JDBC PreparedStatement 的用法

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Date;


public class testMysql {
	public static void main(String[] args){
		testMysqlConnection();
	}
	public static void testMysqlConnection()
	{
	    Connection con = null;// 创建一个数据库连接
	    PreparedStatement pre = null;// 创建预编译语句对象，一般都是用这个而不用Statement
	    ResultSet result = null;// 创建一个结果集对象
	    try
	    {
	        Class.forName("com.mysql.jdbc.Driver");// 加载Oracle驱动程序
	        System.out.println("开始尝试连接数据库！");       
	        String url = "jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8&characterSetResults=utf8";
			String user = "root";// 用户名,系统默认的账户名
			String password = "123456";// 你安装时选设置的密码
	        long startTime = System.currentTimeMillis();
	        con = DriverManager.getConnection(url, user, password);// 获取连接
                con.setAutoCommit(false);          
//	        String maxUpdateTimesql = "select max(TOPIC_UPDATE_TIME) as maxTime from t29e0000_02aa003 "+ "where OPERATETYPE = ?"; 
	       
//	        PreparedStatement ps = con.prepareStatement(maxUpdateTimesql); 
//	        ps.setString(1, "I");
//	        result = ps.executeQuery();
	        //result 初始游标为head，移动next到第一个记录
	        /*   while(result.next()){
        	//Date maxTime = result.getDate("maxTime");
        	 Date maxTime = result.getDate(1);
        	 System.out.println("============maxTime:"+ maxTime.toLocaleString());
        }*/
	        String iSql = "INSERT INTO user(name,age)VALUES(?,?)";
	        PreparedStatement ps =con.prepareStatement(iSql); 
	        ps.setString(1, "jack");
	        ps.setInt(2, 23);
	        ps.execute();
	        ps.setString(1, "mark");
	        ps.setInt(2, 67);
	        ps.execute();
	        String uSql = "UPDATE user SET name = ?,age=? WHERE id=?";
	        ps =  con.prepareStatement(uSql); 
	        ps.setString(1, "donald");
	        ps.setInt(2, 28);
	        ps.setInt(3, 11);
	        ps.executeUpdate();
	     
	        long endTime = System.currentTimeMillis();
	 
	        System.out.println("============time:"+ (endTime-startTime));
	        System.out.println("============hashCode:"+ con.hashCode());
	        if(!con.isClosed()){
	        	 System.out.println("============连接成功！");
	        }
                con.commit();
	    }
	    catch (Exception e)
	    {
                con.rollback();
	    	System.out.println("=============连接失败："+e.getMessage());
	    	e.printStackTrace();
	    }
	    finally
	    {
	        try
	        {
	            // 逐一将上面的几个对象关闭，因为不关闭的话会影响性能、并且占用资源
	            // 注意关闭的顺序，最后使用的最先关闭
	            if (result != null)
	                result.close();
	            if (pre != null)
	                pre.close();
	            if (con != null)
	                con.close();
	            System.out.println("数据库连接已关闭！");
	        }
	        catch (Exception e)
	        {
	            e.printStackTrace();
	        }
	    }
	}
}