JDBC之Statement与PreparedStatement操作数据库对比

 public static void main(String[] args) throws ClassNotFoundException, SQLException {
        //注册驱动
        Class.forName("com.mysql.jdbc.Driver");
 
        //获取连接
        String url = "jdbc:mysql://localhost:3306/ns_cloud?useSSL=false&useUnicode=true&characterEncoding=utf-8";
        String user = "root";
        String password = "123456";
        Connection connection = DriverManager.getConnection(url, user, password);
 
        //定义sql
        String sql = "SELECT t.*  FROM ns_cloud.ns_client t where id =1 and is_bind=1 limit 2";
 
        //获取执行对象Statement
        Statement statement = connection.createStatement();
 
        //这行sql
        ResultSet resultSet = statement.executeQuery(sql);
 
        //处理结果
        while (resultSet.next()) {
            int id = resultSet.getInt("id");
            String name = resultSet.getString("client_name");
            // 其他列的数据获取
            System.out.println("ID: " + id + ", Name: " + name);
        }
 
        //释放资源
        statement.close();
        connection.close();
 
    }

 public static void main(String[] args) throws ClassNotFoundException, SQLException {
        //注册驱动
        Class.forName("com.mysql.jdbc.Driver");
 
        //获取连接
        String url = "jdbc:mysql://localhost:3306/ns_cloud?useSSL=false&useUnicode=true&characterEncoding=utf-8";
        String user = "root";
        String password = "123456";
        Connection connection = DriverManager.getConnection(url, user, password);
 
        String preId="1";
        String isBand="1";
        //定义sql
        String sql = "SELECT t.*  FROM ns_cloud.ns_client t where id =? and is_bind=? limit 2";
 
        //获取执行对象Statement
        PreparedStatement preparedStatement = connection.prepareStatement(sql);
        preparedStatement.setString(1,"1");
        preparedStatement.setString(2,isBand);
 
        //这行sql
        ResultSet resultSet = preparedStatement.executeQuery();
 
        //处理结果
        while (resultSet.next()) {
            int id = resultSet.getInt("id");
            String name = resultSet.getString("client_name");
            // 其他列的数据获取
            System.out.println("ID: " + id + ", Name: " + name);
        }
 
        //释放资源
        preparedStatement.close();
        connection.close();
 
    }