Yii\u6846\u67b6\u6570\u636e\u5e93\u591a\u6570\u636e\u5e93\u3001\u4e3b\u4ece\u3001\u8bfb\u5199\u5206\u79bb \u5b9e\u73b0<\/p>\n
\/**\r\n * \u4e3b\u6570\u636e\u5e93 \u5199 \u4ece\u6570\u636e\u5e93\uff08\u53ef\u591a\u4e2a\uff09\u8bfb\r\n * \u5b9e\u73b0\u4e3b\u4ece\u6570\u636e\u5e93 \u8bfb\u5199\u5206\u79bb \u4e3b\u670d\u52a1\u5668\u65e0\u6cd5\u8fde\u63a5 \u4ece\u670d\u52a1\u5668\u53ef\u5207\u6362\u5199\u529f\u80fd\r\n * \u4ece\u52a1\u5668\u65e0\u6cd5\u8fde\u63a5 \u4e3b\u670d\u52a1\u5668\u53ef\u5207\u6362\u8bfb\u529f\r\n * *\/\r\nclass DbConnectionMan extends CDbConnection {\r\n\r\n public $timeout = 10; \/\/\u8fde\u63a5\u8d85\u65f6\u65f6\u95f4\r\n public $markDeadSeconds = 600; \/\/\u5982\u679c\u4ece\u6570\u636e\u5e93\u8fde\u63a5\u5931\u8d25 600\u79d2\u5185\u4e0d\u518d\u8fde\u63a5 \r\n \/\/\u7528 cache \u4f5c\u4e3a\u7f13\u5b58\u5168\u5c40\u6807\u8bb0\r\n public $cacheID = 'cache';\r\n\r\n \/**\r\n * @var array $slaves.Slave database connection(Read) config array.\r\n * \u914d\u7f6e\u7b26\u5408 CDbConnection.\r\n * @example\r\n * 'components'=>array(\r\n * \t\t'db'=>array(\r\n * \t\t\t'connectionString'=>'mysql:\/\/<master>',\r\n * \t\t\t'slaves'=>array(\r\n * \t\t\t\tarray('connectionString'=>'mysql:\/\/<slave01>'),\r\n * \t\t\t\tarray('connectionString'=>'mysql:\/\/<slave02>'),\r\n * \t\t\t)\r\n * \t\t)\r\n * )\r\n * *\/\r\n public $slaves = array();\r\n\r\n \/**\r\n * \r\n * \u4ece\u6570\u636e\u5e93\u72b6\u6001 false \u5219\u53ea\u7528\u4e3b\u6570\u636e\u5e93\r\n * @var bool $enableSlave\r\n * *\/\r\n public $enableSlave = true;\r\n\r\n \/**\r\n * @var slavesWrite \u7d27\u6025\u60c5\u51b5\u4e3b\u6570\u636e\u5e93\u65e0\u6cd5\u8fde\u63a5 \u5207\u6362\u4ece\u670d\u52a1\u5668\uff08\u8bfb\u5199\uff09.\r\n *\/\r\n public $slavesWrite = false;\r\n\r\n \/**\r\n * @var masterRead \u7d27\u6025\u60c5\u51b5\u4ece\u4e3b\u6570\u636e\u5e93\u65e0\u6cd5\u8fde\u63a5 \u5207\u6362\u4ece\u4f4f\u670d\u52a1\u5668\uff08\u8bfb\u5199\uff09.\r\n *\/\r\n public $masterRead = false;\r\n\r\n \/**\r\n * @var _slave\r\n *\/\r\n private $_slave;\r\n\r\n \/**\r\n * @var _disableWrite \u4ece\u670d\u52a1\u5668\uff08\u53ea\u8bfb\uff09.\r\n *\/\r\n private $_disableWrite = true;\r\n\r\n \/**\r\n *\r\n * \u91cd\u5199 createCommand \u65b9\u6cd5,1.\u5f00\u542f\u4ece\u5e93 2.\u5b58\u5728\u4ece\u5e93 3.\u5f53\u524d\u4e0d\u5904\u4e8e\u4e00\u4e2a\u4e8b\u52a1\u4e2d 4.\u4ece\u5e93\u8bfb\u6570\u636e\r\n * @param string $sql\r\n * @return CDbCommand\r\n * *\/\r\n public function createCommand($sql = null) {\r\n if ($this->enableSlave && !empty($this->slaves) && is_string($sql) && !$this->getCurrentTransaction() && self::isReadOperation($sql) && ($slave = $this->getSlave())\r\n ) {\r\n return $slave->createCommand($sql);\r\n } else {\r\n if (!$this->masterRead) {\r\n if ($this->_disableWrite && !self::isReadOperation($sql)) {\r\n\r\n throw new CDbException(\"Master db server is not available now!Disallow write operation on slave server!