$array = new ArrayObject();
class MyCollection extends ArrayObject{}
$collection = new MyCollection();
$collection[] = 'bar';

public function testAction()
{
    $collection_of_products = Mage::getModel('catalog/product')->getCollection();
    var_dump($collection_of_products->getFirstItem()->getData());
}

public function testAction()
{
    $collection_of_products = Mage::getModel('catalog/product')->getCollection();
    var_dump($collection_of_products->getSelect()); //might cause a segmentation fault
}

object(Varien_Db_Select)[94]
  protected '_bind' =>
    array
      empty
  protected '_adapter' =>
...

public function testAction()
{
    $collection_of_products = Mage::getModel('catalog/product')->getCollection();
    //var_dump($collection_of_products->getSelect()); //might cause a segmentation fault
    var_dump(
        (string) $collection_of_products->getSelect()
    );
}

'SELECT `e`.* FROM `catalog_product_entity` AS `e`'

string 'SELECT `e`.*, `price_index`.`price`, `price_index`.`final_price`, IF(`price_index`.`tier_price`, LEAST(`price_index`.`min_price`, `price_index`.`tier_price`), `price_index`.`min_price`) AS `minimal_price`, `price_index`.`min_price`, `price_index`.`max_price`, `price_index`.`tier_price` FROM `catalog_product_entity` AS `e`
INNER JOIN `catalog_product_index_price` AS `price_index` ON price_index.entity_id = e.entity_id AND price_index.website_id = '1' AND price_index.customer_group_id = 0'

$collection_of_products = Mage::getModel('catalog/product')
->getCollection()
->addAttributeToSelect('*');  //the asterisk is like a SQL SELECT *

//or just one
$collection_of_products = Mage::getModel('catalog/product')
->getCollection()
->addAttributeToSelect('meta_title');

//or just one
$collection_of_products = Mage::getModel('catalog/product')
->getCollection()
->addAttributeToSelect('meta_title')
->addAttributeToSelect('price');

$model = new Customer();
//SQL Calls being made to Populate the Object
echo 'Done'; //execution continues

$collection_of_products = Mage::getModel('catalog/product')
->getCollection();

$collection_of_products = Mage::getModel('catalog/product')
->getCollection();
$collection_of_products->addAttributeToSelect('meta_title');

public function testAction()
{
    $collection_of_products = Mage::getModel('catalog/product')
    ->getCollection();
    $collection_of_products->addFieldToFilter('sku','n2610');

    //another neat thing about collections is you can pass them into the count      //function.  More PHP5 powered goodness
    echo "Our collection now has " . count($collection_of_products) . ' item(s)';
    var_dump($collection_of_products->getFirstItem()->getData());
}

$collection_of_products->addFieldToFilter('sku','n2610');

WHERE sku = "n2610"

public function testAction()
{
    var_dump(
    (string)
    Mage::getModel('catalog/product')
    ->getCollection()
    ->addFieldToFilter('sku','n2610')
    ->getSelect());
}

SELECT `e`.* FROM `catalog_product_entity` AS `e` WHERE (e.sku = 'n2610')'

var_dump(
(string)
Mage::getModel('catalog/product')
->getCollection()
->addAttributeToSelect('*')
->addFieldToFilter('meta_title','my title')
->getSelect()
);

SELECT `e`.*, IF(_table_meta_title.value_id>0, _table_meta_title.value, _table_meta_title_default.value) AS `meta_title`
FROM `catalog_product_entity` AS `e`
INNER JOIN `catalog_product_entity_varchar` AS `_table_meta_title_default`
    ON (_table_meta_title_default.entity_id = e.entity_id) AND (_table_meta_title_default.attribute_id='103')
    AND _table_meta_title_default.store_id=0
LEFT JOIN `catalog_product_entity_varchar` AS `_table_meta_title`
    ON (_table_meta_title.entity_id = e.entity_id) AND (_table_meta_title.attribute_id='103')
    AND (_table_meta_title.store_id='1')
WHERE (IF(_table_meta_title.value_id>0, _table_meta_title.value, _table_meta_title_default.value) = 'my title')

public function testAction()
{
    var_dump(
    (string)
    Mage::getModel('catalog/product')
    ->getCollection()
    ->addFieldToFilter('sku',array('eq'=>'n2610'))
    ->getSelect()
    );
}

addFieldToFilter('sku',array('eq'=>'n2610'))

array("eq"=>'n2610')
WHERE (e.sku = 'n2610')

array("neq"=>'n2610')
WHERE (e.sku != 'n2610')

array("like"=>'n2610')
WHERE (e.sku like 'n2610')

array("nlike"=>'n2610')
WHERE (e.sku not like 'n2610')

array("is"=>'n2610')
WHERE (e.sku is 'n2610')

array("in"=>array('n2610'))
WHERE (e.sku in ('n2610'))

array("nin"=>array('n2610'))
WHERE (e.sku not in ('n2610'))

array("notnull"=>'n2610')
WHERE (e.sku is NOT NULL)

array("null"=>'n2610')
WHERE (e.sku is NULL)

array("gt"=>'n2610')
WHERE (e.sku > 'n2610')

array("lt"=>'n2610')
WHERE (e.sku < 'n2610')

array("gteq"=>'n2610')
WHERE (e.sku >= 'n2610')

array("moreq"=>'n2610') //a weird, second way to do greater than equal
WHERE (e.sku >= 'n2610')

array("lteq"=>'n2610')
WHERE (e.sku <= 'n2610')

array("finset"=>array('n2610'))
WHERE (find_in_set('n2610',e.sku))

array('from'=>'10','to'=>'20')
WHERE e.sku >= '10' and e.sku <= '20'

array("in"=>array('n2610','ABC123')
WHERE (e.sku in ('n2610','ABC123'))

array("notnull"=>'n2610')
WHERE (e.sku is NOT NULL)

public function testAction
{
        var_dump(
        (string)
        Mage::getModel('catalog/product')
        ->getCollection()
        ->addFieldToFilter('price',array('from'=>'10','to'=>'20'))
        ->getSelect()
        );
}

WHERE (_table_price.value >= '10' AND _table_price.value <= '20')

function testAction()
{
        echo(
        (string)
        Mage::getModel('catalog/product')
        ->getCollection()
        ->addFieldToFilter('sku',array('like'=>'a%'))
        ->addFieldToFilter('sku',array('like'=>'b%'))
        ->getSelect()
        );
}

