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The concept of consistency is a little more difficult than atomicity The consistency feature states that every transaction should leave the database in a valid state The tricky part here is what is considered a valid state For most simple databases, this is not an issue Transactions that update or modify simple tables are usually not a problem Often this feature is used when advanced rules or triggers are present in a database for defining how data is stored (we will talk more about these in the Rules and Triggers sections later in this chapter) For now, it is sufficient to know that rules and triggers are internal database functions that occur based on a specific activity on data in a table Developers create triggers to ensure that data is entered into the database correctly, such as ensuring that each record in the Customer table contains a valid phone number If a customer record is added to the Customer table without a phone number entry, a trigger can cause the record to be rejected by the DBMS Consistency states that all rules and triggers are applied properly to a transaction If any rule or trigger fails, the transaction is not committed to the database For our example, if a store clerk attempts to add a new customer record without a phone number, the trigger would prevent the record from being added, causing the transaction to fail, thus preserving the integrity of the customer record Consistency can also be applied to multiple tables For example, a developer can create a rule for the Order table that automatically updates a Billing table with the cost of a customer s order What would happen if an order was inserted into the Order table, but the database system crashed before the rule could update the Billing table Free products are good for customers, but a bad way to do business for the store To meet the ACID consistency test, an entry into the Order table should not be made until it is certain that the database rule creating an entry in the Billing table was completed This ensures that the data in the two tables remains consistent.

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For the most part, Windows users rely on the graphical hierarchy in Windows Explorer to deal with files However, on occasion, you may be asked to confirm or create a path presented in text format Just remember, the folders in a path are separated by a backslash (\), not a forward slash (/)

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that errors could result Switching to the 1024 levels provided by the readadc10 command greatly simplified the task The resistor values that I finally chose are presented in Figure 11-2 Each of the 16 key positions includes two pieces of relevant data: the total resistance that is connected in series with the 10k base resistor when the corresponding key is pressed, and (in parentheses) the resulting value produced by the readadc10 command If you are unsure about the formula to use to compute the ADC values, refer back to our discussion in 6 Finally, I need to emphasize that these are theoretical results; your specific ADC values will almost certainly be somewhat different We ll confront that issue in the next section when we actually construct and test our breadboard circuit Constructing a Breadboard Circuit to Interface a Matrix Keypad The schematic for our breadboard circuit is presented in Figure 11-3 As you can see, the eight connections to the keyboard that I am using are not logically ordered, but it really doesn t matter much The important thing is to make sure that the connections for each resistor are the same as the ones presented earlier in Figure 11-2 If the pin-out is different for the keypad you intend to use, simply rearrange the connections appropriately The parts list for our breadboard circuit is again too simple to warrant a table; just a matrix keypad with a male header, the seven resistors shown in the schematic, and an 08M2 processor My breadboard layout is shown in Figure 11-4 You can see that the location of the keypad header is somewhat inconvenient for a breadboard circuit; it would be better if the header were at the top of the keypad so that it could connect near the bottom edge of the breadboard and therefore be closer to the user However, when we get to our stripboard project, the reverse will be true having the.

Figure 6-4

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