sql更新数据到mysql数据库代码

import java.sql.*;

public class UpdateDataExample {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/db_name";
        String username = "username";
        String password = "password";
        
        try {
            // 连接到数据库
            Connection conn = DriverManager.getConnection(url, username, password);
            
            // 创建SQL更新语句
            String sql = "UPDATE table_name SET column1 = ?, column2 = ? WHERE condition";
            
            // 创建预编译语句对象
            PreparedStatement statement = conn.prepareStatement(sql);
            
            // 设置参数值
            statement.setString(1, "new_value1");
            statement.setString(2, "new_value2");
            
            // 执行更新操作
            int rowsAffected = statement.executeUpdate();
            
            // 输出受影响的行数
            System.out.println("Rows affected: " + rowsAffected);
            
            // 关闭连接和语句对象
            statement.close();
            conn.close();
            
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}