在教义中使用列值作为数组索引

问题描述

我正在使用学说 2.1 为 settings 表创建模型:

I am using doctrine 2.1 in order to create a model for settings table:

id |  arg  |  value  |  category
1  |  name |  foo    |  general_settings 
2  |  desc |  bar    |  general_settings 

假设我有很多不同类别的设置.为了获得特定类别的所有设置，我执行以下操作:

Suppose that I have a lot of setting for different categories. In order to get all the setting for a specific category I do something like this:

$q = Doctrine_Query::create()
    ->from('Setting p')
    ->where('p.category = ?', $category_name);

此时一切正常.嗯.. 64,000 美元的问题是:是否存在允许我读取如下结果的数据访问替代方案?

Everything works fine at this point. Well.. the question of $64,000 is: Do exist a data access alternative that allow me to read the result as below?

$resultSet = $q->execute(); 

//the magic here could be use the -arg- column as index
$requested_setting = $resulSet['name']  

//print the setting value
echo $requested_setting['value'];  //should prints "foo"

//another way
echo $resulSet['desc']['value']; //should prints "bar"

推荐答案

我明白了:这里的窍门是使用 INDEX BY 字.

I got it: the trick here is use the INDEX BY word.

导入查询类(并非总是可选的):

import the Query class (no always optional):

use DoctrineORMQuery;

创建查询:

$query = $this->data->em->createQuery('
    SELECT s 
    FROM modelsSetting s 
    INDEX BY s.arg //to set array custom key
    WHERE s.category = :category');
$query->setParameter('category', 'general');

设置隐藏模式以使用只读数组

set the hidration mode in order to work with read-only arrays

$settings = $query->getResult(Query::HYDRATE_ARRAY); 

显示值:

echo $settings['desc']['value'];  // prints "bar"

查询生成器

使用 QueryBuilder 对象，您可以在 from 语句中设置索引:

QueryBuilder

With the QueryBuilder object you can set the index at the from statement:

$qb = $em->createQueryBuilder();
$qb->select('s');
$qb->from('modelsSettings', 's', 's.arg');  // here the magic
$result = $qb->getQuery()->getResult();

然后，您可以通过以下方式访问该对象:

Then, you can access the object as:

$description = $result['desc'];
$value = $description->getValue();

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