[ShopSuite-dev] NOTIFY tableX, LISTEN tableX, pool Nofities()

[Davi Leal]

I am developing an n-tier application which uses postgresql 7.2. It has several 
windows to show Data Base data. If the DB modifies its data then some or each 
window must update the showed information. To realize it the DB send "NOTIFY 
<table X changed>".

The problem is that if a window catch a "NOTIFY table1", another window of the 
same process, which must update too the table1's information, does not update 
due to the asynchronous notification to this backend has already been processed.

Must I use a thread to each application's window?.

Must I do a central collect of notifies and raise the update of windows from 
there?. Yes, I think so.  :-)   However, I need to know the exact type of 
notify which the backend gets: "NOTIFY table1",  "NOTIFY table2", or ...

How could I differentiate from several types of "NOTIFY tableX" ?.

Which are the fields of the PGnotify* PgDatabase::Notifies() ?.


Note: You can see attached examples as C or C++ code which catch the NOTIFY 
from the data base doing a pool. To compile it on Debian GNU/Linux (sid) you 
can do:
gcc -o testlibpq2-C testlibpq2.c -I /usr/include/postgresql/ -lpq
g++ -o testlibpq2-C++ testlibpq2.cpp -I /usr/include/postgresql/ -lpq++


Regards,
Davi Leal

testlibpq2.c
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testlibpq2.cpp
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