/*事务脚本模式: 类似于thinkphp中的model层,或者说就是操作数据库的类。 个人觉得实践中使用起来还是挺简单方便的,就是SQL语句写死了的话,灵活性就不够。 示例代码如下:*/namespace woo\process;abstract class Base{static $DB; //pdo对象static $stmts = array(); //sql语句句柄function __construct (){$dsn = \woo\base\ApplicationRegistry::getDSN();if(is_null($dsn)){throw new \woo\base\AppException("No DSN"); } self::$DB = new PDO($dsn); self::$DB->setAttribute(\PDO::ATTR_ERRMODE,\PDO::ERRMODE_EXCEPTION); } function prepareStatement($stmt_s){ //缓存sql语句句柄if(isset(self::$stmts($stmt_s)){return self::$stmts[$stmt_s]; }$stmt_handle = self::$DB->prepare($stmt_s); self::$stmts[$stmt_s] = $stmt_handle;return $stmt_handle; } protected function doStatement($stmt_s,$values_a){ //执行sql并获取一个语句资源$sth = $this->prepareStatement($stmt_s);$sth->closeCursor();$db_result = $sth->execute($values_a);return $sth; } }//这个类就是向数据库中写入一些数据,比较简单没什么好多说的class VenueManager extends Base{static $add_venue = "INSERT INTO venue (name) values(?)";static $add_space = "INSERT INTO space (name,venue) values(?,?)";static $check_slot = "SELECT id,name FROM event WHERE space = ? AND (start+duration)>? AND start <?";static $add_event = "INSERT INTO event (name,space,start,duration) values(?,?,?,?)"; function addVenue($name,$space_array){$ret = array();$ret['venue'] = array($name);$this->doStatement(self::$add_venue,$ret['venue']);$v_id = self::$DB->lastInsertId();$ret['spaces'] = array();foreach($space_array as $space_name){$values = array($space_name,$v_id);$this->doStatement(self::$add_space,$values);$s_id = self::$DB->lastInsertId();array_unshift($values,$s_id);$ret['spaces'][] = $values; }return $ret; } function bookEvent ($space_id,$name,$time,$duration){$values = array($space_id,$time,($time+$duration));$stmt = $this->doStatement(self::$check_slot,$values,false);if($result = $stmt->fetch()){throw new \woo\base\AppException("double booked! try again"); }$this->doStatement(self::$add_event,array($name,$space_id,$time,$duration)); } }//客户端,使用起来还是比较简便的$venue = new VenueManager();$venue->addVenue('test',array('test1','test2','test3'));
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