WHERE (e.sku LIKE 'a%') AND (e.sku LIKE 'b%')

public function testAction()
{
        $filter_a = array('like'=>'a%');
        $filter_b = array('like'=>'b%');
}

public function testAction()
{
        $filter_a = array('like'=>'a%');
        $filter_b = array('like'=>'b%');
        echo(
        (string)
        Mage::getModel('catalog/product')
        ->getCollection()
        ->addFieldToFilter('sku',array($filter_a,$filter_b))
        ->getSelect()
        );
}

WHERE (((e.sku LIKE 'a%') OR (e.sku LIKE 'b%')))

app/
     code/
            core/
            community/
            local/
                    App/

app/
     code/
            core/
            community/
            local/
                    App/
                               Catalog/
                                          Block/
                                                 Breadcrumbs.php
                                          etc/
                                                 config.xml

< ?xml version="1.0"?>
<config>
     <modules>
        <App_Catalog>
            <active>true</active>
            <codePool>local</codePool>
        </App_Catalog>
     </modules>
</config>

<?xml version="1.0" encoding="UTF-8"?>
<config>
    <modules>
        <App_Catalog>
            <version>0.1.0</version>
        </App_Catalog>
    </modules>
    <global>
        <blocks>
            <catalog>
                <rewrite>
                        <breadcrumbs>App_Catalog_Block_Breadcrumbs</breadcrumbs>
                </rewrite>
            </catalog>
        </blocks>
    </global>
</config>

      <blocks>
          <catalog>
              <rewrite>
                      <category_view>App_Catalog_Block_Category_View</category_view>
              </rewrite>
          </catalog>
      </blocks>

App_Catalog_Block_Breadcrumbs → /app/code/local/App/Catalog/Block/Breadcrumbs.php
App_Catalog_Block_Category_View → /app/code/local/App/Catalog/Block/Category/View.php

/app/code/local/App/Shopping
/app/code/local/App/Shopping/etc
/app/code/local/App/Shopping/etc/config.xml
/app/code/local/App/Shopping/controllers
/app/code/local/App/Shopping/controllers/CartController.php

<?xml version="1.0"?>
<config>
	<modules>
		<App_Shopping>
			<version>0.1.0</version>
		</App_Shopping>
	</modules>
	<global>
		<!-- This rewrite rule could be added to the database instead -->
		<rewrite>
			<!-- This is an identifier for your rewrite that should be unique -->
			<!-- THIS IS THE CLASSNAME IN YOUR OWN CONTROLLER -->
			<App_Shopping_cart>
				<from><![CDATA[#^/checkout/cart/#]]></from>
				<!--
					- Shopping module matches the router frontname below - checkout_cart
					matches the path to your controller Considering the router below,
					"/shopping/cart/" will be "translated" to
					"/App/Shopping/controllers/CartController.php" (?)
				-->
				<to>/shopping/cart/</to>
			</App_Shopping_cart>
		</rewrite>
	</global>
	<!--
		If you want to overload an admin-controller this tag should be <admin>
		instead, or <adminhtml> if youre overloading such stuff (?)
	-->
	<frontend>
		<routers>
			<App_Shopping>
				<!-- should be set to "admin" when overloading admin stuff (?) -->
				<use>standard</use>
				<args>
					<module>App_Shopping</module>
					<!-- This is used when "catching" the rewrite above -->
					<frontName>shopping</frontName>
				</args>
			</App_Shopping>
		</routers>
	</frontend>
</config>

< ?php
# 控制器不会自动加载，所以我们需要包含文件，这里与区块(Block)不一样
require_once 'Mage/Checkout/controllers/CartController.php';
class App_Shopping_CartController extends Mage_Checkout_CartController
{
    #覆写indexAction方法
    public function indexAction()
    {
		# Just to make sure
		error_log('耶～成功重写购物车！');
		parent::indexAction();
    }
}

<?xml version="1.0"?>
<config>
     <modules>
        <App_Catalog>
            <active>true</active>
            <codePool>local</codePool>
        </App_Catalog>
        <App_Shopping>
            <active>true</active>
            <codePool>local</codePool>
        </App_Shopping>
     </modules>
</config>

	<app_shopping_cart_index>
		<update handle="checkout_cart_index"/>
	</app_shopping_cart_index>

<from>< ![CDATA[#^/checkout/cart/#]]></from>

require_once 'Mage/Catalog/controllers/ProductController.php';

/**
 * Product controller
 *
 * @category   Mage
 * @package    Mage_Catalog
 */
class App_Catalog_ProductController extends Mage_Catalog_ProductController
{
    /**
     * View product action
     */
    public function viewAction()
    {
    	echo '覆盖过的....';
        parent::viewAction();
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<config>
    <modules>
        <App_Catalog>
            <version>0.1.0</version>
        </App_Catalog>
    </modules>
    <global>
		<!-- This rewrite rule could be added to the database instead -->
		<rewrite>
			<!-- This is an identifier for your rewrite that should be unique -->
			<!-- THIS IS THE CLASSNAME IN YOUR OWN CONTROLLER -->
			<App_Shopping_cart>
				<from><![CDATA[#^/catalog/product/#]]></from>
				<!--
					- Shopping module matches the router frontname below - checkout_cart
					matches the path to your controller Considering the router below,
					"/shopping/cart/" will be "translated" to
					"/App/Shopping/controllers/CartController.php" (?)
				-->
				<to>/catalog/product/</to>
			</App_Shopping_cart>
		</rewrite>
        <blocks>
            <catalog>
                <rewrite>
                        <breadcrumbs>App_Catalog_Block_Breadcrumbs</breadcrumbs>
                </rewrite>
            </catalog>
        </blocks>
    </global>
	<frontend>
        <routers>
            <catalog>
                <use>standard</use>
                <args>
                    <module>App_Catalog</module>
                    <frontName>catalog</frontName>
                </args>
            </catalog>
        </routers>
	</frontend>
</config>

<?xml version="1.0"?>
<config>
     <modules>
        <App_Mycms>
            <version>0.1.0</version>
        </App_Mycms>
    </modules>
    <frontend>
        <routers>
            <mycms>
                <use>standard</use>
                <args>
                    <module>App_Mycms</module>
                    <frontName>mycms</frontName>
                </args>
            </mycms>
        </routers>
    </frontend>
    <global>
        <routers>
            <cms>
                <rewrite>
                    <index>
                        <to>App_Mycms/index</to>
                        <override_actions>true</override_actions>
                        <actions>
                           <noroute><to>App_Mycms/index/noroute</to></noroute>
                        </actions>
                    </index>
                </rewrite>
            </cms>
        </routers>
    </global>
</config>

app/code/local/App/Customer
app/code/local/App/Customer/etc/config.xml
app/code/local/App/Customer/Model
app/code/local/App/Customer/Model/Customer.php

