mariadb 查询和使用邮递员的不同输出

Question

您好，我想从数据库到后端查询 return 一个 JSON 值。当我直接从数据库 (phpmyadmin) 查询它时，它工作正常并且查询 return 正确的值。但是当我使用邮递员访问它时，它 returns 不同的值（它 returns null）

这是来自 phpmyadmin 的查询结果

{
"name": "Desi Ratnaningsih", 
"day": "Monday", 
"schedule": 
    [
        {"start": "10:00:00", "end": "13:00:00"},
        {"start": "17:00:00", "end": "20:00:00"}
    ]
}

这是邮递员的结果

{
    "name": "Desi Ratnaningsih",
    "day": "Monday",
    "schedule": null
}

这是我的查询

SELECT DISTINCT JSON_OBJECT( 
'name', d.name, 
'day', s.day, 
'schedule', JSON_EXTRACT(( 
           SELECT CONCAT('[', GROUP_CONCAT( JSON_OBJECT( 'start', h.start, 'end', h.end )) ,']') 
           FROM hours h JOIN schedules s ON h.id = s.working_hour 
           JOIN doctors d ON s.doctor_id = d.doctor_id WHERE d.doctor_id =1 AND s.day="Monday"),'$') ) AS data 
FROM doctors d JOIN schedules s ON d.doctor_id=s.doctor_id 
JOIN hours h on s.working_hour = h.id 
WHERE d.doctor_id = 1 AND s.day="Monday";

Answer 1

这是simpler/correct吗？

SELECT JSON_OBJECT( 
'name', d.name, 
'day', s.day, 
'schedule', JSON_ARRAYAGG( JSON_OBJECT( 'start', h.start, 'end', h.end )) 
) AS data 
FROM doctors d
JOIN schedules s ON d.doctor_id=s.doctor_id 
JOIN hours h on s.working_hour = h.id 
WHERE d.doctor_id = 1 AND s.day="Monday"
GROUP BY d.docker_id, s.day;

这需要 MariaDB-10.5。

对于早期版本，GROUP_CONCAT 方法是：

SELECT JSON_OBJECT( 
'name', d.name, 
'day', s.day, 
'schedule', CONCAT('[', GROUP_CONCAT( JSON_OBJECT( 'start', h.start, 'end', h.end ) ) ,']') 
) AS data 
FROM doctors d
JOIN schedules s ON d.doctor_id=s.doctor_id 
JOIN hours h on s.working_hour = h.id 
WHERE d.doctor_id = 1 AND s.day="Monday"
GROUP BY d.docker_id, s.day;

mariadb 查询和使用邮递员的不同输出

Different output from mariadb query and using postman

mysql

json

mariadb

postman