PHP面向对象之事务脚本模式示例详解

/* 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 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 $check_slot = "SELECT id,name FROM event WHERE space = ? AND (start+duration)>? AND start doStatement(self::$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'));