[英]Insert a mysql table into another table with sub query
I'm Importing a CSV with two columns into an existing table using PHP (I'm using Joomla/Virtuemart) 我正在使用PHP将具有两列的CSV导入到现有表中(我正在使用Joomla / Virtuemart)
The columns in the existing table are id (user id) and product_id. 现有表中的列是ID(用户ID)和product_id。
The columns from the CSV file are product_sku and username so I need to first join to the appropriate tables to match the id (user id) with the username, and proudct_sku to product_id. CSV文件中的列是product_sku和username,因此我需要首先连接到适当的表,以将id(用户id)与用户名进行匹配,而自豪ct_sku与product_id进行匹配。 I also need to trim leading zeros off the username, and whitespace from the productsku which I've done using sql. 我还需要修剪掉用户名中的前导零以及使用sql完成的productku中的空格。
I created a temporary table containing the data in the CSV, then joined onto both tables. 我创建了一个临时表,其中包含CSV中的数据,然后将它们联接到两个表上。 I've got the data I need back but now need to insert that data into the existing table. 我已经获得了需要的数据,但是现在需要将该数据插入到现有表中。 Ideally I'd like to do this with mySQL, is it possible to do this as a sub query? 理想情况下,我想使用mySQL进行此操作,是否可以将其作为子查询来进行?
Would there be a massive difference in speed? 速度会有巨大差异吗?
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());
}
You can just use insert . . . select
您可以只使用insert . . . select
insert . . . select
insert . . . select
syntax: insert . . . select
语法:
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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