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in the ANSI/ISO model, all changes made to the database during the transaction become permanent. However, a new transaction is not automatically started. The SAVE TRANSACTION statement establishes a savepoint in the middle of a transaction. Sybase saves the state of the database at the current point in the transaction and assigns the saved state a savepoint name, specified in the statement. The ROLLBACK TRANSACTION statement has two roles. If a savepoint is named in the ROLLBACK statement, Sybase backs out the database changes made since the savepoint, effectively rolling the transaction back to the point where the SAVE TRANSACTION statement was executed. If no savepoint is named, the ROLLBACK statement backs out all database changes made since the BEGIN TRANSACTION statement. The Sybase savepoint mechanism is especially useful in complex transactions involving many statements, as shown in Figure 12-4. The application program in the figure periodically saves its status as the transaction progresses, establishing two named savepoints. If problems develop later during the transaction, the application program does not have to abort the entire transaction. Instead, it can roll the transaction back to any of its savepoints and proceed from there. All of the statements executed before the savepoint remain in effect; those executed since the savepoint are backed out by the rollback operation.

This function returns the length of a string in characters. The input parameter can be any kind of string expression. DATALENGTH, a similar system function, returns the number of bytes occupied by the value.

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declare @chvEquipment varchar(30) set @chvEquipment = 'Toshiba Portege 7020CT' select Len(@chvEquipment)

5:

Next, you will need to connect the motion module to the Tele/Page-Alert controller. The motion module should be plugged into the 10-pin female header on the main Tele/PageAlert board. On the Tele/Page-Alert board, the first header next to the screw terminals is the 15-pin header, which is used for the listen-in board, while the second header is a 10pin one, which is used for the motion module board. The motion module board is plugged into the Tele/Page-Alert, with the components from both boards facing each other. Once the two boards are fastened together, you will need to place a hole in the Tele/Page-Alert enclosure to allow the PIR to see the room. You will at this point have to place the Fresnel lens ahead of the PIR sensor before securing the top of the Tele/Page-Alert enclosure. Table 22-2 is the motion module pinout chart. The PIR sensor requires a Fresnel beam focusing lens. The Fresnel lens is placed ahead of the PIR sensor to give the sensor a specific pattern of coverage. PIR Fresnel lenses come in two basic types. The most common beam pattern is the wide-angle lens which looks out to about 12 ft with a 30 to 50 beam pattern; the second Fresnel lens is the narrow-angle type which looks out to about 50 ft with a narrow beam pattern. Your Tele-Alert or Page-Alert is now a complete motion detector alarm controller/dialer that can be used to protect a house, cottage, or workshop area. If you are clever in the placement of the PIR sensor, you can easily protect large areas. Note that you can also connect other alarm detectors or sensor switches to the three additional Tele/Page-Alert input channels (2 through 4) all at the same time.

Note that the entire transaction is still the logical unit of work for Sybase, as it is for the ANSI/ISO model. If a system or hardware failure occurs in the middle of a transaction, for example, the entire transaction is backed out of the database. Thus, savepoints are a convenience for the application program, but not a fundamental change to the ANSI/ISO transaction model. The explicit use of a BEGIN TRANSACTION statement is, however, a significant departure from the ANSI/ISO model. SQL statements that are executed "outside a transaction" (that is, statements that do not appear between a BEGIN/COMMIT or a BEGIN/ROLLBACK statement pair) are effectively handled in "auto-commit" mode. Each statement is committed as it is executed; there is no way to roll back the statement once it has succeeded. Some DBMS brands that use a Sybase-style transaction model prohibit statements that alter the structure of a database or its security from occurring within a transaction (such as CREATE TABLE, ALTER TABLE, and DROP TABLE, discussed in 13, and GRANT

Figure 5-2.

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The following two functions return the number of characters from the left or right side of the string: LEFT(character_expression, integer_expression) RIGHT(character_expression, integer_expression) Earlier versions of Microsoft SQL Server contained only the RIGHT function.