我有一個包含3個表的數據庫。這是一個簡單的n-m關係。學生,課程和StudentHasCourse處理n-m關係。我張貼schema.yml作爲參考,但它不是真的有必要。Symfony 1.4/Doctrine; n-m關係數據無法在模板中訪問(indexSuccess)
Course:
connection: doctrine
tableName: course
columns:
id:
type: integer(4)
fixed: false
unsigned: false
primary: true
autoincrement: false
name:
type: string(45)
fixed: false
unsigned: false
primary: false
notnull: false
autoincrement: false
relations:
StudentHasCourse:
local: id
foreign: course_id
type: many
Student:
connection: doctrine
tableName: student
columns:
id:
type: integer(4)
fixed: false
unsigned: false
primary: true
autoincrement: false
registration_details:
type: string(45)
fixed: false
unsigned: false
primary: false
notnull: false
autoincrement: false
name:
type: string(30)
fixed: false
unsigned: false
primary: false
notnull: false
autoincrement: false
relations:
StudentHasCourse:
local: id
foreign: student_id
type: many
StudentHasCourse:
connection: doctrine
tableName: student_has_course
columns:
student_id:
type: integer(4)
fixed: false
unsigned: false
primary: true
autoincrement: false
course_id:
type: integer(4)
fixed: false
unsigned: false
primary: true
autoincrement: false
result:
type: string(1)
fixed: true
unsigned: false
primary: false
notnull: false
autoincrement: false
relations:
Course:
local: course_id
foreign: id
type: one
Student:
local: student_id
foreign: id
type: one
然後,我從以下查詢中獲取來自executeIndex()中表的數據。
$q_info = Doctrine_Query::create()
->select('s.*, shc.*, c.*')
->from('Student s')
->leftJoin('s.StudentHasCourse shc')
->leftJoin('shc.Course c')
->where('c.id = 1');
$this->infos = $q_info->execute();
然後,我通過在indexSuccess.php的循環通過訪問數據。但是,在indexSuccess中,我只能訪問Student表中的數據。
<?php foreach ($infos as $info): ?>
<?php echo $info->getId(); ?>
<?php echo $info->getName(); ?>
<?php endforeach; ?>
我想,我可以訪問StudentHasCourse數據和課程數據,如下所示。 但是,它會產生一個錯誤。
<?php echo $info->getStudentHasCourse()->getResult()?>
<?php echo $info->getStudentHasCourse()->getCourse()->getName()?>
第一條語句給出警告;
Warning: call_user_func_array() expects parameter 1 to be a valid callback, class 'Doctrine_Collection' does not have a method 'getCourse' in D:\wamp\bin\php\php5.3.5\PEAR\pear\symfony\escaper\sfOutputEscaperObjectDecorator.class.php on line 64
而第二個聲明給出了上述警告和以下錯誤;
Fatal error: Call to a member function getName() on a non-object in D:\wamp\www\sam\test_doc_1\apps\frontend\modules\registration\templates\indexSuccess.php on line 5
當我檢查從它出現如下調試工具欄查詢和它給我想要的所有數據。
SELECT s.id AS s__id, s.registration_details AS s__registration_details, s.name AS s__name, s2.student_id AS s2__student_id, s2.course_id AS s2__course_id, s2.result AS s2__result, c.id AS c__id, c.name AS c__name
FROM student s LEFT JOIN student_has_course s2 ON s.id = s2.student_id LEFT JOIN course c ON s2.course_id = c.id
WHERE (c.id = 1)
雖然問題很簡短,但所提到的所有信息都變得如此之久。如果有人能幫助我解決這個問題,我將非常感激。我需要的是從StudentHasCourse和Course訪問數據。如果這些數據不能被這個設計和這個查詢訪問,那麼其他的方法也是值得讚賞的。
非常感謝您對您的信息greg0ire。這會幫助我解決問題。我會檢查它並讓你知道。 – chandimak
我照你所說的去做了。我可以創建訪問方法_getCourses()_和_getStudents()_。給定一個「學生證」,我可以接受課程。然而,我無法得到'StudentHasCourse'類的結果。雖然在上面的類中有一個_getResult()_,但我沒有找到解決方法。我最終要求的結果就是:給予'student_id'的'course_id,course_name,result'(來自關聯表)。非常感謝,如果你可以詳細說明你的答案,如果可能實現這一點。非常感謝您的寶貴時間。 – chandimak
我更新了我的答案 – greg0ire