        <App_Customer>
            <active>true</active>
            <codePool>local</codePool>
        </App_Customer>

<?xml version="1.0" encoding="UTF-8"?>
<config>
	<modules>
		<App_Customer>
			<version>0.1.0</version>
		</App_Customer>
	</modules>

	<global>
		<models>
			<customer>
				<rewrite>
					<customer>App_Customer_Model_Customer</customer>
				</rewrite>
			</customer>
		</models>
	</global>
</config>

class App_Customer_Model_Customer extends Mage_Customer_Model_Customer {
	// 重写已存在的方法
	public function validate() {
		// Define new validate rules. From now magento call this validate method instead of existing method
		//return $errors;
		return true;
	}

	// 你还可以创建新的方法
	public function newMethod() {
		// function logic
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<config>
	<modules>
		<App_Customer>
			<version>0.1.0</version>
		</App_Customer>
	</modules>

	<global>
		<models>
			<customer>
				<rewrite>
					<customer>App_Customer_Model_Customer</customer>
					<address>App_Customer_Model_Address</address>
				</rewrite>
			</customer>
		</models>
	</global>
</config>

class App_Customer_Model_Address extends Mage_Customer_Model_Address {
	// 重写已存在的方法
	public function validate() {
		// Define new validate rules. From now magento call this validate method instead of existing method
		//return $errors;
		return true;
	}

	// 你还可以创建新的方法
	public function newMethod() {
		// function logic
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<config>
	<modules>
		<App_Customer>
			<version>0.1.0</version>
		</App_Customer>
	</modules>

	<global>
		<models>
			<customer>
				<rewrite>
					<customer>App_Customer_Model_Customer</customer>
					<address>App_Customer_Model_Address</address>
				</rewrite>
			</customer>
			<customer_entity>
				<rewrite>
					<address>App_Customer_Model_Entity_Address</address>
				</rewrite>
			</customer_entity>
		</models>
	</global>
</config>

class App_Customer_Model_Entity_Address extends Mage_Customer_Model_Entity_Address {
	protected function _afterSave(Varien_Object $address) {
		// Write your code
	}
}

app/code/local/Zhlmmc/Helloworld/etc/system.xml

//header('Content-Type: text/xml');
	header('Content-Type: text/plain');
	echo $config = Mage::getConfig()
	->loadModulesConfiguration('system.xml')
	->getNode()
	->asXML();
	exit;

Location: app/code/local/Zhlmmc/Helloworld/etc/system.xml
	<config>
	    <tabs>
	        <helloconfig translate="label" module="helloworld">
	            <label>Hello Config</label>
	            <sort_order>99999</sort_order>
	        </helloconfig>
	    </tabs>
	</config>

Fatal error: Class 'Mage_Helloworld_Helper_Data' not found in….

File: app/code/local/Zhlmmc/Helloworld/etc/config.xml
	< !– … –>
	<global>
	    < !– … –>
	    <helpers>
	        <helloworld>
	            <class>Zhlmmc_Helloworld_Helper</class>
	        </helloworld>
	    </helpers>
	    < !– … –>
	</global>
	< !– … –>

Packagename_Modulename_Helper

Mage::helper('helloworld/foo')

app/code/local/Zhlmmc/Helper/Foo.php
	class Zhlmmc_Helloworld_Helper_Foo

Mage::helper('helloworld');
	Mage::helper('helloworld/data');

app/code/local/Zhlmmc/Helper/Data.php
	class Zhlmmc_Helloworld_Helper_Data

File: app/code/local/Zhlmmc/Helper/Data.php
	class Zhlmmc_Helloworld_Helper_Data extends Mage_Core_Helper_Abstract
	{
	}

Location: app/code/local/Zhlmmc/Helloworld/etc/system.xml
	<config>
	    <tabs>
	        <helloconfig translate="label" module="helloworld">
	            <label>Hello Config</label>
	            <sort_order>99999</sort_order>
	        </helloconfig>
	    </tabs>
	    <sections>
	        <helloworld_options translate="label" module="helloworld">
	            <label>Hello World Config Options</label>
	            <tab>helloconfig</tab>
	            <frontend_type>text</frontend_type>
	            <sort_order>1000</sort_order>
	            <show_in_default>1</show_in_default>
	            <show_in_website>1</show_in_website>
	            <show_in_store>1</show_in_store>
	        </helloworld_options>
	    </sections>
	</config>

admin/system/config/web

admin/system/config/helloworld_options

File: app/code/local/Zhlmmc/Helloworld/etc/config.xml
	<config>
	    < !– … –>
	    <adminhtml>
	        <acl>
	            <resources>
	                <admin>
	                    <children>
	                        <system>
	                            <children>
	                                <config>
	                                    <children>
	                                        <helloworld_options>
	                                            <title>Store Hello World Module Section</title>
	                                        </helloworld_options>
	                                    </children>
	                                </config>
	                            </children>
	                        </system>
	                    </children>
	                </admin>
	            </resources>
	        </acl>
	    </adminhtml>
	    < !– … –>
	</config>

<adminhtml>
	    <acl>
	        <resources>

	    </resources></acl>
	</adminhtml>

<admin>
	    <children>
	        <system>
	            <children></children></system></children></admin>

admin/system

<helloworld_options>
	    <title>Store Hello World Module Section</title>
	</helloworld_options>

Location: app/code/local/Zhlmmc/Helloworld/etc/system.xml
	<config>
	    <tabs>
	        <helloconfig translate="label" module="helloworld">
	            <label>Hello Config</label>
	            <sort_order>99999</sort_order>
	        </helloconfig>
	    </tabs>
	    <sections>
	        <helloworld_options translate="label" module="helloworld">
	            <label>Hello World Config Options</label>
	            <tab>helloconfig</tab>
	            <frontend_type>text</frontend_type>
	            <sort_order>1000</sort_order>
	            <show_in_default>1</show_in_default>
	            <show_in_website>1</show_in_website>
	            <show_in_store>1</show_in_store>
	            <groups>
	                <messages translate="label">
	                    <label>Demo Of Config Fields</label>
	                    <frontend_type>text</frontend_type>
	                    <sort_order>1</sort_order>
	                    <show_in_default>1</show_in_default>
	                    <show_in_website>1</show_in_website>
	                    <show_in_store>1</show_in_store>
	                </messages>
	            </groups>
	        </helloworld_options>
	    </sections>
	</config>

