next()) {
				Dishwcy pr=new Dishwcy();
				pr.setDishid(rs.getString("dishid"));
				pr.setCategory(rs.getString("category"));
				pr.setCname(rs.getString("cname"));
				pr.setImage(rs.getString("image"));
				pr.setDescn(rs.getString("descn"));
				pr.setUnitcost(rs.getDouble("unitcost"));
				dishs.add(pr);
			}
		} catch (Exception e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
		// TODO 自动生成的方法存根
		return dishs;
	}

	@Override
	public Dishwcy findById(String dishid) {
		Connection conn=null;
		PreparedStatement pstm =null;
		ResultSet rs=null;
		try {
			
			conn=JDBCUtil.getConnection();
			String sql="select * from dish where dishid=?";
			pstm = conn.prepareStatement(sql);
			pstm.setString(1, dishid);
			rs=pstm.executeQuery();
			if(rs.next()) {
				Dishwcy pr=new Dishwcy();
				pr.setDishid(rs.getString("dishid"));
				pr.setCategory(rs.getString("category"));
				pr.setCname(rs.getString("cname"));
				pr.setImage(rs.getString("image"));
				pr.setDescn(rs.getString("descn"));
				pr.setUnitcost(rs.getDouble("unitcost"));
				return pr;
			}
		} catch (Exception e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}finally {
			if(rs!=null) {
				try {
					rs.close();
				} catch (SQLException e) {
				}
		}
		if(pstm!=null) {
			try {
				rs.close();
			} catch (SQLException e) {
			}
	}
		if(pstm!=null) {
			try {
				rs.close();
			} catch (SQLException e) {
			}
	}
}
		return null;
	}

	@Override
	public ArrayList<Dishwcy> findByCategory(String category) {
		Connection conn =null;
		PreparedStatement pstm =null;
		ResultSet rs=null;
		ArrayList<Dishwcy> dishs=new ArrayList<Dishwcy>();
		
		try {
			conn=JDBCUtil.getConnection();
			String sql="select * from dish where category=?";
			pstm = conn.prepareStatement(sql);
			pstm.setString(1, category);
			rs=pstm.executeQuery();
			while(rs.next()) {
				Dishwcy pr=new Dishwcy();
				pr.setDishid(rs.getString("dishid"));
				pr.setCategory(rs.getString("category"));
				pr.setCname(rs.getString("cname"));
				pr.setImage(rs.getString("image"));
				pr.setDescn(rs.getString("descn"));;
				pr.setUnitcost(rs.getDouble("unitcost"));
				dishs.add(pr);
			}
			rs.close();
			pstm.close();
			conn.close();
		} catch (Exception e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}finally {
			if(rs!=null) {
				try {
					rs.close();
				} catch (SQLException e) {
				}
		}
		if(pstm!=null) {
			try {
				rs.close();
			} catch (SQLException e) {
			}
	}
		if(pstm!=null) {
			try {
				rs.close();
			} catch (SQLException e) {
			}
	}
}
		return dishs;
	}

	@Override
	public int modify(Dishwcy dish) {
		String sql="update info ? ?";
		try {
			
			Connection conn=JDBCUtil.getConnection();
			
			PreparedStatement pstm = conn.prepareStatement(sql);
				Dishwcy pr=new Dishwcy();
				pstm.setString(1, pr.getDishid());
				pstm.setString(2, pr.getCategory());
				pstm.setString(3, pr.getCname());
				pstm.setString(4, pr.getImage());
				pstm.setString(5, pr.getDescn());
				pstm.setDouble(6, pr.getUnitcost());
				int affectedRows = pstm.executeUpdate();
				System.out.printf("成功更新%d条数据。\n",affectedRows);
		} catch (Exception e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
		// TODO 自动生成的方法存根
		return 0;
	}

	@Override
	public int delete(Dishwcy dish) {
		String sql="delect from dish where?";
		try {
			
			Connection conn=JDBCUtil.getConnection();
			PreparedStatement pstm = conn.prepareStatement(sql);
			Dishwcy pr=new Dishwcy();
			pstm.setString(1, pr.getDishid());
			pstm.setString(2, pr.getCategory());
			pstm.setString(3, pr.getCname());
			pstm.setString(4, pr.getImage());
			pstm.setString(5, pr.getDescn());
			pstm.setDouble(6, pr.getUnitcost());
			int affectedRows = pstm.executeUpdate();
			System.out.printf("成功删除%d条数据。\n",affectedRows);

		} catch (Exception e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
		// TODO 自动生成的方法存根
		return 0;
	}

	@Override
	public int insert(Dishwcy dish) {
		try {
			
			Connection conn=JDBCUtil.getConnection();
			String sql="insert into dish values(?,?,?,?,?,?)";
			PreparedStatement pstm = conn.prepareStatement(sql);
			
				Dishwcy pr=new Dishwcy();
				pstm.setString(1, pr.getDishid());
				pstm.setString(2, pr.getCategory());
				pstm.setString(3, pr.getCname());
				pstm.setString(4, pr.getImage());
				pstm.setString(5, pr.getDescn());
				pstm.setDouble(6, pr.getUnitcost());
				
				int affectedRows=pstm.executeUpdate();
				System.out.printf("成功插入%d条数据。\n",affectedRows);
				
		} catch (Exception e) {
			return -1;
		}
		return 0;
	}

	
}