PHP基于MySQL数据库实现对象持久层的方法_PHP

本文实例讲述了PHP基于MySQL数据库实现对象持久层的方法。分享给大家供大家参考。具体如下：

心血来潮，做了一下PHP的对象到数据库的简单持久层。

不常用PHP，对PHP也不熟，关于PHP反射的大部分内容都是现学的。

目前功能比较弱，只是完成一些简单的工作，对象之间的关系还没法映射，并且对象的成员只能支持string或者integer两种类型的。

成员变量的值也没有转义一下。。。

下面就贴一下代码：

首先是数据库的相关定义，该文件定义了数据库的连接属性：

下面是数据库访问的简单封装：

其实上面的两个文件都是之前写好的，持久层的东西是下面的：

hasProperty('tablename')) { 
      throw new Exception("Class '$class' has no [tablename] property"); 
    } 
    $table = $r->getStaticPropertyValue('tablename'); 
    if (!$r->hasProperty('id')) { 
      throw new Exception("Class '$class' has no [id] property");
    } 
    $mpts = Array (); 
    $pts = $r->getProperties(ReflectionProperty :: IS_PUBLIC); 
    foreach ($pts as $pt) { 
      if (!$pt->isStatic()) { 
        array_push($mpts, $pt); 
      } 
    } 
    return Array ( 
      $table, 
      $mpts 
    ); 
  } 
  function SinORM_GetPropertyString($pts, $class, $obj = false, $noid = false) { 
    if (is_null($pts)) { 
      list ($tb, $pts) = SinORM_GetClassPropertys($class); 
    } 
    $s = false; 
    $v = false; 
    $l = false; 
    foreach ($pts as $pt) { 
      $name = $pt->name; 
      if ($noid == false || $name != 'id') { 
        if ($l) { 
          $s = $s . ','; 
        } 
        $s = $s . $name; 
   
