mssql_pconnect

Description

resource mssql_pconnect ( [string servername [, string username [, string password]]] )

Returns: A positive MS SQL persistent link identifier on success, or FALSE on error.

mssql_pconnect() acts very much like mssql_connect() with two major differences.

First, when connecting, the function would first try to find a (persistent) link that's already open with the same host, username and password. If one is found, an identifier for it will be returned instead of opening a new connection.

Second, the connection to the SQL server will not be closed when the execution of the script ends. Instead, the link will remain open for future use (mssql_close() will not close links established by mssql_pconnect()).

This type of links is therefore called 'persistent'.

add a note User Contributed Notes

php at burntpopcorn dot net
11-Mar-2004 10:17


Please note that mssql_pconnect creates a connection for the pool for *each process*. If you have "ThreadsPerChild" set to 50 in apache, and mssql.max_procs set to 25 in php, then eventually you will get mssql_pconnect failing to give you a connection to the database. This has stumped me for quite a while, and the answer finally presented itself thanks to the people in #php.

dave at dontspamme dot com
11-Feb-2004 06:32


If you are running PHP/Apache combination on a Windows machine that is part of a domain, using NT Authentication to connect to a MS SQL Server, you must to do the following things:



1) Turn NT Authentication On (under MSSQL in php.ini)

2) Configure the Apache service to run as the user that is authorized to access the MS SQL server.



Hope this helps save someone the time that it took me to track down!

m1tk4 at hotmail dot com
18-Jul-2002 12:08


Be careful with pconnect!



Platform: RH Linux 7.3, PHP 4.2.1. FreeTDS.



pconnect does give you better time than connect (about 0.25-0.4 seconds gain) BUT:



- occasionally, I've experienced "quirks" when fetch() would randomly return empty recordsets from stored procedurest that can_not return empty recordsets by definition.



- if you restart MSSQL server while some of the connections did not time out, next pconnect() will not establish a new connection! It will return an old one, so next time you do execute() or query() your script will just _hang_ until timeouted by Apache.



All of the above I believe are FreeTDS problems, not PHP. I wonder if somebody with PHP+Sybase lib got pconnect to work.

php at rawhide dot cjb dot net
12-Jul-2001 09:18


One should not that persistent connections are not persistent under a CGI interface.

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