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The addition of table constraints can be deferred. It is a common practice for developers to define all of their tables without any table constraints and to add them subsequently, using a separate script. The rationale behind this practice is good: Large scripts notoriously fail because the author overlooked some dependency. It simply causes fewer headaches to build databases in a sequence that eliminates the time and spleen spent on patching dependency errors and rerunning scripts. Typically, in the first script, we declare and commit the tables:

CREATE TABLE ATABLE ( ID BIGINT NOT NULL, ANOTHER_COLUMN VARCHAR(20), < more columns > ); CREATE TABLE ANOTHERTABLE ( ... ); ... COMMIT; ALTER TABLE ATABLE ADD CONSTRAINT PK_ATABLE PRIMARY KEY(ID); ALTER TABLE ANOTHERTABLE...

and so on. In the next chapter, when exploring FOREIGN KEY definitions, the benefits of building databases in a dependency-safe sequence will become obvious.

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In this example, a simple class defines two members. One is defined as a const, and the other is defined as a static. Both members can be accessed with the name of the class and two colons and the name of the member. As for normal PHP constants, the const members of a class are read-only. myclass::MYCONST = 123 myclass::$value = 567 Note how the constant definition automatically is considered a static member of the class (only one copy will be stored in memory for all instances of the class) and how the static modifier is used without a public, private, or protected keyword. This makes the variable public. If the variable was defined as private static, it would not be possible to access it directly, as shown in the next example.

A CHECK constraint is used for validating incoming data values. It enforces a match condition or requirement that a value must meet in order for an insert or update to succeed. It cannot change the incoming value; it will return a validation exception if the input fails the check.

The assembly also contains these attributes: uses System.EnterpriseServices; [assembly: [assembly: [assembly: [assembly: ApplicationActivation(ActivationOption.Server)] ApplicationAccessControl(false)] ApplicationName("DniServerApplication")] Description(".NET Interop Server Application")]

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CHECK constraints are applied after before triggers have fired. Use a trigger when you need to perform a validation and conditionally change it to a valid one.

< php // Example 10-5-9.php class myclass { const MYCONST = 123; private static $value = 567; } echo 'myclass::MYCONST = ' . myclass::MYCONST . "\n"; echo 'myclass::$value = ' . myclass::$value . "\n"; >

In a table definition, it is a table-level constraint. Unlike CHECK constraints applied to domain definitions, its VALUE element is expressed as a column reference. For example, on a domain, a CHECK clause might be

CHECK (VALUE > 10)

The ApplicationActivation attribute is included to set the activation type to Server. Since library components are activated within the caller s process, JIT activation only makes sense when used with Server activation. Clearly, the AddNumber and GetTotal methods are not stateless. They rely upon the state of a member variable (m_Number). We should be able to observe a difference in the results between the JIT and non-JIT classes.

CHECK (ACOLUMN > 10)

The first part of the code works as in the previous example, but when you try to access the private member, the script will stop with a fatal error. myclass::MYCONST = 123 Fatal error: Cannot access private property myclass::$value in /Samples/10-5-9.php on line 9

A CHECK constraint is active in both INSERT and UPDATE operations. Although it is a table-level constraint, its scope can range from column level, through row level and, although it is not recommended, to table level and even beyond the boundaries of the table. It guarantees data integrity only when the values being verified are in the same row as the value being checked.

in different rows of the same table or in different tables, since any row other than the current one is potentially in the process of being altered or deleted by another transaction. Especially, do not rely on a CHECK constraint to enforce a referential relationship!

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