public function __construct()
{
$className = get_class($this);
//默认连接的数据库配置项
$dbName = "DEFAULT_DB";
//判断子类是否有getSource方法，如果有，代表要设置新的数据库配置项
$hasSourceMethod = method_exists($this, "getSource");
if ($hasSourceMethod) {
$dbName = $this->getSource();
}
$tableName = toUnderLineName(getClassFileName($className));
$this->_className = $tableName;
$db = M($tableName, $dbName);
$this->_db = $db;
}
/**
* 系统初始化函数，主要初始化smarty模板引擎，定义一些主要的全局模板路径
* @param $c 控制器名称
*/
public function _sys_init_action($c)
{
$this->smt = new Smarty();
$this->smt->left_delimiter = "{";
$this->smt->right_delimiter = "}";
//模板目录，模板命名为方法名驼峰转下划线，再小写
$tmpDir = APP_PATH . "/tpl/" . strtolower(toUnderLineName($c));
//模板编译缓存目录
$cmpDir = TEMP_PATH . "/tpl_c";
$this->smt->setTemplateDir($tmpDir)->setCompileDir($cmpDir);
//定义程序相对路径
$this->smt->assign("myf_path", getBasePath());
//定义程序绝对URL路径
$this->smt->assign("myf_full_url", getFullURL());
//定义程序根目录绝对URL路径
$this->smt->assign("myf_project_url", getProjectURL());
}