问题描述

出于某种原因，我们托管服务器上的 pdo_mysql PHP 扩展无法运行使用 MySQL 视图的查询，并显示此错误消息.

SQLSTATE[HY000]: 一般错误:1615 准备好的语句需要重新准备

(有一个讨论

由于 libmysql 以字符串形式返回数字类型，我使用 mysqlnd 和 nd_pdo_mysql 来获取本机/严格数据，以便数字类型不作为字符串返回.

来自MySQL官网:https://dev.mysql.com/downloads/connector/php-mysqlnd/

用于 PHP mysqlnd 的 MySQL 本地驱动程序是 PHP 脚本语言的 MySQL 客户端库 libmysql 的直接替代品.

For some reason the pdo_mysql PHP extension, on our hosted server, fails to run a query that uses a MySQL view, with this error message.

SQLSTATE[HY000]: General error: 1615 Prepared statement needs to be re-prepared

(There is a discussion on Bug #42041 Prepared-Statement fails when MySQL-Server under load, as well as numerous questions on Stack Overflow.)

For some reason, the query using the view runs just fine, if we switch to using the nd_pdo_mysql extension, which is for the MySQL Native Driver (mysqlnd).

What is the difference between pdo_mysql and nd_pdo_mysql? Why would one be chosen over the other one?

Thanks.

To connect to your MySQL server from PHP, there are two versions of drivers:

1. mysqlnd
2. libmysql

In order to connect to your MySQL server using mysqlnd driver, you use the nd_pdo_mysql extension, as seen in below screenshot.

Since libmysql returns numeric types as strings, I use mysqlnd with nd_pdo_mysql in order to get native/strict data, so that numeric types are NOT returned as Strings.

From the MySQL official website: https://dev.mysql.com/downloads/connector/php-mysqlnd/

The MySQL native driver for PHP mysqlnd is a drop-in replacement for the MySQL Client Library libmysql for the PHP script language.

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