宠物类Dao小练习
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vo层
package com.neusoft.vo;public abstract class Pet { private int id; private String name; private int health; private int love; public Pet() { super(); } public Pet(int id, String name, int health, int love) { super(); this.id = id; this.name = name; this.health = health; this.love = love; } 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; }}package com.neusoft.vo;public class Dog extends Pet{ private String strain; public Dog() { super(); } public Dog(String strain) { super(); this.strain = strain; } public Dog(int id,String name,int health,int love,String strain){ super.setId(id); super.setName(name); super.setHealth(health); super.setLove(love); this.strain = strain; } public String getStrain() { return strain; } public void setStrain(String strain) { this.strain = strain; }}Dao层
BaseDao
package com.neusoft.dao;import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;public class BaseDao { // 提供数据库连接的四要素:驱动(Driver) 数据库的地址:(URL) 登录名(uname) 密码：(pwd) private static final String DRIVER = "oracle.jdbc.driver.OracleDriver"; private static final String URL = "jdbc:oracle:thin:@127.0.0.1:1521:orcl"; private static final String UNAME = "system"; private static final String UPWD = "123456"; // 使用静态块来加载数据库驱动 static { try { Class.forName(DRIVER); } catch (ClassNotFoundException e) { System.out.println("驱动加载异常：" + e.getMessage()); } } private Connection conn = null;// 声明数据库连接对象 protected ResultSet res = null;// 声明数据库操作返回结果集对象 private PreparedStatement pstmt = null;// 声明数据库操作预处理对象 /** * 创建数据库连接对象 */ public void getConn() { try { conn = DriverManager.getConnection(URL, UNAME, UPWD); } catch (SQLException e) { System.out.println("数据库连接失败："+e.getMessage()); } } /** * 释放资源关闭数据库连接 */ protected void closeAll() { if (null != res) { try { res.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (null != pstmt) { try { pstmt.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (null != conn) { try { conn.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } /** * 执行数据库的查询功能 * * @param sql * @param params * @return */ public ResultSet excuteQuery(String sql, Object[] params) { // 连接数据库 this.getConn(); try { // 创建预处理对象 pstmt = conn.prepareStatement(sql); // 预处理条件参数 if (params != null) { for (int i = 0; i < params.length; i++) { pstmt.setObject(i+1, params[i]); } } // 执行数据库的操作返回结果集 res = pstmt.executeQuery(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return res; } /** * 执行数据库的增，删，改操作 * @param sql * @param params * @return */ public int executeUpdate(String sql,Object[] params){ int count = 0; this.getConn(); try { pstmt = conn.prepareStatement(sql); for (int i = 0; i < params.length; i++) { pstmt.setObject(i+1, params[i]); } count = pstmt.executeUpdate(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ this.closeAll(); } return count; }}IDogDao接口
package com.neusoft.dao.dog;import java.util.List;import com.neusoft.vo.Dog;/** * 宠物_狗的操作功能定义 * @author xxf * */public interface IDogDao { /** * 根据编号查询狗狗 * @param id * @return */ public Dog searchById(int id); /** * 查询狗狗信息列表 * @return */ public List<Dog> searchDogList(); /** * 添加狗狗 * @param dog * @return */ public int addDog(Dog dog); /** * 删除狗信息 * @param id * @return */ public int delDog(int id); /** * 修改狗信息 * @param dog * @return */ public int updateDog(Dog dog);}IDogDaoImpl实现类
package com.neusoft.dao.dog.impl;import java.sql.SQLException;import java.util.ArrayList;import java.util.List;import com.neusoft.dao.BaseDao;import com.neusoft.dao.dog.IDogDao;import com.neusoft.vo.Dog;public class DogDaoImpl extends BaseDao implements IDogDao { @Override public int addDog(Dog dog) { // 编写SQL命令 String sql = "INSERT INTO dog values(seq_dogid.nextval,?,?,?,?)"; // 创建条件参数数组 Object[] params = { dog.getName(), dog.getHealth(), dog.getLove(), dog.getStrain() }; // 调用父类的操作功能操作数据库 int count = super.executeUpdate(sql, params); return count; } @Override public int delDog(int id) { String sql = "DELETE FROM dog WHERE dogId=?"; Object[] params = { id }; int count = super.executeUpdate(sql, params); return count; } @Override public Dog searchById(int id) { Dog dog = null; String sql = "SELECT dogid,dogname, doghealth,doglove,dogstrain FROM dog WHERE dogId=?"; Object[] params = { id }; res = super.excuteQuery(sql, params); try { if (res.next()) { dog = new Dog(); dog.setHealth(res.getInt("doghealth")); dog.setId(res.getInt("dogid")); dog.setLove(res.getInt("doglove")); dog.setName(res.getString("dogname")); dog.setStrain(res.getString("dogstrain")); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { this.closeAll(); } return dog; } @Override public List<Dog> searchDogList() { List<Dog> dogList = new ArrayList<Dog>(); Dog dog = null; String sql = "SELECT dogid,dogname, doghealth,doglove,dogstrain FROM dog"; Object[] params = null; res = super.excuteQuery(sql, params); try { while (res.next()) { dog = new Dog(); dog.setHealth(res.getInt("doghealth")); dog.setId(res.getInt("dogid")); dog.setLove(res.getInt("doglove")); dog.setName(res.getString("dogname")); dog.setStrain(res.getString("dogstrain")); dogList.add(dog); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { this.closeAll(); } return dogList; } @Override public int updateDog(Dog dog) { // TODO Auto-generated method stub String sql = "update dog set dogname=?,doghealth=?,doglove=?,dogstrain=? where dogid = ?"; Object[] params = {dog.getName(),dog.getHealth(),dog.getLove(),dog.getStrain()}; int count = super.executeUpdate(sql, params); return count; }}测试类
Test
package com.neusoft.test;import java.util.Iterator;import java.util.List;import com.neusoft.dao.dog.IDogDao;import com.neusoft.dao.dog.impl.DogDaoImpl;import com.neusoft.vo.Dog;public class Test { public static void main(String[] args) { System.out.println("显示狗类列表"); IDogDao d = new DogDaoImpl(); List<Dog> doglist = d.searchDogList(); Iterator<Dog> it = doglist.iterator(); while (it.hasNext()) { Dog dog = it.next(); System.out.println(dog.getId() + "\t" + dog.getName() + "\t" + dog.getHealth() + "\t" + dog.getLove()); } }} 0 0
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