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.
mssql_pconnect
説明
resource mssql_pconnect ( [string servername [, string username [, string password [, bool new_link]]]] )返り値: 成功時に正の MS SQL 持続的リンク ID、エラー時に FALSE。
mssql_pconnect() は mssql_connect() とほとんど同じく動作しますが、違う点が 2 つあります。
第 1 に、この関数は接続時に同じホスト、ユーザ名、パスワードで既に オープンされている(持続的)リンクを探そうとします。 もし見つかった場合、新規の接続をオープンせずにその ID を返します。
第 2 に、SQL サーバはスクリプトの実行終了時に接続を閉じません。 代わりに、リンクは後に使用されるためにオープンされたままとします (mssql_close() は mssql_pconnect() により確立されたリンクを閉じません)。
この型のリンクはこのため '持続的である' と呼ばれます。
mssql_pconnect
php at burntpopcorn dot net
11-Mar-2004 11:17
11-Mar-2004 11:17
dave at dontspamme dot com
11-Feb-2004 07:32
11-Feb-2004 07:32
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 01:08
18-Jul-2002 01:08
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 10:18
12-Jul-2001 10:18
One should not that persistent connections are not persistent under a CGI interface.