odbc_pconnect

Open a persistent database connection (PHP 4, PHP 5)
resource odbc_pconnect ( string dsn, string user, string password [, int cursor_type] )

Examples ( Source code ) » odbc_pconnect


<?


                $dbname="census";

    $username="informix";

    $password="useyourpassword";

    // odbc_pconnect returns 0 if the connection attempt fails

        // otherwise it returns a connection ID used by other ODBC functions

//                echo ( "attempt connect.....\n " );

        $conn = odbc_pconnect ( $dbname, $username, $password );


        if ( $conn == 0 ) {

                echo ( "Connection to database failed." );

                //If connection failed, show what the error message was:

                $sqlerror = odbc_errormsg ( $conn );

                die($sqlerror);

        }

    $sql = "select longitude,latitude,zip from census_data where zip = '$newloc'";

    $locResult=odbc_exec($conn,$sql);

    $locData=odbc_fetch_object($locResult);



?>

Code Examples / Notes » odbc_pconnect

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.

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.

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...

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.

odbc_pconnect

Open a persistent database connection (PHP 4, PHP 5) resource odbc_pconnect ( string dsn, string user, string password [, int cursor_type] )

Code Examples / Notes » odbc_pconnect

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Open a persistent database connection (PHP 4, PHP 5)
resource odbc_pconnect ( string dsn, string user, string password [, int cursor_type] )