PDO와 메시지 큐에 대한 개인적인 이해

메시지 큐란 무엇인가요? Baidu Encyclopedia에 따르면... 메시지 큐는... 전송 중에 메시지를 저장하는 컨테이너입니다.

인터넷에 떠도는 각종 글들을 보면 모두 높은 동시성에 대처하고 엄청나게 많은 양의 데이터를 처리하기 위해 사용하는 데이터 컨테이너라고 하더군요. 먼저 데이터를... 컨테이너...에 저장한 다음 이 컨테이너에서 천천히 데이터를 가져와서... 데이터베이스의 비동기 작업을 구현합니다... 데이터베이스에 대한 부담을 줄이기 위해.

메시지 큐가 무엇이든 간에 저는 개인적으로 그것이 데이터를 저장하는 컨테이너라고 생각합니다. 하하, 메시지 큐에 대한 나의 연구는 상대적으로 피상적이기 때문입니다.

그런데 여기서는 그래도 개인적으로 조금 실험적인 코드를 보여드리고 싶습니다. ㅎㅎ, 다음 내용이 메시지 대기열에서 너무 멀다면 놀라지 마세요. 이미 언급했으니까요. 위의 진술은 매우 명확합니다. 나는 퇴근 후 내 ​​"문학적 재능"을 과시하는 것뿐입니다. 따라서 메시지 대기열을 정말로 오해하면 정정해 주십시오. , 작가가 돌아갈 길을 찾을 수 있도록.

먼저 mysql 데이터베이스 구성 파일 mysql.ini의 내용을 제공합니다.

<span style="color: #800000; font-weight: bold">[</span><span style="color: #800000">database</span><span style="color: #800000; font-weight: bold">]</span><span style="color: #000000">
driver </span>=<span style="color: #000000"> mysql
host </span>= 127.0.0.1<span style="color: #000000">
port </span>= 3306<span style="color: #000000">
dbname </span>=<span style="color: #000000"> mysql
username </span>=<span style="color: #000000"> root
password </span>= 1234
<span style="color: #800000; font-weight: bold">[</span><span style="color: #800000">options</span><span style="color: #800000; font-weight: bold">]</span><span style="color: #000000">
PDO::MYSQL_ATTR_INIT_COMMAND </span>= set names utf8

데이터 테이블 파일 queue.sql의 내용:

<span style="color: #008080">--</span><span style="color: #008080"> 消息队列测试</span><span style="color: #008080">
--</span><span style="color: #008080"> 商品表</span>
<span style="color: #0000ff">create</span> <span style="color: #0000ff">table</span><span style="color: #000000"> goods(
id </span><span style="color: #0000ff">int</span> unsigned <span style="color: #0000ff">primary</span> <span style="color: #0000ff">key</span><span style="color: #000000"> auto_increment,
goodsname </span><span style="color: #0000ff">varchar</span>(<span style="color: #800000; font-weight: bold">40</span>) <span style="color: #808080">not</span> <span style="color: #0000ff">null</span> comment <span style="color: #ff0000">'</span><span style="color: #ff0000">商品名</span><span style="color: #ff0000">'</span><span style="color: #000000">,
price </span><span style="color: #0000ff">decimal</span>(<span style="color: #800000; font-weight: bold">9</span>,<span style="color: #800000; font-weight: bold">2</span>) <span style="color: #808080">not</span> <span style="color: #0000ff">null</span> comment <span style="color: #ff0000">'</span><span style="color: #ff0000">价格</span><span style="color: #ff0000">'</span><span style="color: #000000">,
category_id </span><span style="color: #0000ff">tinyint</span> unsigned <span style="color: #808080">not</span> <span style="color: #0000ff">null</span> comment <span style="color: #ff0000">'</span><span style="color: #ff0000">商品类别id</span><span style="color: #ff0000">'</span><span style="color: #000000">,
sort </span><span style="color: #0000ff">tinyint</span> comment <span style="color: #ff0000">'</span><span style="color: #ff0000">商品排序</span><span style="color: #ff0000">'</span><span style="color: #000000">,
description </span><span style="color: #0000ff">varchar</span>(<span style="color: #800000; font-weight: bold">255</span>) comment <span style="color: #ff0000">'</span><span style="color: #ff0000">商品描述</span><span style="color: #ff0000">'</span><span style="color: #000000">,
remark </span><span style="color: #0000ff">varchar</span>(<span style="color: #800000; font-weight: bold">255</span>) comment <span style="color: #ff0000">'</span><span style="color: #ff0000">备注</span><span style="color: #ff0000">'</span><span style="color: #000000">
)engine InnoDB </span><span style="color: #0000ff">default</span> charset<span style="color: #808080">=</span><span style="color: #000000">utf8;
</span><span style="color: #0000ff">insert</span> <span style="color: #0000ff">into</span> goods <span style="color: #0000ff">values</span>(<span style="color: #0000ff">default</span>,<span style="color: #ff0000">'</span><span style="color: #ff0000">iPhone5s</span><span style="color: #ff0000">'</span>,<span style="color: #800000; font-weight: bold">5999</span>,<span style="color: #800000; font-weight: bold">1</span>,<span style="color: #800000; font-weight: bold">1</span>,<span style="color: #ff0000">'</span><span style="color: #ff0000">美国入口贵重电子产品</span><span style="color: #ff0000">'</span>,<span style="color: #ff0000">'</span><span style="color: #ff0000">请多多销售</span><span style="color: #ff0000">'</span>),(<span style="color: #0000ff">default</span>,<span style="color: #ff0000">'</span><span style="color: #ff0000">宏基手提电脑1</span><span style="color: #ff0000">'</span>,<span style="color: #800000; font-weight: bold">4888</span>,<span style="color: #800000; font-weight: bold">3</span>,<span style="color: #800000; font-weight: bold">1</span>,<span style="color: #ff0000">'</span><span style="color: #ff0000">价格划算好电脑</span><span style="color: #ff0000">'</span>,<span style="color: #0000ff">null</span>),(<span style="color: #0000ff">default</span>,<span style="color: #ff0000">'</span><span style="color: #ff0000">f-30绒衣</span><span style="color: #ff0000">'</span>,<span style="color: #800000; font-weight: bold">200</span>,<span style="color: #800000; font-weight: bold">2</span>,<span style="color: #800000; font-weight: bold">1</span>,<span style="color: #ff0000">'</span><span style="color: #ff0000">以纯白色厚皮羽绒服</span><span style="color: #ff0000">'</span>,<span style="color: #0000ff">null</span>),(<span style="color: #0000ff">default</span>,<span style="color: #ff0000">'</span><span style="color: #ff0000">n-100鞋子</span><span style="color: #ff0000">'</span>,<span style="color: #800000; font-weight: bold">300</span>,<span style="color: #800000; font-weight: bold">4</span>,<span style="color: #800000; font-weight: bold">1</span>,<span style="color: #ff0000">'</span><span style="color: #ff0000">Nick品牌</span><span style="color: #ff0000">'</span>,<span style="color: #0000ff">null</span>);

