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Table constraints are a means by which the database can enforce business rules and guarantee that the data conforms to the entity-relationship model determined by the systems analysis that defines the application data structures For example, the business analysts of your organization may have decided that every customer and every order must be uniquely identifiable by number, that no orders can be issued to a customer before that customer has been created, and that every order must have a valid date and a value greater than zero These would implemented by creating primary key constraints on the CUSTOMER_ID column of the CUSTOMERS table and the ORDER_ID column of the ORDERS table, a foreign key constraint on the ORDERS table referencing the CUSTOMERS table, a not-null constraint on the DATE column of the ORDERS table (the DATE data type will itself ensure that that any dates are valid automatically it will not accept invalid dates), and a check constraint on the ORDER_AMOUNT column on the ORDERS table If any DML executed against a table with constraints defined violates a constraint, then the whole statement will be rolled back automatically Remember that a DML statement that affects many rows might partially succeed before it hits a constraint problem with a particular row If the statement is part of a multistatement transaction, then the statements that have already succeeded will remain intact but uncommitted EXAM TIP A constraint violation will force an automatic rollback of the entire statement that hit the problem, not just the single action within the statement, and not the entire transaction

The easiest way to report an error within a subroutine is to return the undefined value undef this is universally accepted within Perl as notification of some form of failure and is also identified by any testing mechanism as a false (and therefore failure) value If you want to report the error directly within the function, then use die (see s 7 and 9) or use the carp function from the Carp module (see Appendix B)

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DirectoryNode has two constructors. The first creates the top-level directory, and the other creates a DirectoryNode from a DirectoryInfo object. The Populate() function is the heart of the class. It uses the DirectoryInfo object that s encapsulated, calling GetFiles() to get the list of files in the directory and GetDirectories() to get the list of directories. It then recurses for each subdirectory, so the directory tree can be fully traversed. The PrintTree() function is used for testing, along with a little test program: class Test { public static void Main() { DirectoryNode directoryNode = new DirectoryNode(@"c:\project\diskdiff"); directoryNode.Populate(); directoryNode.PrintTree(0); } } On our system, this gives the following output: c:\project\diskdiff c:\project\diskdiff\bin c:\project\diskdiff\bin\Debug c:\project\diskdiff\obj c:\project\diskdiff\obj\Debug c:\project\diskdiff\obj\Debug\temp c:\project\diskdiff\obj\Debug\TempPE

The context of a subroutine or statement is defined as the type of return value that is expected This allows you to use a single function that returns different values based on what the user is expecting to receive For example, the following two calls to the getpwent function return a list or a scalar, according to what was used in the assignation:

NVL A function that returns either the original item unchanged or an alternative item if the initial term is null NVL2 A function that returns a new if-null item if the original item is null or an alternative if-not-null item if the original term is not null

$name = getpwent(); ($name, $passwd, $uid, $gid, $quota, $comment, %gcos, $dir, $shell) = getpwent();

OC4J Oracle Containers for J2EE The control structure provided by the Oracle Internet Application Server for running Java programs OCA Oracle Certified Associate

In the first case, the user expects a scalar value to be returned by the function, because that is what the return value is being assigned to In the second case, the user expects an array as the return value, again because a list of scalars has been specified for the information to be inserted into This can be confusing, since most other languages support only one type of return value In fact, it s very practical, because it reduces the amount of code required to achieve different results Here s another example, again from the built-in Perl functions, that shows the flexibility:

my $timestr = localtime(time);

OCI Oracle Call Interface An API, published as a set of C libraries, that programmers can use to write user processes that will use an Oracle database OCP Oracle Certified Professional The qualification you are working toward at the moment ODBC Open Database Connectivity A standard developed by Microsoft for communicating with relational databases Oracle provides an ODBC driver that will allow clients running Microsoft products to connect to an Oracle database offline backup A backup made while the database is closed OLAP Online analytical processing Selection-intensive work involving running queries against a (usually) large database Oracle provides OLAP capabilities as an option, in addition to the standard query facilities OLTP Online transaction processing A pattern of activity within a database typified by a large number of small, short transactions online backup A backup made while the database is open online redo log The files to which change vectors are streamed by the LGWR Oracle Net Oracle s proprietary communications protocol, layered on top of an industry-standard protocol ORACLE_BASE ORACLE_HOME The root directory into which Oracle products are installed The root directory of any one Oracle product

In this example, the value of $timestr is now a string made up of the current date and time, for example, Thu Nov 30 15:21:33 2000 Conversely,

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