如何使用JDBC從java.sql.Date獲取LocalDateTime物件?
Java 8的java.time包提供了一個名為LocalDateTime的類,用於獲取本地日期和時間的當前值。除了日期和時間值之外,您還可以獲取其他日期和時間欄位,例如一年中的第幾天、一週中的第幾天和一年中的第幾周。
將java.sql.Date轉換為LocalDateTime
java.sql.TimeStamp類提供了一個名為toLocalDateTime()的方法,此方法將當前時間戳物件轉換為LocalDateTime物件並返回它。
將日期轉換為LocalDateTime物件。
- 使用getTime()方法從Date物件建立一個Timestamp物件,如下所示:
Date date = rs.getDate("DispatchDate");
//Converting Date to Timestamp
Timestamp timestamp = new Timestamp(date.getTime());- 現在,使用toLocalDateTime()方法將Timestamp物件轉換為LocalDateTime物件。
Time time = rs.getTime("DeliveryTime");
//Converting time to Timestamp
Timestamp timestamp = new Timestamp(time.getTime());
//Time stamp to LocalDateTime
timestamp.toLocalDateTime();示例
讓我們使用CREATE語句在MySQL資料庫中建立一個名為dispatches的表,如下所示:
CREATE TABLE dispatches( ProductName VARCHAR(255), CustomerName VARCHAR(255), DispatchDate date, DeliveryTime time, Price INT, Location VARCHAR(255) );
現在,我們將使用INSERT語句在dispatches表中插入兩條記錄:
insert into dispatches values('Key-Board', 'Raja', DATE('2019-09-01'), TIME('11:00:00'), 7000, 'Hyderabad');
insert into dispatches values('Earphones', 'Roja', DATE('2019-05-01'), TIME('11:00:00'), 2000, 'Vishakhapatnam');下面的JDBC程式建立與資料庫的連線,檢索dispatches_data表的內容,並將第一條記錄的Date值(Dispatch_Date列)轉換為LocalDateTime物件,並顯示其內容。
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Timestamp;
public class LocalDateTimeExample {
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......");
//Retrieving values
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select * from dispatches");
rs.next();
//Retrieving the Date from the table
Date date = rs.getDate("DispatchDate");
//Converting Date to Timestamp
Timestamp timestamp = new Timestamp(date.getTime());
System.out.println("LocalDateTime value from date: "+timestamp.toLocalDateTime());
System.out.println("");
System.out.println("Contents of the first record: ");
System.out.println("Product Name: "+rs.getString("ProductName"));
System.out.println("Customer Name: "+rs.getString("CustomerName"));
System.out.println("Dispatch Date: "+rs.getDate("DispatchDate"));
System.out.println("Delivery Time: "+ rs.getTime("DeliveryTime"));
System.out.println("Location: "+rs.getString("Location"));
System.out.println();
}
}輸出
Connection established...... LocalDateTime value from date: 2019-09-01T00:00 Contents of the first record: Product Name: Key-Board Customer Name: Raja Dispatch Date: 2019-09-01 Delivery Time: 11:00:00 Location: Hyderabad
廣告
資料結構
網路
關係資料庫管理系統 (RDBMS)
作業系統
Java
iOS
HTML
CSS
Android
Python
C語言程式設計
C++
C#
MongoDB
MySQL
Javascript
PHP