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：

<?php /*  * Filename: database.php  * Created on 2012-9-29  * Created by RobinTang  * To change the template for this generated file go to  * Window - Preferences - PHPeclipse - PHP - Code Templates  */   include_once("config.php");   $debug = false;   $g_out = false;   function out($s){     global $g_out;     $g_out .= $s;     $g_out .= "\r\n";   }   function db_openconnect(){     $con = mysql_connect(DBHOST, DBUSER, DBPSWD);          if(!mysql_set_charset("utf8", $con)){       out("set mysql encoding fail");     }     if (!$con){       out('Could not connect: ' . mysql_error());     }     else{       if(!mysql_select_db(DBNAME, $con)){         $dbn = DBNAME;         out("Could select database '$dbn' : " . mysql_error());      }       $sql = "set time_zone = '+8:00';";       if(!db_onlyquery($sql, $con)){         out("select timezone fail!" . mysql_error());       }     }     return $con;   }   function db_colseconnect($con){     mysql_close($con);   }   function db_onlyquery($sql, $con){     $r = mysql_query($sql, $con);     if(!$r){       out("query '$sql' :fail");       return false;     }     else{       return $r;     }   }   function db_query($sql){     $con = db_openconnect();     $r = db_onlyquery($sql, $con);     $res = false;     if($r){       $res = true;     }     db_colseconnect($con);     return $r;   }   function db_query_effect_rows($sql){     $con = db_openconnect();     $r = db_onlyquery($sql, $con);     $res = false;     if($r){       $res = mysql_affected_rows($con);       if($res==0){         $res = -1;       }     }     else{       $res = false;     }     db_colseconnect($con);     return $res;   }   function db_getresult($sql){     $con = db_openconnect();     $r = db_onlyquery($sql, $con);     $res = false;     if($r && $arr = mysql_fetch_row($r)){       $res = $arr[0];     }     db_colseconnect($con);     return $res;   }   function db_getarray($sql){     $con = db_op<mark>@本文来源gaodaimacom搞#代%码@网-</mark><strong>搞代gaodaima码</strong>enconnect();     $r = db_onlyquery($sql, $con);     $ret = false;     if($r){       $row = false;       $len = 0;       $ret = Array();       $i = 0;       while($arr = mysql_fetch_row($r)){         if($row == false || $len==0){           $row = Array();           $len = count($arr);           for($i=0;$i<$len;++$i){             $key = mysql_field_name($r, $i);             array_push($row, $key);           }         }         $itm = Array();         for($i=0;$i 

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;   $user1->email = '[email protected]';   SinORM_SaveObject($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 . '<br />';       $user2 = SinORM_GetObject('User', $id); // 通过ID从数据库创建一个对象   echo $user2->name . '<br />';      $user1->name = 'trb'; // 改变一下   SinORM_Update($user1); // 更新到数据库      $user3 = SinORM_GetObject('User', $id); // 重新读出   echo $user3->name . '<br />'; ?> 

希望本文所述对大家的php程序设计有所帮助。

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