다음은 간단한 메시지 큐를 사용하여 PDO 제품 저장소를 구현하는 코드입니다.

엄숙한 알림: 내 주석을 주의 깊게 읽어주세요. 중요한 정보는 세 번 말해야 해요, 하하!

<?<span style="color: #000000">php
namespace Home;
</span><span style="color: #008080">header</span>('content-type:text/html;charset=utf-8;'<span style="color: #000000">);
</span><span style="color: #008000">//</span><span style="color: #008000">引入PDO类</span>
<span style="color: #0000ff">use</span><span style="color: #000000"> \PDO;
</span><span style="color: #0000ff">use</span><span style="color: #000000"> \PDOStatement;
</span><span style="color: #0000ff">use</span><span style="color: #000000"> \PDOException;
</span><span style="color: #008000">/*</span><span style="color: #008000">简单消息队列</span><span style="color: #008000">*/</span>
<span style="color: #0000ff">class</span><span style="color: #000000"> Queue{
    </span><span style="color: #008000">//</span><span style="color: #008000">容器可以是私有，最好是公有</span>
    <span style="color: #0000ff">static</span> <span style="color: #0000ff">public</span> <span style="color: #800080">$container</span>=<span style="color: #0000ff">array</span><span style="color: #000000">();
    </span><span style="color: #008000">//</span><span style="color: #008000">把PDO对象存放到属性中是为了跨方法使用</span>
    <span style="color: #0000ff">static</span> <span style="color: #0000ff">private</span> <span style="color: #800080">$pdo</span><span style="color: #000000">;
    </span><span style="color: #008000">//</span><span style="color: #008000">构造函数实现初始化PDO连接数据库</span>
    <span style="color: #0000ff">public</span> <span style="color: #0000ff">function</span> __construct(<span style="color: #800080">$file</span> = './mysql.ini'){<span style="color: #008000">//</span><span style="color: #008000">mysql数据库的配置文件，./mysql.ini与这个类是同一个目录
        //parse_ini_file函数作用，解析并获取ini文件的参数，加true是二维数组</span>
        <span style="color: #800080">$dbini</span>        = <span style="color: #008080">parse_ini_file</span>(<span style="color: #800080">$file</span>,<span style="color: #0000ff">true</span><span style="color: #000000">);
        </span><span style="color: #800080">$driver</span>        = <span style="color: #800080">$dbini</span>['database']['driver'<span style="color: #000000">];
        </span><span style="color: #008000">//</span><span style="color: #008000">这里的数据库是mysql的总数据库</span>
        <span style="color: #800080">$dbname</span>        = <span style="color: #800080">$dbini</span>['database']['dbname'<span style="color: #000000">];
        </span><span style="color: #800080">$host</span>        = <span style="color: #800080">$dbini</span>['database']['host'<span style="color: #000000">];
        </span><span style="color: #800080">$port</span>        = <span style="color: #800080">$dbini</span>['database']['port'<span style="color: #000000">];
        </span><span style="color: #008000">//</span><span style="color: #008000">构造PDO连接数据库的第一个参数，这个参数这么设置纯属是PDO类的语法，不懂的可以百度一下，这里就不做详解了</span>
        <span style="color: #800080">$dsn</span> = <span style="color: #800080">$driver</span>.':'.'dbname='.<span style="color: #800080">$dbname</span>.';host='.<span style="color: #800080">$host</span>.';port='.<span style="color: #800080">$port</span><span style="color: #000000">;
        </span><span style="color: #008000">//</span><span style="color: #008000">其他连接数据库参数</span>
        <span style="color: #800080">$username</span>    = <span style="color: #800080">$dbini</span>['database']['username'<span style="color: #000000">];
        </span><span style="color: #800080">$password</span>    = <span style="color: #800080">$dbini</span>['database']['password'<span style="color: #000000">];
        </span><span style="color: #800080">$options</span>    = <span style="color: #800080">$dbini</span>['options'];<span style="color: #008000">//</span><span style="color: #008000">初始化设置PDO选项</span>
        <span style="color: #0000ff">try</span><span style="color: #000000">{
            self</span>::<span style="color: #800080">$pdo</span> = <span style="color: #0000ff">new</span> PDO(<span style="color: #800080">$dsn</span>,<span style="color: #800080">$username</span>,<span style="color: #800080">$password</span>,<span style="color: #800080">$options</span><span style="color: #000000">);
            </span><span style="color: #008000">//</span><span style="color: #008000">设置PDO属性。抛出错误报告</span>
            self::<span style="color: #800080">$pdo</span>->setAttribute(PDO::ATTR_ERRMODE,PDO::<span style="color: #000000">ERRMODE_EXCEPTION);
            </span><span style="color: #0000ff">try</span><span style="color: #000000">{
                </span><span style="color: #008000">//</span><span style="color: #008000">选择商品数据表所在的数据库</span>
