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
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