mysql的汉字编码

import java.sql.*;

public class MySQLExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydb?useUnicode=yes&characterEncoding=UTF-8";
        String user = "root";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            // 插入数据
            String insertSql = "INSERT INTO mytable (id, name) VALUES (?, ?)";
            try (PreparedStatement pstmt = conn.prepareStatement(insertSql)) {
                pstmt.setInt(1, 1);
                pstmt.setString(2, "你好");
                pstmt.executeUpdate();
            }

            // 查询数据
            String selectSql = "SELECT * FROM mytable WHERE id = ?";
            try (PreparedStatement pstmt = conn.prepareStatement(selectSql)) {
                pstmt.setInt(1, 1);
                try (ResultSet rs = pstmt.executeQuery()) {
                    while (rs.next()) {
                        System.out.println("ID: " + rs.getInt("id") + ", Name: " + rs.getString("name"));
                    }
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}