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

odbc_pconnectAbrir una conexión persistente a una base de datos


    string $dsn,
    string $user,
    string $password,
    int $cursor_type = ?
): resource

Abre una conexión persistente a una base de datos.

Esta función es como odbc_connect(), excepto que la conexión no se cierra en realidad cuando el script finaliza. Futuras consultas para una conexión con la misma combinación de dsn, user, password (mediante odbc_connect() y odbc_pconnect()) pueden reusar la conexión persistente.


Véase odbc_connect() para más detalles.

Valores devueltos

Devuelve un identificador de conexión ODBCo 0 (false) si se produjo un error.


Nota: Las conexiones persistentes no tienen efecto si PHP se usa como programa CGI.

Ver también

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User Contributed Notes 4 notes

etsai at email dot com
23 years ago
The following constants are defined for cursortype:

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.
wls at wwco dot com
23 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.
j_schrab at execpc dot com
23 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.
alberici at to dot infn dot it
21 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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