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Selects query inside function must read commited data

From: "V i s h a l Kashyap (at) [Sai Hertz And Control Systems]" <sank89(at)sancharnet(dot)in>
To: pgsql-admin(at)postgresql(dot)org
Subject: Selects query inside function must read commited data
Date: 2004-01-25 08:51:03
Message-ID: 40138377.2070503@sancharnet.in (view raw or flat)
Thread:
Lists: pgsql-admin
Dear all ,

Would like to receive your kind attention and enormous knowledge on the 
following

I have a function
sai_func_a()
Which does as follows and in the same order:
1. Retrieves the latest record from the table test_sai
   (By latest I mean the record corresponding to max primary key of the 
table)
2. Increments date as received from test_sai.current_date
   as my_new_date := test_sai.current_date + 1 ;
3. Inserts the new date into the same table test_sai
4. Calls another function sai_func_b()
   Now inside sai_func_b()
   1. Does as #1 of above
   2. Works on the date in the last record.
   3. Returns success code to sai_func_a()
5. The sai_func_a() finishes the work

Now My question :
Since sai_func_a() which encapsulates the function sai_func_b has not 
completed yet till #4 or #5
then how does the function sai_func_b reads the new data since it is not 
committed yet.

If I am not wrong PostgreSQL select statements works on committed data 
thus the new
inserted data at #3 must not be available to sai_func_b() till #5

Server Specs:
1. version
---------------------------------------------------------------------------------------------------------
PostgreSQL 7.3.4 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.2.2 
20030222 (Red Hat Linux 3.2.2-5)
2.Both functions are plpgsql and are not triggers



If you need more information kindly ask for the same.


-- 
Regards,
Vishal Kashyap

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and my Girlfriend knows me because of my CASH.
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