mysql模糊查找占位符

import java.sql.*;

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

        try (Connection connection = DriverManager.getConnection(url, username, password)) {
            String searchKeyword = "john";
            String sql = "SELECT * FROM users WHERE username LIKE ?";
            try (PreparedStatement pstmt = connection.prepareStatement(sql)) {
                pstmt.setString(1, "%" + searchKeyword + "%");
                try (ResultSet rs = pstmt.executeQuery()) {
                    while (rs.next()) {
                        System.out.println("ID: " + rs.getInt("id") + ", Username: " + rs.getString("username"));
                    }
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}