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Note Applying a PRIMARY KEY constraint on a field also generates a unique index by default. Indexes are objects that improve the performance of many database operations, speeding up your web application (you ll learn more about indexes a bit later).

It is a blessing because the code is telling you that something went wrong But it is a curse because sometimes you know something could go wrong, and that it is OK, but you don t want the exception to travel up the program hierarchy In these cases, you need to catch the exception, which makes your code more complicated For example, say you wanted to parse a number The NET parsing routines tend to give a result if everything worked OK, but generate an exception if things are not OK There is no return value, nor out parameter, just an exception But when parsing a number, you do know that things could go wrong, so you will need to write an exception handler Following is some source code that parses a number..

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Constraints are rules that apply to data tables and make up part of the data integrity rules of the database. The database takes care of its own integrity and makes sure these rules aren t broken. If, for example, you try to add two identical values for a column that has a PRIMARY KEY constraint, the database refuses the operation and generates an error. We ll do some experiments later in this chapter to show this.

int TestGetValue(string buffer) { int retval = 0; try { retval = intParse(buffer); } catch (FormatException ex) { ConsoleWriteLine("Exception (" + exMessage + ")"); } return retval; } In the example, the code realizes that if Parse() is called and the string cannot be converted into a number due to incorrect letters or numbers, an exception will be thrown The exception will be caught, processed (using the exception s Message property to obtain the problem), and then the value of retval will be returned to the caller But what if an exception does happen The variable retval is initialized to a default value of 0, which is a valid formatted number and can be interpreted as the result of a successful format processing The problem in the code is that a developer is caught in a bind.

Note A primary key is not a column but a constraint that applies to that column; however, from now

First, use Solver to forecast the minimum yearly precipitation total for Seattle. Assume a yearly precipitation total target of 40 inches; no monthly precipitation total of less than 2 inches; and no less than 5 inches in January, February, November, or December. 1. Click Tools Solver. 2. Click Reset All, and then click OK. 3. Click the Set Target cell box, and then click or type cell O24. 4. Click the Value Of option. In the Value Of box, type 40. 5. Click the By Changing Cells box, and then select cells C24 through N24. 6. Click Add. 7. Click the Cell Reference box, and then select cells C24 through N24. 8. In the operator box, select >=. 9. Click the Constraint box, and then type 2. 10. Click Add. 11. Click the Cell Reference box, and then select cells C24 and D24. 12. In the operator box, select >=. 13. Click the Constraint box, and then type 5. 14. Click Add. 15. Click the Cell Reference box, and then select cells M24 and N24. 16. In the operator box, select >=. 17. Click the Constraint box, and then type 5. 18. Click OK. Your Solver Parameters dialog box should look like Figure 4-28.

By capturing the exception, the method TestGetValue() is saying, I will always return to the caller a valid value Yet there are instances when a valid value is not available In the case of parsing a number, an exception is thrown So by capturing an exception, you are doing the completely wrong thing, because you should be letting the exception be caught by a higher-level caller But things can become sticky here Do you really want to inform the caller that a parse cannot occur Perhaps the caller is more interested in whether a valid value is returned It s like saying to the CEO, Oops, we just ran out of staples.

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