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Optional one-to-one structures can be valuable where an entity in your data model has a large number of distinct attributes, only some of which are accessed frequently. It can save storage and page reads dramatically to store occasional data in optional peer relations that share matching primary keys. A one-to-one relationship is similar to a one-to-many relationship, insofar as it links a foreign key to a unique key. The difference here is that the linking key needs to be unique to enforce the one-to-one relationship to allow, at most, one dependent row per parent row. It is usual to double up the use the primary key column(s) of the peer table as the foreign key to the parent.

Note Role names are not the same thing as system or domain group names. Roles exist only within the

CREATE TABLE PARENT_PEER ( ID INTEGER NOT NULL, MORE_DATA VARCHAR(10), CONSTRAINT PK_PARENT_PEER PRIMARY KEY(ID), CONSTRAINT FK_PARENT_PEER_PARENT FOREIGN KEY (ID) REFERENCES PARENT);

The effect of this double usage is to cause two mandatory indexes to be created on the primary key column of the peer table: one for the primary key and one for the foreign key. The FK index is stored as if it were non-unique. In versions 1.0.x and 1.5, the optimizer is quirky about this doubling up and ignores the peer table s primary index. For example,

> < php // Example 10-10-2.php include 'debug1.inc'; $a = array('orange', 'apple'); debug_print($a, __FILE__, __LINE__); >

SELECT PARENT.ID, PARENT_PEER.ID, PARENT.DATA, PARENT_PEER.MORE_DATA FROM PARENT JOIN PARENT_PEER ON PARENT.ID = PARENT_PEER.ID;

ignores the primary key index of the peer and produces this plan:

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scope of a single COM+ application. When assigning users to a role, you can assign one of the system user groups or an individual user. To avoid confusion, the example role names are prefixed with App. This makes it clear that AppAdministrator is not the same thing as the Administrator user, for example.

PLAN JOIN (PARENT_PEER NATURAL, PARENT INDEX (PK_PARENT))

In this example, you add two parameters to the debug_print() function. As shown in the following output, the debug_print() function can produce two forms of output. The first call to the function uses the default values for $file and $line. This causes the system to insert the name of the include file and the line where the function is defined. In the second call, you use __FILE__ and __LINE_ as parameters to the function call, and these will be replaced with the filename and line number where the function was called. File = /Samples/debug1.inc (5) array(2) { [0]=> string(6) "orange" [1]=> string(5) "apple" } File = /Samples/10-10-2.php (7) array(2) { [0]=> string(6) "orange" [1]=> string(5) "apple" } Note how the two magic constants are used as default values for $file and $line in the definition of the function. If one or both of these two arguments are omitted from the call, they will be replaced by values that indicate the include file and the line where the function is defined.

With a thin key, such as the one used in the example, the impact on performance may not be severe. With a composite key, the effect may be serious, especially if there will be multiple joins involving several parent-to-peer one-to-one relations. It should at least make you consider surrogating the primary keys of one-to-one structures.4

17

It is not a bad thing if you choose to add a special column to a peer relation in order to implement distinct primary and foreign keys. It can be a useful aid to self-documentation.

Note the alternate constructor used for the AppUser role: [assembly: SecurityRole("AppUser", true)] The second parameter (true) indicates that the role should be prepopulated with the Everyone system group. You would normally do this for roles that represent the lowest possible security level. This allows all users of the system to have access to classes or methods with the AppUser role.

Summary

In this interesting case shown in Figure 17-2, our data model shows us that each row in TableA may have relationships with multiple rows in TableB, while each row in TableB may have multiple relationships with rows in TableA.

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