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As modeled, this relationship gives rise to a condition known as a circular reference. The proposed foreign key in TableB references the primary key of TableA, which means that the TableB row cannot be created if there is no row in TableA with a matching primary key. However, for the same reason, the required row cannot be inserted into TableA if there is no matching primary key value in TableB.

If your structural requirements dictate that such a circular reference must exist, it can be worked around. Firebird allows a foreign key value to be NULL provided the column is not made non-nullable by another constraint because NULL, being a non-value, does not violate the rule that the foreign key column must have a matching value in the referenced parent column. By making the FK on one table nullable, you can insert into that table and create the primary key that the other table requires:

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This chapter demonstrated the strengths of PHP when it comes to variables and data types. The loosely typed behavior of PHP makes it easy to work with, and there is little reason to spend time on memory cleanups, as the engine handles these when the scripts terminate. We discussed how variables are handled from creation, and we discussed how to manipulate data, how to test for values and types, and how to use the more advanced features of variable variables and functions. We also showed examples of using the serialize() and unserialize() functions to format data so the data can be shared between calls or stored in a database. Finally, we showed some examples of how data can be shared between processes that run simultaneously.

CREATE TABLE ID INTEGER ..., CONSTRAINT COMMIT; CREATE TABLE ID INTEGER TABLEA ( NOT NULL, PK_TABLEA PRIMARY KEY (ID)); TABLEB ( NOT NULL,

Note The use of the SecurityRole attribute is completely optional at the assembly level. If you opt to

Referential Integrity ..., CONSTRAINT PK_TABLEB PRIMARY KEY (ID)); COMMIT; ALTER TABLE TABLEA ADD CONSTRAINT FK_TABLEA_TABLEB FOREIGN KEY(IDB) REFERENCES TABLEB(ID); COMMIT; ALTER TABLE TABLEB ADD CONSTRAINT FK_TABLEB_TABLEA FOREIGN KEY(IDA) REFERENCES TABLEA(ID); COMMIT;

This is the workaround:

INSERT INTO TABLEB(ID) VALUES(1); /* creates a row with NULL in IDB */ COMMIT; INSERT INTO TABLEA(ID, IDB) VALUES(22, 1); /* links to the TABLEB row just created */ COMMIT; UPDATE TABLEB SET IDA = 22 WHERE ID = 1; COMMIT;

edundant code is rarely a good thing. Rewriting code over and over again is not time efficient and looks rather shoddy from a layout point of view. Like any good programming language, PHP alleviates the problem of redundant code in a number of ways; the most commonly used and simple-to-implement way is by using functions. A function is basically a block of code that performs a given action from the script that has access to it, via includes, code insertions, or other methods. Rather than repeatedly rewrite the same block of code to, say, check if the current user is logged into your site, you can put the code into what is essentially a code wrapper and then call it at your convenience with a simple function call. To be truly versatile, functions can receive values passed into them, perform some sort of functionality, and then return a value (or set of values using an array or object). Taking an entire block of code that was redundantly placed all over your scripts and replacing it with a one-line function call does wonders for the cleanliness of your code and is the first step to becoming an efficient programmer.

Clearly, this model is not without potential problems. In most systems, keys are generated, not supplied by applications. To ensure consistency, it becomes a job for all client applications inserting to these tables to know the value of both keys in both tables within a single transaction context. Performing the entire operation with a stored procedure would reduce the dependence of the relationship on application code.

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