我有一个问题,这可能是一个简单的问题解决方案,但我似乎无法弄明白。我是PHP和MySQL的新手,所以我到处都在阅读所有内容,但缺乏经验非常令人沮丧,因为经常需要很长时间才能实现一个小错误。请查看下表并阅读下面的问题。
PHP / mysql在Joomla环境中,我正在尝试修改插件,因此将来自不同表的值更新为一组其他表,这些表原本不是预期的,但所有表都驻留在同一个数据库中
Table 1 vm_orders
---------------------------------------------
order_id user_id
---------------------------------------------
20 1
55 6
65 2
30 4
50 67
Table 2 vm_order_item
---------------------------------------------
order_item_id order_id order_item_sku
---------------------------------------------
20 20 1
55 55 35
65 65 60
30 30 22
50 50 3
Table 3 xipt_ users
---------------------------------------------------
userid Profiletype template
----------------------------------------------------
1 1 default
6 3 default
2 1 default
4 8 default
67 7 default
Table 4 community_fields_values
---------------------------------------------
id user_id field_id value
---------------------------------------------
1 1 55 Female
2 6 35 Cat
3 2 2 2
4 4 18 Texas
5 67 12 bike
我需要的是首先根据下订单的用户获取订单号。 userid变量正在从脚本的其他位置传递。那部分工作正常。 因此用户67已下订单。这些是我想要实现的目标。
查询1:我想从vm_orders表(表1)的“order_id”列中获取“orderid”值;我将调用结果“vmorderid”并在另一个查询中使用它。
查询2:使用查询1中的“vmorderid”作为vm_order_item表(表2)的“order_id”列中的order_id值。 我想从my_order_item表(表2)的“order_item_sku”列中获取order_item_sku值。 我将调用结果“vmsku”并在另一个查询中使用它。
查询3:使用查询2中的“vmsku”作为vm_users表(表3)的“Profiletype”列中的profiletype值。 我想更新“profiletype”列的值,并带有“vmsku”值。
查询4:使用来自查询2的“vmsku”作为community_fields_values(表4)的“value”列中的值。 我想在my_fields_values(表4)“vmsku”值中更新“value”列的值。
好的,我希望你到目前为止和我在一起,我已经尝试了几个问题,但它没有用。 以下是我到目前为止的情况:
假设用户正从param字段传递。
$userid = $this->params->get('userid', 'defaultValue');
function _vm_custom_order($vmorderId)
{
$vmorderId = $database->loadResult();
$database = JFactory::getDBO();
// query the db to see if the user is already a member of group
$vmorderId ="
SELECT MAX
`order_id`
FROM
#__vm_orders';
WHERE
`user_id` = '{$userid}'
";
$database->setQuery( $vmorderId );
$data = $database->loadResult();
return $data;
}
function _vm_sku($vmsku)
{
$vmsku = $database->loadResult();
$database = JFactory::getDBO();
// query the db to see if the user is already a member of group
$vmsku = "
SELECT
`product_sku`
FROM
#__vm_order_item';
WHERE
`order_id` = '{$vmorderId}'
";
$database->setQuery( $vmsku );
$data = $database->loadResult();
return $data;
}
function _add( $userid, $groupid, $vmsku)
{
$success = false;
$database = JFactory::getDBO();
if (!$allow_multiplegroups = $this->params->get( 'allow_multiplegroups', '1' )) {
// query the db to see if the user is already a member of ANY group
$database->setQuery("
SELECT
`profiletype`
FROM
#__xipt_users
WHERE
`userid` = '{$userid}'
");
$member = $database->loadResult();
// if so, do not execute
if (intval($member) > 0) {
return $success;
}
}
$already = plgAmbrasubsAddToXipt::_already( $userid, $groupid );
if (($already != $userid))
{
$database->setQuery("
SELECT MAX
`order_id`
FROM
#__vm_orders
WHERE
`user_id` = '{$userid}'
");
$vmorderId = $database->loadResult();
if ($database->query()) {
$success = true;
}
}
if (($already != $userid))
{
$database->setQuery("
SELECT
`product_sku`
FROM
#__vm_order_item
WHERE
`order_id` = '{$vmorderId}'
");
$vmsku = $database->loadResult();
if ($database->query()) {
$success = true;
}
}
// if they aren't already a member of the group, add them to the group
if (($already != $userid))
{
$database->setQuery("
UPDATE
#__xipt_users
SET
`profiletype` = '{$vmsku}'
WHERE
`userid` = '{$userid}'
LIMIT 1
");
if ($database->query()) {
$success = true;
}
}
return $success;
}
}
我也是这样试过的:
function _add( $userid, $groupid, $vmsku)
{
$success = false;
$database = JFactory::getDBO();
if (!$allow_multiplegroups = $this->params->get( 'allow_multiplegroups', '1' )) {
// query the db to see if the user is already a member of ANY group
$database->setQuery("
SELECT
`profiletype`
FROM
#__xipt_users
WHERE
`userid` = '{$userid}'
");
$member = $database->loadResult();
// if so, do not execute
if (intval($member) > 0) {
return $success;
}
}
$already = plgAmbrasubsAddToXipt::_already( $userid, $groupid );
if (($already != $userid))
{
$database->setQuery("
SELECT MAX
`order_id`
FROM
#__vm_orders
WHERE
`user_id` = '{$userid}'
");
$vmorderId = $database->loadResult();
if ($database->query()) {
$success = true;
}
}
if (($already != $userid))
{
$database->setQuery("
SELECT
`product_sku`
FROM
#__vm_order_item
WHERE
`order_id` = '{$vmorderId}'
");
$vmsku = $database->loadResult();
if ($database->query()) {
$success = true;
}
}
// if they aren't already a member of the group, add them to the group
if (($already != $userid))
{
$database->setQuery("
UPDATE
#__xipt_users
SET
`profiletype` = '{$vmsku}'
WHERE
`userid` = '{$userid}'
LIMIT 1
");
if ($database->query()) {
$success = true;
}
}
return $success;
}
}
编辑:我现在按照建议尝试,使用JOIN完成任务,到目前为止没有快乐!
更新
#__xipt_users
SET
`profiletype.#__xipt_users` = `product_sku.#__vmsku`
WHERE
`userid` = '{$userid}'
AND
(
SELECT `order_id.#__vm_orders`
FROM #__vm_orders, #__vm_order_item
LEFT JOIN #__vm_orders
ON #__vm_orders.`order_id` = #__vm_order_item.`order_id`
ORDER BY `order_id.#__vm_order` DESC LIMIT 1
WHERE
`user_id.#__vm_orders` = '{$userid}'
) AS #__vmorder_id
SELECT ` product_sku.#__vm_order_item`
FROM #__vm_order_item, #__vmorder_id
LEFT JOIN #__vm_order_item
ON `#__vm_order_item.order_id` = `#__vmorder_id.order_id`
WHERE
`order_id.#__vm_order_item` = `order_id.#__vmorder_id`
)
AS #__vmsku
LIMIT 1
");
答案 0 :(得分:3)
加入语句
我建议你开始学习如何在MySQL中创建Join语句。
看看这个网站:
http://www.keithjbrown.co.uk/vworks/mysql/mysql_p5.php
通过这种方式,您可以将多个查询合并为一个。这将使这项工作变得更加容易!
一张纸
此外,它还可以帮助您在一张纸上绘制数据库,以便更好地了解您想要做什么。例如,您可以在要链接的表字段之间绘制线条。