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Firebird stores the constraint FK_CHILD_PARENT and creates an ordinary index on the column(s) named in the FOREIGN KEY argument. In Firebird 1.5, the index will be named FK_CHILD_PARENT as well, unless you used the optional USING clause to assign a different name to the index. In Firebird 1.0.x, the index name will be INTEG_nn (where nn is a number).

unique constraint, you must be sure to specify USING DESC INDEX for any foreign keys that reference it.

The two tables are now engaged in a formal referential integrity constraint. We can add new rows to PARENT without restriction:

< php // Example 10-9-1.php if (!extension_loaded("shmop")) { dl("php_shmop.dll"); } $shm_id = shmop_open(0x123, 'c', 0644, 250); shmop_write($shm_id, "Data in shared memory", 0); $value = shmop_read($shm_id, 8, 6); echo "$value"; shmop_delete($shm_id); shmop_close($shm_id); sleep(60); >

INSERT INTO PARENT (ID, DATA) VALUES (1, 'Parent No. 1');

Is it possible to use COM+ role-based security with managed components How do you apply this type of security to your classes

However, there are restrictions on CHILD. We can do this:

INSERT INTO CHILD (ID, CHILD_DATA) VALUES (1, 'Child No. 1');

If the memory block should be used by another process, it should not be deleted, and another process could access the data, like this: < php // Example 10-9-2.php if (!extension_loaded("shmop")) { dl("php_shmop.dll"); } $shm_id = shmop_open(0x123, 'a', 0, 0); if ($shm_id) { $value = shmop_read($shm_id, 0, 100); echo "$value"; shmop_close($shm_id); } >

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Because the nullable column PARENT_ID was omitted from the column list, NULL is stored there. This is allowed under the default integrity rules. The row is an orphan. However, we get a constraint error if we try to do this:

INSERT INTO CHILD(ID, CHILD_DATA, PARENT_ID) VALUES (2, 'Child No. 2', 2); ISC ERROR CODE:335544466 ISC ERROR MESSAGE: violation of FOREIGN KEY constraint "FK_CHILD_PARENT" on table "CHILD"

Components developed in .NET can use COM+ role-based security. Most of the work necessary to use COM+ security takes the form of adding attributes to your managed code. There are assembly-, class-, and method-level attributes that you apply to control how role-based security affects your components.

There is no row in PARENT having a PK value of 2, so the constraint disallows the insert. Both of the following are allowed:

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UPDATE CHILD SET PARENT_ID = 1 WHERE ID = 1; COMMIT; /**/ INSERT INTO CHILD (ID, CHILD_DATA, PARENT_ID) VALUES (2, 'Child No.2', 1); COMMIT;

Now, the PARENT row with ID=1 has two child rows. This is the classic masterdetail structure an uncomplicated implementation of the one-to-many relationship. To protect the integrity of the relationship, the default rules will disallow this:

DELETE FROM PARENT WHERE ID = 1;

Note COM+ role-based security is the predecessor of the .NET role-based security. Although many of the

Printing and storing information during development and testing will help eliminate errors caused by variables having other values than expected or by using the wrong variable names. PHP implements several functions that make debugging a lot easier (see Table 10-9). Table 10-9. Functions Used for Debugging

Obviously, integrity rules take effect whenever some change in data occurs that affects the relationship. However, the default rules do not suit every requirement. We may want to override the rule that permits child rows to be created as orphans or to be made orphans by having their foreign key set to null in an operation. If it is a problem

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for our business rules that a parent row cannot be deleted if it has dependent child rows, we may want Firebird to take care of the problem automatically. Firebird s SQL language can oblige, through its optional automatic action triggers:

echo() print() printf() var_dump() print_r() debug_backtrace()

[ON DELETE {NO ACTION | CASCADE | SET NULL [ON UPDATE {NO ACTION | CASCADE | SET NULL | SET DEFAULT}] | SET DEFAULT}]

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