PHP面向对象之事务脚本模式(详解)

/*
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 wooprocess;

abstract class base{
  static $db;         //pdo对象
  static $stmts = array(); //sql语句句柄
  
  function __construct (){
    $dsn = woobaseapplicationregistry::getdsn();
    if(is_null($dsn)){
      throw new woobaseappexception("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 woobaseappexception("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'));