< !– … –>
	<messages translate="label">
	    <label>Demo Of Config Fields</label>
	    <frontend_type>text</frontend_type>
	    <sort_order>1</sort_order>
	    <show_in_default>1</show_in_default>
	    <show_in_website>1</show_in_website>
	    <show_in_store>1</show_in_store>
	    <fields>
	        <hello_message>
	            <label>Message</label>
	            <frontend_type>text</frontend_type>
	            <sort_order>1</sort_order>
	            <show_in_default>1</show_in_default>
	            <show_in_website>1</show_in_website>
	            <show_in_store>1</show_in_store>
	        </hello_message>
	    </fields>
	</messages>
	< !– … –>

<hello_message>
	    <label>Message</label>
	    <frontend_type>select</frontend_type>
	    < !– adding a source model –>
	    <source_model>helloworld/words</source_model>
	    <sort_order>1</sort_order>
	    <show_in_default>1</show_in_default>
	    <show_in_website>1</show_in_website>
	    <show_in_store>1</show_in_store>
	</hello_message>

File: app/code/local/Zhlmmc/Helloworld/Model/Words.php
	class Zhlmmc_Helloworld_Model_Words
	{
	    public function toOptionArray()
	    {
	        return array(
	            array('value'=>1, 'label'=>Mage::helper('helloworld')->__('Hello')),
	            array('value'=>2, 'label'=>Mage::helper('helloworld')->__('Goodbye')),
	            array('value'=>3, 'label'=>Mage::helper('helloworld')->__('Yes')),
	            array('value'=>4, 'label'=>Mage::helper('helloworld')->__('No')),
	        );
	    }
	}

app/code/core/Mage/Adminhtml/Block/System/Config/Form.php

File: app/code/local/Zhlmmc/Helloworld/etc/system.xml
	<config>
	    < !– … –>
	    <sections>
	        < !– … –>
	        <general>
	            <groups>
	                <example>
	                    <label>Example of Adding a Group</label>
	                    <frontend_type>text</frontend_type>
	                    <sort_order>1</sort_order>
	                    <show_in_default>1</show_in_default>
	                    <show_in_website>1</show_in_website>
	                    <show_in_store>1</show_in_store>
	                </example>
	            </groups>
	        </general>
	        < !– … –>

	</sections></config>

Mage::getStoreConfig('helloworld_options/messages/hello_message');

section_name/group_name/field_name

Mage::getStoreConfig('helloworld_options/messages');
	Mage::getStoreConfig('helloworld_options');

Mage::getStoreConfig('helloworld_options',1);

+——————+
	| products         |
	+——————+
	| product_id       |
	| name             |
	| price            |
	| etc..            |
	+——————+
	+————+—————-+——————+———+
	| product_id | name           | price            | etc…  |
	+————+—————-+——————+———+
	| 1          | Widget A       | 11.34            | etc…  |
	+————+—————-+——————+———+
	| 2          | Dongle B       | 6.34             | etc…  |
	+————+—————-+——————+———+

	<global>
	    < !– … –>
	    <models>
	        < !– … –>
	        <helloworld-eav>
	           <class>Wemvc_Helloworld_Model</class>
	           <resourceModel>helloworld-eav_mysql4</resourceModel>
	        </helloworld-eav>
	        < !– … –>
	    </models>
	    < !– … –>
	</global>

public function eavReadAction(){
	    $eavModel = Mage::getModel('helloworld/eavblogpost');
	    echo get_class($eavModel)."<br />";
	}

http://127.0.0.1/Magento/helloworld/blog/eavRead

Warning: include(Wemvc/Helloworld/Model/Eavblogpost.php) [function.include]: failed to open stream: No such file or directory

File: app/code/local/Wemvc/Helloworld/Model/Eavblogpost.php
	class Wemvc_Helloworld_Model_Eavblogpost extends Mage_Core_Model_Abstract
	{
	    protected function _construct()
	    {
	        $this->_init('helloworld-eav/blogpost');
	    }
	}

Wemvc_Helloworld_Model_Eavblogpost

	        <helloworld-eav_mysql4>
			    <class>Wemvc_Helloworld_Model_Resource_Eav_Mysql4</class>
			    <entities>
			        <blogpost>
			            <table>eavblog_posts</table>
			        </blogpost>
			    </entities>
	        </helloworld-eav_mysql4>

<resources>
	    < !– … ->
		    <helloworld-eav_write>
		        <connection>
		            <use>default_write</use>
		        </connection>
		    </helloworld-eav_write>
		    <helloworld-eav_read>
		        <connection>
		            <use>default_read</use>
		        </connection>
		    </helloworld-eav_read>
	</resources>

public function eavReadAction(){
	    $eavModel = Mage::getModel('helloworld-eav/eavblogpost');
	    $params = $this->getRequest()->getParams();
	    echo("Loading the blogpost with an ID of ".$params['id']."<br />");
	    $eavModel->load($params['id']);
	    $data = $eavModel->getData();
	    var_dump($data);
	}

http://127.0.0.1/Magento/helloworld/blog/eavRead/id/1

Warning: include(Wemvc/Helloworld/Model/Resource/Eav/Mysql4/Blogpost.php) [function.include]: failed to open stream: No such file or directory

File: app/code/local/Wemvc/Helloworld/Model/Resource/Eav/Mysql4/Blogpost.php
	class Wemvc_Helloworld_Model_Resource_Eav_Mysql4_Blogpost extends Mage_Eav_Model_Entity_Abstract
	{
	    public function _construct()
	    {
	        $resource = Mage::getSingleton('core/resource');
	        $this->setType('helloworld_eavblogpost');
	        $this->setConnection(
	            $resource->getConnection('helloworld-eav_read'),
	            $resource->getConnection('helloworld-eav_write')
	             );
	    }
	}

