Metodou „eazy“ je použití CONCAT ke generování JSON.
A pomocí GROUP_CONCAT zkombinujte záznamy více týmů do pole JSON.
Tato metoda funguje také ve starších verzích MySQL, které nepodporují funkce vytváření JSON.
Dotaz
SET SESSION group_concat_max_len = @@max_allowed_packet
SELECT
CONCAT(
"{"
, '"id"' , ":" , '"' , friends.id , '"' , ","
, '"name"' , ":" , '"' , friends.name , '"' , ","
, '"team"' , ":" , "["
, GROUP_CONCAT('"', teams.name, '"')
, "]"
, "}"
) AS json
FROM
friends
INNER JOIN
relations
ON
friends.id = relations.friends_id
INNER JOIN
teams
ON
relations.teams_id = teams.id
WHERE
friends.id = 1
Výsledek
| json |
|-----------------------------------------------------------------|
| {"id":"1","name":"David Belton","team":["Cleveland Cavaliers"]} |
ukázka
http://www.sqlfiddle.com/#!9/4cd244/19
Upravili více přátel
Dotaz
SET SESSION group_concat_max_len = @@max_allowed_packet
SELECT
CONCAT(
"["
, GROUP_CONCAT(json_records.json) # combine json records into a string
, "]"
) AS json
FROM (
SELECT
CONCAT(
"{"
, '"id"' , ":" , '"' , friends.id , '"' , ","
, '"name"' , ":" , '"' , friends.name , '"' , ","
, '"team"' , ":" , "["
, GROUP_CONCAT('"', teams.name, '"')
, "]"
, "}"
) AS json
FROM
friends
INNER JOIN
relations
ON
friends.id = relations.friends_id
INNER JOIN
teams
ON
relations.teams_id = teams.id
WHERE
friends.id IN(SELECT id FROM friends) #select the friends you need or just simply friends.id IN(1, 2)
GROUP BY
friends.id
)
AS json_records
Výsledek
| json |
|--------------------------------------------------------------------------------------------------------------------------------------------------|
| [{"id":"1","name":"David Belton","team":["Cleveland Cavaliers"]},{"id":"2","name":"Alex James","team":["Boston Celtics","Cleveland Cavaliers"]}] |
ukázka
http://www.sqlfiddle.com/#!9/4cd244/61