如何在 JDBC 中將日期值轉換為字串?


java.sql.Date 類的 toString() 方法返回日期物件的轉義格式:yyyy-mm-dd。透過此方法,你可以將日期物件轉換為字串。

Date date = rs.getDate("Dispatch_Date");
date.toString());

假設我們有一個名為 dispatch_data 的表,共有 3 條記錄,如下所示

+--------------+------------------+---------------+----------------+
| Product_Name | Name_Of_Customer | Dispatch_Date | Location       |
+--------------+------------------+---------------+----------------+
| KeyBoard     | Amith            | 1981-12-05    | Hyderabad      |
| Ear phones   | Sumith           | 1981-04-22    | Vishakhapatnam |
| Mouse        | Sudha            | 1988-11-05    | Vijayawada     |
+--------------+------------------+---------------+----------------+


下面的 JDBC 程式將與資料庫建立連線,檢索 dispatch_data 表的內容,然後使用 toString() 方法將日期物件轉換為字串值,最後顯示錶的內容和日期值(已被轉換為字串格式)。

import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class DateToString {
   public static void main(String args[])throws Exception {
      //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......");
      //Creating a Statement object
      Statement stmt = con.createStatement();
      //Creating Statement object
      stmt = con.createStatement();
      ResultSet rs = stmt.executeQuery("select * from dispatch_data");
      //Retrieving values
      while(rs.next()) {
         System.out.println("Product Name: "+rs.getString("Product_Name"));
         System.out.println("Name Of The Customer: "+rs.getString("Name_Of_Customer"));
         //Retrieving the date
         Date date = rs.getDate("Dispatch_Date");
         //Converting Date object to String
         System.out.println("Date: "+date.toString());
         System.out.println();
      }
   }
}

輸出

Connection established......
Product Name: KeyBoard
Name Of The Customer: Amith
Date: 1981-12-05

Product Name: Ear phones
Name Of The Customer: Sumith
Date: 1981-04-22

Product Name: Mouse
Name Of The Customer: Sudha
Date: 1988-11-05


更新於: 2019-07-30

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