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                # Workerman/MySQL ## 說明 常駐內存的程序在使用mysql時經常會遇到```mysql gone away```的錯誤,這個是由于程序與mysql的連接長時間沒有通訊,連接被mysql服務端踢掉導致。本數據庫類可以解決這個問題,當發生```mysql gone away```錯誤時,會自動重試一次。 ## 依賴的擴展 該mysql類依賴[pdo](http://php.net/manual/zh/book.pdo.php)和[pdo\_mysql](http://php.net/manual/zh/ref.pdo-mysql.php)兩個擴展,缺少擴展會報```Undefined class constant 'MYSQL\_ATTR\_INIT\_COMMAND' in ....```錯誤。 命令行運行```php -m```會列出所有php cli已安裝的擴展,如果沒有pdo 或者 pdo\_mysql,請自行安裝。 **centos系統** PHP5.x ```php yum install php-pdo yum install php-mysql ``` PHP7.x ```php yum install php70w-pdo_dblib.x86_64 yum install php70w-mysqlnd.x86_64 ``` 如果找不到包名,請嘗試用```yum search php mysql```查找 **ubuntu/debian系統** PHP5.x ```php apt-get install php5-mysql ``` PHP7.x ```php apt-get install php7.0-mysql ``` 如果找不到包名,請嘗試用```apt-cache search php mysql```查找 **以上方法無法安裝?** 如果以上方法無法安裝,請參考[workerman手冊-附錄-擴展安裝-方法三源碼編譯安裝](315304)。 ## 安裝 Workerman/MySQL **方法1:** 可以通過composer安裝,命令行運行以下命令(composer源在國外,安裝過程可能會非常慢)。 ```php composer require workerman/mysql ``` 上面命令成功后會生成vendor目錄,然后在項目中引入vendor下的autoload.php。 ```php require_once __DIR__ . '/vendor/autoload.php'; ``` **方法2:** [下載源碼](https://github.com/walkor/mysql/archive/master.zip),解壓后的目錄放到自己項目中(位置任意),直接require源文件。 ```php require_once '/your/path/of/mysql-master/src/Connection.php'; ``` ## 注意 強烈建議在onWorkerStart回調中初始化數據庫連接,避免在```Worker::runAll();```運行前就初始化連接,在```Worker::runAll();```運行前初始化的連接屬于主進程,子進程會繼承這個連接,主進程和子進程共用相同的數據庫連接會導致的錯誤。 ## 示例 ```php use Workerman\Worker; require_once __DIR__ . '/Workerman/Autoloader.php'; require_once __DIR__ . '/vendor/autoload.php'; $worker = new Worker('websocket://0.0.0.0:8484'); $worker->onWorkerStart = function($worker) { // 將db實例存儲在全局變量中(也可以存儲在某類的靜態成員中) global $db; $db = new Workerman\MySQL\Connection('host', 'port', 'user', 'password', 'db_name'); }; $worker->onMessage = function($connection, $data) { // 通過全局變量獲得db實例 global $db; // 執行SQL $all_tables = $db->query('show tables'); $connection->send(json_encode($all_tables)); }; // 運行worker Worker::runAll(); ``` ## 具體MySQL/Connection用法 ```php // 初始化db連接 $db = new Workerman\MySQL\Connection('host', 'port', 'user', 'password', 'db_name'); // 獲取所有數據 $db->select('ID,Sex')->from('Persons')->where('sex= :sex AND ID = :id')->bindValues(array('sex'=>'M', 'id' => 1))->query(); //等價于 $db->select('ID,Sex')->from('Persons')->where("sex= 'M' AND ID = 1")->query(); //等價于 $db->query("SELECT ID,Sex FROM `Persons` WHERE sex='M' AND ID = 1"); // 獲取一行數據 $db->select('ID,Sex')->from('Persons')->where('sex= :sex')->bindValues(array('sex'=>'M'))->row(); //等價于 $db->select('ID,Sex')->from('Persons')->where("sex= 'M' ")->row(); //等價于 $db->row("SELECT ID,Sex FROM `Persons` WHERE sex='M'"); // 獲取一列數據 $db->select('ID')->from('Persons')->where('sex= :sex')->bindValues(array('sex'=>'M'))->column(); //等價于 $db->select('ID')->from('Persons')->where("sex= 'F' ")->column(); //等價于 $db->column("SELECT `ID` FROM `Persons` WHERE sex='M'"); // 獲取單個值 $db->select('ID,Sex')->from('Persons')->where('sex= :sex')->bindValues(array('sex'=>'M'))->single(); //等價于 $db->select('ID,Sex')->from('Persons')->where("sex= 'F' ")->single(); //等價于 $db->single("SELECT ID,Sex FROM `Persons` WHERE sex='M'"); // 復雜查詢 $db->select('*')->from('table1')->innerJoin('table2','table1.uid = table2.uid')->where('age > :age')->groupBy(array('aid'))->having('foo="foo"')->orderByASC/*orderByDESC*/(array('did')) ->limit(10)->offset(20)->bindValues(array('age' => 13)); // 等價于 $db->query(SELECT * FROM `table1` INNER JOIN `table2` ON `table1`.`uid` = `table2`.`uid` WHERE age > 13 GROUP BY aid HAVING foo="foo" ORDER BY did LIMIT 10 OFFSET 20“); // 插入 $insert_id = $db->insert('Persons')->cols(array( 'Firstname'=>'abc', 'Lastname'=>'efg', 'Sex'=>'M', 'Age'=>13))->query(); 等價于 $insert_id = $db->query("INSERT INTO `Persons` ( `Firstname`,`Lastname`,`Sex`,`Age`) VALUES ( 'abc', 'efg', 'M', 13)"); // 更新 $row_count = $db->update('Persons')->cols(array('sex'))->where('ID=1') ->bindValue('sex', 'F')->query(); // 等價于 $row_count = $db->update('Persons')->cols(array('sex'=>'F'))->where('ID=1')->query(); // 等價于 $row_count = $db->query("UPDATE `Persons` SET `sex` = 'F' WHERE ID=1"); // 刪除 $row_count = $db->delete('Persons')->where('ID=9')->query(); // 等價于 $row_count = $db->query("DELETE FROM `Persons` WHERE ID=9"); // 事務 $db->beginTrans(); .... $db->commitTrans(); // or $db->rollBackTrans(); ```
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