Invalid entity_type specified: helloworld_eavblogpost

mysql> select * from eav_entity_type\G
	*************************** 1. row ***************************
	             entity_type_id: 1
	           entity_type_code: customer
	               entity_model: customer/customer
	            attribute_model:
	               entity_table: customer/entity
	         value_table_prefix:
	            entity_id_field:
	            is_data_sharing: 1
	           data_sharing_key: default
	   default_attribute_set_id: 1
	            increment_model: eav/entity_increment_numeric
	        increment_per_store: 0
	       increment_pad_length: 8
	         increment_pad_char: 0
	 additional_attribute_table: customer/eav_attribute
	entity_attribute_collection: customer/attribute_collection
	*************************** 2. row ***************************
	             entity_type_id: 2
	           entity_type_code: customer_address
	               entity_model: customer/customer_address
	            attribute_model:
	               entity_table: customer/address_entity
	         value_table_prefix:
	            entity_id_field:
	            is_data_sharing: 1
	           data_sharing_key: default
	   default_attribute_set_id: 2
	            increment_model:
	        increment_per_store: 0
	       increment_pad_length: 8
	         increment_pad_char: 0
	 additional_attribute_table: customer/eav_attribute
	entity_attribute_collection: customer/attribute_collection

<resources>
	  < !– … –>
		    <helloworld-eav_setup>
		        <setup>
		            <module>Wemvc_Helloworld</module>
		            <class>Wemvc_Helloworld_Model_Entity_Setup</class>
		        </setup>
		        <connection>
		            <use>core_setup</use>
		        </connection>
		    </helloworld-eav_setup>
	  < !– … –>
	</resources>

File: app/code/local/Wemvc/Helloworld/Model/Entity/Setup.php
	class Wemvc_Helloworld_Model_Entity_Setup extends Mage_Eav_Model_Entity_Setup {
	}

File: app/code/local/Wemvc/Helloworld/sql/helloworld-eav_setup/mysql4-install-0.1.0.php
	< ?php
	$installer = $this;
	throw new Exception("This is an exception to stop the installer from completing");
	?>

$installer = $this;
	$installer->addEntityType('helloworld_eavblogpost',Array(
	//entity_mode is the URL you'd pass into a Mage::getModel() call
	'entity_model'          =>'helloworld-eav/eavblogpost',
	//blank for now
	'attribute_model'       =>'',
	//table refers to the resource URI helloworld-eav/blogpost
	//<helloworld -eav_mysql4>…<blogpost><table>eavblog_posts</table>
	'table'         =>'helloworld-eav/blogpost',
	//blank for now, but can also be eav/entity_increment_numeric
	'increment_model'       =>'',
	//appears that this needs to be/can be above "1" if we're using eav/entity_increment_numeric
	'increment_per_store'   =>'0'
	));

http://127.0.0.1/Magento/helloworld/blog/eavRead/id/1

SQLSTATE[42S02]: Base table or view not found: 1146 Table 'eavblog_posts' doesn't exist

$installer->createEntityTables(
	    $this->getTable('helloworld-eav/blogpost')
	);

eavblog_posts
	eavblog_posts_datetime
	eavblog_posts_decimal
	eavblog_posts_int
	eavblog_posts_text
	eavblog_posts_varchar

mysql> select * from eav_attribute_set order by attribute_set_id DESC LIMIT 1 \G
	*************************** 1. row ***************************
	  attribute_set_id: 63
	    entity_type_id: 31
	attribute_set_name: Default
	        sort_order: 3

http://127.0.0.1/Magento/helloworld/blog/eavRead/id/1

Loading the blogpost with an ID of 1
	array(0) { }

class Wemvc_Helloworld_Model_Setup_Entity_Setup extends Mage_Eav_Model_Entity_Setup {
<?php
class Wemvc_Helloworld_Model_Entity_Setup extends Mage_Eav_Model_Entity_Setup {
    public function getDefaultEntities()
    {
        return array (
            'helloworld_eavblogpost' => array(
                'entity_model'      => 'helloworld-eav/eavblogpost',
                'attribute_model'   => '',
                'table'             => 'helloworld-eav/blogpost',
                'attributes'        => array(
                    'title' => array(
                        //the EAV attribute type, NOT a mysql varchar
                        'type'              => 'varchar',
                        'backend'           => '',
                        'frontend'          => '',
                        'label'             => 'Title',
                        'input'             => 'text',
                        'class'             => '',
                        'source'            => '',
                        // store scope == 0
                        // global scope == 1
                        // website scope == 2
                        'global'            => 0,
                        'visible'           => true,
                        'required'          => true,
                        'user_defined'      => true,
                        'default'           => '',
                        'searchable'        => false,
                        'filterable'        => false,
                        'comparable'        => false,
                        'visible_on_front'  => false,
                        'unique'            => false,
                    ),
                    'post' => array(
                        //the EAV attribute type, NOT a mysql varchar
                        'type'              => 'text',
                        'backend'           => '',
                        'frontend'          => '',
                        'label'             => 'Post',
                        'input'             => 'text',
                        'class'             => '',
                        'source'            => '',
                        // store scope == 0
                        // global scope == 1
                        // website scope == 2
                        'global'            => 0,
                        'visible'           => true,
                        'required'          => true,
                        'user_defined'      => true,
                        'default'           => '',
                        'searchable'        => false,
                        'filterable'        => false,
                        'comparable'        => false,
                        'visible_on_front'  => false,
                        'unique'            => false,
                    ),
                ),
            )
        );
    }
}

$installer->installEntities();

SQLSTATE[23000]: Integrity constraint violation: 1217 Cannot delete or update a parent row: a foreign key constraint fails

public function eavPopulateEntriesAction() {
	    for($i=0;$i<10;$i++) {
	        $weblog2 = Mage::getModel('helloworld-eav/eavblogpost');
	        $weblog2->setTitle('This is a test '.$i);
	        $weblog2->save();
	    }
	    echo 'Done';
	}
	public function eavShowcollectionAction() {
	    $weblog2 = Mage::getModel('helloworld-eav/eavblogpost');
	    $entries = $weblog2->getCollection()->addAttributeToSelect('title');
	    $entries->load();
	    foreach($entries as $entry)
	    {
	        // var_dump($entry->getData());
	        echo '<h1>'.$entry->getTitle().'</h1>';
	    }
	    echo '<br />Done<br />';
	}

class Wemvc_Helloworld_Model_Resource_Eav_Mysql4_Blogpost_Collection extends Mage_Eav_Model_Entity_Collection_Abstract
	{
	    protected function _construct()
	    {
	        $this->_init('helloworld-eav/eavblogpost', 'helloworld-eav/blogpost');
	    }
	}

http://127.0.0.1/Magento/helloworld/blog/eavPopulateEntries

if (is_null($resourceModel)) {
	    $resourceModel = $model;
	}

<resources>
    <!-- ... -->
    <helloworld_setup>
        <setup>
            <module>Zhlmmc_Helloworld</module>
            <class>Zhlmmc_Helloworld_Model_Setup_Mysql4_Setup</class>
        </setup>
        <connection>
            <use>core_setup</use>
        </connection>
    </helloworld_setup>
    <!-- ... -->
</resources>

