当"keyword“从Java Repository发送时，如何让PSQL认为它是一个变量

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class PSQLExample {
    public static void main(String[] args) {
        String keyword = "example"; // 替换为实际的关键字

        try {
            // 连接到PSQL数据库
            Connection connection = DriverManager.getConnection("jdbc:postgresql://localhost:5432/mydatabase", "username", "password");

            // 创建预处理语句
            String sql = "SELECT * FROM table_name WHERE column_name = ?";
            PreparedStatement statement = connection.prepareStatement(sql);

            // 设置参数
            statement.setString(1, keyword);

            // 执行查询
            ResultSet resultSet = statement.executeQuery();

            // 处理结果集
            while (resultSet.next()) {
                // 处理每一行数据
                String columnValue = resultSet.getString("column_name");
                System.out.println(columnValue);
            }

            // 关闭连接
            resultSet.close();
            statement.close();
            connection.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}