\");\r\n }\r\n }\r\n return parent::createCommand($sql);\r\n }\r\n }\r\n\r\n \/**\r\n * \u83b7\u5f97\u4ece\u670d\u52a1\u5668\u8fde\u63a5\u8d44\u6e90\r\n * @return CDbConnection\r\n * *\/\r\n public function getSlave() {\r\n\r\n if (!isset($this->_slave)) {\r\n\r\n shuffle($this->slaves);\r\n foreach ($this->slaves as $slaveConfig) {\r\n\r\n if ($this->_isDeadServer($slaveConfig['connectionString'])) {\r\n continue;\r\n }\r\n if (!isset($slaveConfig['class']))\r\n $slaveConfig['class'] = 'CDbConnection';\r\n\r\n $slaveConfig['autoConnect'] = false;\r\n try {\r\n if ($slave = Yii::createComponent($slaveConfig)) {\r\n Yii::app()->setComponent('dbslave', $slave);\r\n $slave->setAttribute(PDO::ATTR_TIMEOUT, $this->timeout);\r\n $slave->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true);\r\n $slave->setActive(true);\r\n $this->_slave = $slave;\r\n break;\r\n }\r\n } catch (Exception $e) {\r\n $this->_markDeadServer($slaveConfig['connectionString']);\r\n Yii::log(\"Slave database connection failed!\\n\\tConnection string:{$slaveConfig['connectionString']}\", 'warning');\r\n\r\n continue;\r\n }\r\n }\r\n\r\n if (!isset($this->_slave)) {\r\n $this->_slave = null;\r\n $this->enableSlave = false;\r\n }\r\n }\r\n return $this->_slave;\r\n }\r\n\r\n public function setActive($value) {\r\n if ($value != $this->getActive()) {\r\n if ($value) {\r\n try {\r\n if ($this->_isDeadServer($this->connectionString)) {\r\n throw new CDbException('Master db server is already dead!');\r\n }\r\n \/\/PDO::ATTR_TIMEOUT must set before pdo instance create\r\n $this->setAttribute(PDO::ATTR_TIMEOUT, $this->timeout);\r\n $this->open();\r\n } catch (Exception $e) {\r\n $this->_markDeadServer($this->connectionString);\r\n $slave = $this->getSlave();\r\n Yii::log($e->getMessage(), CLogger::LEVEL_ERROR, 'exception.CDbException');\r\n if ($slave) {\r\n $this->connectionString = $slave->connectionString;\r\n $this->username = $slave->username;\r\n $this->password = $slave->password;\r\n if ($this->slavesWrite) {\r\n $this->_disableWrite = false;\r\n }\r\n $this->open();\r\n } else { \/\/Slave also unavailable\r\n if ($this->masterRead) {\r\n $this->connectionString = $this->connectionString;\r\n $this->username = $this->username;\r\n $this->password = $this->password;\r\n $this->open();\r\n } else {\r\n throw new CDbException(Yii::t('yii', 'CDbConnection failed to open the DB connection.'), (int) $e->getCode(), $e->errorInfo);\r\n }\r\n }\r\n }\r\n } else {\r\n $this->close();\r\n }\r\n }\r\n }\r\n\r\n \/**\r\n * \u68c0\u6d4b\u8bfb\u64cd\u4f5c sql \u8bed\u53e5\r\n * \r\n * \u5173\u952e\u5b57\uff1a SELECT,DECRIBE,SHOW ...\r\n * \u5199\u64cd\u4f5c:UPDATE,INSERT,DELETE ...\r\n * *\/\r\n public static function isReadOperation($sql) {\r\n $sql = substr(ltrim($sql), 0, 10);\r\n $sql = str_ireplace(array('SELECT', 'SHOW', 'DESCRIBE', 'PRAGMA'), '^O^', $sql); \/\/^O^,magic smile\r\n return strpos($sql, '^O^') === 0;\r\n }\r\n\r\n \/**\r\n * \u68c0\u6d4b\u4ece\u670d\u52a1\u5668\u662f\u5426\u88ab\u6807\u8bb0 \u5931\u8d25.\r\n *\/\r\n private function _isDeadServer($c) {\r\n $cache = Yii::app()->{$this->cacheID};\r\n if ($cache && $cache->get('DeadServer::' . $c) == 1) {\r\n return true;\r\n }\r\n return false;\r\n }\r\n\r\n \/**\r\n * \u6807\u8bb0\u5931\u8d25\u7684slaves.\r\n *\/\r\n private function _markDeadServer($c) {\r\n $cache = Yii::app()->{$this->cacheID};\r\n if ($cache) {\r\n $cache->set('DeadServer::' . $c, 1, $this->markDeadSeconds);\r\n }\r\n }\r\n\r\n}<\/pre>\n <\/p>\n<\/div>\n
