Java sql.Date valueOf()方法与示例
valueOf()java.sql.Date类的方法接受以JDBC转义格式(yyyy-mm-dd)表示日期的String值，并进行转换
将给定的String值转换为Date对象。
Date date = Date.valueOf("date_string");示例
让我们使用CREATE语句在MySQL数据库中创建一个带有名称调度的表，如下所示：
CREATE TABLE dispatches( ProductName VARCHAR(255), CustomerName VARCHAR(255), DispatchDate date, DeliveryTime time, Price INT, Location VARCHAR(255));
现在，我们将使用INSERT语句在分派表中插入5条记录-
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');
insert into dispatches values('Mouse', 'Puja', DATE('2019-03-01'), TIME('10:59:59'), 3000, 'Vijayawada');
insert into dispatches values('Mobile', 'Vanaja', DATE('2019-03-01'), TIME('10:10:52'), 9000, 'Chennai');
insert into dispatches values('Headset', 'Jalaja', DATE('2019-04-06'), TIME('11:08:59'), 6000, 'Goa');接下来的JDBC程序建立与数据库的连接，并将新记录插入到dispatchs表中。
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Time;
public class Date_valueOf {
public static void main(String args[]) throws SQLException {
//注册驱动程序
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//获得连接
String mysqlUrl = "jdbc:mysql://localhost/mydatabase";
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, "Watch");
pstmt.setString(2, "Rajan");
Date date = Date.valueOf("2019-01-26");
pstmt.setDate(3, date);
pstmt.setTime(4, new Time(1567315800000L));
pstmt.setInt(5, 4000);
pstmt.setString(6, "Chennai");
pstmt.execute();
//检索数据
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select * from dispatches");
while(rs.next()) {
System.out.print("Name: "+rs.getString("ProductName")+", ");
System.out.print("Customer Name: "+rs.getString("CustomerName")+", ");
System.out.print("Dispatch Date: "+rs.getDate("DispatchDate")+", ");
System.out.print("Delivery Time: "+rs.getTime("DeliveryTime")+", ");
System.out.print("Price: "+rs.getInt("Price")+", ");
System.out.print("Location: "+rs.getString("Location"));
System.out.println();
}
}
}在此程序中，我们以String格式获取日期值，并使用valueOf()方法将其转换为java.util.Date对象。
输出结果
Connection established...... Name: Key-Board, Customer Name: Raja, Dispatch Date: 2019-09-01, Delivery Time: 11:00:00, Price: 7000, Location: Hyderabad, Name: Earphones, Customer Name: Roja, Dispatch Date: 2019-05-01, Delivery Time: 11:00:00, Price: 2000, Location: Vishakhapatnam, Name: Mouse, Customer Name: Puja, Dispatch Date: 2019-03-01, Delivery Time: 10:59:59, Price: 3000, Location: Vijayawada, Name: Mobile, Customer Name: Vanaja, Dispatch Date: 2019-03-01, Delivery Time: 10:10:52, Price: 9000, Location: Chennai, Name: Headset, Customer Name: Jalaja, Dispatch Date: 2019-04-06, Delivery Time: 11:08:59, Price: 6000, Location: Goa, Name: Watch, Customer Name: Rajan, Dispatch Date: 2019-01-26, Delivery Time: 11:00:00, Price: 4000, Location: Chennai