Oracle数据库中的两种日期类型：date和timestamp

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Date;

import com.lanqiao.util.jdbc.DBUtil;

/**
Oracle数据库中的日期类型：
date:一般仅仅精确到年月日
timestamp:精确到年月日时分秒  毫秒     建议采用

如购物网站中订单的生成日期最好保存成timestamp类型。

create table t_test(d timestamp);
*/
public class Test {
public static void main(String[] args) {
testAdd();
Connection conn = DBUtil.getConnection();
String sql = "select * from t_test";
try {
PreparedStatement ps = conn.prepareStatement(sql);
ResultSet rs = ps.executeQuery();
while(rs.next()){
//Timestamp类是java.util.Date的子类
Timestamp d = rs.getTimestamp(1);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println(sdf.format(d));   //timestamp --> String
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

//向数据库中存储timestamp类型数据
public static void testAdd(){
Timestamp timestamp = new Timestamp(System.currentTimeMillis());
Connection conn = DBUtil.getConnection();
String sql = "insert into t_test values(?)";
try {
PreparedStatement ps = conn.prepareStatement(sql);
ps.setTimestamp(1, timestamp);
ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
}
}
}