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As you can probably tell from the bold text, this trigger executes immediately after an INSERT statement executes against the OrderItem table. In this case, the trigger subtracts the quantity ordered from the AvailableToSell column of the InventoryItem table. No matter what ColdFusion template, Excel macro, Visual Basic module, or Query Analyzer batch inserts rows into the OrderItem table, this trigger code executes automatically after the INSERT statement concludes. This is an important design consideration and a best practice for designing multitiered systems such as ColdFusion applications. By placing critical business logic in a trigger, you never need to worry about whether every client application accessing your database server executes the code necessary to preserve your business rules. If you didn t place this code in a trigger, for example, but instead relied on your ColdFusion application code to perform this same database operation, you would be at constant risk of forgetting to duplicate this code everywhere that an INSERT is performed against the OrderItem table. To make things even worst, consider things outside your realm, such as Visual Basic applications or even the occasional DBA (database administrator) working in an SQL batch utility. So how can you ensure that your business rules are preserved everywhere and that InventoryItem.AvailableToSell is always updated in tandem with inserts into OrderItem.Quantity You can t unless you put that code in an Insert Trigger on the InventoryItem table.

A trigger is considered an integral part of the underlying SQL statement that triggers it. If the SQL statement fails, the trigger must not execute, because the triggering event never really happened. Similarly, if the trigger code fails to complete execution for any reason, both the trigger and the SQL statement that triggered it must be rolled back. Because the trigger is considered part of the underlying SQL statement that triggers it, the entire set of statements didn t complete execution, so everything must be rolled back as if nothing ever happened.

There s a list of Beatles tracks that respond well to OOPS effects at www.beatletracks .com/btoops.html. The tracks listed respond well to other techniques in this chapter as well.

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In other words, a trigger and the SQL statement that triggers it are parts of an implicit transaction, meaning that both the SQL statement and the trigger must successfully execute or both are rolled back Remember that a transaction is a single unit of work: If all the instructions inside a transaction execute flawlessly, the transaction succeeds; if any single instruction inside a transaction fails, all the instructions inside the transaction are rolled back, and the entire transaction fails This transaction is called an implicit transaction because the fact that it is a transaction is implied by its very nature rather than it being explicitly declared as a transaction by programming statements to that effect Now take a look at why both a trigger and the statement that triggers it must be part of the same transaction.

termed the Debye-Hilckel limiting law. Coefficient A has the numerical value A = 5.77057 x 10 4 (Dr)" 3/2 = 1.82481 x 10\DT)-3/2 and, for water at 25 C, A = 1.61039 x 10"2 m3/2 mol" m = 0.50925 dm 3/2 -mor 1/2 In these expressions, the first value is valid for basic SI units and the second for / in moles per cubic decimetre substituted into Eq. (1.3.24). Equation (1.3.24) is a very rough approximation and does not involve the individual characteristics of ion k. It is valid for a uni-univalent electrolyte only up to an ionic strength of 10~3 mol dm" 3 (see also Fig. 1.8). In view of the definition of the mean activity coefficient and of the electroneutrality condition, v+z+= v_z_, the limiting law also has the form logy =^z + z_V7 (1.3.25) m3/2 moP 1/2 dm3/2 mol"1/2

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