odbc_pconnect

(PHP 4, PHP 5)

odbc_pconnect Öffnet eine persistente Datenbankverbindung

Beschreibung

int odbc_pconnect ( string $dsn , string $user , string $password [, int $ cursor_type ] )

Gibt eine ODBC-Verbindungskennung zurück, bei einem Fehler 0 (FALSE). Diese Funktion ist odbc_connect() sehr ähnlich. Der einzige Unterschied besteht darin, dass die Verbindung nach dem Ende des Skriptes erhalten bleibt. Folgende Verbindungen mit gleicher Datenquelle, Nutzer und Passwort-Kombination über odbc_connect() oder odbc_pconnect() können dann die bestehende Verbindung weiterbenutzen.

Hinweis: Persistente Verbindungen können bei einem CGI-PHP nicht benutzt werden. In diesem Fall entspricht odbc_pconnect() odbc_connect().

Für weitere Informationen über den optionalen Parameter cursor_type schauen Sie bitte bei odbc_connect(). Weitere Informationen über persistente Datenbankverbindungen finden Sie in der PHP-FAQ

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User Contributed Notes 4 notes

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alberici at to dot infn dot it
11 years ago
I saw that closing an ODBC persistent connection opened with odbc_pconnect() with odbc_close() doesnt work. Someone here have proposed using odbc_close_all() but wouldnt that close all persistent connections (also others ones !!!) ? What about catching a persistent handle with odbc_connect() and then closing the connection with odbc_close() ? If there are no available handles (for some reason the last pconn has been closed) this approach opens and close a normal single-script connection. Waiting comments...
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j_schrab at execpc dot com
13 years ago
Ok, learning time.  As I was told by the PHP-DevTeam...


Multiple connections are supported, but when you try to connect with exactly the same parameters, an existing
connection will be reused, leading to the behaviour you see.

You can simply omit the calls to odbc_close() since
connections get closed on script termination anyway or better:
Consider making your connection id a global variable or pass
it to your functions.
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wls at wwco dot com
13 years ago
I found that using  odbc_close($odbchandle)  on a connection opened by odbc_pconnect() causes a warning "not a valid ODBC-Link resource".  So you can't just change odbc_connect() to odbc_pconnect() and expect things to work without warning messages.  However, you can use odbc_close_all() and not get a warning.
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etsai at email dot com
13 years ago
The following constants are defined for cursortype:
 - SQL_CUR_USE_IF_NEEDED
 - SQL_CUR_USE_ODBC
 - SQL_CUR_USE_DRIVER
 - SQL_CUR_DEFAULT

With some ODBC drivers, executing a complex stored procedure may fail with an error similar to: "Cannot open a cursor on a stored procedure that has anything other than a single select statement in it". Using SQL_CUR_USE_ODBC may avoid that error. Also, some drivers don't support the optional row_number parameter in odbc_fetch_row(). SQL_CUR_USE_ODBC might help in that case, too.
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