Magento1 - Create category attribute

create-category-attribute.php

<?php

//XML <class>Mage_Catalog_Model_Resource_Eav_Mysql4_Setup</class>

/* @var $installer Mage_Core_Model_Resource_Setup */
$installer = $this;

$installer->startSetup();

$entityTypeId     = $installer->getEntityTypeId('catalog_category');
$attributeSetId   = $installer->getDefaultAttributeSetId($entityTypeId);
$attributeGroupId = $installer->getDefaultAttributeGroupId($entityTypeId, $attributeSetId);

$installer->addAttribute('catalog_category', 'banner_link',  array(
    'type'     => 'int',
    'label'    => 'Banner Link',
    'input'    => 'text',
    'global'   => Mage_Catalog_Model_Resource_Eav_Attribute::SCOPE_STORE,
    'visible'           => true,
    'required'          => false,
    'user_defined'      => false,
    'default'           => 0
));


$installer->addAttributeToGroup(
    $entityTypeId,
    $attributeSetId,
    $attributeGroupId,
    'banner_link',
    '11'					//last Magento's attribute position in General tab is 10
);

$attributeId = $installer->getAttributeId($entityTypeId, 'banner_link');

$installer->run("
INSERT INTO `{$installer->getTable('catalog_category_entity_int')}`
(`entity_type_id`, `attribute_id`, `entity_id`, `value`)
    SELECT '{$entityTypeId}', '{$attributeId}', `entity_id`, '1'
        FROM `{$installer->getTable('catalog_category_entity')}`;
");

$installer->endSetup();