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When an RDBMS provides the ability to declare the relationship between two tables, it is sometimes termed declarative referential integrity, a fuzzy term that seems to have been propagated by writers of magazine articles. Referential integrity is a design objective, a quality. The author prefers the term formal referential constraints when referring to the mechanisms for implementing the rules. In a relational database management system (RDBMS), relationships between two tables are created by means of the foreign key constraint. The foreign key constraint enforces the rules of existence for the rows it represents, protecting the table against attempts to store rows that are inconsistent with the data model. However, this constraint does not need to work alone. Other integrity constraints (described in detail in the previous chapter) can work in combination with the referential constraint to protect the consistency of relationships.

A foreign key is a column or set of columns in one table that corresponds in exact order to a column or set of columns defined as a PRIMARY KEY or a UNIQUE constraint in another table. In its simplest form, it implements an optional one-to-many relationship.

Note Using shared memory requires that the processes are persistent such as Apache modules, IIS ISAPI,

Note When working to resolve a problem, it is often helpful to directly step into the code with a debugger.

An optional relationship exists when the relationship is made possible by the formal structure but is not required. That is to say, a parent instance may exist without any referencing child but, if both exist, both are constrained. The other side of the coin is a mandatory relationship. Mandatory relationships are discussed later in this chapter.

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The standard entity-relationship model depicts a simple one-to-many relationship between two entities as shown in Figure 17-1.

If we implement this model as two tables, PARENT and CHILD, then rows in the CHILD table are dependent on the existence of a linking row in PARENT. Firebird s FOREIGN KEY (FK) constraint enforces this relationship in the following ways: It requires that the value presented in the FK column of the referencing table, CHILD (CHILD.PARENT_ID), must be able to be linked to a matching value present in the referenced unique key (in this case, the primary key) of PARENT (PARENT.ID). By default, it disallows a row in PARENT to be deleted, or to have its linking unique key value changed to a different value, if dependent CHILD rows exist. It must implement the relationship that was intended at the time the reference was created or the last time it was updated.2 By default, it allows the FK column to be null. Since it is impossible to link null to anything, such child rows are orphans they have no parent.

The shmop extension implements six simple functions, as shown in Table 10-8.

In order to implement the referential constraint, certain prerequisites must be attended to. In this section, we follow through a very simple example. If you are developing in an existing, complex environment, where SQL privileges are in effect, then you may need to be concerned about the REFERENCE privilege. It is introduced in a separate section later in this chapter.

The Visual Studio debugger allows you to start debugging in your managed code and step directly into unmanaged functions, viewing the values of any parameters and watching as unmanaged code is executed. To enable unmanaged debugging, you need to set the Enable Unmanaged Debugging project property to true. This is a property of the managed project and can be found on the Debugging page of the project properties. If you don t check this check box, you will step over any unmanaged calls, rather than being able to step into them.

It is necessary to start with the parent table and implement a controlling unique key to which the dependent table will link. This is commonly the primary key of the parent table, although it need not be. A foreign key can link to a column or group that has been constrained using the UNIQUE constraint. For present purposes, we will use the primary key:

CREATE TABLE PARENT ( ID BIGINT NOT NULL, DATA VARCHAR(20), CONSTRAINT PK_PARENT PRIMARY KEY(ID)); COMMIT;

shmop_open() shmop_close() shmop_delete() shmop_read() shmop_write() shmop_size()

2. A thoughtful inclusion in Data Modeling Essentials, 2nd Edition by Graeme Simsion (Coriolis,

2000).

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