使用java存储和检索第(2)位mysql中的值

CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255),
    bio TEXT
);

INSERT INTO users (name, bio) VALUES
('Alice', 'Software Engineer'),
('Bob', 'Data Scientist'),
('Charlie', 'Product Manager');

import java.sql.*;

public class MySQLExample {
    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 SUBSTRING(bio, 2, 1) AS second_char FROM users";
            try (Statement stmt = conn.createStatement();
                 ResultSet rs = stmt.executeQuery(sql)) {
                while (rs.next()) {
                    System.out.println("Second character: " + rs.getString("second_char"));
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}