Question

我有两个表叫做会议，一个叫出席，出勤是一个多对多的关系数据库，格式如下：

Attendance:
    user_id | meeting_id | invited
    --------+------------+--------
    1       | 5          | 1
    2       | 5          | 0
    3       | 4          | 0
    3       | 5          | 1
    3       | 6          | 0

会议的格式如下：

Meetings:
    meeting_id | meeting_name | owner_id
    -----------+--------------+----------
    3          | Awesome      | 2
    4          | Boring       | 2
    5          | Cool         | 5
    9          | Sexy         | 3

每次会议只能有一个会议行，但每次会议的出席行数不受限制（限于每次会议的每个可能的用户）。

如何在SQL和/或Propel中创建一些内容，列出所有会议，其中（提供的）user_id是会议中的owner_id，或者是user_id，并在考勤数据库中受邀。

在搜索以下用户ID 3时，我正在寻找结果（基于以上数据）

Result for userid3:
    meeting_id | meeting_name | owner_id
    -----------+--------------+----------
    5          | Cool         | 5     - Because userid 3 is attending meeting 5
    9          | Sexy         | 3     - Because userid 3 owns meeting 9

我目前有以下不能正常工作，并且每次会议产生多行（因为会议在考勤数据库中存在多次）。

$criteria->addJoin(MeetingMeetingsPeer::ID, MeetingAttendancePeer::MEETING_ID, Criteria::LEFT_JOIN);

$criterion = $criteria->getNewCriterion(MeetingMeetingsPeer::OWNER_ID, Meeting::getUserId());
$criterion->addOr($criteria->getNewCriterion(MeetingAttendancePeer::USER_ID, Meeting::getUserId()));

$criteria->add($criterion); 
return $criteria;

这与SQL中的以下内容类似：

SELECT meeting_meetings.ID, meeting_meetings.OWNER_ID, meeting_meetings.GROUP_ID, meeting_meetings.NAME, meeting_meetings.COMPLETED, meeting_meetings.LOCATION, meeting_meetings.START, meeting_meetings.LENGTH, meeting_meetings.CREATED_AT, meeting_meetings.UPDATED_AT FROM `meeting_meetings` LEFT JOIN meeting_attendance ON (meeting_meetings.ID=meeting_attendance.MEETING_ID) WHERE (meeting_meetings.OWNER_ID=1 OR meeting_attendance.USER_ID=1)

感谢您的时间，

Answer 1

这可以让您获得user_id 1拥有的所有会议，以及user_id 1所参加的所有会议。

SELECT meeting_meetings.ID, meeting_meetings.OWNER_ID, meeting_meetings.GROUP_ID, meeting_meetings.NAME, 
meeting_meetings.COMPLETED, meeting_meetings.LOCATION, meeting_meetings.START, meeting_meetings.LENGTH, 
meeting_meetings.CREATED_AT, meeting_meetings.UPDATED_AT 
FROM `meeting_meetings`
WHERE `meeting_meetings`.`owner_id` = 1
UNION DISTINCT
SELECT meeting_meetings.ID, meeting_meetings.OWNER_ID, meeting_meetings.GROUP_ID, meeting_meetings.NAME, 
meeting_meetings.COMPLETED, meeting_meetings.LOCATION, meeting_meetings.START, meeting_meetings.LENGTH, 
meeting_meetings.CREATED_AT, meeting_meetings.UPDATED_AT 
FROM `meeting_meetings`
JOIN `meeting_attendance` ON `meeting_meetings`.`meeting_id` = `meeting_attendance`.`meeting_id` AND `meeting_attendance`.`invited`
WHERE `meeting_attendance`.`user_id` = 1

有点笨重。就个人而言，我会考虑在owner表中添加meetings_attendance标志。

PHP Propel ORM MySQL - 左对多加入

1 个答案: