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HomeBackend DevelopmentPHP TutorialZend Framework教程之Zend_Db_Table_Row用法实例分析_PHP

本文实例讲述了Zend Framework教程之Zend_Db_Table_Row用法。分享给大家供大家参考,具体如下:

1. 简介

Zend_Db_Table_Row是Zend Framework的行数据网关.通常来说,你不可以自己实例化Zend_Db_Table_Row, 而是通过调用Zend_Db_Table::find()方法或者Zend_Db_Table::fetchRow()方法将Zend_Db_Table_Row作为 结果数据返回过来.一旦你得到来一个Zend_Db_Table_Row对象,你可以修改记录值(体现为类的属性)然后 调用save()方法可以将更改保存到原表上.

2. 取回一条记录

首先,需要实例化一个Zend_Db_Table类.

<&#63;php
// 设置一个 adapter
require_once 'Zend/Db.php';
$params = array (
  'host'   => '127.0.0.1',
  'username' => 'malory',
  'password' => '******',
  'dbname'  => 'camelot'
);
$db = Zend_Db::factory('PDO_MYSQL', $params);
// 为所有的Zend_Db_Table对象设置默认adapter
require_once 'Zend/Db/Table.php';
Zend_Db_Table::setDefaultAdapter($db);
// 连接到数据库中的某一个表
class RoundTable extends Zend_Db_Table {}
$table = new RoundTable();
&#63;>

接下来,使用Zend_Db_Table::find()方法和主键进行查询,或者使 用Zend_Db_Table::fetchRow()方法查询.
得到的返回结果是一个Zend_Db_Table_Row 对象,该对象的属性名采用camelCaps的形式对应数据库中带下划线的表名.
如,表名 若为first_name,那么类中的改属性则为firstName.

<&#63;php
// 从表中取回的结果数据是一个Zend_Db_Table_Row对象
$row = $table->fetchRow('first_name = "Robin"');
//
// $row现在是一个带有多种公有属性的Zend_Db_Table_Row对象
// that map to table columns:
//
// $row->id = '3'
// $row->nobleTitle = 'Sir'
// $row->firstName = 'Robin'
// $row->favoriteColor = 'yellow'
//
&#63;>

3. 修改数据

修改行数据是一件很轻松的事情:只需要按照常规的方法修改类属性.然后调用save()方法 就将改变的结果保存到了数据表中.

<&#63;php
// 连接到数据库中的表
class RoundTable extends Zend_Db_Table {}
$table = new RoundTable();
// 从表中取回的结果数据是一个Zend_Db_Table_Row对象
$row = $table->fetchRow('first_name = "Robin"');
//
// $row现在是一个带有多种公有属性的Zend_Db_Table_Row对象
// that map to table columns:
//
// $row->id = '3'
// $row->nobleTitle = 'Sir'
// $row->firstName = 'Robin'
// $row->favoriteColor = 'yellow'
//
// 改变favorite color字段,并且将变动存储到数据表中.
$row->favoriteColor = 'blue';
$row->save();
&#63;>

但是,你不能够修改主键的值.假如你试图进行改操作, Zend_Db_Table_Row将抛出一个异常.

<&#63;php
// 连接到数据库中的表
class RoundTable extends Zend_Db_Table {}
$table = new RoundTable();
// fetch a record from the table as a Zend_Db_Table_Row object
$row = $table->fetchRow('first_name = "Robin"');
// 我们尝试修改主键值
try {
  $row->id = 5;
  echo "We should not see this message, as an exception was thrown.";
} catch (Zend_Db_Table_RowException $e) {
  echo $e->getMessage();
}
&#63;>

更多关于zend相关内容感兴趣的读者可查看本站专题:《Zend FrameWork框架入门教程》、《php优秀开发框架总结》、《Yii框架入门及常用技巧总结》、《ThinkPHP入门教程》、《php面向对象程序设计入门教程》、《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Zend Framework框架的PHP程序设计有所帮助。

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