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PDO和消息隊(duì)列的一點(diǎn)個(gè)人理解

Nov 30, 2016 pm 11:59 PM

　　什么是消息隊(duì)列，百度百科說，···消息隊(duì)列····是在消息的傳輸過程中保存消息的容器。

　　看著網(wǎng)上林林總總的文章，都說是為了應(yīng)對(duì)高并發(fā)，處理數(shù)據(jù)量超級(jí)大的一種數(shù)據(jù)容器，也可以說是利用各種方式，先把數(shù)據(jù)存儲(chǔ)在一個(gè)···容器···中，然后，再慢慢從這個(gè)容器中獲取數(shù)據(jù)，實(shí)現(xiàn)·····異步操作數(shù)據(jù)庫(kù)·····的方式，以便降低數(shù)據(jù)庫(kù)的壓力。

　　不管消息隊(duì)列是什么，個(gè)人姑且認(rèn)為它就是一種存儲(chǔ)數(shù)據(jù)的···容器···，就這么簡(jiǎn)單明了，呵呵，因?yàn)楸救藢?duì)消息隊(duì)列這東西研究的比較膚淺。

　　不過，在這里，我還是要賣弄一下一個(gè)個(gè)人的小實(shí)驗(yàn)代碼，呵呵，假若下面的東西與消息隊(duì)列相離太遠(yuǎn)，那么請(qǐng)看官可別見怪哦，因?yàn)槲疑厦嬉呀?jīng)聲明的很清楚了，本人對(duì)這東西還是不甚了解，只不過是工作之余賣弄一下‘文采’而已，所以，假如真有誤解消息隊(duì)列這個(gè)東西，我只能說聲，請(qǐng)你指正我的錯(cuò)誤，讓筆者迷途知返。

　　先給出連接mysql數(shù)據(jù)庫(kù)配置文件mysql.ini的內(nèi)容：

<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

　　數(shù)據(jù)表文件queue.sql的內(nèi)容：

<span style="color: #008080">--</span><span style="color: #008080"> 消息隊(duì)列測(cè)試</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">價(jià)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">商品類別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">備注</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">美國(guó)入口貴重電子產(chǎn)品</span><span style="color: #ff0000">'</span>,<span style="color: #ff0000">'</span><span style="color: #ff0000">請(qǐng)多多銷售</span><span style="color: #ff0000">'</span>),(<span style="color: #0000ff">default</span>,<span style="color: #ff0000">'</span><span style="color: #ff0000">宏基手提電腦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">價(jià)格劃算好電腦</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絨衣</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">以純白色厚皮羽絨服</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>);

　　下面是簡(jiǎn)單的消息隊(duì)列實(shí)現(xiàn)PDO商品入庫(kù)的代碼：

　　鄭重提醒：請(qǐng)認(rèn)真看我的注釋，請(qǐng)認(rèn)真看我的注釋，請(qǐng)認(rèn)真看我的注釋。重要的信息要說三遍，呵呵！

<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類</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">簡(jiǎn)單消息隊(duì)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">$container</span>=<span style="color: #0000ff">array</span><span style="color: #000000">();
    </span><span style="color: #008000">//</span><span style="color: #008000">把PDO對(duì)象存放到屬性中是為了跨方法使用</span>
    <span style="color: #0000ff">static</span> <span style="color: #0000ff">private</span> <span style="color: #800080">$pdo</span><span style="color: #000000">;
    </span><span style="color: #008000">//</span><span style="color: #008000">構(gòu)造函數(shù)實(shí)現(xiàn)初始化PDO連接數(shù)據(jù)庫(kù)</span>
    <span style="color: #0000ff">public</span> <span style="color: #0000ff">function</span> __construct(<span style="color: #800080">$file</span> = './mysql.ini'){<span style="color: #008000">//</span><span style="color: #008000">mysql數(shù)據(jù)庫(kù)的配置文件，./mysql.ini與這個(gè)類是同一個(gè)目錄
        //parse_ini_file函數(shù)作用，解析并獲取ini文件的參數(shù)，加true是二維數(shù)組</span>
        <span style="color: #800080">$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">$dbini</span>['database']['driver'<span style="color: #000000">];
        </span><span style="color: #008000">//</span><span style="color: #008000">這里的數(shù)據(jù)庫(kù)是mysql的總數(shù)據(jù)庫(kù)</span>
        <span style="color: #800080">$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">$dbini</span>['database']['port'<span style="color: #000000">];
        </span><span style="color: #008000">//</span><span style="color: #008000">構(gòu)造PDO連接數(shù)據(jù)庫(kù)的第一個(gè)參數(shù)，這個(gè)參數(shù)這么設(shè)置純屬是PDO類的語(yǔ)法，不懂的可以百度一下，這里就不做詳解了</span>
        <span style="color: #800080">$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">其他連接數(shù)據(jù)庫(kù)參數(shù)</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">初始化設(shè)置PDO選項(xiàng)</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">$options</span><span style="color: #000000">);
            </span><span style="color: #008000">//</span><span style="color: #008000">設(shè)置PDO屬性。拋出錯(cuò)誤報(bào)告</span>
            self::<span style="color: #800080">$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">選擇商品數(shù)據(jù)表所在的數(shù)據(jù)庫(kù)</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數(shù)組
    *成功返回1，失敗返回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轉(zhuǎn)為sql語(yǔ)句，添加到隊(duì)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數(shù)據(jù)id
    *失敗返回失敗信息
    </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">獲取尾部的sql語(yǔ)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">把剩余的容器值賦給中間變量</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">判斷中間變量是否為空，不為空則繼續(xù)獲取容器尾部的數(shù)據(jù)，繼續(xù)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">$sql</span><span style="color: #000000">);
                </span><span style="color: #008000">//</span><span style="color: #008000">把數(shù)據(jù)再轉(zhuǎn)給容器，也就是轉(zhuǎn)給while循環(huán)外面的$middle，這樣才能實(shí)現(xiàn)循環(huán)，讓容器里面的數(shù)據(jù)全部出列，插入到數(shù)據(jù)庫(kù)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，失敗是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">析構(gòu)函數(shù)，對(duì)象回收時(shí)調(diào)用，通過它實(shí)現(xiàn)自動(dòng)讓容器數(shù)據(jù)入庫(kù)</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">當(dāng)對(duì)象被回收時(shí)，判斷容器是否存在消息，假如存在，則調(diào)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>

　　下面是同一級(jí)目錄下調(diào)用這個(gè)類的文件的內(nèi)容，當(dāng)然，你也可以在上面那個(gè)queue類的下面調(diào)用_unshift方法實(shí)現(xiàn)消息隊(duì)列的操作

<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">引入命名空間的Queue類</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手機(jī)8888','price'=>1120,'category_id'=>1,'sort'=>1,'description'=>'vivo品牌','remark'=>'好用'<span style="color: #000000">));
</span><span style="color: #800080">$ob</span>->_unshift(<span style="color: #0000ff">array</span>('goodsname'=>'小米手機(jī)888','price'=>1998,'category_id'=>1,'sort'=>1,'description'=>'小米品牌手機(jī)','remark'=>'國(guó)產(chǎn)好貨'<span style="color: #000000">));
</span><span style="color: #008000">//</span><span style="color: #008000">之所以打印出來(lái)，完成是為了看看效果，至于，有沒有實(shí)現(xiàn)商品入庫(kù)，你得去看看你的數(shù)據(jù)庫(kù)了，呵呵</span>
<span style="color: #008080">var_dump</span>(Queue::<span style="color: #800080">$container</span>);

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