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tables and columns. Table 5-2 lists the keywords included in the ANSI/ISO SQL2 standard, which roughly tripled the number of keywords reserved by the earlier SQL1 standard. The SQL2 standard also includes a list of "potential keywords" that are candidates for becoming keywords in future revisions of the standard. These keywords are listed in Table 5-3. Table 5-2: ANSI/ISO SQL2 Keywords

Execution in a Test Environment To debug or test a stored procedure, I execute the stored procedure from Query Analyzer with the @debug parameter set to 1.

In order to turn the BS2 look-alike into a Data-Term project, a few more parts must be added to the basic configuration Table 23-3 lists the BS2 pinouts First, you need to configure pins 10 through 13 as user inputs Momentary pushbutton switches S1 to S4 are used for future activation of Data-Term functions, such as display scrolling and manual control A resistor is placed across each input line to 5 V Additionally, pins 18, 8, and 28 are con figured as inputs Pin 18 is used for ringer detect, while pins 8 and 28 are used for serial communication inputs The Data-Term project has many pins that are used for outputs Pins 16 and 17 are outputs configured to animate the modem, while pin 19 is used to connect the phone line Pins 20 and 21 are used to send X10 information to the power line controller.

declare @chvResult varchar(8000) exec prGetInventoryProperties @intInventoryId = 5, @chvProperties = @chvResult OUTPUT, @debug = 1 select @chvResult Result

CURRENT_TIMESTAMP GRANT CURRENT_USER CURSOR DATE DAY DEALLOCATE DEC DECIMAL DECLARE GROUP HAVING HOUR IDENTITY IMMEDIATE IN INDICATOR INITIALLY INNER INPUT

Naturally, you can pass parameters either by name or by position. The result of the execution will be an elaborate printout like the one shown in Figure 7-6. Execution in the Production Environment In production, the stored procedure is called without a reference to the @debug parameter. Here, SQL Server assigns a default value to the parameter (0), and the stored procedure is executed without debug statements.

Pin 22 drives the LCD display, while pin 23 controls the buzzer Pin 24 is used to light the status LED, and pin 25 is free for future use Pin 9 of U7 is used for serial communication output The 2-kbyte external memory chip at U6 is coupled to the microprocessor via pins 6 and 7 A 20-MHz reference crystal is connected across pins 27 and 28 of the processor Power for the processor is a regulated 5-V supply provided by U1 A 9- to 12-V wall wart power supply can be used to power the regulator input Five-volt power is supplied to pin 2 of U7, while ground is applied to pins 1 and 4 A microprocessor reset is furnished between pin 28 and ground The microprocessor communicates serially via U8, a MAX-232 chip The MAX-232 requires only four 1- F capacitors to operate.

7:

Figure 7-6.

OCTET_LENGTH SQLSTATE OF ON ONLY OPEN OPTION OR ORDER OUTER OUTPUT OVERLAPS PAD PARTIAL POSITION PRECISION PREPARE PRESERVE PRIMARY SUBSTRING SUM SYSTEM_USER TABLE TEMPORARY THEN TIME TIMESTAMP TIMEZONE_HOUR TIMEZONE_MINUTE TO TRAILING TRANSACTION TRANSLATE TRANSLATION TRIM TRUE

Nested Stored Procedures Two tricks can help you debug a set of nested stored procedures (that is, when a stored procedure calls another stored procedure). It is a useful practice to display the name of the stored procedure at the beginning and end of the stored procedure.

The output of the MAX-232 requires a diode D5 and resistor R15 to interface to your personal computer in order to download the software..

declare @chvProcedure sysname set @chvProcedure = 'prGetInventoryProperties_2' if @debug <> 0 select '**** '+ @chvProcedure + 'START ****' ... if @debug <> 0 select '**** '+ @chvProcedure + 'END ****' return 0

AUTHORIZATION DEFAULT AVG BEGIN BETWEEN BIT BIT_LENGTH BOTH BY CASCADE DEFERRABLE DEFERRED DELETE DESC DESCRIBE DESCRIPTOR DIAGNOSTICS DISCONNECT

When you call a nested stored procedure, you need to pass the value of the @debug parameter to it as well. In this way, you will be able to see its debugging information.

XTAL Osc and clock divider Energy detect Mode control logic RX filter and equalizer VBIAS XMIT buffer and output buffer FSK demodulator RX/TX Data Re-timing

You should keep the following issues in mind when you are writing your code and testing Transact-SQL programs:

NULLS Assignment of variable from resultset No records affected Wrong size or datatype Default length Rollback of triggers Warnings and lower-priority errors Nested comments Deferred name resolution Cursors Overconfidence

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