如何用java在mysql中制作current_date函数

import java.sql.*;

public class CurrentDateFunction {

    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;

        try {
            // 连接数据库
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");

            // 创建Statement对象
            stmt = conn.createStatement();

            // 创建current_date函数
            String sql = "CREATE FUNCTION current_date() RETURNS DATE " +
                         "BEGIN " +
                         "    RETURN CURDATE(); " +
                         "END";
            stmt.executeUpdate(sql);

            System.out.println("current_date函数创建成功");

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭连接和Statement对象
            try {
                if (stmt != null) {
                    stmt.close();
                }
                if (conn != null) {
                    conn.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}

import java.sql.*;

public class CurrentDateFunction {

    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;

        try {
            // 连接数据库
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");

            // 创建Statement对象
            stmt = conn.createStatement();

            // 调用current_date函数
            String sql = "SELECT current_date()";
            rs = stmt.executeQuery(sql);

            if (rs.next()) {
                Date currentDate = rs.getDate(1);
                System.out.println("当前日期： " + currentDate);
            }

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭连接、Statement对象和ResultSet对象
            try {
                if (rs != null) {
                    rs.close();
                }
                if (stmt != null) {
                    stmt.close();
                }
                if (conn != null) {
                    conn.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}