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法律学习Java sql.Timestamp 的 valueOf() 方法附示例
java.sql.Timestamp 类的 valueOf() 方法接受一个表示 JDBC 转义格式时间戳的 String 值，并将给定的字符串值转换为时间戳对象。
Timestamp timeStamp = Time.valueOf("timeStamp_string");示例
使用 CREATE 语句如下所示在 MySQL 数据库中创建名为 dispatches_data 的表
CREATE TABLE dispatches_data( ProductName VARCHAR(255), CustomerName VARCHAR(255), DispatchTimeStamp timestamp, Price INT, Location VARCHAR(255));
现在，我们将使用 INSERT 语句在 dispatches_data 表中插入 5 条记录
insert into dispatches_data values('Key-Board', 'Raja', TIMESTAMP('2019-05-04', '15:02:45'), 7000, 'Hyderabad');
insert into dispatches_data values('Earphones', 'Roja', TIMESTAMP('2019-06-26', '14:13:12'), 2000, 'Vishakhapatnam');
insert into dispatches_data values('Mouse', 'Puja', TIMESTAMP('2019-12-07', '07:50:37'), 3000, 'Vijayawada');
insert into dispatches_data values('Mobile', 'Vanaja' , TIMESTAMP ('2018-03-21', '16:00:45'), 9000, 'Chennai');
insert into dispatches_data values('Headset', 'Jalaja' , TIMESTAMP('2018-12-30', '10:49:27'), 6000, 'Goa');以下 JDBC 程序建立与数据库的连接并在 dispatches_data 表中插入新记录。
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;
public class Timestamp_valueOf {
public static void main(String args[]) throws SQLException {
//Registering the Driver
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//Getting the connection
String mysqlUrl = "jdbc:mysql:///mydatabase";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//Inserting values to a table
String query = "INSERT INTO dispatches_data VALUES (?, ?, ?, ?, ?)";
PreparedStatement pstmt = con.prepareStatement(query);
pstmt.setString(1, "Watch");
pstmt.setString(2, "Rajan");
Timestamp timestamp = Timestamp.valueOf("2019-04-21 14:17:02.0");
pstmt.setTimestamp(3, timestamp);
pstmt.setInt(4, 4000);
pstmt.setString(5, "Chennai");
pstmt.execute();
//Retrieving data
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select * from dispatches_data");
while(rs.next()) {
System.out.print("Name: "+rs.getString("ProductName")+", ");
System.out.print("Customer Name: "+rs.getString("CustomerName")+", ");
System.out.print("Dispatch Time Stamp: "+rs.getDate("DispatchTimeStamp")+", ");
System.out.print("Price: "+rs.getInt("Price")+", ");
System.out.print("Location: "+rs.getString("Location"));
System.out.println();
}
}
}在此程序中，我们将时间戳值采用 String 格式，并使用 valueOf() 方法将其转换为 java.util.Time 对象。
输出
Connection established...... Name: Key-Board, Customer Name: Raja, Dispatch Time Stamp: 2019-05-04, Price: 7000, Location: Hyderabad Name: Earphones, Customer Name: Roja, Dispatch Time Stamp: 2019-06-26, Price: 2000, Location: Vishakhapatnam Name: Mouse, Customer Name: Puja, Dispatch Time Stamp: 2019-12-07, Price: 3000, Location: Vijayawada Name: Mobile, Customer Name: Vanaja, Dispatch Time Stamp: 2018-03-21, Price: 9000, Location: Chennai Name: Headset, Customer Name: Jalaja, Dispatch Time Stamp: 2018-12-30, Price: 6000, Location: Goa Name: Watch, Customer Name: Rajan, Dispatch Time Stamp: 2019-04-21, Price: 4000, Location: Chennai
更新于：2019 年 7 月 30 日
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