如何在没有 FROM_UNIXTIME() 函数的情况下将 unix 时间转换为 GMT+8 人类可读日期？
How to convert a unix time to GMT+8 human readable date without FROM_UNIXTIME() function?
由于 mysql Generated Column 无法使用 FROM_UNIXTIME() 作为生成 sql，我如何将 unix 时间转换为 GMT+8 人类可读日期？我失败的例子：
ALTER TABLE just_a_table
ADD COLUMN created_date
CHAR(5)
GENERATED ALWAYS
AS (FROM_UNIXTIME(created_at, "%m/%d"))
STORED;
Since mysql Generated Column can't use FROM_UNIXTIME() as generate sql
???
FROM_UNIXTIME() 是确定性函数。它可以很容易地用于生成的列表达式。
CREATE TABLE just_a_table (created_at BIGINT);
INSERT INTO just_a_table VALUES
(UNIX_TIMESTAMP(NOW() - INTERVAL 1 HOUR)),
(UNIX_TIMESTAMP(NOW() - INTERVAL 2 DAY));
ALTER TABLE just_a_table
ADD COLUMN created_date CHAR(5)
GENERATED ALWAYS AS (FROM_UNIXTIME(created_at, "%m/%d")) STORED;
SELECT * FROM just_a_table
created_at | created_date
---------: | :-----------
1619167553 | 04/23
1618998353 | 04/21
db<>fiddle here
由于 mysql Generated Column 无法使用 FROM_UNIXTIME() 作为生成 sql，我如何将 unix 时间转换为 GMT+8 人类可读日期？我失败的例子：
ALTER TABLE just_a_table
ADD COLUMN created_date
CHAR(5)
GENERATED ALWAYS
AS (FROM_UNIXTIME(created_at, "%m/%d"))
STORED;
Since mysql
Generated Columncan't useFROM_UNIXTIME()as generate sql
???
FROM_UNIXTIME() 是确定性函数。它可以很容易地用于生成的列表达式。
CREATE TABLE just_a_table (created_at BIGINT); INSERT INTO just_a_table VALUES (UNIX_TIMESTAMP(NOW() - INTERVAL 1 HOUR)), (UNIX_TIMESTAMP(NOW() - INTERVAL 2 DAY));
ALTER TABLE just_a_table ADD COLUMN created_date CHAR(5) GENERATED ALWAYS AS (FROM_UNIXTIME(created_at, "%m/%d")) STORED;
SELECT * FROM just_a_tablecreated_at | created_date ---------: | :----------- 1619167553 | 04/23 1618998353 | 04/21
db<>fiddle here