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php的Memcache方法介绍及应用实例

Jun 08, 2016 pm 05:27 PM
key memcache nbsp replace set

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网络开发中,特别是大访问量的web项目开发中。为提高响应速度,减少数据查询运算都会选用memcache。
现在网上介绍Memcache安装的已经很多,不再赘述。再次着重介绍memcache的一些常用方法。
Memcache::add // 添加一个值,如果已经存在,则返回false
Memcache::addServer // 添加Memcache地址
Memcache::close // 关闭一个Memcache的连接
Memcache::connect // 打开一个到Memcache的连接
Memcache::decrement // 对保存的某个key中的值进行减法操作
Memcache::delete // 删除一个Memcache上的key值
Memcache::flush // 刷新所有Memcache上保存的项目(类似于删除所有的保存的项目)
Memcache::get // 从Memcache上获取一个key值
Memcache::getExtendedStats // 获取进程池中所有进程的运行系统统计
Memcache::getServerStatus // 获取运行服务器的参数
Memcache::getStats //获取当前Memcache服务器运行的状态
Memcache::getVersion // 返回运行的Memcache的版本信息
Memcache::increment // 对保存的某个key中的值进行加法操作
Memcache::pconnect // 打开一个到Memcache的长连接
Memcache::replace // 替换一个已经存在Memcache服务器上的项目(功能类似Memcache::set)
Memcache::set // 向Memcache添加一个值,如果已经存在,则覆写
Memcache::setCompressThreshold // 对大于某一大小的数据进行压缩
Memcache::setServerParams // 在运行时修改服务器的参数
下面是一些简单的用法实例,仅供参考:
     $mem = new Memcache;
  $mem->connect("127.0.0.1", 12000);
  //Memcache::set方法有四个参数,第一个参数是key,第二个参数是value,第三个参数可选,表示是否压缩保存,第四个参数可选,用来设置一个过期自动销毁的时间
  $mem->set('test','123',0,60);
  //Memcache::add方法的作用和Memcache::set方法类似,区别是如果 Memcache::add方法的返回值为false,表示这个key已经存在,而Memcache::set方法则会直接覆写。
$mem->add('test','123',0,60);
//Memcache::get方法的作用是获取一个key值,Memcache::get方法有一个参数,表示key。
$mem->get('test');//输出为'123'
//Memcache::replace 方法的作用是对一个已有的key进行覆写操作,Memcache::replace方法有四个参数,作用和Memcache::set方法的相同。
$mem->replace('test','456',0,60);
//Memcache::delete方法的作用是删除一个key值,Memcache::delete方法有两个参数,第一个参数表示key,第二个参数可选,表示删除延迟的时间。
$mem->delete('test',60);
?>

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