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20:

n5 =

separate DECLARE, OPEN, FETCH, and CLOSE statements for the cursor. Loop control is provided by testing the system variable @@SQLSTATUS, which is the Transact-SQL equivalent of the SQLSTATE code. It receives a value of zero when a fetch is successful, and a nonzero value when there are no more rows to fetch.

2

(5.5)

When an application program uses embedded SQL or a SQL API for database processing, the application program is responsible for handling errors that arise. Error status codes are returned to the application program, and more error information is typically available through additional API calls or access to an extended diagnostics area. When database processing takes place within a stored procedure, the procedure itself must handle errors. Transact-SQL provides error handling through a set of global system variables. The specific error-handling variables are only a few of well over 100 system variables that provide information on the state of the server, transaction state, open connections, and other database configuration and status information. The two most useful global variables for error handling are @@ERROR Contains error status of the most recently executed statement batch Contains status of the last fetch operation @@SQLSTATUS

and the thing worthy of note here is that the numbers of teeth of all gears constituting a mesh with a compounded pair are required to determine the velocity ratio through the system. Compound gear trains have an advantage over simple gear trains whenever the speed change is large. For example, if a reduction of 12/1 is required, the final gear in a simple train will have a diameter 12 times that of the first gear.

The normal completion values for both variables are zero; other values indicate various errors and warnings. The global variables can be used in the same way as local variables within a Transact-SQL procedure. Specifically, their values can be checked for branching and loop control. Oracle s PL/SQL provides a different style of error handling. The Oracle DBMS provides a set of system-defined exceptions, which are errors or warning conditions that can arise during SQL statement processing. Within an Oracle stored procedure (actually, any Oracle statement block), the EXCEPTION section tells the DBMS how it should handle any exception conditions that occur during the execution of the procedure. There are over a dozen different predefined Oracle-detected exception conditions. In addition, you can define your own exception conditions. Most of the previous examples in this chapter don t provide any real error-handling capability. Figure 20-16 shows a revised version of the Oracle stored function in Figure 20-7. This improved version detects the specific situation where the supplied customer number does not have any associated orders (that is, where the query to calculate total orders returns a NO_DATA_FOUND exception). It responds to this situation by signaling back to the application program an application-level error and associated message. Any other exception conditions that arise are caught by the WHEN OTHERS exception handler. The Informix SPL takes a similar approach to exception handling. Figure 20-17 shows the Informix version of the stored function, with Informix-style exception handling. The ON EXCEPTION statement is a declarative statement and specifies the sequence of SQL statements to be executed when a specific exception arises. A comma-separated list of exception numbers may be specified.

The disposition of the axes to be joined by the gear train often suggests the type of gear to choose. If the axes are parallel, the choices can be spur gears or helical gears. If the axes intersect, bevel gears can be used. If the axes are nonparallel and nonintersecting, then crossed helicals, worm and gear, or hypoid gears will work. In Fig. 5.3, a train having various types of gears is shown. Gears 2 and 3, parallel helical gears, have a speed ratio n3 = N2 n2 N3 (5.6)