問(wèn)題描述

我正在使用doctrine 2.1來(lái)為settings表創(chuàng)建一個(gè)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 

假設(shè)我有很多不同類別的設(shè)置.為了獲得特定類別的所有設(shè)置，我執(zhí)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);

此時(shí)一切正常.嗯.. 64,000 美元的問(wèn)題是:是否存在允許我讀取如下結(jié)果的數(shù)據(jù)訪問(wèn)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"

推薦答案

我明白了:這里的訣竅是使用 INDEX BY 詞.

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

導(dǎo)入 Query 類(并非總是可選的):

import the Query class (no always optional):

use DoctrineORMQuery;

創(chuàng)建查詢:

$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');

設(shè)置隱藏模式以使用只讀數(shù)組

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

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

顯示值:

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

查詢構(gòu)建器

使用 QueryBuilder 對(duì)象，您可以在 from 語(yǔ)句中設(shè)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，您可以通過(guò)以下方式訪問(wèn)該對(duì)象:

Then, you can access the object as:

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

這篇關(guān)于在學(xué)說(shuō)中使用列值作為數(shù)組索引的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！