International PHP Conference Berlin 2025

    odbc_pconnect

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

    odbc_pconnect — Open a persistent database connection

    Description

    odbc_pconnect(
        string $dsn,
        string $user,
        string $password,
        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.

    Notes

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

    See Also

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes 3 notes

    up
    2
    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.
    up
    0
    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.
    up
    -4
    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.
    ＋add a note
    To Top