<modules>
    <zhlmmc_helloworld>
        <version>0.1.0</version>
    </zhlmmc_helloworld>
</modules>

echo 'Running This Upgrade: '.get_class($this)."\n   \n";
die("Exit for now");

mysql> select code,version from core_resource;
	+————————-+————+
	| code                    | version    |
	+————————-+————+
	| adminnotification_setup | 1.0.0      |
	| admin_setup             | 0.7.2      |
	| alipay_setup            | 0.9.0      |
	| api_setup               | 0.8.1      |
	| backup_setup            | 0.7.0      |
	| bundle_setup            | 0.1.11     |
	| canonicalurl_setup      | 0.1.0      |
	| catalogindex_setup      | 0.7.10     |
	| cataloginventory_setup  | 0.7.5      |
	| catalogrule_setup       | 0.7.8      |
	| catalogsearch_setup     | 0.7.7      |
	| catalog_setup           | 1.4.0.0.21 |
	| checkout_setup          | 0.9.5      |
	| chronopay_setup         | 0.1.0      |
	| cms_setup               | 0.7.13     |
	| compiler_setup          | 0.1.0      |
	| contacts_setup          | 0.8.0      |
	| core_setup              | 0.8.26     |
	| cron_setup              | 0.7.1      |
	| customer_setup          | 1.4.0.0.6  |
	| cybermut_setup          | 0.1.0      |
	| cybersource_setup       | 0.7.0      |
	| dataflow_setup          | 0.7.4      |
	| directory_setup         | 0.8.10     |
	| downloadable_setup      | 0.1.16     |
	| eav_setup               | 0.7.15     |
	| eway_setup              | 0.1.0      |
	| flo2cash_setup          | 0.1.1      |
	| giftmessage_setup       | 0.7.2      |
	| googleanalytics_setup   | 0.1.0      |
	| googlebase_setup        | 0.1.1      |
	| googlecheckout_setup    | 0.7.3      |
	| googleoptimizer_setup   | 0.1.2      |
	| helloworld_setup        | 0.1.0      |
	| ideal_setup             | 0.1.0      |
	| index_setup             | 1.4.0.2    |
	| log_setup               | 0.7.7      |
	| moneybookers_setup      | 1.2        |
	| newsletter_setup        | 0.8.2      |
	| oscommerce_setup        | 0.8.10     |
	| paybox_setup            | 0.1.3      |
	| paygate_setup           | 0.7.1      |
	| payment_setup           | 0.7.0      |
	| paypaluk_setup          | 0.7.0      |
	| paypal_setup            | 0.7.4      |
	| poll_setup              | 0.7.2      |
	| productalert_setup      | 0.7.2      |
	| protx_setup             | 0.1.0      |
	| rating_setup            | 0.7.2      |
	| reports_setup           | 0.7.10     |
	| review_setup            | 0.7.6      |
	| salesrule_setup         | 0.7.12     |
	| sales_setup             | 0.9.56     |
	| sendfriend_setup        | 0.7.4      |
	| shipping_setup          | 0.7.0      |
	| sitemap_setup           | 0.7.2      |
	| strikeiron_setup        | 0.9.1      |
	| tag_setup               | 0.7.5      |
	| tax_setup               | 0.7.11     |
	| usa_setup               | 0.7.1      |
	| weee_setup              | 0.13       |
	| widget_setup            | 1.4.0.0.0  |
	| wishlist_setup          | 0.7.7      |
	+————————-+————+
	63 rows in set (0.00 sec)

DELETE from core_resource where code = 'helloworld_setup';

DROP TABLE blog_posts;

$installer = $this;
	$installer->startSetup();
	$installer->run("
	    CREATE TABLE `{$installer->getTable('helloworld/blogpost')}` (
	      `blogpost_id` int(11) NOT NULL auto_increment,
	      `title` text,
	      `post` text,
	      `date` datetime default NULL,
	      `timestamp` timestamp NOT NULL default CURRENT_TIMESTAMP,
	      PRIMARY KEY  (`blogpost_id`)
	    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
	    INSERT INTO `{$installer->getTable('helloworld/blogpost')}` VALUES (1,'My New Title','This is a blog post','2009-07-01 00:00:00','2009-07-02 23:12:30');
	");
	$installer->endSetup();

$installer = $this;

$installer->startSetup();
	//…
	$installer->endSetup();

public function startSetup()
	{
	    $this->_conn->multi_query("SET SQL_MODE='';
	SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
	SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO';
	");
	    return $this;
	}
	public function endSetup()
	{
	    $this->_conn->multi_query("
	SET SQL_MODE=IFNULL(@OLD_SQL_MODE,'');
	SET FOREIGN_KEY_CHECKS=IFNULL(@OLD_FOREIGN_KEY_CHECKS,0);
	");
	    return $this;
	}

$installer->run(…);

$installer->getTable('helloworld/blogpost')

<helloworld_mysql4>
	   <class>Zhlmmc_Helloworld_Model_Resource_Mysql4</class>
	   <entities>
	       <blogpost>
	           <table>blog_posts</table>
	       </blogpost>
	   </entities>
	</helloworld_mysql4>

File: app/code/local/Zhlmmc/Helloworld/sql/helloworld_setup/mysql4-upgrade-0.1.0-0.2.0.php
	echo 'Testing our upgrade script (mysql4-upgrade-0.1.0-0.2.0.php) and halting execution to avoid updating the system version number  ';
	die();

<modules>
	    <zhlmmc_helloworld>
	        <version>0.2.0</version>
	    </zhlmmc_helloworld>
	</modules>

$installer = $this;
	$installer->startSetup();
	$installer->run("
	    ALTER TABLE `{$installer->getTable('helloworld/blogpost')}`
	    CHANGE post post text not null;
	");
	$installer->endSetup();

class App_Helloworld_BlogController extends Mage_Core_Controller_Front_Action {
    public function indexAction()
    {
        echo 'Hello Blog';
    }
}

http://127.0.0.1/Magento/helloworld/blog

CREATE TABLE `blog_posts` (
    `blogpost_id` int(11) NOT NULL AUTO_INCREMENT,
    `title` text,
    `post` text,
    `date` datetime DEFAULT NULL,
    `timestamp` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY  (`blogpost_id`)
);

