php object-oriented transaction script mode

In Object-oriented programming (English: Object-oriented programming, abbreviation: OOP), an object is a whole composed of information and a description of how to process the information. It is a description of the real world. abstraction.

In the real world, the things we face are objects, such as computers, televisions, bicycles, etc.

The main three characteristics of the object:

The behavior of the object: What operations can be applied to the object, turning on the light and turning off the light are behaviors.

The shape of the object: how the object responds, color, size, and appearance when those methods are applied.

Representation of objects: The representation of objects is equivalent to an ID card, specifically distinguishing the differences in the same behavior and status.

For example, Animal is an abstract class. We can be specific to a dog and a sheep, and dogs and sheep are specific objects. They have color attributes and can be written , you can run and other behavioral states.

This article mainly introduces the PHP object-oriented transaction script mode

/*
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();
    $ret[&#39;venue&#39;] = array($name);
    $this->doStatement(self::$add_venue,$ret[&#39;venue&#39;]);
    $v_id = self::$DB->lastInsertId();
    $ret[&#39;spaces&#39;] = array();
    foreach($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[&#39;spaces&#39;][] = $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(&#39;test&#39;,array(&#39;test1&#39;,&#39;test2&#39;,&#39;test3&#39;));

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