main.php\u914d\u7f6e\uff1acomponents \u6570\u7ec4\u4e2d<\/p>\n
<\/p>\n
'db'=>array(\r\n 'class'=>'application.extensions.DbConnectionMan',\/\/\u6269\u5c55\u8def\u5f84\r\n 'connectionString' => 'mysql:host=192.168.1.128;dbname=db_xcpt',\/\/\u4e3b\u6570\u636e\u5e93 \u5199\r\n 'emulatePrepare' => true,\r\n 'username' => 'root',\r\n 'password' => 'root',\r\n 'charset' => 'utf8',\r\n 'tablePrefix' => 'xcpt_', \/\/\u8868\u524d\u7f00\r\n 'enableSlave'=>true,\/\/\u4ece\u6570\u636e\u5e93\u542f\u7528\r\n\t 'slavesWrite'=>true,\/\/\u7d27\u6025\u60c5\u51b5 \u4e3b\u6570\u636e\u5e93\u65e0\u6cd5\u8fde\u63a5 \u542f\u7528\u4ece\u6570\u636e\u5e93 \u5199\u529f\u80fd\r\n\t 'masterRead'=>true,\/\/\u7d27\u6025\u60c5\u51b5 \u4ece\u6570\u636e\u5e93\u65e0\u6cd5\u8fde\u63a5 \u542f\u7528\u4e3b\u6570\u636e\u5e93 \u8bfb\u529f\u80fd\r\n 'slaves'=>array(\/\/\u4ece\u6570\u636e\u5e93\r\n array( \/\/slave1\r\n 'connectionString'=>'mysql:host=localhost;dbname=db_kuitao8.com',\r\n 'emulatePrepare' => true,\r\n 'username'=>'root',\r\n 'password'=>'root',\r\n 'charset' => 'utf8',\r\n 'tablePrefix' => 'xcpt_', \/\/\u8868\u524d\u7f00\r\n ),\r\n\t array( \/\/slave2\r\n 'connectionString'=>'mysql:host=localhost;dbname=db_kuitao8.com',\r\n 'emulatePrepare' => true,\r\n 'username'=>'root',\r\n 'password'=>'root',\r\n 'charset' => 'utf8',\r\n 'tablePrefix' => 'xcpt_', \/\/\u8868\u524d\u7f00\r\n ),\r\n\r\n ),\r\n ),<\/pre>\n <\/p>\n","protected":false},"excerpt":{"rendered":"
Yii\u6846\u67b6\u6570\u636e\u5e93\u591a\u6570\u636e\u5e93\u3001\u4e3b\u4ece\u3001\u8bfb\u5199\u5206\u79bb \u5b9e\u73b0 \u529f\u80fd\u63cf\u8ff0\uff1a 1.\u5b9e\u73b0\u4e3b\u4ece\u6570\u636e\u5e93\u8bfb\u5199\u5206\u79bb \u4e3b\u5e93\uff1a\u5199 \u4ece\u5e93(\u53ef\u591a\u4e2a)\uff1a\u8bfb 2.\u4e3b\u6570\u636e\u5e93\u65e0\u6cd5\u8fde\u63a5\u65f6 \u53ef\u8bbe\u7f6e\u4ece\u6570\u636e\u5e93\u662f\u5426 \u53ef\u5199 3.\u6240\u6709\u4ece\u6570\u636e\u5e93\u65e0\u6cd5\u8fde\u63a5\u65f6 \u53ef\u8bbe\u7f6e\u4e3b\u6570\u636e\u5e93\u662f\u5426 \u53ef\u8bfb 4.\u5982\u679c\u4ece\u6570\u636e\u5e93\u8fde\u63a5\u5931\u8d25 \u53ef\u8bbe\u7f6eN\u79d2\u5185\u4e0d\u518d\u8fde\u63a5 \/** * \u4e3b\u6570\u636e\u5e93 \u5199 \u4ece\u6570\u636e\u5e93\uff08\u53ef\u591a\u4e2a\uff09\u8bfb *<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[10],"tags":[30,29,31,32],"_links":{"self":[{"href":"https:\/\/www.codeeel.com\/index.php?rest_route=\/wp\/v2\/posts\/12"}],"collection":[{"href":"https:\/\/www.codeeel.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.codeeel.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.codeeel.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.codeeel.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=12"}],"version-history":[{"count":21,"href":"https:\/\/www.codeeel.com\/index.php?rest_route=\/wp\/v2\/posts\/12\/revisions"}],"predecessor-version":[{"id":33,"href":"https:\/\/www.codeeel.com\/index.php?rest_route=\/wp\/v2\/posts\/12\/revisions\/33"}],"wp:attachment":[{"href":"https:\/\/www.codeeel.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.codeeel.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.codeeel.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}