學說symfony多個leftjoin查詢

Question

我試圖運行這個查詢，並得到錯誤「未知的關係別名程序」。 這是查詢。

$q= Doctrine_Query::create() 
      ->select('students.firstname', 
         'students.middlename', 
         'students.lastname', 
         'programs.program', 
         'courses.title', 
         'programcourses.year') 
      ->from('students s, s.programs p, p.programcourses p2, p2.courses c'); 

我也試過這個。

$q= Doctrine_Query::create() 
      ->select('students.firstname', 
         'students.middlename', 
         'students.lastname', 
         'programs.program', 
         'courses.title', 
         'programcourses.year') 
      ->from('students') 
      ->leftJoin('programs') 
      ->leftJoin('programcourses') 
      ->leftJoin('courses') 
      ->where("idstudents=".$studentid); 

這是我的Schema.yml。

Courses: 
    connection: doctrine 
    tableName: courses 
    columns: 
    idcourses: 
     type: integer(4) 
     fixed: false 
     unsigned: false 
     primary: true 
     autoincrement: true 
    title: 
     type: string(45) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    relations: 
    Programcourses: 
     local: idcourses 
     foreign: idcourses 
     type: many 
Programcourses: 
    connection: doctrine 
    tableName: programcourses 
    columns: 
    idprogramcourses: 
     type: integer(4) 
     fixed: false 
     unsigned: false 
     primary: true 
     autoincrement: true 
    idprograms: 
     type: integer(4) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    idcourses: 
     type: integer(4) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    year: 
     type: integer(4) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    relations: 
    Courses: 
     local: idcourses 
     foreign: idcourses 
     type: one 
    Programs: 
     local: idprograms 
     foreign: idprograms 
     type: one 
Programs: 
    connection: doctrine 
    tableName: programs 
    columns: 
    idprograms: 
     type: integer(4) 
     fixed: false 
     unsigned: false 
     primary: true 
     autoincrement: false 
    program: 
     type: string(45) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    relations: 
    Programcourses: 
     local: idprograms 
     foreign: idprograms 
     type: many 
    Students: 
     local: idprograms 
     foreign: idprograms 
     type: many 
Roles: 
    connection: doctrine 
    tableName: roles 
    columns: 
    idroles: 
     type: integer(4) 
     fixed: false 
     unsigned: false 
     primary: true 
     autoincrement: false 
    role: 
     type: string(45) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
Students: 
    connection: doctrine 
    tableName: students 
    columns: 
    idstudents: 
     type: integer(4) 
     fixed: false 
     unsigned: false 
     primary: true 
     autoincrement: true 
    firstname: 
     type: string(45) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    middlename: 
     type: string(45) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    lastname: 
     type: string(45) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    idprograms: 
     type: integer(4) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    session: 
     type: integer(4) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    username: 
     type: string(45) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    password: 
     type: string(45) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    email: 
     type: string(255) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    relations: 
    Programs: 
     local: idprograms 
     foreign: idprograms 
     type: one 
Teachers: 
    connection: doctrine 
    tableName: teachers 
    columns: 
    idteachers: 
     type: integer(4) 
     fixed: false 
     unsigned: false 
     primary: true 
     autoincrement: true 
    firstname: 
     type: string(45) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    lastname: 
     type: string(45) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    username: 
     type: string(45) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    password: 
     type: string(45) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 
    email: 
     type: string(255) 
     fixed: false 
     unsigned: false 
     primary: false 
     notnull: false 
     autoincrement: false 

還有一個mysql的dql轉換工具嗎？首先我進行mysql查詢，然後將這些查詢更改爲dql。有一個簡單的方法嗎？

Answer 1

您可以使用命令行symfony doctrine輕鬆地嘗試您的dql：dql 現在，在您的查詢中，您的關係程序使用小寫字母，而在模式中使用大寫字母。 如果我是你，我會嘗試這樣的事：

$q= Doctrine_Query::create() 
      ->select('s.firstname, 
         s.middlename, 
         s.lastname, 
         p.program, 
         c.title, 
         pc.year') 
      ->from('Students s') 
      ->leftJoin('s.Programs p') 
      ->leftJoin('p.Programcourses pc') 
      ->leftJoin('pc.Courses') 
      ->where("idstudents = ?", $studentid); 

Answer 2

有在你的答案格雷格稍有不慎，如果u可以看到選擇功能，每列名由逗號分隔，它應該是這樣的..

$q= Doctrine_Query::create() 
     ->select('s.firstname, 
        s.middlename, 
        s.lastname, 
        p.program, 
        c.title, 
        pc.year') 
     ->from('Students s') 
     ->leftJoin('s.Programs p') 
     ->leftJoin('p.Programcourses pc') 
     ->leftJoin('pc.Courses c') 
     ->where("idstudents = ".$studentid);