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. . . confirm the change one last time with the customer . . . COMMIT WORK Here is the same transaction, but this time assume that the user makes an error entering the product number. To correct the error, the transaction is rolled back, so that it can be reentered correctly: Change the quantity on order number 113051 from 4 to 10, which raises its amount from $1,458 to $3,550. The order is for QAS-XK47 Reducers and was placed with Larry Fitch (employee number 108), who works in Los Angeles (office number 21). UPDATE ORDERS SET QTY = 10, AMOUNT = 3550.00 WHERE ORDER_NR = 113051 UPDATE SALESREPS SET SALES = SALES - 1458.00 + 3550.00 WHERE EMPL_NUM = 108 UPDATE OFFICES SET SALES = SALES - 1458.00 + 3550.00 WHERE OFFICE = 21 UPDATE PRODUCTS SET QTY_ON_HAND = QTY_ON_HAND + 4 - 10 WHERE MFR_ID = 'QAS' AND PRODUCT_ID = 'XK47' . . . oops! the manufacturer is "QSA", not "QAS" . . . ROLLBACK WORK

These functions require expressions of the datetime or smalldatetime datatype, and they all return the corresponding integer value. The DATEPART and DATENAME functions provide similar functionality, but they are more flexible:

DATEPART(datepart, date) DATENAME(datepart, date)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

The user can specify which component of the date to obtain by supplying a datepart constant from Table 5-2 (you can use either the full name or the abbreviation).

The ANSI/ISO SQL standard defines a SQL transaction model and the roles of the COMMIT and ROLLBACK statements. Most, but not all, commercial SQL products use this transaction model, which is based on the transaction support in the early releases of DB2. The standard specifies that a SQL transaction automatically begins with the first SQL statement executed by a user or a program. The transaction continues through subsequent SQL statements until it ends in one of four ways: A COMMIT statement ends the transaction successfully, making its database changes permanent. A new transaction begins immediately after the COMMIT statement. A ROLLBACK statement aborts the transaction, backing out its database changes. A new transaction begins immediately after the ROLLBACK statement. Successful program termination (for programmatic SQL) also ends the transaction successfully, just as if a COMMIT statement had been executed. Because the program is finished, there is no new transaction to begin. Abnormal program termination (for programmatic SQL) also aborts the transaction, just as if a ROLLBACK statement had been executed. Because the program is finished, there is no new transaction to begin.

Millisecond Second Minute Hour weekday Week dayofyear Day Month Quarter Year Table 5-2.

Vcc Sensitivity adjust Offset filter Antialias DC capacitor Vreg Pyrosensor (D) Pyrosensor (S) Ground (A) Ground (D) Daylight adjust Daylight sense Gain select On/auto/off Toggle Out LED C R Fref

DATEPART will then return the index value of the datepart, and DATENAME will return the string that contains the appropriate name. Naturally, DATENAME is not meaningful in some cases (for example, year, second) and SQL Server will return the same number as it does for DATEPART.

- 239 -

SELECT GETDATE(), DATENAME(month, GetDate()) AS 'Month Name', DATEPART(yyyy, GetDate()) AS 'Year'

Notice that the first parameter is not a character parameter. You cannot fill it using an expression or variable. Date and Time Calculations Transact-SQL contains two functions for performing calculations on date and time expressions:

5-V supply PIR sensitivity input PIR offset filter PIR antialias filter PIR gain stabilization filter Voltage regulator output Pyro drain reference pin Pyro source input Analog ground Digital ground Daylight adjust and CDS Silicon photodiode input PIR gain Mode select state input Mode select toggle input Output Indicator LED Off timer oscillator Off timer oscillator Frequency reference oscillator

DATEADD(datepart, number, date) DATEDIFF(datepart, startdate, enddate)

Figure 12-3 shows typical transactions that illustrate these four conditions. Note that the user or program is always in a transaction under the ANSI/ISO transaction model. No explicit action is required to begin a transaction; it begins automatically with the first SQL statement or immediately after the preceding transaction ends.

DATEADD can be used to add a number of datepart intervals to a specified date value. DATEDIFF returns the number of datepart intervals between a startdate and an enddate. Both of these functions use a value from Table 5-2, shown in the previous section, to specify datepart. The following stored procedure lists due dates for the lease: