問題描述

我正在編寫一個應(yīng)用程序，它需要在應(yīng)用程序?qū)觾?nèi)進(jìn)行主/從切換.就像現(xiàn)在一樣，我在創(chuàng)建映射器時實(shí)例化一個 Zend_Db_Table 對象，然后 setDefaultAdapter 到從屬設(shè)備.

I am writing an application which requires the Master/Slave switch to happen inside the application layer. As it is right now, I instantiate a Zend_Db_Table object on creation of the mapper, and then setDefaultAdapter to the slave.

現(xiàn)在在基本映射器類中，我有以下方法:

Now inside of the base mapper classe, I have the following method:

public function useWriteAdapter()
{
    if(Zend_Db_Table_Abstract::getDefaultAdapter() != $this->_writeDb)
    {
        Zend_Db_Table_Abstract::setDefaultAdapter($this->_writeDb);
        $this->_tableGateway = new Zend_Db_Table($this->_tableName);
    }
}

我需要對此進(jìn)行完整性檢查.我不認(rèn)為開銷太大，我只是懷疑一定有更好的方法.

I need a sanity check on this. I don't think the overhead is too much, I just suspect there must be a better way.

推薦答案

Zend_Db_Table_Row_Abstract 類型的對象會記住產(chǎn)生它的 Table 對象.但是您可以在調(diào)用 save() 之前更改關(guān)聯(lián)的 Table.

An object of type Zend_Db_Table_Row_Abstract remembers what Table object produced it. But you can change the associated Table before you call save().

$readDb = Zend_Db::factory(...);  // replica
$writeDb = Zend_Db::factory(...); // master
Zend_Db_Table::setDefaultAdapter($readDb);

$myReadTable = new MyTable(); // use default adapter
$myWriteTable = new MyTable($writeDb);

$row = $myTable->find(1234)->current();

$row->column1 = 'value';

$row->setTable($myWriteTable);

$row->save();

這篇關(guān)于Zend Framework應(yīng)用層的Master/Slave切換的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網(wǎng)！