1.Database Connections In Magento
$resource = Mage::getSingleton('core/resource');
$readConnection=$resource->getConnection('core_read');
$writeConnection =
$resource->getConnection('core_write');2.Get Table Name
$tableName =
$resource->getTableName('catalog/product');
3.Reading From The Database
3.1Varien_Db_Select::fetchAll
/** * Get the resource model */ $resource= Mage::getSingleton('core/resource'); /** * Retrieve the read connection */ $readConnection=$resource->getConnection('core_read'); $query='SELECT * FROM '.
$resource->getTableName('catalog/product'); /** * Execute the query and store the results in $results */ $results=$readConnection->fetchAll($query); /** * Print out the results */ var_dump($results);
3.2Varien_Db_Select::fetchCol
/** * Get the resource model */ $resource= Mage::getSingleton('core/resource'); /** * Retrieve the read connection */ $readConnection=$resource->getConnection('core_read'); /** * Retrieve our table name */ $table=$resource->getTableName('catalog/product'); /** * Execute the query and store the results in $results */ $sku=$readConnection->fetchCol('SELECT
sku FROM '.$table
. '); /** * Print out the results */ var_dump($results);3.3Varien_Db_Select::fetchOne
/**
* Get the resource model */ $resource= Mage::getSingleton('core/resource'); /** * Retrieve the read connection */ $readConnection=$resource->getConnection('core_read'); /** * Retrieve our table name */ $table=$resource->getTableName('catalog/product'); /** * Set the product ID */ $productId= 44; $query='SELECT sku FROM '.$table
. ' WHERE entity_id = ' . (int)$productId.' LIMIT 1'; /** * Execute the query and store the result in $sku */ $sku=$readConnection->fetchOne($query); /** * Print the SKU to the screen */ echo'SKU: '.
$sku.'<br/>';4.Writing To The Database
<?php /** * Get the resource model */ $resource= Mage::getSingleton('core/resource'); /** * Retrieve the write connection */ $writeConnection=$resource->getConnection('core_write'); /** * Retrieve our table name */ $table=$resource->getTableName('catalog/product'); /** * Set the product ID */ $productId= 44; /** * Set the new SKU * It is assumed that you are hard coding the new SKU in * If the input is not dynamic, consider using the * Varien_Db_Select object to insert data */ $newSku='new-sku'; $query="UPDATE {$table} SET sku = '{$sku}' WHERE entity_id = " . (int)$productId; /** * Execute the query */ $writeConnection->query($query);Truncate table`tb_category`;
INSERT INTO `tb_category` (`cid`, `parent_cid`, `name`, `is_leaf`, `sort_order`, `feature_list`)
SELECT * FROM (SELECT 11122, 0, '數碼相機/單反相機/攝像機', 'false', 27, '') AS tmp
WHERE NOT EXISTS (
SELECT `cid` FROM `tb_category` WHERE `cid`=11122
)