JDBC简单写法

//Javabean。pojo
package com.dhcode.Bean;

import java.io.Serializable;

public class DOG implements Serializable{
	private int id;
	private String name;
	private int health;
	private int love;
	private String strain;
	
	public DOG() {
		super();
	}
	public DOG(int id,String name,int health,int love,String strain) {
		super();
		this.id = id;
		this.name = name;
		this.health = health;
		this.love = love;
		this.strain = strain;
		
	}
	public DOG(String name, int health , int love, String strain) {
		super();
		this.health = health;
		this.name = name;
		this.love = love;
		this.strain = strain;
		
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getHealth() {
		return health;
	}
	public void setHealth(int health) {
		this.health = health;
	}
	public int getLove() {
		return love;
	}
	public void setLove(int love) {
		this.love = love;
	}
	public String getStrain() {
		return strain;
	}
	public void setStrain(String strain) {
		this.strain = strain;
	}
		
}

//声明
package com.dhcode.SM;

import java.util.List;

import com.dhcode.Bean.DOG;

public interface DogDAO {
	
		public void addDog(DOG dog);
		public int deleteDog(int id);
		public int updateDog(DOG dog);
		public List getAllDog();
		public DOG getDogById(int id);
		public List getDogBycondition(String name,String strain);
}

//实现impl
package com.dhcode.impl;

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 com.dhcode.Bean.DOG;
import com.dhcode.SM.DogDAO;
import com.dhcode.Until.DBUntil;

public class Dogimpl implements DogDAO{
		Connection con=null;
		PreparedStatement pstmt = null;
		ResultSet rs = null;
		@Override
		public void addDog(DOG dog) {
			// TODO Auto-generated method stub
			String sql = "insert into dog values(dog_emp.nextval,?,?,?,?)";
			
			try {
				con = DBUntil.getConnection();
				pstmt = con.prepareStatement(sql);
				pstmt.setString(1, dog.getName());
				pstmt.setInt(2, dog.getHealth());
				pstmt.setInt(3, dog.getLove());
				pstmt.setString(4, dog.getStrain());
				pstmt.executeUpdate();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally {
				DBUntil.closeAll(rs,pstmt,con);
			}
			
		}
		@Override
		public int deleteDog(int id) {
			// TODO Auto-generated method stub
			int num = 0;
			String sql = "delete from dog where id=?";
			try {
				con = DBUntil.getConnection();
				pstmt = con.prepareStatement(sql);
				pstmt.setObject(1, id);
				num = pstmt.executeUpdate();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} finally {
				DBUntil.closeAll(rs, pstmt, con);
			}
			
			return num;
		}
		@Override
		public int updateDog(DOG dog) {
			// TODO Auto-generated method stub
			int num = 0;
			String sql = "update dog set name = ?,health =?,love =?,strain=?,where id=?";
			
			try {
				con = DBUntil.getConnection();
				pstmt = con.prepareStatement(sql);
				pstmt.setString(1, dog.getName());
				pstmt.setInt(2, dog.getHealth());
				pstmt.setInt(3, dog.getLove());
				pstmt.setString(4, dog.getStrain());
				pstmt.setInt(5,dog.getId());
				num = pstmt.executeUpdate();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
			return num;
		}
		@Override
		public List getAllDog() {
			// TODO Auto-generated method stub
			List dogs = new ArrayList();
			String sql = "select * from dog";
			
			try {
				con = DBUntil.getConnection();
				pstmt = con.prepareStatement(sql);
				rs = pstmt.executeQuery();
				while(rs.next()) {
					DOG dog = new DOG(rs.getInt(1),rs.getString(2),rs.getInt(3),rs.getInt(4),rs.getString(5));
					dogs.add(dog);
				}
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally{
				DBUntil.closeAll(rs, pstmt, con);
			}
			
