Home Backend Development PHP Tutorial YII动态模型(动态表名)支持分析_php实例

YII动态模型(动态表名)支持分析_php实例

Jun 07, 2016 pm 05:08 PM
yii

本文分析了YII动态模型(动态表名)支持机制。分享给大家供大家参考,具体如下:

给YII 框架增加动态模型支持

Yii框架中的数据模型使用静态机制,如果要使用模型方式操作某张数据表,就必须得事先创建数据表对应的模型类(位于 protected/models 目录下),这种方式,在有的情况下给我们的工作带来了一些不便,如仅仅将数据表进行显示,或者数据表是动态生成的,或者要实现数据表模型中的读写分离,(如数据写入与数据呈现逻辑可能定义到不同的模型中,以提高性能,如前后台的分离)。

为解决这个问题,经过我反复调试,已经为Yii 扩展出了动态数据表模型支持,使用时简单提供表名,即可将其当作普通的数据表模型进行操作,当然带来的问题就是无数据验证。即使是这样,也给数据显示带来极大的方便。如果在使用的过程中有任何问题,可随时联系笔者信箱 zhangxugg@163.com 进行探讨或索取源码。

处理方法如下:

请将我提供的DbTable.php 放置到 protected/models/ 目录下,然后就可以在任何位置使用之。

产生新记录:

$memo = new DTable('{{memo}}');
$memo->msg = 'this is content';
$memo->save();
//last insertid
echo $memo->id ;

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读取已有记录:

$memo = DTable::model('{{memo}}')->findByPk(12);
$memo->msg = "modefid content";
$memo->save();
//使用非默认数据库,需要在 config/main.php 文件中定义数据库连接,如: 
'components' => array(
'db-other'=>array(
      'class' => 'CDbConnection',
      'connectionString' => 'mysql:host=localhost;dbname=cdcol;charset=utf8',
      'username' => 'root',
      'password' =>'',
      'tablePrefix' => '',
      'autoConnect' => false,
),
);
DTable::$db = Yii::app()->getComponent('db-other');
$memo = DTable::model('{{memo}}')->findByPk(12);

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Dynamic model supports for Yii framework 1.1.10

/**
* DTable class file.
* @author zhangxugg@163.com
* @since Yii 1.1.10
* @package application.models
* @version $Id DTable.php 1 2012-03-24 23:29 $
DTable provides dynamic table model supports for some application entironment such as dynamic-generated database tables, or simple read actions. 
please contact zhangxugg@163.com for the source code.

new record :

$model = new DTable('table_name'); 
//use table prefix:
$model = new DTable('{{table_name}}');
$model->id = $id;
$model->name = 'zhangxugg@163.com';
$model->save();

update:

$model = DTable::model('{{table_name}}')
$model->name = 'zhangxugg@163.com'
$model->save();
$list = $model->findAll();
use non-default database connection :
DTable::$db = Yii::app()->getCompoments('db-extra');

tips : you must define the database connection informations in config/main.php

'components' => array(
   'db-extra' => array(
     'class' => 'CDbConnection',
     'connectionString' => 'mysql:host=localhost;dbname=cdcol;charset=utf8',
     'username' => 'root',
     'password' =>'',
     'tablePrefix' => '',
     'autoConnect' => false,
   ),
)

DTable source code :

class DTable extends CActiveRecord {
  private static $tableName ;
  public function __construct($table_name = '') {
    if($table_name === null) {
      parent::__construct(null);
    } else {
      self::$tableName = $table_name ;
      parent::__construct();
    }
  }
public static function model($table_name='')
{
  self::$tableName = $table_name ;
  return parent::model(__CLASS__);
}
public function tableName()
{
return self::$tableName;
}
}
*/

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更多关于Yii相关内容感兴趣的读者可查看本站专题:《Yii框架入门及常用技巧总结》、《php优秀开发框架总结》、《smarty模板入门基础教程》、《php日期与时间用法总结》、《php面向对象程序设计入门教程》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家基于Yii框架的PHP程序设计有所帮助。

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