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法律研究如何在Java中使用LocalDateTime类在表中设置本地日期/时间？
Java8的java.time包提供了一个名为LocalDateTime的类，用于获取本地日期和时间的当前值。除了日期和时间值之外，您还可以获取其他日期和时间字段，例如一年中的某一天、一周中的某一天和一年中的某一周。
将本地时间设置为列
要将本地日期和时间值设置为表中的列：
- 获取LocalDateTime对象 - 您可以通过调用静态方法now()来获取LocalDateTime对象，如下所示：
//Getting the LocalDateTime object LocalDateTime localDateTime = LocalDateTime.now();
- 从上面获得的LocalDateTime中获取LocalDate和LocalTime对象，如下所示：
LocalDate localDate = localDateTime.toLocalDate(); LocalTime localTime = localDateTime.toLocalTime()
- 现在，将LocalDate和LocalTime对象分别传递到java.sql.Date和java.sql.Time类的valueOf()方法，如下所示：
java.sql.Date date = java.sql.Date.valueOf(localDate); java.sql.Time time = java.sql.Time.valueOf(localTime);
示例
让我们使用CREATE语句在MySQL数据库中创建一个名为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) );
现在，我们将使用INSERT语句在dispatches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');以下JDBC程序通过传递所需的值将新记录插入到dispatches表中。在这里，我们获取当前本地日期和时间值，并将它们作为表中日期和时间列的值插入。
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.time.LocalDateTime;
public class settingLocatDate {
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://127.0.0.1/mydatabase";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//Getting the LocalDateTime object
LocalDateTime localDateTime = LocalDateTime.now();
System.out.println(localDateTime.toString());
//Converting date and time values from local to SQL
java.sql.Date date = java.sql.Date.valueOf(localDateTime.toLocalDate());
java.sql.Time time = java.sql.Time.valueOf(localDateTime.toLocalTime());
//Creating a Prepared Statement
String query = "INSERT INTO Dispatches VALUES (?, ?, ?, ?, ?, ?)";
PreparedStatement pstmt = con.prepareStatement(query);
pstmt.setString(1, "Watch");
pstmt.setString(2, "Rajan");
pstmt.setDate(3, date);
pstmt.setObject(4, time);
pstmt.setInt(5, 4000);
pstmt.setString(6, "Chennai");
pstmt.execute();
System.out.println("Rows inserted ....");
//Retrieving values
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("select * from dispatches");
while(rs.next()) {
System.out.println("Product Name: "+rs.getString("ProductName"));
System.out.println("Customer Name: "+rs.getString("CustomerName"));
System.out.println("Date Of Dispatch: "+rs.getDate("DispatchDate"));
System.out.println("Delivery Time: "+rs.getTime("DeliveryTime"));
System.out.println("Location: "+rs.getString("Location"));
System.out.println();
}
}
}输出
Connection established...... 2019-05-14T15:48:42.457 Rows inserted .... Product Name: Key-Board Customer Name: Raja Date Of Dispatch: 2019-09-01 Delivery Time: 11:00:00 Location: Hyderabad Product Name: Earphones Customer Name: Roja Date Of Dispatch: 2019-05-01 Delivery Time: 11:00:00 Location: Vishakhapatnam Product Name: Mouse Customer Name: Puja Date Of Dispatch: 2019-03-01 Delivery Time: 10:59:59 Location: Vijayawada Product Name: Mobile Customer Name: Vanaja Date Of Dispatch: 2019-03-01 Delivery Time: 10:10:52 Location: Chennai Product Name: Headset Customer Name: Jalaja Date Of Dispatch: 2019-04-06 Delivery Time: 11:08:59 Location: Goa Product Name: Watch Customer Name: Rajan Date Of Dispatch: 2019-05-14 Delivery Time: 15:48:42 Location: Chennai
更新于：2019年7月30日
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