微软为PHP添加SQL Server LocalDb及SQL Server AlwaysOn集群支持
2012年是微软向 PHP 开发人员抛出橄榄枝的第五个年头。从入门级 IDEWeb Matrix 到高端云平台 Windows Azure，微软产品随处可见这门流行语言的身影。此次微软发布的SQL Server PHP 3.0 驱动将注意力集中在了 SQL Server 2012 新特性上。 LocalDB 为小型安装提
2012年是微软向 PHP 开发人员抛出橄榄枝的第五个年头。从入门级 IDE——Web Matrix 到高端云平台 Windows Azure，微软产品随处可见这门流行语言的身影。此次微软发布的“SQL Server PHP 3.0 驱动”将注意力集中在了 SQL Server 2012 新特性上。
LocalDB 为小型安装提供了支持，它是一个轻量级版本的 SQLServer，可以在应用程序试图访问数据库文件时自行启动。由于 PHP 主要是一门服务端语言，因此，LocalDB 对于那些不想在开发机器上安装 SQL Server 完整副本的程序员会比较有吸引力。
另外一个支持的特性是“AlwaysOn”集群。该版本中加入了对 Application Intents 的支持，以允许连接重新路由到只读服务器，并进行多子网故障转移。其中，后者专门为分布在世界各个区域的故障转移服务器设计。
最后，PHP 驱动支持客户端对查询结果进行缓存。通过在内存中存储行，可以减少“随后服务器按行获取结果集所需要的往返”。
微软 SQL Server PHP 驱动3.0可从微软下载中心下载，相关文档可在 MSDN 上找到。另外，源代码使用 Apache 许可发布在 CodePlex 上。而目前可用的 PHP 驱动只有 Windows 版本。
查看英文原文：http://www.infoq.com/news/2012/03/PHP-SQL-Server-2012
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