如何将此MySQL语句转换为symfony Propel?

问题描述

这是MySQL:

SELECT *
FROM tbl1
WHERE name > (
  SELECT name
  FROM tbl1
  WHERE id = 3
)
ORDER BY name

这是我对Propel代码的最佳猜测，但它不起作用:

Here's my best guess at the Propel code but it's not working:

$c = new Criteria();
$c->addAscendingOrderByColumn(CartPeer::ITEM_NAME);
$c->add(CartPeer::CATEGORY, $c->add(CartPeer::ITEM_ID, $item->getItemId()), Criteria::GREATER_THAN);

在回复这个问题

推荐答案

Propel没有 standard 方法作为子条件的一部分来进行子查询.

Propel doesn't have a standard way of doing subqueries as part of a criteria.

您可以将查询分开(先获取要与之进行比较的值，然后将其用于原始查询)，或者在推进式查询中对子查询使用条件.

You can either separate your query (obtain the value you want to compare against first and then use it into the original query) or use a CUSTOM criteria with your subquery in your propel query.

这是第二个选项的示例:

Here's an example of the second option:

$c = new Criteria();

$subSelect = "cart.category > (
  SELECT cart.category
  FROM carts
  WHERE carts.id = 3)";

$c->add(CartPeer::CATEGORY, $subSelect, Criteria::CUSTOM);

编辑:这是第一个选项的示例

Here's an example of the first option

// find the object we want to compare against
$c = new Criteria();
$c->add(CartPeer::ID, 3); 
$cart = CartPeer::doSelectOne($c)

// then make the actual criteria
$c = new Criteria();
$c->add(CartPeer::CATEGORY, $cart->getCategory(), Criteria::GREATER_THAN)

此选项的唯一问题是您要进行两个查询而不是一个查询，这可能会影响您的性能，但这当然取决于您的应用程序.

The only problem with this option is that you are making two queries instead of one, which may hit on your performance, but it depends on your application of course.

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