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Perl provides a built-in random number generator All random numbers need a seed value, which is used in an algorithm, usually based on the precision, or lack thereof, for a specific calculation The format for the rand function is

It is not possible to make a constraint deferrable later, if it was not created that way The constraint SA_NN1 will by default be enforced when a row is inserted (or updated), but the check can be postponed until the transaction commits A common use for deferrable constraints is with foreign keys If a process inserts or updates rows in both the parent and the child tables, if the foreign key constraint is not deferred the process may fail if rows are not processed in the correct order Changing the status of a constraint between ENABLED/DISABLED and VALIDATE/ NOVALIDATE is an operation that will affect all sessions The status change is a data dictionary update Switching a deferrable constraint between IMMEDIATE and DEFERRED is session specific, though the initial state will apply to all sessions EXAM TIP By default, constraints are enabled and validated, and they are not deferrable

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The compiler-support tags are a good example of compiler magic; they re processed using information that s known only to the compiler. The following example illustrates how to use the support tags: // file: employee.cs using System; namespace Payroll { /// /// /// /// <summary> The Employee class holds data about an employee. This class contains a <see cref="String">string</see> </summary>

The function returns a floating-point random number between 0 and EXPR or between 0 and 1 (including 0, but not including 1) if EXPR is not specified If you want

Exercise 7-6: Manage Constraints In this exercise, use SQL Developer and SQL*Plus to define and adjust some constraints on the table created in Exercise 7-3 1 In SQL Developer, navigate to the listing of WEBSTORE s tables and click the CUSTOMERS table 2 Take the Constraints tab to view the four NOT NULL constraints that were created with the table Note that their names are not helpful this will be fixed in Step 8 3 Click the Actions button and choose Constraints: Add Primary Key 4 In the Add Primary Key window name the constraint: PK_CUSTOMER_ID, choose the CUSTOMER_ID column, and click Apply 5 Choose the Show SQL tab to see the constraint creation statement, and then click the Apply button to run the statement 6 Connect to your database as user WEBSTORE with SQL*Plus 7 Run this query to find the names of the constraints:

8:

an integer random number, just use the int function to return a reasonable value, as in this example:

select constraint_name,constraint_type,column_name from user_constraints natural join user_cons_columns where table_name='CUSTOMERS';

print int(rand(16)),"\n";

8 Rename the constraints to something more meaningful, using the original constraint names retrieved in Step 7, with ALTER TABLE commands:

You can use the srand function to seed the random number generator with a specific value:

CHAPTER 38 DEEPER INTO C#

The rand function automatically calls the srand function the first time rand is called, if you don t specifically seed the random number generator The default seed value is the value returned by the time function, which returns the number of seconds from the epoch (usually January 1, 1970 UTC although it s dependent on your platform) The problem is that this is not a good seed number because its value is predictable Instead, you might want to try a calculation based on a combination of the current time, the current process ID, and perhaps the user ID, to seed the generator with an unpredictable value I ve used the following calculation as a good seed, although it s far from perfect:

ALTER TABLE CUSTOMERS RENAME CONSTRAINT old_name TO new_name ;

srand((time() ^ (time() % $])) ^ exp(length($0))**$$);

9 Add the following constraints to the WEBSTORE schema:

By mixing the unpredictable values of the current time and process ID with predictable values, such as the length of the current script and the Perl version number, you should get a reasonable seed value The following program calculates the number of random numbers generated before a duplicate value is returned:

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