odbc_pconnect

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

odbc_pconnect — Abrir una conexión persistente a una base de datos

Descripción

odbc_pconnect(
    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.

Parámetros

Véase odbc_connect() para más detalles.

Valores devueltos

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

Notas

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

Ver también

odbc_connect() - Conectar a una fuente de datos
Conexiones Persistentes a Bases de Datos

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User Contributed Notes 4 notes

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etsai at email dot com ¶

24 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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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.

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wls at wwco dot com ¶

24 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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-1

alberici at to dot infn dot it ¶

22 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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