PHP面向对象之事务脚本模式(详解)

如下所示：

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 $check_slot = "SELECt id,name FROM event WHERe space = ? AND (start+duration)>? AND start doStatement(self::$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'));

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