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This allows us to put a stop list together (currently containing only one entry for the public.example.com host) and deny access to connections originating from that server. Using the % wildcard this way in the Db column and in the Host column means that the access control system will always find a match in the host table for any internal example.com server, regardless of the request. Since any privilege columns we leave out in the INSERT statement will default to 'N', we can rest assured that no unintended privileges have been granted. Remember, however, that the MySQL access control system will use privileges in the global mysql.user entry first in the privilege verification process. Therefore, if the account some_user@public.example.com had privileges set to 'Y' at the global level, that entry would override the host table entries.

The technique shown in the previous example works great when you want to perform a single asynchronous task and update the user interface once it completes However, in many situations you ll simply want to take the data that the asynchronous worker provides, and store it somewhere for later use One reason to take this step is to avoid interrupting other work the user is performing For example, consider an application that shows a product catalog in a grid control You might fetch an updated DataSet from a Web service, but you probably don t want to refresh the grid immediately That s because the user might be looking at a specific row, or even performing an edit.

private void btnConnectionPooling_Click(object sender, EventArgs e)

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You can use SQL commands to add and remove user accounts, including several GRANT clauses to place restrictions on accounts. Here, we ll look at those commands. In the next section, we ll cover using the MySQL Administrator GUI tool to manage user accounts.

Instead, a better approach is to provide a message in a status bar informing the user that new data is available, and allow the user to click a button to refresh the grid at the right time The problem with this type of scenario is that you need a place to store the data until you decide to display it A form member variable makes perfect sense for this storage However, it also introduces a new problem thread synchronization The problem is that it s not safe for you to access any data from more than one thread That s because there s a possibility that both the main thread and your asynchronous thread would try to manipulate the same object at the same time, which leads to unpredictable behavior and, occasionally, incorrect or corrupted data There are two ways to resolve this problem: Use the ControlInvoke() method.

The ControlInvoke() method can marshal your code to the main thread, where it s safe to update the form-level variable However, this approach requires a free time slice on the user interface thread, potentially slowing performance It s also awkward to manage if you have several asynchronous tasks taking place at once Use locking This way, you ensure that you gain exclusive access to the variable for a short time If another thread tries to access the same object, it will be forced to wait Locking is easily implemented in C# through the lock statement The lock statement gains exclusive access to any reference type When you use the lock statement, the object is automatically released when you exit the block, even if it s the result of an unhandled error..

As mentioned earlier, you can use the GRANT command to create new user accounts. Any time you issue a GRANT statement for a username and host combination that does not currently exist in the mysql.user table, a new user account is created. A row is inserted in the mysql.user table for the username and host specified in your GRANT statement. If the scope of the privileges granted in the statement is global, the user account s global permissions will be set in this new row and no other tables will receive an entry. If the scope of privileges was below the global scope, a new entry will be inserted in the grant table corresponding to the privilege level. The IDENTIFIED BY clause of the GRANT statement allows you to specify a password for the user account, like so: GRANT SELECT ON ToyStore.* TO 'some_user'@'localhost' IDENTIFIED BY 'my_password';

{ Stopwatch _stopwatch = new Stopwatch(); String _Results; String _connstring = "Data Source=localhost/NEWDB;User Id=EDZEHOO;Password=PASS123;Pooling=false"; try { //Open and close connections 10 times without connection pooling enabled OracleConnection _connObj = new OracleConnection(_connstring); _stopwatch.Start(); for (int i = 1; i <= 10; i++) { _connObj.Open(); _connObj.Close(); } _stopwatch.Stop(); _Results = "Without connection pooling:\t" +

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