[英]Format nested JSON object from Postgres query
我想獲得一個類似於這樣的JSON對象:
{
"username": "USERNAME",
"teamname": "TEAMNAME",
"logs": [
{
"log": {
"log_id": 29,
"person_id": 3,
"activity_id": 3,
"shoe_id": null,
"logdate": "2016-11-29",
"distance": null,
"activitytime": null,
"sleep": null,
"heartrate": null,
"logtitle": null,
"description": null
},
"activity": "Swim",
"comments": {
"comment_id": 1,
"description": "This is a comment",
"person_id": 1,
"log_id": 29
}
}]
}
目前,除了評論之外,我的所有格式都正確。 這是我正在使用的SQL查詢:
SELECT p.username, t.teamname, json_agg(json_build_object('log', l.*, 'comments', c.*, 'activity', a.activity)) as logs
FROM person_tbl p
INNER JOIN log_tbl l ON p.person_id = l.person_id
INNER JOIN activity_tbl a ON l.activity_id = a.activity_id
INNER JOIN comment_tbl c ON c.log_id = l.log_id
INNER JOIN person_team_tbl pt ON p.person_id = pt.person_id
INNER JOIN team_tbl t on t.team_id = pt.team_id
WHERE t.team_id = 5
AND l.logdate > NOW()::date - 7
GROUP BY p.username, t.teamname
ORDER BY p.username
我無法獲取每個日志的注釋。 現在,它返回每條評論並重復日志(它們沒有關聯)。
另外,當其他所有內容都為空時(如上周沒有日志的話),如何讓這個查詢返回username
和teamname
?
如果沒有SQLfiddle,我們不知道您的數據(和結構)是什么,因此很難回答您的問題。 對於NULL情況 - 請修改像這樣的WHERE子句(故意不使用COALESCE)
WHERE t.team_id = 5 AND (l.logdate IS NULL OR l.logdate > NOW()::date - INTERVAL '7 day')
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