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Listing 5-13 shows the processItemsOrder() function. Listing 5-13. The processItemsOrder() Function, Which Takes the New List Order from the Post Data and Saves It to the Database (items.php) function processItemsOrder($key) { if (!isset($_POST[$key]) || !is_array($_POST[$key])) return false; $items = getItems(); $ranking = 1; foreach ($_POST[$key] as $id) { if (!array_key_exists($id, $items)) continue; $query = sprintf('update items set ranking = %d where item_id = %d', $ranking, $id); mysql_query($query); $ranking++; } return true; } >

When connecting to a database, several time-consuming tasks must be performed before the connection can be classed as open. A physical connection to the database is created, the login details parsed and authenticated against the database, and so on. If this occurred every time you connected to the database, the connection preparation time soon mounts up. In your Web site, you will probably use a limited number of different databases, or maybe only one database. This is where connection pooling can help. Connection pooling works under the covers and creates a pool of connections that are used when you call the Open() method on the Connection object. When you call the Open() method, the data provider will look to see if there are any connections in the pool. If there are, then a pooled connection will be reused. If not, the data provider will create a new connection to the database. On closing the connection with the Close() method, the connection will not actually be closed yet. It will be returned to the pool to be used again on another call to the Open() method. So how do you enable connection pooling The answer is you don t. If your data provider supports connection pooling, it will be enabled by default. But it does depend on which data provider you re using: The SqlClient data provider uses connection pooling for all connections to the database. The OleDb data provider will use connection pooling if the underlying OLE DB provider supports it. Connection pooling for ODBC drivers is controlled at the ODBC level and not within the Odbc data provider. If the ODBC driver has connection pooling enabled, it will be enabled.

s Note Profile properties behave like any other class member variable. This means if you read a profile

value that hasn t been set, you ll get a default initialized value (such as an empty string or 0).

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