Yii框架分库设计

需求：原网站功能庞大，数据库服务器与数据库众多，有部分数据单库多表都不足以应付业务的快速增长(例如用户系统)。我们便有了分库的需求

 

问题：YII单DB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，支持数据库分库设计

 

解决方法：

 

1、在protected/component目录下面新建一个JUnicomActiveRecord.php文件。代码如下：

 

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、配置数据库配置文件，将用户库中涉及到的数据库链接配置全部补全