如何使用JDBC程序在数据库中插入时间戳记值？
SQL中的时间戳数据类型与日期（SQL中）相似，都存储日期：月：年：小时：分钟：秒。除了此时间戳之外，它还存储小数秒。
将时间戳插入数据库
PreparedStatement接口提供了一个名为的方法的setTimestamp()标准碱此方法接受两个参数表示在其中需要存储的时间戳和表示从信号出现时间的毫秒数长可变的地方保持器的参数索引的整数变量（时间，即1970年1月1日，格林尼治标准时间00:00:00）。
示例
假设我们在数据库中有一个名为dispatchs的表，具有以下描述-
+------------------+--------------+------+-----+-------------------+ | Field | Type | Null | Key | Default | +------------------+--------------+------+-----+-------------------+ | Product_Name | varchar(100) | YES | | NULL | | Name_Of_Customer | varchar(100) | YES | | NULL | | Time_Of_Dispatch | timestamp | NO | | CURRENT_TIMESTAMP | | Location | varchar(100) | YES | | NULL | +------------------+--------------+------+-----+-------------------+
如您所见，该表包含名为Time_Of_Dispatch的列，该列存储时间戳记值。
我们可以使用PreparedStatement接口的setTimestamp()方法将时间戳存储在其中，并使用ResultSet接口的getTimestamp()方法进行检索。
以下JDBC程序将记录存储到调度表中并检索它们-
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.Timestamp;
public class TimeStampExample {
public static void main(String args[])throws Exception {
//获得连接
String mysqlUrl = "jdbc:mysql://localhost/sampledb";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//将值插入表
String query = "INSERT INTO Dispatches VALUES (?, ?, ?, ?)";
PreparedStatement pstmt = con.prepareStatement(query);
pstmt.setString(1, "KeyBoard");
pstmt.setString(2, "Amith"); pstmt.setTimestamp(3, new Timestamp(1567296000000L));
pstmt.setString(4, "Hyderabad");
pstmt.execute();
pstmt.setString(1, "Earphones");
pstmt.setString(2, "Sumith"); pstmt.setTimestamp(3, new Timestamp(1556668800000L));
pstmt.setString(4, "Vishakhapatnam");
pstmt.execute();
pstmt.setString(1, "Mouse");
pstmt.setString(2, "Sudha"); pstmt.setTimestamp(3, new Timestamp(1551398399000L));
pstmt.setString(4, "Vijayawada");
pstmt.execute();
System.out.println("Records inserted......");
//创建Statement对象
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select * from Dispatches");
//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"));
System.out.println("Time Of Dispatch: "+rs.getTimestamp("Time_Of_Dispatch"));
System.out.println("Location: "+rs.getString("Location"));
System.out.println();
}
}
}输出结果
Connection established...... Records inserted...... Product Name: KeyBoard Name Of The Customer: Amith Time Of Dispatch: 2019-09-01 05:30:00.0 Location: Hyderabad Product Name: Earphones Name Of The Customer: Sumith Time Of Dispatch: 2019-05-01 05:30:00.0 Location: Vishakhapatnam Product Name: Mouse Name Of The Customer: Sudha Time Of Dispatch: 2019-03-01 05:29:59.0 Location: Vijayawada