[英]Insert a mysql table into another table with sub query
我正在使用PHP將具有兩列的CSV導入到現有表中(我正在使用Joomla / Virtuemart)
現有表中的列是ID(用戶ID)和product_id。
CSV文件中的列是product_sku和username,因此我需要首先連接到適當的表,以將id(用戶id)與用戶名進行匹配,而自豪ct_sku與product_id進行匹配。 我還需要修剪掉用戶名中的前導零以及使用sql完成的productku中的空格。
我創建了一個臨時表,其中包含CSV中的數據,然后將它們聯接到兩個表上。 我已經獲得了需要的數據,但是現在需要將該數據插入到現有表中。 理想情況下,我想使用mySQL進行此操作,是否可以將其作為子查詢來進行?
速度會有巨大差異嗎?
function do_query($file)
{
// $sql = "LOAD DATA INFILE ".$file['tmp_name']." INTO TABLE FavouritesTmp FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' (data1, data2)";
$sql = "CREATE TEMPORARY TABLE FavouritesTmp (
productsku VARCHAR(50) NOT NULL,
user VARCHAR(50) NOT NULL
)";
$this->_db->setQuery($sql);
$this->_db->query();
$handle = fopen($file['tmp_name'], "r");
do
{
if ($data[0])
{
$sql = "INSERT INTO `FavouritesTmp` (productsku, user) VALUES
(
'" . $data[0] . "',
'" . $data[1] . "'
)
";
$this->_db->setQuery($sql);
$this->_db->query();
}
}
while ($data = fgetcsv($handle, 1000, ",", "'"));
$sql = "SELECT TRIM(LEADING '0' FROM user) AS username,
productsku AS productsku,
jos_users.id AS id,
jos_vm_product.product_id AS product_id
FROM FavouritesTmp
LEFT JOIN jos_users ON ( TRIM(LEADING '0' FROM username ) = jos_users.username )
LEFT JOIN jos_vm_product ON TRIM(productsku) = jos_vm_product.product_sku";
$this->_db->setQuery($sql);
print_r($this->_db->loadAssocList());
}
您可以只使用insert . . . select
insert . . . select
insert . . . select
語法:
INSERT INTO ExistingTable(username, productsku, id, product_id)
SELECT TRIM(LEADING '0' FROM user) AS username,
productsku AS productsku,
jos_users.id AS id,
jos_vm_product.product_id AS product_id
FROM FavouritesTmp
LEFT JOIN jos_users ON ( TRIM(LEADING '0' FROM username ) = jos_users.username )
LEFT JOIN jos_vm_product ON TRIM(productsku) = jos_vm_product.product_sku;
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