INSERT INTO `blog_posts` VALUES (1,'My New Title','This is a blog post','2009-07-01 00:00:00','2009-07-02 23:12:30');

$model = Mage::getModel('helloworld/blogpost');

<global>
<!-- ... -->
<models>
    <helloworld>
        <class>App_Helloworld_Model</class>
        <!--
            need to create our own resource, can't just
            use core_mysql4
            -->
        <resourceModel>helloworld_mysql4</resourceModel>
    </helloworld>
    </models>
    <!-- ... -->
</global>

Packagename_Modulename_Model

public function indexAction() {
    $blogpost = Mage::getModel('helloworld/blogpost');
    echo get_class($blogpost);
}

include(App\Helloworld\Model\Blogpost.php) [<a href='function.include'>function.include</a>]: failed to open stream: No such file or directory

        File: app/code/local/App/Helloworld/Model/Blogpost.php
	class App_Helloworld_Model_Blogpost extends Mage_Core_Model_Abstract
	{
	    protected function _construct()
	    {
	        $this->_init('helloworld/blogpost');
	    }
	}

<resourcemodel>helloworld_mysql4</resourcemodel>

Mage::getResourceModel('helloworld/blogpost');

<global>
<!-- ... -->
<models>
<!-- ... -->
<helloworld_mysql4>
    <class>App_Helloworld_Model_Resource_Mysql4</class>
</helloworld_mysql4>
</models>
</global>

Packagename_Modulename_Model_Resource_Mysql4

        public function indexAction() {
	    $params = $this->getRequest()->getParams();
	    $blogpost = Mage::getModel('helloworld/blogpost');
	    echo("Loading the blogpost with an ID of ".$params['id']."<br />");
	    $blogpost->load($params['id']);
	    $data = $blogpost->getData();
	    var_dump($data);
	}

http://127.0.0.1/Magento/helloworld/blog/index/id/1

include(App\Helloworld\Model\Resource\Mysql4\Blogpost.php) [function.include]: failed to open stream: No such file or directory

File: app/code/local/App/Helloworld/Model/Resource/Mysql4/Blogpost.php
	class App_Helloworld_Model_Resource_Mysql4_Blogpost extends Mage_Core_Model_Mysql4_Abstract{
	    protected function _construct()
	    {
	        $this->_init('helloworld/blogpost', 'blogpost_id');
	    }
	}

Can't retrieve entity config: helloworld/blogpost

<global>
	<!-- ... -->
	<models>
	    <!-- ... -->
	    <helloworld_mysql4>
	       <class>App_Helloworld_Model_Resource_Mysql4</class>
	       <entities>
	           <blogpost>
	               <table>blog_posts</table>
	           </blogpost>
	       </entities>
	    </helloworld_mysql4>
	</models>
</global>

Loading the blogpost with an ID of 1
	array(5) { ["blogpost_id"]=> string(1) "1" ["title"]=> string(12) "My New Title" ["post"]=> string(19) "This is a blog post" ["date"]=> string(19) "2009-07-01 00:00:00" ["timestamp"]=> string(19) "2009-07-02 23:12:30" }

<global>
	<!-- ... -->
	<resources>
	    <helloworld_write>
	        <connection>
	            <use>default_write</use>
	        </connection>
	    </helloworld_write>
	    <helloworld_read>
	        <connection>
	            <use>default_read</use>
	        </connection>
	    </helloworld_read>
	</resources>
</global>

<default_setup>
	<connection>
	    <model>mysql4</model>
	    <initstatements>SET NAMES utf8</initstatements>
	    <type>pdo_mysql</type>
	    <host>localhost</host>
	    <username>root</username>
	    <password>admin</password>
	    <dbname>zend-magento</dbname>
	    <active>1</active>
	</connection>
</default_setup>

<resource>
	<connection>
	    <types>
	        <pdo_mysql>
	            <class>Mage_Core_Model_Resource_Type_Db_Pdo_Mysql</class>
	        </pdo_mysql>
	    </types>
	</connection>
</resource>

lib/Varien/Object.php

$model->getData();
	$model->getData('title');

$model->getOrigData();
	$model->getOrigData('title');

$model->getBlogpostId();
	$model->setBlogpostId(25);
	$model->unsetBlogpostId();
	if($model->hasBlogpostId()){...}

$id = $model->['blogpost_id'];
	$model->['blogpost_id'] = 25;
	 //etc...

$blogpost->load(1);

public function createNewPostAction() {
	    $blogpost = Mage::getModel('helloworld/blogpost');
	    $blogpost->setTitle('Code Post!');
	    $blogpost->setPost('This post was created from code!');
	    $blogpost->save();
	    echo 'post created';
	}

http://127.0.0.1/Magento/helloworld/blog/createNewPost

	public function editFirstPostAction() {
	    $blogpost = Mage::getModel('helloworld/blogpost');
	    $blogpost->load(1);
	    $blogpost->setTitle("The First post!");
	    $blogpost->save();
	    echo 'post edited';
	}

        public function deleteFirstPostAction() {
	    $blogpost = Mage::getModel('helloworld/blogpost');
	    $blogpost->load(1);
	    $blogpost->delete();
	    echo 'post removed';
	}

	public function showAllBlogPostsAction() {
	    $posts = Mage::getModel('helloworld/blogpost')->getCollection();
	    foreach($posts as $blog_post){
	        echo '<h3>'.$blog_post->getTitle().'</h3>';
	        echo nl2br($blog_post->getPost());
	    }
	}

http://127.0.0.1/Magento/helloworld/blog/showAllBlogPosts

include(App\Helloworld\Model\Resource\Mysql4\Blogpost\Collection.php) [function.include]: failed to open stream: No such file or directory

protected '_resourceCollectionName' => string 'helloworld/blogpost_collection'

App_Helloworld_Model_Resource_Mysql4_Blogpost_Collection

File: app/code/local/App/Helloworld/Model/Resource/Mysql4/Blogpost/Collection.php
class App_Helloworld_Model_Resource_Mysql4_Blogpost_Collection extends Mage_Core_Model_Mysql4_Collection_Abstract {
    protected function _construct()
    {
            $this->_init('helloworld/blogpost');
    }
}

File: app/design/frontend/base/default/template/catalog/product/list.phtml

<?php $_productCollection=$this->getLoadedProductCollection() ?>
<?php if(!$_productCollection->count()): ?>
<p><?php echo $this->__('There are no products matching the selection.') ?></p>
<?php else: ?>

File: app/code/core/Mage/Catalog/Block/Product/List.php
...
public function getLoadedProductCollection()
{
    return $this->_getProductCollection();
}
...