			return dogs;
		}
		@Override
		public DOG getDogById(int id) {
			// TODO Auto-generated method stub
			DOG dog = null;
			String sql = "select * from student where id=?";
			try {
				con = DBUntil.getConnection();
				pstmt = con.prepareStatement(sql);
				pstmt.setInt(1, id);
				rs = pstmt.executeQuery();
				if(rs.next()) {
					dog = new DOG(rs.getInt(1),rs.getString(2),rs.getInt(3),rs.getInt(4),rs.getString(5));
				}
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally {
				DBUntil.closeAll(rs, pstmt, con);
			}
			return dog;
		}
		@Override
		public List getDogBycondition(String name, String strain) {
			// TODO Auto-generated method stub
			List dogs = new ArrayList();
			String sql = "select * from dog where name ? like ? and strain=?";
			try {
				con = DBUntil.getConnection();
				pstmt = con.prepareStatement(sql);
				pstmt.setObject(1, "%"+name+"%");
				pstmt.setObject(2, strain);
				rs = pstmt.executeQuery();
				while(rs.next()) {
					DOG dog = new DOG(rs.getInt(1),rs.getString(2),rs.getInt(3),rs.getInt(4),rs.getString(5));
					dogs.add(dog);
				}
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally {
				DBUntil.closeAll(rs, pstmt, con);
			}
			
			return dogs;
		}
		
}

//DBuntil.java加载连接
package com.dhcode.Until;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUntil {
		public Connection con = null;
		public PreparedStatement pstmt = null;
		public ResultSet rs = null;
		public DBUntil() {
			
		}
		public static Connection getConnection() {
			PropertiesUntils.loadFile("database.properties");
			String url = PropertiesUntils.getPropertyValue("url");
			String username = PropertiesUntils.getPropertyValue("user");
			String passwd = PropertiesUntils.getPropertyValue("password");
			String driver = PropertiesUntils.getPropertyValue("driver");
			
			Connection con = null;
			try {
				Class.forName(driver);
				con = DriverManager.getConnection(url,username,passwd);
			} catch (ClassNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch(SQLException e) {
				e.printStackTrace();
			}
			if(con==null) {
				System.out.println("连接错误！");
			}
			return con;
			
		}
		public static void closeAll(ResultSet rs,PreparedStatement pstmt,
				Connection con) {
			try {
				if(rs!=null)
					rs.close();
				if(pstmt!=null)
					pstmt.close();
				if(con!=null)
					con.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
//		public static void main(String args[]) {
//			
//			try {
//				Connection con = DBUntil.getConnection();
//				PreparedStatement pstmt = con.prepareStatement("Select * from dog");
//				ResultSet rs = pstmt.executeQuery();
//				
//				while (rs.next()) {
//					System.out.println(rs.getInt(1)+"\t");
//					System.out.println(rs.getString(2)+"\t");
//					System.out.println(rs.getInt(3)+"\t");
//					System.out.println(rs.getInt(4)+"\t");
//					System.out.println(rs.getString(5));
//				}
//			} catch (SQLException e) {
//				// TODO Auto-generated catch block
//				e.printStackTrace();
//			}
//		}
}

//外建propertiesUntil
package com.dhcode.Until;

import java.io.IOException;
import java.util.Properties;

public class PropertiesUntils {
		static Properties property = new Properties();
		
		
		
		public static String getPropertyValue(String key) {
			return property.getProperty(key);
		}

		public static boolean loadFile(String fileName) {
			// TODO Auto-generated method stub
			try {
				property.load(PropertiesUntils.class.getClassLoader().getResourceAsStream(fileName));
			}catch(IOException e) {
				e.printStackTrace();
				return false;
			}
			return true;
		}

		
}

//配置文件oracle 
driver=oracle.jdbc.driver.OracleDriver
url=jdbc:oracle:thin:@127.0.0.1:1521:orcl
user=root
password=123456

//配置文件纯Javamysql
driver=com.mysql.jdbc.Driver
//#在和mysql传递数据的过程中，使用unicode编码格式，并且字符集设置为utf-8
url=jdbc:mysql://127.0.0.1:3306/smbms?useUnicode=true&characterEncoding=utf-8
user=root
password=root