java操作mysql数据库实例(二)
onn);
}
}
}
//domain用户类
package com.syxy.domain;
import java.util.Date;
public class User {
private int id ;
private String name ;
private Date birthday ;
private float money ;
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 Date getBirthday() {
return birthday ;
}
public void setBirthday(Date birthday) {
this .birthday = birthday;
}
public float getMoney() {
return money ;
}
public void setMoney( float money) {
this .money = money;
}
}
//dao工厂类（方便复用）
package com.syxy.dao;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.Properties;
public class DaoFactory {
private static UserDao userDao = null ;
private static DaoFactory instance = new DaoFactory();
private DaoFactory(){
try {
Properties prop = new Properties();
InputStream inStream = new FileInputStream(
new File("src/daoconfig.properties" ));
prop.load(inStream);
String userDaoClass = prop.getProperty("userDaoClass" );
userDao = (UserDao) Class.forName(userDaoClass).newInstance();
} catch (Exception e) {
// TODO: handle exception
}
}
public static DaoFactory getInstance(){
return instance ;
}
public UserDao getUserDao(){
return userDao ;
}
}
//操作
数据库的工具类
package com.syxy.utils;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public final class jdbcUtils {
private static String url = "jdbc：mysql://localhost:3306/jdbc";
private static String user = "root";
private static String password = "lxtalx";
private jdbcUtils(){}
static{
try {
Class.forName("com.mysql.jdbc.Driver");
} catch (ClassNotFoundException e) {
throw new ExceptionInInitializerError(e);
}
}
public static Connection getConnection() throws SQLException{
return DriverManager.getConnection(url, user, password);
}
public static void free(ResultSet rs, Statement st, Connection conn){
try {
if(rs!=null)
rs.close();
} catch (Exception e) {
e.printStackTrace();
}finally{
try {
if(st!=null)
st.close();
} catch (Exception e2) {
e2.printStackTrace();
}finally{
try {
conn.close();
} catch (Exception e3) {
e3.printStackTrace();
}
}
}
}
}