mysql - 尝试在 View 创建中添加更新

Question

我在基表 test1 上创建了一个 View ，并在创建时在其中添加了两列。

create or replace force view abc1 as (select A.*,cast(NULL as timestamp) AS new1,cast(NULL as varchar2) AS new2 from test1 A);

创建 View 后，它的数据如下:

从abc1中选择*；

TT            | TT_C2                 | TT_DAY     | TT_HOURLY     | OC   | SEV      | EXTRACOL | IDENTIFIER | NEW1 | NEW2
1468309423961 | 2016-07-12 07:43:43.0 | 12-07-2016 | 12-07-2016 07 | abc  | Critical | asdf     | 1          | null | null
1468922692865 | 2016-07-19 10:04:52.0 | 19-07-2016 | 19-07-2016 10 | abc  | Critical | asdf     | 1          | null | null
1568308812001 | 2019-09-12 17:20:12.0 | 12-09-2019 | 12-09-2019 17 | abc1 | Major    | asdf     | 1          | null | null
1468308812001 | 2016-07-12 07:33:32.0 | 12-07-2016 | 12-07-2016 07 | abc2 | Minor    | asdf     | 1          | null | null
1468308815972 | 2016-07-12 07:33:35.0 | 12-07-2016 | 12-07-2016 07 | abc  | Critical | asdf     | 1          | null | null

现在我正在尝试更新属于 timestmap 数据类型的 new1 列，但由于某些限制我无法更新 View ..

update view abc1 set new1 = DATEADD('SECOND', (TT)/1000), DATE '1970-01-01') WHERE new1 IS NULL;

出现的错误是::

Syntax error in SQL statement "UPDATE ABC1 SET NEW1 = DATEADD('SECOND', (TT)/1000)[*], DATE '1970-01-01') WHERE NEW1 IS NULL "; expected "[, ::, *, /, %, +, -, ||, ~, !~, NOT, LIKE, REGEXP, IS, IN, BETWEEN, AND, OR, ,"; SQL statement:
update abc1 set new1 = DATEADD('SECOND', (TT)/1000), DATE '1970-01-01') WHERE new1 IS NULL [42001-176]

如何将更新“new1”列查询添加到 View 创建中，以便仅在 View 创建期间解决此问题。

这是我的基表::

TT            | TT_C2                 | TT_DAY     | TT_HOURLY     | OC   | SEV      | EXTRACOL | IDENTIFIER
1468309423961 | 2016-07-12 07:43:43.0 | 12-07-2016 | 12-07-2016 07 | abc  | Critical | asdf     | 1
1468922692865 | 2016-07-19 10:04:52.0 | 19-07-2016 | 19-07-2016 10 | abc  | Critical | asdf     | 1
1568308812001 | 2019-09-12 17:20:12.0 | 12-09-2019 | 12-09-2019 17 | abc1 | Major    | asdf     | 1
1468308812001 | 2016-07-12 07:33:32.0 | 12-07-2016 | 12-07-2016 07 | abc2 | Minor    | asdf     | 1
1468308815972 | 2016-07-12 07:33:35.0 | 12-07-2016 | 12-07-2016 07 | abc  | Critical | asdf     | 1

提前致谢!

问候

Answer 1

理想情况下，您不应更新 View 。

根据您的要求，您必须使用包装器来获取列(即选择选择)。

 create or replace force view abc7 as (select tt,oc,sev, converted_event_time,formatdatetime(converted_event_time,'d-MM-yyyy HH') ,formatdatetime(converted_event_time,'d-MM-yyyy') AS event_time_day from (select tt,oc,sev,DATEADD('SECOND', (tt)/1000, DATE '1970-01-01') AS converted_event_time from test1));

希望您觉得这个答案有用。