這可能是更好的存儲公司限制另一個表。 這正是RDBMS的用途。
如果你真的需要使用JSON,你可能需要解析它。在postgres中可能會有一些JSON函數可用,但對數組來說似乎很麻煩,並且您將無法使用SQL查詢數據。
CREATE TABLE t_user (
id SERIAL PRIMARY KEY NOT NULL,
name CHARACTER VARYING(256) NOT NULL
);
CREATE UNIQUE INDEX t_user_idx ON t_users(name);
CREATE TABLE t_company (
id SERIAL PRIMARY KEY NOT NULL,
name CHARACTER VARYING(256) NOT NULL
);
CREATE UNIQUE INDEX t_company_idx ON t_company(name);
CREATE TABLE t_company_restriction (
id SERIAL PRIMARY KEY NOT NULL,
id_company integer NOT NULL REFERENCES t_company(id) ON DELETE CASCADE,
id_user integer NOT NULL REFERENCES t_user(id) ON DELETE CASCADE
);
CREATE UNIQUE INDEX t_company_restriction_idx ON t_company_restriction(id_company, id_user);
INSERT INTO t_user(name) VALUES ('Bill');
INSERT INTO t_user(name) VALUES ('Fred');
INSERT INTO t_company (name) VALUES ('Company 1');
INSERT INTO t_company (name) VALUES ('Company 2');
INSERT INTO t_company (name) VALUES ('Company 3');
INSERT INTO t_company (name) VALUES ('Company 4');
INSERT INTO t_company_restriction (id_user, id_company)
SELECT u.id, c.id FROM t_user u, t_company c
WHERE u.name = 'Bill' AND c.name = 'Company 1';
INSERT INTO t_company_restriction (id_user, id_company)
SELECT u.id, c.id FROM t_user u, t_company c
WHERE u.name = 'Bill' AND c.name = 'Company 2';
INSERT INTO t_company_restriction (id_user, id_company)
SELECT u.id, c.id FROM t_user u, t_company c
WHERE u.name = 'Fred' AND c.name = 'Company 3';
INSERT INTO t_company_restriction (id_user, id_company)
SELECT u.id, c.id FROM t_user u, t_company c
WHERE u.name = 'Fred' AND c.name = 'Company 4';
SELECT u.name
FROM t_user u, t_company c, t_company_restriction cr
WHERE c.name = 'Company 1'
AND c.id = cr.id_company
AND u.id = cr.id_user;
由於錯誤提示:您不能在JSONB列上使用數組運算符。沒有用於測試JSONB列內數組內的元素的等價函數。如果你想存儲的只是一個數組,那你爲什麼不使用數組? –
我沒有看到Postgres的數組數據類型,有沒有一個?這叫什麼? – Jordash
https://www.postgresql.org/docs/current/static/arrays.html –