我试图让这个代码更新,如果参数存在,但是,当我执行没有任何事情发生时(它确实说完了,更新产品,但更新products_description,似乎没有用。代码在这里:
$query = "UPDATE products
SET products_reference='$varenummer', products_price='$pris'
WHERE products_id='$id';";
for ($x = 1; $x <= $amountOfLanguages; $x++) {
$varenavn = $_POST["varenavn-" . $x];
$korttekst = $_POST["korttekst-" . $x];
$langtekst = $_POST["langtekst-" . $x];
$query .= "IF EXISTS (SELECT * FROM products_description WHERE products_id='$id' AND languages_id='$x')
UPDATE products_description
SET products_description_name='$varenavn', products_description_short_description='$korttekst', products_description_description='$langtekst'
WHERE products_id='$id'
AND languages_id='$x'
ELSE
INSERT INTO products_description (products_id, languages_id, products_description_name, products_description_short_description, products_description_description)
VALUES ('$id', '$x', '$varenavn', '$korttekst', '$langtekst');";
}
if ($conn->multi_query($query) === TRUE) {
//header("Location: ./");
//die();
echo "done";
} else {
echo "Error: " . $query . "<br>" . $conn->error;
}
我不能真正使用ON DUPLICATE,因为我不知道唯一的密钥,我只知道“products_id”和“languages_id”。
提前致谢。
答案 0 :(得分:0)
你可以在mysql中使用更简洁,更紧凑的语法 - 在重复更新时使用&#39; - 对于这种情况。查询的一般原则如下: -
insert into `TABLE` ( `FIELD1`,`FIELD2`, `FIELD3` ) values ( 'VALUE1','VALUE2','VALUE3' )
on duplicate key
update
`FIELD1`='VALUE1',
`FIELD2`='VALUE2',
`FIELD1`='VALUE3';
Basing this on original query.
------------------------------
insert into `products_description`
(`products_id`, `languages_id`, `products_description_name`, `products_description_short_description`, `products_description_description` )
values
( '$id', '$x', '$varenavn', '$korttekst', '$langtekst' )
on duplicate key
update
`products_id`='$id',
`languages_id`='$x';