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CREATE TABLE PARENT_CHILD ( ID INTEGER NOT NULL, PARENT_ID INTEGER CHECK (PARENT_ID <> ID)); COMMIT; ALTER TABLE PARENT_CHILD ADD CONSTRAINT PK_PARENT PRIMARY KEY(ID); COMMIT; ALTER TABLE PARENT_CHILD ADD CONSTRAINT FK_CHILD_PARENT FOREIGN KEY(PARENT_ID) REFERENCES PARENT_CHILD(ID);

Hello World!

Much more can be said about designing tree structures. It is a challenging topic in relational database design that stretches standard SQL to its boundaries. Unfortunately, it is beyond the scope of this guide. For some interesting solutions, try Joe Celko s SQL for Smarties, 2nd Edition by Joe Celko (Morgan Kaufmann, 1999).

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namespace DniScRoleSecurity { public interface IRoleMethodSecurity { int SecuredMethod(string paramA); int UnsecuredMethod(string paramA); } [ComponentAccessControl(true)] [SecureMethod] [ClassInterface(ClassInterfaceType.None)] public class DniScRoleMethodSecurityObj : ServicedComponent, IRoleMethodSecurity { [SecurityRole("AppManager")] public int SecuredMethod(string paramA) { return paramA.Length; } [SecurityRole("AppUser", true)] public int UnsecuredMethod(string paramA) { return paramA.Length; } } } Just as we did with the last example, we apply the ComponentAccessControl and SecureMethod attributes to the class. However, this time we apply the SecurityRole attribute to each method. As shown in this example, doing so allows us to assign a different role to each method.

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A mandatory, or obligatory, relationship is one that requires that a minimum of one referencing (child) row exist for each referenced (parent) row. For example, a delivery note structure (a header with customer and delivery address information) would be illogical if it were permitted to have a header row without any referencing item lines. It is a common beginner mistake to assume that a NOT NULL constraint on the child will make a one-to-many relationship mandatory. It does not, because the FOREIGN KEY constraint operates only in the context of an instantiated dependency. With no referencing row, the nullability of the foreign key is irrelevant to the issue. A mandatory relationship is one place where user-defined trigger constraints must be added to extend referential integrity. Firebird SQL does not provide a mandatoriness constraint. It can take some fancy logic at both the client and the server to ensure that events will occur in the right sequence to meet both the referential constraint and the mandatoriness requirements. It will involve both insert and delete triggers, since the logic must enforce the minimum of one child rule not only at creation time, but also when child rows are deleted. For details about writing triggers and an example of a trigger solution for enforcing a mandatory relationship, refer to 31.

As you can see, the major difference in the argument list is that you place an ampersand (&) character in front of the passed-in variable. This tells PHP to treat the variable as a referenced object. This means any change to the passed-in value will affect the original passed-in variable. Therefore, when you output $mystring after the function call has been made, the new value has been concatenated onto the old value. Had you passed in the argument by value, the script would have merely output Hello because it would have treated the value as a copy of the original, not as an alias to the original.

It is worth mentioning this exception in the context of applying referential integrity constraints, since it is a regular source of frustration for new users. Firebird will not allow a referential constraint to be added or dropped if a transaction is using either of the participating tables. Sometimes it may be less than obvious to you just in what way the object is in use. Other dependencies such as stored procedures or triggers that refer to your tables, or other referential constraints affecting one or both can cause this exception to occur if they are in use by an uncommitted transaction. Metadata caches (blocks of server memory that hold metadata used to compile recent client requests and any recently used stored procedure and trigger code) keep locks on the objects in their possession. Each connection has its own metadata cache, even on a Superserver, so the server could be holding locks on objects that no connection is actually using. It is highly recommended that you get exclusive access to the database for any metadata changes, particularly those involving dependencies.

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