mysql时间对应java

import java.sql.*;
import java.time.LocalDateTime;

public class MySQLDateTimeExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "username";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            String sql = "SELECT datetime_column FROM my_table WHERE id = ?";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.setInt(1, 1); // 假设我们要查询ID为1的记录
            ResultSet rs = pstmt.executeQuery();

            if (rs.next()) {
                Timestamp timestamp = rs.getTimestamp("datetime_column");
                LocalDateTime localDateTime = timestamp.toLocalDateTime();
                System.out.println("LocalDateTime: " + localDateTime);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

import java.sql.*;
import java.time.LocalDateTime;

public class WriteLocalDateTimeToMySQL {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "username";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            String sql = "UPDATE my_table SET datetime_column = ? WHERE id = ?";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            LocalDateTime now = LocalDateTime.now();
            pstmt.setObject(1, now);
            pstmt.setInt(2, 1); // 假设我们要更新ID为1的记录
            int affectedRows = pstmt.executeUpdate();
            System.out.println("Affected rows: " + affectedRows);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

import java.sql.*;
import java.time.OffsetDateTime;
import java.time.ZoneOffset;

// 读取时
OffsetDateTime offsetDateTime = rs.getObject("datetime_column", OffsetDateTime.class);

// 写入时
OffsetDateTime nowWithZone = OffsetDateTime.now(ZoneOffset.UTC);
pstmt.setObject(1, nowWithZone);