                self::<span style="color: #800080">$pdo</span>-><span style="color: #008080">exec</span>('use queue'<span style="color: #000000">);
            }</span><span style="color: #0000ff">catch</span>(PDOException <span style="color: #800080">$e</span><span style="color: #000000">){
                </span><span style="color: #0000ff">echo</span> <span style="color: #800080">$e</span>-><span style="color: #000000">getMessage();
            }
        }</span><span style="color: #0000ff">catch</span>(PDOException <span style="color: #800080">$e</span><span style="color: #000000">){
            </span><span style="color: #0000ff">echo</span> <span style="color: #800080">$e</span>-><span style="color: #000000">getMessage();
        }
    }
    </span><span style="color: #008000">/*</span><span style="color: #008000">
    *入列
    *$data数组
    *成功返回1，失败返回false，或者null
    </span><span style="color: #008000">*/</span>
    <span style="color: #0000ff">public</span> <span style="color: #0000ff">function</span> _unshift(<span style="color: #800080">$data</span> =<span style="color: #0000ff">array</span><span style="color: #000000">()){
        </span><span style="color: #0000ff">if</span>(!<span style="color: #008080">is_array</span>(<span style="color: #800080">$data</span>) || <span style="color: #0000ff">empty</span>(<span style="color: #800080">$data</span>)){<span style="color: #0000ff">return</span> <span style="color: #0000ff">false</span><span style="color: #000000">;}
        </span><span style="color: #800080">$sql</span> = 'default'<span style="color: #000000">;
        </span><span style="color: #0000ff">foreach</span>(<span style="color: #800080">$data</span> <span style="color: #0000ff">as</span> <span style="color: #800080">$k</span>=><span style="color: #800080">$v</span><span style="color: #000000">){
            </span><span style="color: #800080">$sql</span> .= ',"'.<span style="color: #800080">$v</span>.'"'<span style="color: #000000">;
        }
        </span><span style="color: #008000">//</span><span style="color: #008000">把$data转为sql语句，添加到队列容器contain中</span>
        <span style="color: #800080">$sql</span> = 'insert into goods values('.<span style="color: #800080">$sql</span>.')'<span style="color: #000000">;
        </span><span style="color: #0000ff">return</span> @<span style="color: #008080">array_unshift</span>(self::<span style="color: #800080">$container</span>,<span style="color: #800080">$sql</span><span style="color: #000000">);
    }
    </span><span style="color: #008000">/*</span><span style="color: #008000">
    *出列
    *成功返回最后插入的数据id
    *失败返回失败信息
    </span><span style="color: #008000">*/</span>
    <span style="color: #0000ff">private</span> <span style="color: #0000ff">static</span> <span style="color: #0000ff">function</span><span style="color: #000000"> _pop(){
        </span><span style="color: #0000ff">try</span>{<span style="color: #008000">//</span><span style="color: #008000">获取尾部的sql语句，出列</span>
            <span style="color: #800080">$sql</span> = <span style="color: #008080">array_pop</span>(self::<span style="color: #800080">$container</span><span style="color: #000000">);
            self</span>::<span style="color: #800080">$pdo</span>-><span style="color: #008080">exec</span>(<span style="color: #800080">$sql</span><span style="color: #000000">);
            </span><span style="color: #008000">//</span><span style="color: #008000">把剩余的容器值赋给中间变量</span>
            <span style="color: #800080">$middle</span> = self::<span style="color: #800080">$container</span><span style="color: #000000">;
            </span><span style="color: #008000">//</span><span style="color: #008000">判断中间变量是否为空，不为空则继续获取容器尾部的数据，继续出列</span>
            <span style="color: #0000ff">while</span>(<span style="color: #800080">$middle</span><span style="color: #000000">){
                </span><span style="color: #800080">$sql</span> = <span style="color: #008080">array_pop</span>(<span style="color: #800080">$middle</span><span style="color: #000000">);
                self</span>::<span style="color: #800080">$pdo</span>-><span style="color: #008080">exec</span>(<span style="color: #800080">$sql</span><span style="color: #000000">);
                </span><span style="color: #008000">//</span><span style="color: #008000">把数据再转给容器，也就是转给while循环外面的$middle，这样才能实现循环，让容器里面的数据全部出列，插入到数据库中</span>
                self::<span style="color: #800080">$container</span> = <span style="color: #800080">$middle</span><span style="color: #000000">;
            }
            </span><span style="color: #008000">//</span><span style="color: #008000">返回的是，最后插入的id，失败是null</span>
            <span style="color: #0000ff">return</span> self::<span style="color: #800080">$pdo</span>-><span style="color: #000000">lastInsertId();

