From: Guillaume Lelarge <guillaume@lelarge.info>
To: Mridul Mathew <mridulmathew@gmail.com>
Cc: pgsql-admin@postgresql.org
Subject: Re: PostgreSQL question
Date: Mon, 26 Sep 2011 20:44:50 +0200
Message-ID: <1317062690.2085.1.camel@localhost.localdomain> (raw)
In-Reply-To: <CAFm5QJxD5tThQKXayMRJ1YQ5UR3MaHAcJ4dHE1kd7tYCkj4f6g@mail.gmail.com>
References: <CAFm5QJxD5tThQKXayMRJ1YQ5UR3MaHAcJ4dHE1kd7tYCkj4f6g@mail.gmail.com>
On Mon, 2011-09-26 at 16:06 +0530, Mridul Mathew wrote:
> Hello,
>
> I wanted to take a moment here and reach out to the community with a
> question. How does postgreSQL handle schema switching in the database? I
> have a test scenario.
>
> ##################
>
> vpn2=> show search_path;
> search_path
> -------------
> mridul
> (1 row)
>
> CREATE OR REPLACE PACKAGE mridul.TEST_PKG
> IS
> PROCEDURE execute_for_all_schema();
> end TEST_PKG;
>
> CREATE OR REPLACE PACKAGE BODY mridul.TEST_PKG
> IS
>
> PROCEDURE execute_for_all_schema() IS
>
> CURSOR c_schema_names IS
> SELECT name
> FROM mridul.schema_config
> WHERE status = 'ACTIVE';
>
> BEGIN
>
> FOR dat_schema_names IN c_schema_names LOOP
> ----- EXECUTE IMMEDIATE 'ALTER SESSION SET CURRENT_SCHEMA = '||
> dat_schema_names.name;
> EXECUTE IMMEDIATE 'SET SEARCH_PATH = '|| dat_schema_names.name;
> EXECUTE IMMEDIATE 'insert into A values (1)';
> commit;
> END LOOP;
> EXCEPTION
> WHEN OTHERS THEN
> RAISE;
>
> END;
> end TEST_PKG;
>
> vpn2=> select * from mridul.schema_config;
> id | name | description | status | last_device_sync_date
> ----+-------+-------------+--------+-----------------------
> 1 | TEST | TESTING | ACTIVE | 22-SEP-11 18:28:11
> 6 | TEST1 | TESTING5 | ACTIVE | 22-SEP-11 11:46:09
> 2 | TEST2 | TESTING2 | ACTIVE | 23-SEP-11 11:54:35
> (3 rows)
>
> vpn2=> show search_path;
> search_path
> -------------
> mridul
> (1 row)
>
> vpn2=> select count(*) from test.a;
> count
> -------
> 0
> (1 row)
>
>
> vpn2=> select count(*) from test1.a;
> count
> -------
> 0
> (1 row)
>
>
> vpn2=> select count(*) from test2.a;
> count
> -------
> 0
> (1 row)
>
> vpn2=> exec mridul.TEST_PKG.execute_for_all_schema;
>
> EDB-SPL Procedure successfully completed
> vpn2=> select count(*) from test.a;
> count
> -------
> 1
> (1 row)
>
>
> vpn2=> select count(*) from test1.a;
> count
> -------
> 1
> (1 row)
>
>
> vpn2=> select count(*) from test2.a;
> count
> -------
> 1
> (1 row)
>
> If I convert the 'insert into A ...' part from a dynamic dml to a normal
> insert, and then execute the procedure, there are 3 rows inserted into
> test.a and none go into test1.a nor test2.a. However, if I echo the
> search_path after executing the proc, it displays the last schema's name
> (meaning, it has switched the schemas, but the insert has gone into only the
> first schema).
>
This isn't a PostgreSQL question, this is an EnterpriseDB one. Packages
are not part of the community PostgreSQL distribution. "EXECUTE
IMMEDIATE" is also not part of the community PostgreSQL distribution.
So I guess you need to ask them.
--
Guillaume
http://blog.guillaume.lelarge.infohttp://www.dalibo.com
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To: pgsql-admin@postgresql.org
Cc: guillaume@lelarge.info, mridulmathew@gmail.com
Subject: Re: PostgreSQL question
In-Reply-To: <1317062690.2085.1.camel@localhost.localdomain>
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