如何在JDBC程序中将Date对象转换为Timestamp？
java.sql.Date类的getTime()方法从当前时间戳记（从格林尼治标准时间1970年1月00：00：00.000）以毫秒（长）为单位检索并返回当前时间。
//检索日期
Date date = rs.getDate("Dispatch_Date");java.sql.Timestamp类的构造函数接受一个长变量，该变量代表从纪元时间起以毫秒为单位的时间，并构造Timestamp对象。
//Creating a Timestamp object. Timestamp ts = new Timestamp(date.getTime()));
使用这些，您可以在JDBC中将Date对象转换为TimeStamp对象。
假设我们已经建立了与MySQL数据库的连接，并使用如下语句对象创建了一个名为dispatch_data的表：
假设我们已经建立了与MySQL数据库的连接，并使用如下语句对象创建了一个名为dispatch_data的表：
//创建一个Statement对象
Statement stmt = con.createStatement();
//查询创建表
String create_query = "Create table dispatch_data ("
+ "Product_Name VARCHAR(255), "
+ "Name_Of_Customer VARCHAR(255) , "
+ "Dispatch_Date date, "
+ "Location VARCHAR(255) )";
stmt.execute(create_query);
System.out.println("table created......");我们使用PreparedStatement将表填充为：
//Inserting values to a table
String query = "INSERT INTO dispatch_data VALUES (?, ?, ?, ?)";
PreparedStatement pstmt = con.prepareStatement(query);
pstmt.setString(1, "KeyBoard");
pstmt.setString(2, "Amith");
pstmt.setDate(3, new Date(376401869000L));
pstmt.setString(4, "Hyderabad");
pstmt.execute();
pstmt.setString(1, "Ear phones");
pstmt.setString(2, "Sumith");
pstmt.setDate(3, new Date(356788333000L));
pstmt.setString(4, "Vishakhapatnam");
pstmt.execute();
pstmt.setString(1, "Mouse");
pstmt.setString(2, "Sudha");
pstmt.setDate(3, new Date(594733933000L));
pstmt.setString(4, "Vijayawada");
pstmt.execute();
System.out.println("Records inserted......");以下JDBC程序从ResultSet中检索日期值，然后将其转换为Timestamp对象并打印详细信息。
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.Timestamp;
public class DateToTimeStamp {
public static void main(String args[])throws Exception {
//注册驱动程序
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//获得连接
String mysqlUrl = "jdbc:mysql://localhost/mydatabase";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//创建一个Statement对象
Statement stmt = con.createStatement();
//创建Statement对象
stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select * from dispatch_data");
//检索值
while(rs.next()) {
System.out.println("Product Name: "+rs.getString("Product_Name"));
System.out.println("Name Of The Customer: "+rs.getString("Name_Of_Customer"));
//检索日期
Date date = rs.getDate("Dispatch_Date");
//打印发货时间
System.out.println("Dispatch_Timestamp: "+new Timestamp(date.getTime()));
System.out.println();
}
}
}输出结果
Connection established...... Product Name: KeyBoard Name Of The Customer: Amith Dispatch_Timestamp: 1981-12-05 00:00:00.0 Product Name: Ear phones Name Of The Customer: Sumith Dispatch_Timestamp: 1981-04-22 00:00:00.0 Product Name: Mouse Name Of The Customer: Sudha Dispatch_Timestamp: 1988-11-05 00:00:00.0