我是Laravel的新手，我想知道我是应该使用Eloquent Query Builder还是仅使用原始SQL。 当我使用Eloquent从MySql中提取数据时，我得到了许多无关紧要的东西。
我使用Eloquent Query Builder的方法：
$query = Document::where('owner', $user_id);
$docs = $query->take(2)->get();
return $docs;
我得到的结果：
object(Illuminate\Database\Eloquent\Collection)[191]
protected 'items' =>
array (size=2)
0 =>
object(Document)[189]
protected 'table' => string 'documents' (length=9)
protected 'connection' => null
protected 'primaryKey' => string 'id' (length=2)
protected 'perPage' => int 15
public 'incrementing' => boolean true
public 'timestamps' => boolean true
protected 'attributes' =>
array (size=12)
'id' => int 2
'title' => string 'test' (length=4)
'description' => null
'status' => int 0
'files' => null
'uid' => string 'gregdf' (length=6)
'path' => string '[]' (length=2)
'owner' => int 1
'workspace' => int 1
'flow' => int 1
'created_at' => string '2014-12-10 10:10:10' (length=19)
'updated_at' => string '0000-00-00 00:00:00' (length=19)
protected 'original' =>
array (size=12)
'id' => int 2
'title' => string 'test' (length=4)
'description' => null
'status' => int 0
'files' => null
'uid' => string 'gregdf' (length=6)
'path' => string '[]' (length=2)
'owner' => int 1
'workspace' => int 1
'flow' => int 1
'created_at' => string '2014-12-10 10:10:10' (length=19)
'updated_at' => string '0000-00-00 00:00:00' (length=19)
protected 'relations' =>
array (size=0)
empty
protected 'hidden' =>
array (size=0)
empty
protected 'visible' =>
array (size=0)
empty
protected 'appends' =>
array (size=0)
empty
protected 'fillable' =>
array (size=0)
empty
protected 'guarded' =>
array (size=1)
0 => string '*' (length=1)
protected 'dates' =>
array (size=0)
empty
protected 'touches' =>
array (size=0)
empty
protected 'observables' =>
array (size=0)
empty
protected 'with' =>
array (size=0)
empty
protected 'morphClass' => null
public 'exists' => boolean true
1 =>
object(Document)[187]
protected 'table' => string 'documents' (length=9)
protected 'connection' => null
protected 'primaryKey' => string 'id' (length=2)
protected 'perPage' => int 15
public 'incrementing' => boolean true
public 'timestamps' => boolean true
protected 'attributes' =>
array (size=12)
'id' => int 3
'title' => string 'test' (length=4)
'description' => null
'status' => int 0
'files' => null
'uid' => string 'gregdf' (length=6)
'path' => null
'owner' => int 1
'workspace' => int 1
'flow' => int 1
'created_at' => string '0000-00-00 00:00:00' (length=19)
'updated_at' => string '0000-00-00 00:00:00' (length=19)
protected 'original' =>
array (size=12)
'id' => int 3
'title' => string 'test' (length=4)
'description' => null
'status' => int 0
'files' => null
'uid' => string 'gregdf' (length=6)
'path' => null
'owner' => int 1
'workspace' => int 1
'flow' => int 1
'created_at' => string '0000-00-00 00:00:00' (length=19)
'updated_at' => string '0000-00-00 00:00:00' (length=19)
protected 'relations' =>
array (size=0)
empty
protected 'hidden' =>
array (size=0)
empty
protected 'visible' =>
array (size=0)
empty
protected 'appends' =>
array (size=0)
empty
protected 'fillable' =>
array (size=0)
empty
protected 'guarded' =>
array (size=1)
0 => string '*' (length=1)
protected 'dates' =>
array (size=0)
empty
protected 'touches' =>
array (size=0)
empty
protected 'observables' =>
array (size=0)
empty
protected 'with' =>
array (size=0)
empty
protected 'morphClass' => null
public 'exists' => boolean true
我使用SQL的方法：
$sqlArgs = array(
'workspace' => $args['workspace'],
'usr' => $user_id
);
$query = 'select d.title, d.description, d.created_at
from documents as d
inner join userDocuments as ud on ud.document = d.id
where ud.user = :usr and d.workspace = :workspace limit 0, 2 ';
$docs = DB::select($query, $sqlArgs);
return $docs;
和结果（这是我真正需要的）：
array (size=2)
0 =>
object(stdClass)[185]
public 'title' => string 'test' (length=4)
public 'description' => null
public 'created_at' => string '2014-12-10 10:10:10' (length=19)
1 =>
object(stdClass)[189]
public 'title' => string 'test' (length=4)
public 'description' => null
public 'created_at' => string '0000-00-00 00:00:00' (length=19)
那么哪种方法更好？或者我可以以某种方式限制Eloquent方法中的数据量？
更新：以上两个示例都在查询不同的记录集，但重要的是每个记录有多少数据是返回。
答案 0 :(得分：0)
您可以指定您不感兴趣的字段。
class Car extends Eloquent {
protected $hidden = array('created_at');
}
答案 1 :(得分：0)
您需要将Select用于您想要的列，如下所示
$query = Document::where('owner', '=', $user_id)->lists('title', 'description', 'created_at');
它只会有title，description和created_at列。
为了限制雄辩查询，您可以将take与select一起使用，如下所示
$query = Document::where('owner', '=', $user_id)->lists('title', 'description', 'created_at')->take(5)->get();
答案 2 :(得分：0)
更多的是设计问题。 Eloquent是一个ORM（彻底阅读有关ORM的内容），即它通过对象表示所有记录，所有记录及其相关记录可以以更面向对象的方式进行操作。您可以查询数据库和/或在PHP中创建其架构，而不是触摸SQL。这样，可以在DB上放置过多的抽象。
为了提供思考的食物，人们可以通过雄辩，在多个部署中以不同方式操纵相同的数据库，为可能拥有自己的主键和/或关系的单个表设置截然不同的配置文件。
手工定制的SQL总是比使用任何ORM更快。这实际上取决于你认为更好的选择。
虽然toArray()方法更清晰，但我倾向于避免使用它。您可以按$fieldValues = $model->attributes提取单个模型的字段值。