Re: schema agnostic functions in language sql

From: Rob Sargent <robjsargent(at)gmail(dot)com>
To: Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com>, pgsql-general(at)lists(dot)postgresql(dot)org
Subject: Re: schema agnostic functions in language sql
Date: 2020-05-15 22:53:34
Message-ID: 92aa43c7-6b96-ab7f-ddde-61346f957801@gmail.com
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On 5/15/20 4:43 PM, Adrian Klaver wrote:
> On 5/15/20 3:26 PM, Rob Sargent wrote:
>> I'm using postgres 12.2, with multiple identical schema per database
>> (each with a matching role).  I can write public plpgsql functions
>> without using a schema identifier and let the runtime search_path
>> find the correct schema-dependent table.  The same does not appear to
>> be true for plain sql functions.  The 'parser'? does not recognize
>> the tables (sans schema qualifier):
>>
>>     ERROR:  relation "<tablename>" does not exist.
>
> You probably need to show example code, because I don't see this:
>
> show search_path ;
>                            search_path
> ------------------------------------------------------------------
>  public,accounting,history,main,utility,timeclock,table_templates
>
> \d utility.login_info
>                                Table "utility.login_info"
>    Column    |              Type              | Collation | Nullable |
>    Default
> -------------+--------------------------------+-----------+----------+------------------
>
>  user_name   | character varying              | | not null |
>  user_pwd    | character varying              | | not null |
>  user_role   | character varying              | |          |
>  ts_insert   | timestamp(0) without time zone | |          | now()
>  ts_update   | timestamp(0) without time zone | |          |
>  user_update | character varying(20)          | |          |
>  user_insert | character varying(20)          | |          |
> "session_user"()
>
>
> CREATE FUNCTION getli(varchar) RETURNS login_info AS $$
>     SELECT * FROM login_info WHERE user_name = $1;
> $$ LANGUAGE SQL;
>
> select * from getli('aklaver');
>  user_name | user_pwd | user_role |      ts_insert      |
> ts_update      | user_update | user_insert
> -----------+----------+-----------+---------------------+---------------------+-------------+-------------
>
>  aklaver   | ranger   |           | 12/29/2012 12:23:17 | 05/15/2020
> 15:41:14 |             | postgres
> (1 row)
>
Isn't "utility" in your path above?
>
>>
>> I would rather not have to duplicate these across multiple schema -
>> I'll use plpgsql instead unless I've overlooked some other avenue.
>>
>> I've found that I can create the function, in public, if I set the
>> search_path containing one schema (of course) and then successfully
>> access the function after resetting the search path to use a second
>> schema.  My "build the world" scripting has so far avoided needing to
>> know/use any specific role.  Another pipe dream vaporized?
>>
>> Thanks,
>> rjs
>>
>>
>
>

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