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* Adding custom constraints on a postgres database
@ 2024-02-29 18:09 Debraj Manna <subharaj.manna@gmail.com>
0 siblings, 1 reply; 3+ messages in thread
From: Debraj Manna @ 2024-02-29 18:09 UTC (permalink / raw)
To: pgsql-admin
Can someone let me know if there is a way I can add some custom
rules/constraints on a Postgres database?
For example, all tables in a database should have a primary key specified.
If someone is trying to violate the rules specified then the SQL command
should fail.
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Adding custom constraints on a postgres database
@ 2024-02-29 18:26 David G. Johnston <david.g.johnston@gmail.com>
parent: Debraj Manna <subharaj.manna@gmail.com>
0 siblings, 1 reply; 3+ messages in thread
From: David G. Johnston @ 2024-02-29 18:26 UTC (permalink / raw)
To: Debraj Manna <subharaj.manna@gmail.com>; +Cc: pgsql-admin
On Thu, Feb 29, 2024, 11:10 Debraj Manna <subharaj.manna@gmail.com> wrote:
> Can someone let me know if there is a way I can add some custom
> rules/constraints on a Postgres database?
>
> For example, all tables in a database should have a primary key specified.
> If someone is trying to violate the rules specified then the SQL command
> should fail.
>
https://www.postgresql.org/docs/current/event-trigger-definition.html
David J.
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Adding custom constraints on a postgres database
@ 2024-02-29 18:35 Tom Lane <tgl@sss.pgh.pa.us>
parent: David G. Johnston <david.g.johnston@gmail.com>
0 siblings, 0 replies; 3+ messages in thread
From: Tom Lane @ 2024-02-29 18:35 UTC (permalink / raw)
To: David G. Johnston <david.g.johnston@gmail.com>; +Cc: Debraj Manna <subharaj.manna@gmail.com>; pgsql-admin
"David G. Johnston" <david.g.johnston@gmail.com> writes:
> On Thu, Feb 29, 2024, 11:10 Debraj Manna <subharaj.manna@gmail.com> wrote:
>> Can someone let me know if there is a way I can add some custom
>> rules/constraints on a Postgres database?
>>
>> For example, all tables in a database should have a primary key specified.
>> If someone is trying to violate the rules specified then the SQL command
>> should fail.
> https://www.postgresql.org/docs/current/event-trigger-definition.html
When/where are you expecting to enforce this? If you prohibit the
common pattern of CREATE TABLE followed sometime later by ALTER TABLE
ADD PRIMARY KEY, you will soon regret that.
I think you might be better served by writing a lint-like thing
that can be run periodically to look through the system catalogs
for policy violations. Rejecting SQL commands on-the-fly will be
expensive, as well as painful to work with.
regards, tom lane
^ permalink raw reply [nested|flat] 3+ messages in thread
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2024-02-29 18:09 Adding custom constraints on a postgres database Debraj Manna <subharaj.manna@gmail.com>
2024-02-29 18:26 ` David G. Johnston <david.g.johnston@gmail.com>
2024-02-29 18:35 ` Tom Lane <tgl@sss.pgh.pa.us>
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