Update Magento 1.5 to 1.7

1. First of all prepare your environment for a big time of php execution, this can depend on the size of your database. 1.a Increase the time to your PHP

max_execution_time = 10800     ; Maximum execution time of each script, in seconds, 10800 = 3 hours
max_input_time = 10800 ; Maximum amount of time each script may spend parsing request data

1.b Increase also in your Apache

BusyTimeout 10800
ProcessLifeTime 10800
IPCConnectTimeout 20
IPCCommTimeout 10800
MaxRequestsPerProcess -1

2. Run the updates of Magento

chmod 755 mage
rm -rf var/cache/* downloader/pearlib/cache/* downloader/pearlib/download/*
./mage mage-setup .
./mage sync --force
./mage config-set preferred_state stable
./mage list-upgrades
./mage install http://connect20.magentocommerce.com/community Mage_All_Latest --force
rm -rf var/cache/* downloader/pearlib/cache/* downloader/pearlib/download/*
chmod 755 mage

2.a This step always occurs an error. This step is for re-index the tables.

php shell/indexer.php reindexall

This is the error but is normal, it will fix on the way. It only happen in the "Product Price"

Product Prices index process unknown error:
exception 'PDOException' with message 'SQLSTATE[42S22]: Column not found: 1054 Unknown column 'website_date' in 'field list'' in /home/erjpub/documents/public_html/lib/Zend/Db/Statement/Pdo.php:228
Stack trace:
#0 /home/erjpub/documents/public_html/lib/Zend/Db/Statement/Pdo.php(228): PDOStatement->execute(Array)
#1 /home/erjpub/documents/public_html/lib/Varien/Db/Statement/Pdo/Mysql.php(110): Zend_Db_Statement_Pdo->_execute(Array)
#2 /home/erjpub/documents/public_html/lib/Zend/Db/Statement.php(300): Varien_Db_Statement_Pdo_Mysql->_execute(Array)
#3 /home/erjpub/documents/public_html/lib/Zend/Db/Adapter/Abstract.php(479): Zend_Db_Statement->execute(Array)
#4 /home/erjpub/documents/public_html/lib/Zend/Db/Adapter/Pdo/Abstract.php(238): Zend_Db_Adapter_Abstract->query('INSERT INTO `ca...', Array)
#5 /home/erjpub/documents/public_html/lib/Varien/Db/Adapter/Pdo/Mysql.php(419): Zend_Db_Adapter_Pdo_Abstract->query('INSERT INTO `ca...', Array)
#6 /home/erjpub/documents/public_html/lib/Varien/Db/Adapter/Pdo/Mysql.php(1974): Varien_Db_Adapter_Pdo_Mysql->query('INSERT INTO `ca...', Array)
#7 /home/erjpub/documents/public_html/lib/Varien/Db/Adapter/Pdo/Mysql.php(1947): Varien_Db_Adapter_Pdo_Mysql->insertArray('catalog_product...', Array, Array)
#8 /home/erjpub/documents/public_html/app/code/core/Mage/Catalog/Model/Resource/Product/Indexer/Price.php(599): Varien_Db_Adapter_Pdo_Mysql->insertMultiple('catalog_product...', Array)
#9 /home/erjpub/documents/public_html/app/code/core/Mage/Catalog/Model/Resource/Product/Indexer/Price.php(378): Mage_Catalog_Model_Resource_Product_Indexer_Price->_prepareWebsiteDateTable()
#10 /home/erjpub/documents/public_html/app/code/core/Mage/Index/Model/Indexer/Abstract.php(143): Mage_Catalog_Model_Resource_Product_Indexer_Price->reindexAll()
#11 /home/erjpub/documents/public_html/app/code/core/Mage/Index/Model/Process.php(209): Mage_Index_Model_Indexer_Abstract->reindexAll()
#12 /home/erjpub/documents/public_html/app/code/core/Mage/Index/Model/Process.php(255): Mage_Index_Model_Process->reindexAll()
#13 /home/erjpub/documents/public_html/shell/indexer.php(158): Mage_Index_Model_Process->reindexEverything()
#14 /home/erjpub/documents/public_html/shell/indexer.php(198): Mage_Shell_Compiler->run()
#15 {main}

2.b Keep with the update

./mage upgrade-all --force
find . -type f -exec chmod 644 {} \;
find . -type d -exec chmod 777 {} \;
chmod 750 mage
chmod o+w var var/.htaccess app/etc
chmod -R o+w media
chmod -R 777 var/package var/locks var/report var/export downloader 

3. Update to 1.7 is succesfull, but the pager doesn't work as expected. This is because an missing function. 3.a Go to 'app/code/core/Mage/Catalog/Block/Product/List/Toolbar.php' line 35. Look up this line

class Mage_Catalog_Block_Product_List_Toolbar extends Mage_Core_Block_Template

Change it by this

class Mage_Catalog_Block_Product_List_Toolbar extends Mage_Page_Block_Html_Pager