odbc_pconnect

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

    odbc_pconnect — Open a persistent database connection

    Description

    odbc_pconnect(
        string $dsn,
        ?string $user = null,
        ?string $password = null,
        int $cursor_option = SQL_CUR_USE_DRIVER
    ): Odbc\Connection|false

    Opens a persistent database connection.

    This function is much like odbc_connect(), except that the connection is not really closed when the script has finished. Future requests for a connection with the same dsn, user, password combination (via odbc_connect() and odbc_pconnect()) can reuse the persistent connection.

    Parameters

    See odbc_connect() for details.

    Return Values

    Returns an ODBC connection, or false on failure.

    Changelog

    Version Description
    8.4.0 odbc expects an Odbc\Connection instance now; previously, a resource was expected.
    8.4.0 This function returns a Odbc\Connection instance now; previously, a resource was returned.
    8.4.0 user and password are now nullable, they are now also optional and default to null.
    8.4.0 Previously, using an empty string for password would not include pwd in the generated connection string for dsn. It is now generated to include a pwd which has an empty string as its value. To restore the previous behaviour password can now be set to null.
    8.4.0 Previously, if dsn contained uid or pwd both user and password parameters were ignored. Now user is only ignored if dsn contains uid, and password is only ignored if dsn contains pwd.

    Notes

    Note: Persistent connections have no effect if PHP is used as a CGI program.

    See Also

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    User Contributed Notes 3 notes

    up
    2
    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.
    up
    0
    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.
    up
    -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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