odbc_pconnect

(PHP 4, PHP 5, PHP 7, PHP 8)

odbc_pconnect — Apre una connessione persistente verso un database

Descrizione

odbc_pconnect(
    string $dsn,
    string $utente,
    string $password,
    int $tipo_cursore = ?
): resource

Restituisce un identificatore di connessione ODBC oppure 0 (false) su errore. Questa funzione è molto simile a odbc_connect(), eccetto che la connessione non viene realmente chiusa quando lo script finisce. Successive richieste di connessione che utilizzino la stessa combinazione di dsn, utente, password (eseguite sia utilizzando odbc_connect(), sia utilizzando odbc_pconnect()) possono riutilizzare la connessione.

Nota: Le connessioni persistenti non hanno effetti se PHP viene utilizzato come programma CGI.

Per informazioni sul campo opzionale tipo_cursore, vedere la funzione odbc_connect(). Per maggiori dettagli sulle connessioni persistenti, fare riferimento alla FAQ di PHP.

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User Contributed Notes 3 notes

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etsai at email dot com ¶

25 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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wls at wwco dot com ¶

25 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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-4

j_schrab at execpc dot com ¶

24 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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