File: app/design/frontend/base/default/template/page/1column.phtm

<?php
/**
 * Template for Mage_Page_Block_Html
 */
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="<?php echo $this->getLang() ?>" lang="<?php echo $this->getLang() ?>">
<head>
<?php echo $this->getChildHtml('head') ?>
</head>
<body<?php echo $this->getBodyClass()?'color: #339933;">.$this->getBodyClass().'"':'' ?>>
<?php echo $this->getChildHtml('after_body_start') ?>
<div>
    <?php echo $this->getChildHtml('global_notices') ?>
    <div>
        <?php echo $this->getChildHtml('header') ?>
        <div>
            <div>
                <?php echo $this->getChildHtml('breadcrumbs') ?>
                <div>
                    <?php echo $this->getChildHtml('global_messages') ?>
                    <?php echo $this->getChildHtml('content') ?>
                </div>
            </div>
        </div>
        <?php echo $this->getChildHtml('footer') ?>
        <?php echo $this->getChildHtml('before_body_end') ?>
    </div>
</div>
<?php echo $this->getAbsoluteFooter() ?>
</body>
</html>

app/design/frontend/default/default/layout/local.xml

<?xml version="1.0" encoding="UTF-8"?>
<layout version="0.1.0">
    <helloworld_index_index>
        <reference name="root">
            <block type="page/html" name="root" output="toHtml" template="helloworld/simple_page.phtml"/>
        </reference>
    </helloworld_index_index>
</layout>

app/design/frontend/default/default/template/helloworld/simple_page.phtml

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Untitled</title>
    <style type="text/css">
        body {
            background-color:#f00;
        }
    </style>
</head>
<body>
<h4>Links</h4>
<?php echo $this->getChildHtml('top.links'); ?>
<?php echo $this->getChildHtml('customer_form_register'); ?>
</body>
</html>

public function indexAction() {
    //remove our previous echo
    //echo 'Hello Index!';
    $this->loadLayout();
    $this->renderLayout();
}

http://example.com/helloworld/index/index?showLayout=page

File: app/code/core/Mage/Core/Model/Layout.php
public function getOutput()
{
    $out = '';
    if (!empty($this->_output)) {
        foreach ($this->_output as $callback) {
            $out .= $this->getBlock($callback[0])->$callback[1]();
        }
    }
    return $out;
}

<block type="page/html" ...
<block type="page/template_links"...

/global/blocks/page

<page>
    <class>
        Mage_Page_Block
    </class>
</page>

<block type="page/html" name="root" output="toHtml" template="page/2columns-left.phtml">
<!-- ... sub blocks ... -->
</block>
<!-- ... -->
<reference name="root">
    <block type="page/someothertype" name="root" template="path/to/some/other/template" />
    <!-- ... sub blocks ... -->
</reference>

<layout version="0.1.0">
    <default>
        <reference name="root">
            <block type="page/html" name="root" output="toHtml" template="helloworld/simple_page.phtml" />
        </reference>
    </default>
</layout>

http://example.com/helloworld/index/index?showLayout=handles

Handles For This Request
   1. default
   2. STORE_default
   3. THEME_frontend_default_gap
   4. helloworld_index_index
   5. customer_logged_out

http://example.com/helloworld/?showLayout=handles

http://example.com/helloworld/index/index?showLayout=package

http://example.com/helloworld/index/index?showLayout=package&showLayoutFormat=text

app/design/frontend/base/default/layout/

<layout>
    <updates>
        <core>
            <file>core.xml</file>
        </core>
        <page>
            <file>page.xml</file>
        </page>
        ...
     </updates>
</layout>

<default />
<catalogsearch_advanced_index />
etc...

<default />
<store_bare_us />
<theme_frontend_default_default />
<helloworld_index_index />
<customer_logged_out />

http://example.com/helloworld/index/index

<customer_account_index>
    <!-- ... -->
    <update handle="customer_account"/>
     !-- ... -->
</customer_account_index>

<layout version="0.1.0">
    <default>
        <reference name="root">
            <block type="page/html" name="root" output="toHtml" template="helloworld/simple_page.phtml" />
        </reference>
    </default>
</layout>

<layout version="0.1.0">
    <helloworld_index_index>
        <reference name="root">
             <block type="page/html" name="root" output="toHtml" template="helloworld/simple_page.phtml" />
        </reference>
    </helloworld_index_index>
</layout>

public function goodbyeAction() {
    $this->loadLayout();
    $this->renderLayout();
}

http://example.com/helloworld/index/goodbye

<layout version="0.1.0">
    <!-- ... -->
    <helloworld_index_goodbye>
        <update handle="helloworld_index_index" />
    </helloworld_index_goodbye>
</layout>

http://example.com/helloworld/index/index

http://example.com/helloworld/index/goodbye

template="helloworld/simple_page.phtml"

app/design/frontend/base/default

<helloworld_index_index>
    <reference name="root">
        <block type="page/html" name="root" template="helloworld/simple_page.phtml">
            <block type="customer/form_register" name="customer_form_register" template="customer/form/register.phtml"/>
        </block>
    </reference>
</helloworld_index_index>

<body>
    <?php echo $this->getChildHtml('customer_form_register'); ?>
</body>

         <body>
	    <h1>Links</h1>
	    < ?php echo $this->getChildHtml('top.links'); ?>
	    < ?php echo $this->getChildHtml('customer_form_register'); ?>
	</body>

<?xml version="1.0" encoding="UTF-8"?>
<layout version="0.1.0">
    <helloworld_index_index>
        <reference name="root">
            <block type="page/html" name="root" output="toHtml" template="helloworld/simple_page.phtml">
            	<block type="customer/form_register" name="customer_form_register" template="customer/form/register.phtml"/>
            	<block type="page/template_links" name="top.links"/>
            </block>
        </reference>
    </helloworld_index_index>
</layout>

protected function _construct()
{
    $this->setTemplate('page/template/links.phtml');
}