PostgreSQL question

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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).

Thanks in advance!

-Mridul.



[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]

  Powered by Linux