            }</span><span style="color: #0000ff">catch</span>(PDOException <span style="color: #800080">$e</span><span style="color: #000000">){
                </span><span style="color: #0000ff">return</span> <span style="color: #800080">$e</span>-><span style="color: #000000">getMessage();
            }
    }
    </span><span style="color: #008000">//</span><span style="color: #008000">析构函数，对象回收时调用，通过它实现自动让容器数据入库</span>
    <span style="color: #0000ff">public</span> <span style="color: #0000ff">function</span><span style="color: #000000"> __destruct(){
        </span><span style="color: #008000">//</span><span style="color: #008000">当对象被回收时，判断容器是否存在消息，假如存在，则调用_pop方法，把消息出列</span>
        <span style="color: #0000ff">if</span>(self::<span style="color: #800080">$container</span><span style="color: #000000">){
            self</span>::<span style="color: #000000">_pop();
        }
    }
}</span>

다음은 동일한 레벨 디렉터리에서 이 클래스를 호출하는 파일의 내용입니다. 물론 위의 queue 클래스 아래에 _unshift 메서드를 호출하여 메시지 대기열 작업을 구현할 수도 있습니다

<?<span style="color: #000000">php
</span><span style="color: #0000ff">include</span> './queue.php'<span style="color: #000000">;
</span><span style="color: #0000ff">use</span> Home\Queue;<span style="color: #008000">//</span><span style="color: #008000">引入命名空间的Queue类</span>
<span style="color: #800080">$ob</span> = <span style="color: #0000ff">new</span><span style="color: #000000"> Queue;
</span><span style="color: #008000">//</span><span style="color: #008000">消息入列</span>
<span style="color: #800080">$ob</span>->_unshift(<span style="color: #0000ff">array</span>('goodsname'=>'vivo手机8888','price'=>1120,'category_id'=>1,'sort'=>1,'description'=>'vivo品牌','remark'=>'好用'<span style="color: #000000">));
</span><span style="color: #800080">$ob</span>->_unshift(<span style="color: #0000ff">array</span>('goodsname'=>'小米手机888','price'=>1998,'category_id'=>1,'sort'=>1,'description'=>'小米品牌手机','remark'=>'国产好货'<span style="color: #000000">));
</span><span style="color: #008000">//</span><span style="color: #008000">之所以打印出来，完成是为了看看效果，至于，有没有实现商品入库，你得去看看你的数据库了，呵呵</span>
<span style="color: #008080">var_dump</span>(Queue::<span style="color: #800080">$container</span>);