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We can illustrate these values with a few examples. The following class always requires a new transaction. Even if the caller already has an active transaction, a new one is always created: [Transaction(TransactionOption.RequiresNew)] public class MyTransactionClass : ServicedComponent { } The following class supports a transaction if one already exists, but it does not require one and will not cause one to be started: [Transaction(TransactionOption.Supported)] public class MyTransactionClass : ServicedComponent { } The following class does not support transactions. If the caller has an active transaction, this object will be created in a different COM+ context: [Transaction(TransactionOption.NotSupported)] public class MyTransactionClass : ServicedComponent { }

The preceding example checks that the incoming value is not null. This is fine, but using the NOT NULL constraint directly is more powerful for application interfaces. The API can inform the client application at Prepare time of a NOT NULL constraint, whereas CHECK validation triggers do not fire until a DML request is actually posted to the server.

For details of STARTING WITH and other SQL operators used in expressions, refer to 21. A domain s CHECK constraint cannot be overridden by one declared during column definition. However, a column can extend its use of the domain s CHECK constraint by adding its own CHECK conditions.

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} } } //Function to add a user to the password file. public function adduser ($user, $pass) { //Make sure a given user does not already exist. try { if ($file = fopen ($this->passpath,"r")){ $proceed = true; //Run through the file. while ($input = fgets ($file, 200)){ $exp = explode (":", $input); //If this user already exists, then you stop right here. if ($user == $exp[0]){ $proceed = false; } } fclose ($file); } else { throw new exception ("Sorry, could not open the password file for reading."); } } catch (exception $e) { echo $e->getmessage(); } try { //If you are good to go, then write to the file. if ($proceed){ try { //Open the password file for appending. if ($file = fopen ($this->passpath,"a")){ //And then append a new username and password. fputs($file,$user . ":" . crypt ($pass) . "\n"); fclose($file); } else { throw new exception ("Error opening the password file for appending"); } } catch (exception $e) { echo $e->getmessage(); } } else { throw new exception ("Sorry, this username already exists."); } } catch (exception $e){ echo $e->getmessage(); }

In tables, CHECK constraints can be defined legally with expressions referring to other columns in the same table or, less desirably, referring to columns in other database objects (tables, stored procedures). Domains, of course, cannot refer to other domains. It is possible, although almost always unwise, to define a domain that refers to a column in an existing table. For example:

create domain rather_silly as char(3) check (value in (select substring(registration from 1 for 3) from aircraft));

The C# code that follows demonstrates the use of the Transaction attribute with different TransactionOption values. The only real purpose of the code is to see the differences in transaction state when each value is used. We start with a simple interface that defines a single test method: using using using using System; System.EnterpriseServices; System.Runtime.InteropServices; TransactionLogging;

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