Yii框架分表设计

需求：原网站功能庞大，数据库服务器与数据库众多，有部分数据单表已经无法满足我们的需求。我们便有了分表的需求

 

问题：YII单表方式已经满足不了我们的需求，急切需要对YII进行扩展设计，支持数据库分表设计

 

解决方法：1、新建protected/sinashowExt/JActiveRecord.php文件

class JUnicomActiveRecord extends Ar 
{
	public $dbname		= 'unicom1';
	public $userIdKey	= 'user_id';
	protected $_userId;
	
	/**
	 * 获得DBConnenction(non-PHPdoc)
	 * @see CActiveRecord::getDbConnection()
	 */
	public function getDbConnection()
	{
		if ($this->hasProperty($this->userIdKey))
		{
			$this->dbname	= $this->chooseDb($this->{$this->userIdKey});
		}
		elseif ($this->_userId) 
		{
			$this->dbname	= $this->chooseDb($this->_userId);
		}
		return parent::getDbConnection();
	}
	
	/**
     * 选择数据库
     */
    public function chooseDb($userId)
    {
        $unicom = 'unicom2';
        $userId = (float)$userId;
    	switch ($userId)
    	{
    		case $userId >= 10000 && $userId <= 29999999:
    			$unicom = 'unicom1';
    			break;
    		case $userId >= 30000000 && $userId <= 39999999:
    			$unicom = 'unicom2';
    			break;
    		case $userId >= 40000000 && $userId <= 49999999:
    			$unicom = 'unicom3';
    			break;
    		case $userId >= 50000000 && $userId <= 59999999:
    			$unicom = 'unicom4';
    			break;
    		case $userId >= 60000000 && $userId <= 69999999:
    			$unicom = 'unicom5';
    			break;
    		case $userId >= 70000000 && $userId <= 89999999:
    			$unicom = 'unicom6';
    			break;
    		case $userId >= 210000000 && $userId <= 239999999:
    			$unicom = 'unicom7';
    			break;
    		case $userId >= 240000000 && $userId <= 269999999:
    			$unicom = 'unicom8';
    			break;
    		case $userId >= 270000000 && $userId <= 299999999:
    			$unicom = 'unicom27';
    			break;
    		case $userId >= 1000000000 && ($userId % 2) == 0:
    			$unicom = 'unicom9';
    			break;
    		case $userId >= 1000000000 && ($userId % 2) == 1:
    			$unicom = 'unicom10';
    			break;
         }
         return $unicom;
    }
    
    /**
     * 设置用户ID
     *
     * @param int $user_id
     */
    public function setUserId($user_id)
    {
    	$this->_userId	= $user_id;
    	return $this;
    }
}

.2、为了兼容以前的程序。我们重写protected/component/Ar.php文件来继承JActiveRecord类，代码如下：

class Ar extends JActiveRecord
{
}