PHP面向对象之事务脚本模式(详解)

2021-05-25 16:45PHP教程网 PHP教程

下面小编就为大家带来一篇PHP面向对象之事务脚本模式(详解)。小编觉得挺不错的，现在就分享给大家，也给大家做个参考。一起跟随小编过来看看吧

如下所示：

				?

									/*

									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'));