        if ($obj) { 
          if ($l) { 
            $v = $v . ','; 
          } 
          $val = $pt->getValue($obj); 
          if (is_null($val)) 
            $v = $v . 'null'; 
          if (is_string($val)) 
            $v = $v . "'$val'"; 
          else 
            $v = $v . $val; 
        } 
        $l = true; 
      } 
    } 
    return Array ( 
      $s, 
      $v 
    ); 
  } 
  function SinORM_GetTableName($class){ 
    $r = new ReflectionClass($class); 
    if (!$r->hasProperty('tablename')) { 
      throw new Exception("Class '$class' has no [tablename] property"); 
    } 
    $table = $r->getStaticPropertyValue('tablename'); 
    if (!$r->hasProperty('id')) { 
      throw new Exception("Class '$class' has no [id] property"); 
    } 
    return $table; 
  } 
  function SinORM_ResetORM($class) { 
    list ($tb, $pts) = SinORM_GetClassPropertys($class); 
    $sql = "CREATE TABLE `$tb` (`id` int NOT NULL AUTO_INCREMENT"; 
    $r = new ReflectionClass($class); 
    $obj = $r->newInstance(); 
    foreach ($pts as $pt) { 
      $val = $pt->getValue($obj); 
      $name = $pt->name; 
      if ($name != 'id') { 
        $sql = $sql . ','; 
      } else { 
        continue; 
      } 
      if (is_null($val)) 
        throw new Exception($class . '->' . "name must have a default value"); 
      if (is_string($val)) 
        $sql = $sql . "`$name` text NULL"; 
      else 
        $sql = $sql . "`$name` int NULL"; 
    } 
    $sql = $sql . ",PRIMARY KEY (`id`));"; 
    $dsql = "DROP TABLE IF EXISTS `$tb`;"; 
    return SinORM_ExecSql($dsql) && SinORM_ExecSql($sql); 
  } 
  function SinORM_SaveObject($obj) { 
    $class = get_class($obj); 
    list ($tb, $pts) = SinORM_GetClassPropertys($class); 
    list ($names, $vals) = SinORM_GetPropertyString($pts, $class, $obj, true); 
    $sql = "INSERT INTO `$tb`($names) values($vals)"; 
    if(SinORM_ExecSql($sql)){ 
      $q = "SELECT `id` FROM `$tb` ORDER BY `id` DESC LIMIT 1;"; 
      $id = SinORM_ExecResult($q); 
      if($id){ 
        $obj->id = $id; 
      } 
    } 
    return false; 
  } 
  function SinORM_GetObjects($class) { 
    list ($tb, $pts) = SinORM_GetClassPropertys($class); 
    $sql = "SELECT * from `$tb`;"; 
    $ary = SinORM_ExecArray($sql); 
    $res = false; 
    if (is_array($ary)) { 
      $res = Array (); 
      $ref = new ReflectionClass($class); 
      foreach ($ary as $a) { 
        $obj = $ref->newInstance(); 
        foreach ($pts as $pt) { 
          $name = $pt->name; 
          $olv = $pt->getValue($obj); 
          $val = $a[$name]; 
          if (is_string($olv)) 
            $pt->setValue($obj, $val); 
          else 
            $pt->setValue($obj, intval($val)); 
        } 
        array_push($res, $obj); 
      } 
    } else { 
      echo 'no'; 
    } 
    return $res; 
  } 
  function SinORM_GetObject($class, $id) { 
    list ($tb, $pts) = SinORM_GetClassPropertys($class); 
    $sql = "SELECT * from `$tb` where `id`=$id;"; 
    $ary = SinORM_ExecArray($sql); 
    $res = null; 
    if (is_array($ary) && count($ary) > 0) { 
      $res = Array (); 
      $ref = new ReflectionClass($class); 
      $a = $ary[0]; 
      $obj = $ref->newInstance(); 
      foreach ($pts as $pt) { 
        $name = $pt->name; 
        $olv = $pt->getValue($obj); 
        $val = $a[$name]; 
        if (is_string($olv)) 
          $pt->setValue($obj, $val); 
        else 
          $pt->setValue($obj, intval($val)); 
      } 
      return $obj; 
    } 
    return null; 
  } 
  function SinORM_Update($obj) { 
    $class = get_class($obj); 
    list ($tb, $pts) = SinORM_GetClassPropertys($class); 
    $sql = "UPDATE `$tb` SET "; 
    $l = false; 
    foreach ($pts as $pt) { 
      $name = $pt->name; 
      $val = $pt->getValue($obj); 
      if ($name == 'id') 
        continue; 
      if ($l) 
        $sql = $sql . ','; 
      if (is_string($val)) 
        $sql = $sql . "$name='$val'"; 
      else 
        $sql = $sql . "$name=$val"; 
      $l = true; 
    } 
    $sql = $sql . " WHERE `id`=$obj->id;"; 
    return SinORM_ExecSql($sql); 
  } 
  function SinORM_SaveOrUpdate($obj) { 
    if (SinORM_GetObject(get_class($obj), $obj->id) == null) { 
      SinORM_SaveObject($obj); 
    } else { 
      SinORM_Update($obj); 
    } 
  } 
  function SinORM_DeleteObject($obj){ 
    $class = get_class($obj); 
    $tb = SinORM_GetTableName($class); 
    $sql = "DELETE FROM `$tb` WHERE `id`=$obj->id;"; 
    return SinORM_ExecSql($sql); 
  } 
  function SinORM_DeleteAll($class){ 
    $tb = SinORM_GetTableName($class); 
    $sql = "DELETE FROM `$tb`;"; 
    return SinORM_ExecSql($sql); 
  } 
?> 

下面是使用的例子：

name = 'TRB'; 
  $user1->age = 22; 
  $user1->email = '[e-mail]'; 
  SinORM_SaveObject($user1); // 把对象保存到数据库中 
   
  // 保存之后会自动给id的 
  $id = $user1->id; 
  echo $id . '
'; 
    
  $user2 = SinORM_GetObject('User', $id); // 通过ID从数据库创建一个对象 
  echo $user2->name . '
'; 
   
  $user1->name = 'trb'; // 改变一下 
  SinORM_Update($user1); // 更新到数据库 
   
  $user3 = SinORM_GetObject('User', $id); // 重新读出 
  echo $user3->name . '
'; 
?> 

希望本文所述对大家的php程序设计有所帮助。